8/8/2019 858195

1/19

WAPD-PWR-9

CT 'AT -1 1-1-GEN-14

, _ . BEPTIS PLANTPITTSBURGH, PENNSYLVANIA

Operated for the

U.S. ATO M I C E N E R G Y C O M M I S Sb y WESTINGHOUSE

ELECTRIC CORPORATION

8/8/2019 858195

2/19

UNC;LASSIFIED

PRESSURE VESSEL AND PIPING CODESAPPLICABLE TO THE PEJR REACTOR PLANT

J. F. DobinskyM. B. AndrewT. R. Moffet te

May 1957

Contract AT-11- -GX?- Ilc

Informat io n Category

A

'NAFD-BIR-974Reac to rs - Power( T I D - L S O O , 13 h Edition)

i

S dh i n t e d i n USA. Pr ice 2t? cents . Avai lable f rom th e Off ice of

Technical Services, Department of Commerce, Washington 25, D . C .

BETTIS PI.AI\JT PITTSBURGH, PA.O p r a t e d f o r t he U. S, Atomic Energy Commission by

West inghouse Electr ic Corporat ion

lhis document isCLY RELEASABLE*@fi&

AEtthofizing OGdai

UNC ASS D I E D

8/8/2019 858195

3/19

FORENARD

This document h a s been subm itte d t o t he Advisory Committee onReactor Safeguards to the Atomic Energy Commission f o r u se i n e v a lu a t i n gthe sa fe ty of the PlJR React cr P lan t ( Ship pingp ort Atomic Power St at io n) ,A s s uc h, t h i s i n f o rm a t i o n i s supp.Lemental t o t h e PWR Hazards SummapyReport , WAFD-SC -541

LEGAL NOTICE---

T hi s r e p o r t was prepared as an account of Government sponsoredwork. Nei the r the United St at es , nor th e Commission, nor any per sona c t i n g on behalf of t h e Commissiijn:

A. Makes any war ran ty o r r e p r e s e n t a t i o n , e x p r e s s or implied,wi th re sp ec t t o the accuracy, completeness , o r usefu lness of thei nf o rm a ti on c o nt a i ne d i n t h i s r e p o r t o o r t h a t t h e us e o f anyi n f or m a ti o n , a p p a r a t u s , m ethod, o r p r o ce s s d i s c l o s e d i n t h i sr e p o r t may n o t i n f r i n g e p r i v a t e l y awned r i g h t s ; o r

B. Assumes a ny l i a b i l i t i e s wi th r e sp e c t t o t he u se o f , o r f o rdamages resul t ing from the use of any in format ion , appara tus ,method, o r p r o c e s s d i s c l o s e d in t h i s r e po r te

A s used i n the above, "person ac t i ng on behalf of t h e Commission"in cl ud es any employee or, co nt ra ct or of the Commission t o the ex te nt t ha tsuch employee o r cont ra c to r p repares , hand les o r d i s t r i b u t e s , o r provides

access to , any in format ion pursuan t t o h i s employmnt o r c o n t r a c t w i t h t h eCommis s i on,

8/8/2019 858195

4/19

D i s t r i b u t i o n No, of Copies

Aberdeen Proving Ground 3Alco Products, Inc. 1 Argonne National Laboratory 10 Armed Forc es Sp ec ia l 1Jeapon Proj ec t, Washington 1 Armed Se rv ic es Techn ical I n f o r m t i o n Agency, Dayton 5

1 1

A t l a n t i c F l e e tAtomic Energy Commission, Pa te nt BranchAtomic E n o r g y Commission, Technical Library 3 Atomics In c r na t o n a l 2 Ba t t e l l e Meitlorial I ns t i tu te 2 B e t t i s P l a n t 4Br olthaven National Laboratory 4Brush Reryllium Company 1 Bureau of Medicine and Surgery 1 Bureau of Ships (Code 5 9 0 ) 1 Chicago Patent Group 1 Combustion Engi neer ing, Inc. 1 Consol idated Vultee Aircraf t Corporat ion 2 Convair-General Dynamics 1 Defence Research Member 1 Department of Food Technoloey (MIT) 1 Department of Navy (Code 1122) 2 Department of t h e A r m y , G-2 2 1Division of 'Raw Materials, Denver 1 Dow Chemical Company (Rocky Fl a t s )Du Pont de Nemours and Company, AikenDu Pont de Nemours an d Company, Wilmington 1

Frankford Arsenal 1Gen era l E l e c t r i c Company (ANPP) 2 Gene ral E l e c t r i c Company, Rich land 1 2 General Nuclear Engineering Corporation 1 Iowa State C o l l e g e 2 K i r t l a n d Air Force RaseKnolls Atomic Power Laboratory

i

4'Lockheed ALrcraft Corporation (Bauer) 2 Los Alamos S c i e n t i f i c L a b o r a t o r y 4 Mallinckrodt Chemical Works 1 Massachuset ts Inst i tute of Technology ( D r. Hardy)Found Laboratory 1 National Advisory Committee f o r Aeronautics, Cleveland 1 Natio nal Bureau of Standards, Atomic Energy Pro je ct 1 Nat ional Bureau of Standards (Library) 1 Na ti on al Lead Company, Inc. , Wi nch est er 1 Naval Research Laboratory 3 New York Op er at io ns Of f i ce b 2New York Univers i ty (Dr . Richtqyer ) 1 Nuclear Development Corporation of America 1 Nuclear Metals, Inc. 1 Oak Ridge In s t i t u t e of Nuclear Studi esOak Ridge National LaboratoryOffice of Naval Research 10

1

t

8/8/2019 858195

5/19

ll i H211- .ibulA on

I'ililI.ips 1)etro:lem Companyh b J i c Health Serv iceItRNL) Corpoi*at,ionS nndia CorporationS i g n a l C o q x CeritcrS y l v a n i a E l e c t r i c Produc ts , Inc.Technical Opcrati ons, IncorporatedUnion Carbide Nuclear Compny (K-25 Plan t ) )United Aircraf t CorporationU. S. Geological - Survey, DenverIT. S. Naval Ordnance LaboratoryU. S. Naval Post,graduate SchoolU. S. Naval l iadiological Defense LaboratoryU. 8 . Fatent Off iceUniversi ty of Cal i fornia Radiat ion Lakoratory, Berkel'eyUnivers i ty of Ca l i fo rn ia Radia t ion Laboratory, LivermoreUniverhi ty of Rochester, Atomic E n e rg y ProjectUnivers i ty of Rochester (Drc Elarshak)V i t r o Engineering Divis onWalter Reed Army Medical CenterWatertown ArsenalWeil, Dr. George L.Ides t inghouse E lec t r i c Corpora t ionTechnical Information S erv ice Extension, Oak RidgeOff i c e o f Techn ical Servi ces, Washington'

,

NO. o f Copiei-t?~

622 ,1I'112' '23I21E1:221211112

3001PO0

Manager, Pi tt sb ur gh Area Office 29WAM D i s r i b u t i i n XN 70

8/8/2019 858195

6/19

TABLE OF CONTENTS

A, Reactor Vessel,.o.~o. . . ~ 2B o P r e s s u r i z i n g Ve s s e l o . .0.0. . . . . . . .~~~~~~~~~~~*~~.. . . .0. . . .*.3C, Main Loop and Pressurizing Vessel Piping,. . . . . . . . . . . . . . . , . . 3De Auxi l i a ry P ip ing O O O O O . . . . ~ . O . . ~ ~ ~ ~ ~ . ~ ~0 0 ~ 0 ~ ~ ~ 0 0 ~ 0 0 0 0 ~ 0 0 0 0E. Steam Generators and Auxiliary,Heat Exchangers.,.... .......F. Main Coolant Pumps ,, . . e . a e . . . e , . e . . .G, Main or Au xi l iar y Pr imary Plant Valves. . .... *. . . 4H, Auxiliary Vessels , such a s Fla sh Tanks, e tc , , , . e , , 4J, Plan t Conta ine r, , . e e o e . e o . e e o . . . a ,. ,4

11, UNDERWRITERS CODES. e e o. . , e . . e , . . . e e o e o . . ., . o . .111, MAJOR CODE EXCEPTIONS AND INTERFfE?"i!AIONS. . , e o . . e -5

A, Plant Container, ,,. o , , . , ,. . , . . . * . , 5B o Steam Safe ty Rel i ef Valves, . ,, e e 4 . . . . e o. . e , . 6C , Primary Coolant Relief Valves.

e

. . .. .. . . . , . 6I V . ASME BOILER AND ITtESSURE VESSEL COMMITTEE SPECIAL RULINGS,,.....9

8/8/2019 858195

7/19

FRESSURE VESSEL AND PIPING CODES

APPLICABLE TO HnJ)I REACTOR PLANT

J, F. Dobinsky, M, Bo Andrew, To R e Moffette

I . ASME CODE AND STATE GOVERNMENTREGULATIONS

The p o l ic y of t h e Atomic Energy Commission (AEC), r e l a t i v e t ofo l lowing S ta te codes and regu la t ions i n t h e d e s i g n of t h e ArJR plan t , i se x t r a c t e d f ro m a l e t t e r o f A u g u s t 10, 1954, y the Manager of the Pfttsburgh

Area Office (PAO) of t h e AEC t o t h e Manager of t h e Westinghouse B e t t i s Plant ,as follows::

As a matter of genera l po l i cy, f o r t h a t p o r t i o n of t h e p l a n twhich w i l l be proper ty of th e Government and fo r Duquesne Ligh tC o o p r o p e r t y w i t h i n th e r e a c t o r area and loca ted on l and l easedt o t he Government by Duquesne Light, S t a t e codes sh oul d beobserved where ma te ri al and equipment ar e of such a n a t u r e t h a tp rov i s ions of e x i s t in g codes a re obv iously app l i cab le , FOPt h o s e i t em s an d f a c i l i t i e s which a r e n o t d e f i n e d un de r e x i s t i n gcodes , eve ry e f f o r t will be made to comply with those provis ionswhich are most a p p l i c a b l e , . b u t i n t e r p r e t a t i o n i n t h e se i n s t a n c e ssha l l r emain a f u n c t i o n o f - h e Governmenta

cases , it appears that compliance with- he State code w i l l r e s u l ti n a n in c r e a se i n th e o v e r - a l l c o s t of t h e p r o j e c t above t h a ts e t fo r t h i n the approved co st es t imate , refere nce should be madet o t h i s of fic e, Observation and compliance as u se d i n th e f o r e -going s h a l l not be construed t o mean t h a t c e r t i f i c a t i o n by t h eS t a t e i s a necessa ry coro l l a ry, b u t c e r t i f i c a t i o n i s d e s i r a b l ewherever p rac t i cab le .*tWith resp ec t t o r a d i a t io n exposure . and d i sp osa l of waste , i t h e ri n d u s t r i a l o r rad ioa c t ive , S t a t e r egu la t ions , where and i f e x i s t -ing> sh a l l be obse rved un less s t andards o f th e A E C are mores t r in g e n t . I n t h i s - ca s e, t h e l a t t e r r eq ui re me nt s s h a l l bea p p l i c a b l e e If

The ques t ion of app l i c ab le codes has been reso lved fo r t ha t po r t io n

I f , i n t h e above

of the FWR plant which i s non-convent ional , namely the reac tor pl an t cont ain erand components within the containero

The Department o f Labor and Industry, Didsion of Boi le r s of theCommonwealth of Pennsylvania, has ju r i s d i c t io n over power p lan t ves se l sin st a l l ed f o r use i n th e Commonwealth.

- 1 -

\

8/8/2019 858195

8/19

The Department has adopted the provision of:

( a )The ASME Boiler and Pressure Vessel Code,Sec. I , 1952 e d i t i on , w it h l a t e s tpublished supplements, f o r Sts r e p r i n tof . the Pennsylvania Rules f ; z Construct ionof Power Boilers .

(b) The ASME Bo il er and Pr es su r! Vessel Code, Sec. VIII,1952 Edi t ion , wi th l a t e s t dib l is hed supplements , i nthe Pennsylvania Regulation : f o r Unfi red PressureVesselsg 1954 Edit ion.

S ince the S ta te recognizes the a love ASME Codes, the State w i l laccep t vesse l s cons t ruc ted by qua l i f i ed ve idors and s tamped wi th Nat iona l

Board numbers without any special administ: 'ative procedure or review by theI n d u s t r i a l B oard of the Department of Labc: and Industry.a r e those who have va l id c e r t i f i ca te s o f s i ' . thor iza t ion fo r use of code symbolsfrom t h e ASME Code Committee and a r e reco&.Lzed and r e g i s t e r e d by t he State ofPennsylvania, Such qu al i f ie d vendors have an ex is t i ng system f o r transmittalof n e c e s s a r y i n s p e c t i o n r e p o r t s t o t h e ASMI: and s t a t e agencies and do s o a s amatter of record,

Qual i f ied vendors

Where th e ASME Code i s mentioned below, equa l ap pl ic ab i l i t y of an dconformance t o th e r espec t ive s ta te regu la ; ions a re implied.

\ If v e s s e l s o r component? are de,signed or constructed with any"exceptions1' t o the above codes, a 'lPenns,) vania S p c i a l r c c l a s s i f i c a t i o n f o rt h a t v e s s e l c a n b e ob ta ined by pe t i t ion ing the I nd us t r i a l Board of th eDepartment of Labor a nd I n d u s t r y f o r s u c h l a c l a s s i f i c a t i o n ,IIPennsylvania Sp ec ial fr coded ve ss el s i n tke PkJR pla n t shou ld be kep t t o aminimum because t o th e uninformed laymen'! v i e w, such a vessel might beconstrued as unsafe,, Further, such vessE..s might be ru le d un acceptable andmight need some modif icat io n pr io r t o acc. iptance, which could p a v e co st ly ,

I t was f e l t t h a t

A study showed that a l l cDmpomits governed by the above codes couldb e b u i l t as s tandard ASME codes vesse l s w-th the excep t ion of the p la n t con ta i neran d safe ty devices and appurtenances,,

Meetings were held a t H a r r i s k h g w it h Mr Blaine Book, Chief,

Div i s ion o f Boi le r s, wi th represe n ta t iv es of th e AEC, Westinghouse and cognizantvendors, t o r e s o l v e c o d e c l a s s i f i c a t i o r :j f o r th e components,decisions have been reached:

A. Reactor Vessel

The following

T h i s v e s s e l c o n t a i n s a h e a t S O U T C E and i s therefore designed andc o n s t r u c t e d i n a cc or da nc e w i t h t h e ASPE Code, Sec. I , an d will be stamped witha n ASME Code symbol and number.

- 2 -

8/8/2019 858195

9/19

8/8/2019 858195

10/19

WAPD- nTR-.974

t h e v e s s e l up t o t h e f i r s t c i rcumferen t ia l jo in t fo r we ld ing end connec t ions ,the Pennsylvania Regulat ions for Unfired Pressure Vessels covers the pipingf rom the ves se l up to and inc lud ing the f i r s t s t o p valve. The main steam an dboiber fe ed l i ne s a re accord ing ly cons t ruc ted i n compl iance wi th thesereg ula t io ns, The sec ' t ions o f the s team genera to rs and the au x i l i a ry hea t ex-changers a s de li ve re d t o t he S it e have ASME Code Sec. V I 1 1 stamping.

F. Main Coolant Pumps

The outermost pressure containing parts o f the pumps were designed using

Welding and weld design were i n accordance wi thas a guide the l i m i t s of t h e ASPE Code, Sec, V I I I , The materials used werere co gn iz ed by t h e ASME Code.the requirements of ASME Code, Sec. I , and as supplemented by Westinghousep r o c e s s s p e c i f i c a t i o n s ,

G, Main or Auxil iary Primary Plant Valves

( I ) Safe ty Valves. Oue t o t h e u ni qu e h e a t s o ur c e i n t h i s s yst em , t hea p p l i c a b l e r e q u i r e m e n t s of S e c , I, r e g a r b n g s a f e t y v ai ve s and appur t enancescould not be met, s i n c e t h e y were w r i t t e n f o r a convent ional ly f i r e d b o i l e rt h a t was read i l y acce ss i b le for inspect ion, maintenance and repair.

The sa f e t y in te n t of the above code was fo l lowed ,

Sp ec if ic waivers have been request ed f r o m t h e I n d u s t r i a l B oard onthe main steam l i n e s and the pr imary coolant re l ief valves and have beenapproved by that agency, These a r e d is cu ss ed i n d e t a i l l a t e r i n t h i s r e p o rt ,

( 2 ) Main Coolant and Other Valves,, These valves were .designed andcons t ruc ted t o meet the requirements of ASME Code, Sec, I , P-299 t o P-318 an dASA B-16,5, 1953 Edit i on, St ee l Pipe Flanges and Flanged Fi t t in gs ,was done i n accordance with the requirements s e t f o r t h i n ASIE Code, Sec.V I I I , as sup ple mn ted by West inghouse process s pe cif ic at io ns .

Welding

H, Auxil iary Vessels, such as Fla sh Tanks, e t c ,

These ve ss el s were designed and cons truct ed i n accordance with ASMECode, Sec, V I I I .

J, Plant Container

This vesse l w a s designed and con struc ted i n accordance with ASME Code,Sec, V I I I , 1952 Edit ion, and Fennsylvania Regulat ions for Unfired PressureVessels, 1954 Edit i on, with ce r t a i n l*except ions. The I texceptionst ' wererequired due t o u n i q u e c h a r a c t e r i s t i c s of t h i s v es se l.f o r t h i s v e s s el t o be b u i l t t o code to i n s u r e s t r u c t u r a l an d f u n c t i o n a ladequacy,p e t i t i o n e d f o r l lP en ns yl va ni a S p e c i a lt t c l a s s i f i c a t i o n f o r t h i s v e s s e i , w he re inthe excep t ions were l i s t ed ,

However, i t i s d e s i r a b l e

The Industrial Board of the Department of Labor and Industry w a s

The Board accepted the pet i t ion and the vessel was

- L ! l -

8/8/2019 858195

11/19

WAPD- W R - 74

stamped upon completion, "Pennsylva nia Sp ec ia l P,V, No. 1671. ' The exceptionst ak en a r e d is cu s se d i n some d e t a i l l a t e r i n t h i s r e p o r t ,

11, UNDERWRITER CODES

Since t h i s p r o j e c t i s a Government ins ta l la t ion, t h a t p o r t i o n of t h ep l a n t l o c a t e d i n th e p l a n t c o n t ai n e r i s not insured by a private insurance company.This por t ion of the p la n t has been des igned and cons t ruc ted i n accordance wi threcognized codes , however, s o t ha t the p la nt may be und erwri tten by insur anceconcerns a t some future date i f desired,

111, MAJOR CODE EXCEPTIONS A N D INTERPRETATIONS

A s noted above, the major excep t ions and in te rp re ta t i on s have beenconcerned wi th :

A . Plan t Conta ine r

A p e t i t i o n , document WAF'D-AD(M)-292.5', d a ted Feb ru ary 7, 19.5'5, Subj :P e t i t i o n f o r P e nn sy lv an ia S p e c i a l C l a s s i f i c a t i o n on R, V, Conta ine r f o r FWRwas s e n t t o t h e I n d u s t r i a l B o a r d of the Department of Labor and Industry.p e t i t i o n r e qu e s te d t h e c on t a in e r be c l a s s i f i e d as a T4Pennsylvania Spec ia l* 'v e s s e l ,below. (However, sub seq ue nt ASME "S pe ci al Rulingsi1 No. 1 2 2 6 and No, 123s9d is cu ss ed i n d e t a i l l a t e r i n t h i s r ep o rt , permit the fol lowing two nexcept ions18t o f a l l w i t h i n t h e ASME Code.of the ASME Code, as mentioned previously, and does no t ye t incorpora te these"Special Rul ingstr. )

The

The vessel was designed t o Pennsylvania Code wi th tw o e x c e p t i o n s l i s t e d

Cur ren t s t a t e Code i s based on the 1952 e d i t i o n

(1) Subsect ion B, Sec, W-2 (a), ASME Code, Sec, V I 1 1

T h i s s e c t i o n s t a t e s i n e f f e c t , t h a k a l l v e s s e l s t h a t a r e t o con ta inl e t h a l subs tances, when fa br ica ted o f low-a l loy o r ca rbon s t e e ls h a l l be s t r e s s r e li e v ed , T h e r m a l s t r e s s r e l i e f i s i m p r a c t i c a l duet o t h e l a r g e s i z k of the con ta ine r s , ,

( 2 ) Subsect ion A , Sec, UG-125 ( a ) ASME Code, Sec, VI11

This s e ct i on s t a t e s i n part: A l l u n f i r e d p r e s s u r e v e s s e l s w i t h i nthe scope of t h i s c o d e i r r e s p e c t i v e of s i z e o r pr es su re , s h a l l b e

prov ided wi th p ro t ec t ive dev ices i n accordance wi th the requi rementof UG3.25 through UG-134, The bas i c r eason f o r p rov id ing con ta in e r si s to prevent escape of t o x i c g a s e s o r r a d i o a c t i v e material into t h eatmosphere,would n u l l i f y t h e f u n c t i o n of t h e c o n t a i n e rs ,

The presence of code r e l i e f va lves se t a t des ign p ressure

Approval was r e c ei v e d i n a Department of Labor and Indus t ry l e t t e r , da tedMarch 22, 19.5'5, which auth orize d t he completed con tai ner t o be s tamped18 Pennsylvania Special P, V. No. 1 6 7 ~

- 5 -

8/8/2019 858195

12/19

B, Steam Sa fe ty Relie f Valves

A petition, document WAPD-AD(MM)-3016, dated March is, 1955 r e -'quested waivers on requirements of ASME Code, S e c , I on these valves ,Approval w a s g r a nt e d i n a Department of Labor and Indus t r y l e t t e r da ted June27, 1955.

C, Primary Coolant R e l i d Valves

A petition, document WAP.D-AD(MM)-3339, dat ed August 8, i955, requestedwaivers on the re l i e f valves , appurtenances such as gage cocks and sightg l a s s e s , e t c , , as s p e c i f i e d i n ASME Ccde, Sec, .io

.-

The s pe ci fi c waivers r eq ui re d on th e main steam Lines and the primaryc o o l a n t r e l i e f valves a r e l i s t e d b elows

That the use of w a t e r r e l i e f v a l v e s in 1Seu of s team sa fe tyr e l i e f v a l v e s t o p r o t e c t t h e r e a c t o r v e s s e l be a ll ow ed s i n c eno steam i s generated i n t h i s vessel,

That t h e v a l v e s be s i z e d t,o re l ieve expanding water a t a r a t ewhich will prevent the niaximum pressure from r i s i ng more than6% above d es ig n press ure when th e r e a c t o r i s opera t ing a%maximum c a p a b i l i t y,f o r c a l c u l a t i n g t he r e q u ir e d v a h ~ apacity, si nc e the methodof determining rel ieving capaciCy as l i s t e d i n P-27h o r P-2'75i s n o t a p p l i c a b l e t o t h e IWR type o f p l a n t ,

A method was def;emfned t h a t w a s a p p l i c a b l e

That the use of ba lanced ( spr ing- loadsd) typs s a f e t y and r e l i e fvalves whose c apa ci t i es and s e t poifits are independent of backpressure be allowed,PliJR p l a n t s i n c e t h e e f f l u e n t f r o m t h e valves i s r a d i o a c t i v e a n dmust be contained and condensed, which, i n turn, r e s u l t s i n aback pressure on the va lves , This mouirement i s a t variancew i t h P-278 an d P-279-

This requirement I s e s s e n t i a l f o r t he

That the use of a l i ft f rz g de vi ce , a s l i s t e d i n P-282, not berequ i red , I t i s u n d es i r ab l e t o t e s t t h es a v a l v e s d ur i ngopera t ion o f th e pl an t, However, if necessary they can bete s t ed wi th tl i e p lan t shu t, downo The valves w i i l be t e s t e d

t o insure func t iona l , opera t ing and s t . r uc tw al adequacy, i n at e s t loop, p r i o r t o i n s t a l l a t i o n i n t h e pl.ant,

T h a t t h e i n s t a 1 i a t i . m of dupl. icat ,e r e l i e f va lves (wi th shu t-o f f s i n e ac h d i sc ha rg e l i r i e whish a re i n te r lo cked t o p reven tc lo s in g of bo th r e l i e f pa ths ) be a llowed , Past experisnceh a s s h o w n u n s a t i s f a c t o r y r e s e a t i n g c k a r a c t e r i s t i c s i n somevalves which has required reac-bor shutdown,

8/8/2019 858195

13/19

( 6 ) That t he l oc at io n and method o f i n s t a l i a t i o n of sa fe ty r e -l i e f valves , as l i s t e d i n P-277 and referenced paragraphs,

be waived and that the valves be i n s t a l l e d i n a c u b i c l es h i e l de d f ro m t h e v e s s e l s t h e y p r o t e c t f o r a c c e s s i b i l i t yand maintenance purposes,

T ha t t h e s e t t i n g of t h e r e l i e f v a lv e f o r each loop be allowedt o be 2 8 3 0 p s i ,loops i s th a t the p ress ure dur ing i s o l a t io n would no t exceed120% of th e design values f o r 1% o f t h e time as s p e c i fi e d i nP - 2 3 , f ( 2 ) 0 I t i s poin ted ou t tha t these va lves would oper-a t e o n ly i n an emergenuy where^ an ex te r na l source of hea t i sappl ied, o r by opera t ion of t he charging pump when the loop i si s o l a t e d ,t h e s i z i n g of t h e r e l i e f v a lv es f o r the two in te rn a l ly hea tedv e s s e l s, t h e p r e s s u r i z i n g t a n k and t h e r e a c t o r v e s s e l , It i sundesirable t o s e t t h e s e v a l v e s a t d e s i gn p r e ss u re 9 s i n c e t h e y

would th en open a t t he same time as t h e m a i n r e l i e f valves ont h e r e a c t o r v e s s e l ; t h e main v a l v e s h a v e s u f f i c i e n t c a p a c i t yt o re l i ev e th e system, These valve s ar e needed only f o r a ni s o l a t e d l o o p .a source o f t roub le t end ing t o & a h the vesse l ,

That t h e s e t p r e s su r e t o i e r a n ce f o r a l l s a f e t y v al ve s i n t h eabove system be 2 50 ps i .l o ad e d ) t y pe s a f e t y an d r e l i e f v a lv es , f i o p s i of s e t p re s-s u r e i s d i f f i c u l t t o meet,

That the "blowdownIt requirement, as l i s t e d , i n P-281 be am a x i m u mof 6% 0condi t ions s in ce thes e vaives do not have t he pop ac t i onof c o n ve n t io n a l s a f e t y v a l v e s,

( 7 )The basis f o r t h e 2830 p s i g s e t t i n g on th e

The capac i ty of t hese va lves was not inc luded i n

I f t h e s e va l ve s f a i l e d t o r e s e a t , t he y co u ld be

( 8 )With the use of balanced (spring

( 9 )A maxhum of 4% cannot be met under all

A waiver was a l s o reques ted on the water and steam gages se ct io n ofASME Code, Sec, I , P-291 through P-298 and the referenced paragraphs therein,f o r t h e f o l l o w i n g r e a s o n s :

(1) Paragraphs 291 through 2 96 wouldLII . r e q & r e g a g e g l a s s e s andt ry -cocks on the p ress ur i ze r and re ac to r vesse l , Thesewould b e u s e l e s s on t h e r e a c t o r v e s s e l s i n c e t h e v e s s e li s c om pl et el y f i l l e d w it h water,i s o n l y p a r t i a l l y f i l l e d w i th w at er , s i n c e it cannot be seenby the operator because of shi 'e lding 'and i t s l o c a ti o n i n t h ere ac to r pl an t conta iner, t h i s equipment would ser ve no use-f u l purpose,

Al though the p ressur ize r

- 7 -

8/8/2019 858195

14/19

( 2 ) Paragraph 297 s p e c i f i e s : "The d i a l of t he s team gage s h a l lbe graduated t o approximately double the pr essur e a t which

t h e s a f e t y v a lv e i s s e t b u t i n no c as e t o l e s s t h a n 1-1/2t imes th i s p ressure . I ti n t h e c o n t r o l room i n d i c a t i n g t h e p l a n t p r es s ur e a l l e xc e p tone of which meet the requirement of P-297. The pressures i g n a l t o e ach i s e l e c t r i c a l , w it h a n i n d i v id u a l e l e c t r i c a lc i r c u i t f o r each. These i n s t m e n t s and t h e i r r an g es a r e:

There a re ac tua l ly seven ins t ruments

Range, psig

One pres su ri ze r press urei n d i c a t o r - r e c o r d e r, c o n t r o l l e r

1800 - 2300

One pr es su ri ze r press ure 0 - 3000i n d i c a t o r

One re ac to r ves se lp r e ss u re i n d i c a t o r

Four main loopp r e s s u r e i n d i c a t o r s

0 - 4000

0 - 4000

Cont ro l of th e p la n t p ressure i s done by means of th e s i g na lt o t h e p r e s s u r i z e r p r e s s u r e i n d i c a t o r - r e c o r d e r - c o n t r o l l e r,which has a range of 1800 to 2300 psig.were requ i red t o have the range requ i re d i n P-297, i twould reduce the accu racy of the instrument and incr eas ethe f requency of opera t ion o f the sa fe ty va lves , Fur ther-more, i n view of t h e f a c t t h a t a number of o t h e r wide-rang eins t ruments mee ting the in te n t of P-297 will be i n s e rv i c e,it i s b e l i e ve d u nn ec es sa ry f o r t h i s i n st r um e nt t o a l s omeet the code requirement.

I f t h i s inst rument

Approval f o r th ese changes was g ranted i n a Department of Labor andI n d u s t r y l e t t e r d a t e d September 19, 1955.

A l l major components have been reviewed wi th th e Department of LaborSpecif ic rul ings have been agreed upon with Mr Blaine Book,nd Industry.

C hi ef , D i v i s i on of B o i l e r s , and t h e a bove r u l i n g s a r e on f i l e i n h i s

o f f i c e .

The n e c es s a ry p e t i t i o n s a r e on f i l e wi t h t h e S e c r e t a r y of t h eIndus t r i a l Board .

- 8 -

8/8/2019 858195

15/19

WAPD- WR-974

IV, ASME BOILER AN D P ~ S S U R E ESSEL C O ~ T T E EPECIAL 'RULINGS

The Boiler and Pressure Vessel Cormnittee of t cons ide rsCommitteerCases18 here u s e r s ha ve d i f f i c u l t y i n i n t e r p r e t i n g t h e Code.i n t e r p r e t a t i o n s a r e s u b m i t t e d t o t h e ASME Board on Codes and Standards,au thor ized t o pass upon them,

Engineer ine , These re ce n t in qu i r i e s and ru l ing s a r e i n t e n d e d f o r n u c l e a ri n s t a l l a t i o n s i n ge n er a l, and a r e of c o n s i de r a bl e i n t e r e s t w it h r e g ar d t oPWR,r u l i n g s , th e PWR design complies with the new requirements wherever appl icable .

The following Case I n t e r p r e t a t i o n s w e r e f o r m -. ul at ed by th e Committee, approved by the Board, and re po rt ed i n Mechanical

Although WR was d es ig ne d a nd p a r t i a l l y c o n st ru c te d p i o r t o t h e se

Case No, 1 2 2 4 (S pe ci al Rulin g) (Mechanical Eneinee rinq, Vole 78, Oct., 1956,P. 969)

"Inquiry: Neither Sec, I nor Sec, V I 1 1 of the ASm Boi le r andPressure Vessel Code as now wr i t t en p r ec i se l y covers p ressure ve sse l st h a t are a n i n t e g r a l p a r t of a n u cl e ar i n s t a l l a t i o n ,s h a l l t h e y be c o n s t r u c t e d ?

The Committee recognize s t h a t i n the des ign of nu clea ri n s t a l l a t i o n s , r e q u i r e m e n t s w i l l d i f f e r from those o f conven t iona lb o i l e r s a nd p r e s s u re v e s s e l s ,

i n t e g r a l p a r t of n uc le ar i n s t a l l a t i o n s b u i l t i n ac co rd an ce w it h t h erequirements of t h e ASME Boiler and Pressure Vessel Code as modif iedo r d e f i n e d i n t h i s a nd s u bs e qu e nt c a se s , meet t h e i n t e n t of the Code,and each ves se l s h a l l be marked as r e q u i r e d by th e s e c t i o n t o w hic h i t

i s b u i l t includ ing th e app rop ria te Code Symbol, I n addi t ion, the words ,"Case No, - h a l l a p p e ar o n t h e Data Report.A l l v e s s e l s t h a t a r e an i n t e g r a l p a r t of n u c le ar i n s t a l l a t i o n s

s h a l l b e c o n s t r u c t e d i n ac co rd an ce e L t h er w i t h t h e r e q u b e m e n t s o fSec, I o r w i t h t h e r e q u i r e m e n t s of Sec, VI11 f o r v e s s e l s t h a t a r e t oc o n ta i n l e t h a l s u bs ta n ce s a

vessels sha l l terminate at :

Under what rules

Reply:

1, I t i s the opinion of the Committee t h a t v e s s e l s t ha t a r e a n

2,

3 , I t i s in tended t h a t j u r i s d i c t i o n o ve r p i p in g e x t e r n a l t o

(1) The f i r s t c i r c u m fe r e n t i a l j o i n t f o r w el di ng e ndconnect ions; or,

( 2 ) The face of the f i r s t f l an g e i n b o l te d f l a n g econnect ions; or,

( 3 ) The f i r s t t h r e a d e d j o i n t i n t h a t type of con-ne c t i on, If

Case No, 1224-1 (Reopened)( Sp ec ia l R u i n g ) (Mechanical Engineering, Vol, 7 9 ,A p r i l , 1957, po 3 9 3 ) i

Add the following as new I t e m 4 n the Reply:

- 9 -

8/8/2019 858195

16/19

"Def i n i t i o n s r

The Reactor Vessel i s t h a t v e s s e l i n which n u cl e ar f u e l i s p r e s e n ta nd i n whPch t h e n u c l e a r ' c h a i n r e a c t i o n t a k e s p l ac e .Primary Vesse l s a re those vesse l s , o the r than the reac to r andcontainment ve sse ls , which con tai n o r may contain rea ct or coolant .These vessels may be heat-exchangers , pr es su r i ze r tanks, dr ai n tanks,dewate r ing vesse l s , e t c . Secondary ves se l s a r e a l l o t h e r v e s s e l swhich do no t con ta in re ac to r coc lan t o r a r e n o t o t h er w is e s u b j e c tt o i r r a d i a t i o n . S ec on da ry v e s s e l s a r e c ov er ed i n a p p r o p r i a te s e c t i o n sof the Code,Containment Vesseis are those outer vessels which enclose the reactor,v e s s e l o r por t ions o f the pr imqry coo lan t c i rc u i t o r both,con ta inment vesse l s a re no t normal ly p ressur ized and a re bu i l t toc o n t a i n t h e l e t h a l r a d i o a c t i v e s u b st a n ce s t h a t may b e r e l e a s e d i n case

of a n a c ci d en t o r f a i l u r e of t h e r e a c t o r v e s s e l o r t h e primary c o o l a n tc i r c u i t o r both , "

The

Case No. 1225 (Special Ruling)(Mechanical Engineering, Vol, 78, Oct., 1956,p. 969)

"Inquiry: Various s a fe ty requirements o f Sec. I and Sec. I11

May these requirements be modif ied f o r rea ct or swould a c tu a l l y be hazardous if a p pl ie d l i t e r a l l y t o t h e d es ig n ofn u c l e a r " r e a c t o r s .of the p r essur ized wa te r and bo i l i ng wa te r types ?

Reply:of the pressur ized-w ater and boi l ing-wate r type w i l l m e e t t h e i n t e n tof t h e Code and s h a l l be marked i n accordance wit h Case No. 1 2 2 4 ifthe fo l lowing p rov i s ions a re met :

To t a l l y enc losed pop-type sa fe ty o r r e l i e f v a lv e s s h a l l bep ro vi de d , b u t n ee d n o t be d r r e c t l y a t t a c h e d t o t h e v e s s e l p r o vi d edt h e r e i s no valve between the ve ss el and the sa f e ty o r r e l i e f v a l v e ;also they s h a l l b e i n s t a l l e d a s c l o s e a s i s p r a c t i c a l t o t h e v e s s e l .They sh a l l no t d i scharge t o th e a tmosphere, and s h a l l d i scharge t o asu i t ab le sys tem des igned t o condens4 any vapors ,o r r e l i e f v al ve s a r e r e q u i re d an d t h e t o t a l c a p a c i t y shall b e s u f f i c i e n tt o i n s u r e t h a t t h e d e s i g n p r e s s u r e 4s not exceeded by more than

Di rec t r ead ing p ressure gages a re no t r equ i red ,independent de v ices fo r de te rmining p ressure a r e requ i red and theseshall not be dependent on the same external sources of energy.

cocks a re no t r equ i red . "

I t i s the op in ion of the Committee th a t nuc lea r r ea c t o r s

1.

A t l e a s t two s a f e t y

2. A t l e a s t t w o

3*In sp ec tio n openings, gage gla sse s, wate r columns, and gage

Case No. 1 2 2 6 (Special Rul ing)(Mechanical Engineer ing, Vol. 78, Oct, , 1956,p. Y70)

"Inquiry: May containment vessels for n u c l e a r r e a c t o r i n s t a l l a t i o n sbe bu i l t under Sec . V I I I , Code f o r Unfired Pressure Vessels, withouts t r e s s r e l i e v i ng a s sp ec if ie d i n Par. UW-2(a)?

- 10 -

8/8/2019 858195

17/19

Reply: I t i s the opinion of the Committee that these containmentv e s s e l s f a i l under t h e c a t e go r y of t h o s e c o n t a in i n g l e t h a l s u b st a n c es

b u t s t i l l may be b u i l t w i t ho u t s t r e s s r e l i e v i n g p ro vi de d t h e f o l l ow i n grequirements are met :

e l e m e n t s ( n o t i n s i d e a h e a t ed e n c lo s u re ) * s h a l l conform t o s p e c i f i c a t i o n sSA-300 f o r p l a t e s and SA-350 f o r forgings.and the constructi 'on s h a l l meet th e impact t e s t r equ i rements of Par.UG-84 a t a t empera ture no t l e s s than 30F below the lowest recordedm b i e n t t e mp e ra t ur e of t h e a r e a i n which t h e c o nt ai nm en t v e s s e l i s t o bee r e c t e d , e x c e p t t h a t t h e l o w e s t t e s t t e m p e r a t u r e may be assumed t o be- 50F f o r a n y p a r t o f the Uni ted S ta tes . "accordance with Sec,, I X .

i n t o s h e l l p l a t e a nd s t r e s s r e l i e v e d as comple te assembl ies f o r we ldingi n t o t h e s h e l l .t h e d e s i g n of t h e r e in f o rc e m e nt f o r. l a rg e o pe n in gs as s t r o n g as t h es h e l l , ( s e e F ar. UA-7) .

The th ickness of s h e l l and head p l a t es s h a l l no t exceed th a tf o r which s t r e s s r e l i e f i s r e q u i r e d i n ac c or da nc e w i t h Par. UCS-56.

A l l l o n g i t u d i n a l a nd c i r c u m f e re n t i a l j o i n t s s h a l l be o f t h edouble-welded bu t t type and sh a l l be f u l l y rad iographed i n accordancewith Par. vW-slaan d a l l welds th at cannot be radiographed s h a l l be examined f o r cracksby m a g n e t i c p a r t i c l e o r f l u i d pene t ran t method of inspec t ion .

6,

Report Form".

l o P la tes and fo rg ings o f containment vessels exposed to the

These and other mater ia ls

2. Welding procedures and operators s h a l l be q u a l i f i e d i n

3. A l l doors, nozzles , and opening frames s h a l l be preassembled

A l s o , spec ia l cons ide ra t ion shou ld be g iven t o make

4.

5.

A l l welds on doors, nozz les, and openings frames,

The Case number s h a l l a p pe a r i n t h e M a n u fa c t u re r 's Data

Case No. 1 2 2 6 - 1 (Reopened) (S pe ci al Ruling) (Mechanical Engineering, Vol. 78,Dec., 1956, po 1169)

" In the Rep ly, r e v i se Par. ( 4 ) t o r ea d: (4 ) The thickness of th es h e l l and head plate s h a l l not exceed t h a t f o r whic h s t r e s s - r e l i e v i n gi s r e q u i r e d i n a c c or da n ce w i t h Par.. UCS-56, e x c e p t t h a t f o r materialsl i s t e d under group P-Number 1 n Table UCS-23, st r e s s- re li e v in g i s notr e q u i r e d i n t h i c kn e s se s o ve r 1-1/2 in.,. and up- to 1-1/2 i n . , i n c l u s i v e ,provided a preheat of 200F i s used during welding."

* I t i s cons ide red tha t pa ragraph (1) d oe s n o t a p p l y t o PWR s i n c e t h e p l a n tc o n t a i n e r i s e n c l os e d i n a c o n c r e t e b o x- li k e s t r u c t u r e , a nd i s not exposedd i r e c t l y t o the e lements ,b e c o n t i n u a l l y r e p l e n i s h e d w i t h warmed a i r f o r c e d i n f r o m t h e f u e l h a n d l i n gb u i l d i n g .p la n t con ta ine r whenever the reac t o r p l an t i s i n o pe ra ti on .t e s t s were no t made, the p la te s and fo rg in gs used as p r e s s u r e r e t a i n i n gpa r t s do conform t o the m ate r i a l r equ i rement o f pa ragraph (1).

The atmosphere wi th in th e conc rete enclosure will

A d d i t i o n a l h e a t will b e r a d i a t e d a n d convected f rom within theAlthough impact

- 11 -

8/8/2019 858195

18/19

Case No, 1226-2-X--(Reopened) Special Ru1ing)CMechanicai Engineering, Vol , 79,Feb., 1957, P. 1 9 s )

"I n th e Reply, re vi se the d ef in i t io n of Corita inment Vessels a t t h een d of Case t o rea d a s fol lows:

Containment Vesseis a r e those ou te r vesse ls which enclose ther e a c t o r v e s s e l or p o r t i o n s of t h e p r i m a r y c o o l a n t c i r c u i t or both. Theconta inment ves se l s a re no t normal ly p ressur ized and a r e bu i l t t o c o n t a i nt h e l e t h a l r a d i o a c t i v e s u bs ta n ce s t h a t may be r e l e a s e d i n c a s e of ana c c i d e n t or f a i l u r e of t h e r e a c t o r v e s s e l or t h e p r i m a r y c o o l a n t c i r c u i to r both.

P

Case No. 1226-3 (Reopened) (S p e c ia l Ruling)(I%echanicaJ. Eng ine erin g, Vol , 79,Apr i l , 1957, p. 393)

'!Revise th e In qu ir y as foilowsz

Inqu i ty : May containment v ess e l s a s de f ined i n Case No. 122b-LY- f o rn uc le ar r e a c t o r i n s t a l l a t i o n s be b u i l - c under Sect ion V I I I , Code f o r En-f i r e d P r e ss u r e Ve ss e ls , m i th o ut s t , r r s s - r e l i e v i n g as s p e c i f i e d i n P a r,UW-2(a)?

Add t o t he Re ply new subpa rag raph ( 7 ) as f o l l o w s :( 7 ) Prov i s ions f o r c o r r o s i o n shall be made i n accordance wit h Par.

UG-25.a p p l y t o con ta inment vesse l s , A

The mandatory requirements of P a r. UCS-2s a r e n o t i n t en d ed t o

Case No. 1228 (S pe ci al Ruling)(Mec hanica l1___- Engineer ing, V O J ~ 78, Dec, , 195'6,p. 1169)

"Inquiry:under Case No, 1 2 2 6 for a n u c l e a r r e a c t o r, + r i l l t h e v e s s e l b e a c c e p t a b l eif dur ing the pneumat ic t e s t ceP ;a in of the welds i n t h e l o w e r p a r t o ft h e v e s s e l a r e n o t a v a i l ab l e f o r i n s p c t i o n b ec au se of c o n c r e t e s h i e l d i n gor concre te suppor t s p laced on ins ide and ou t s ide of t h e v e s s e l a f t e rcons t ruc t ion o f the lower pa r t?

Reply: I t i s th e opi.nion of t h e Committee t h a t containmentv e s s e l s b u i l t u n d e r C a s e No. ,1226 f o r n u c l e a r r e a c t o r s w i l l meet theintent of the Code when erected i n tw o s tages , provided:

a nd f u l l y i n s p ec t e d a nd t e s t e d f o r l e a k t i g h t n e s s u s i n g a gas m e d i a

such as h a l id e l ea k d e t e c t o r t e s t p r i o r t o being covered.

I n a two-s tage son s t ru c t i on of a con ta inment vesse l bu i l t

I. Al l ina cc ess ibl e welds a r e double-b ut t welded, radiographed, ,2. A1 1 other r equ l rements of t h e Code are met including a

3. I n s p e c t i o n o f we ld ed j o i n t s i n t h e lo we r p a r t of t h e vesse idur ing the pneumat ic t e s t w i l l be waived where such joints are coveredby concre te dur ing the con s t ruc t ion o f the' vesse l , p rov ided the r e a reno openings o r pen etr a t i ons of t h a t pa r t o f the vess e l covered by concre te ."

9 The r t w i s i o n of Case ~IO,, 226-3 deletes t h e d c f i d t i o n g iven i n Case No. 1226-2 .

pneumatic t e s t o f the completed vessel .

,- - - ~~

,

I 1 2 -

8/8/2019 858195

19/19

Case No, 1235 ( I n t e r p r e t a t i o n o f Pars. UG-125 t o UG-134) (Mechan ical Engi nee rinq ,Vol. 7 9 , A p r i l , 1957, pp. 393-3941

l t Inqu i ry r May conta inment ves se l s f o r nuc lea r r e ac t o r i ns ta l l a t io nsbe b u i l t i n accordance wi th Sec t i on VIII, Code fo r Unfired P ressu reVesse l s , wi thou t p ressu re - re l i e f dev ices as r e q u i r e d b y Pars. U G - 1 2 5 t oUG-134?

Replyz I t i s the op in ion of th e Commit tee th at , s in ce i t i s in tendedt h a t t h e se v e s s e l s be d es ig ne d a nd b u i l t t o s a f e l y c o n t a in a l l t h e l e t h a lr a d i o a c t i v e s u b st a n ce s t h a t may be r e l e a s e d i n c a se of a maximum c r e d i b l ea c c i d e n t a f f e c t i n g t h e r e a c t o r ves se l o r p r i m a r y c o o l a n t c i r c u i t o r both ,and because of the hazardous character of th e m ate r i a l s which migh t ber e l e a s e d , p r e s s u re r e l i e f d e v i c e s a r e n o t r e qu i re d . If f o r a ny reasons uc h d ev i c e s a r e i n s t a l l e d , a d eq u at e p r o v is i o n s s h a l l b e made f o r s a f ed i s pos a l of the e ff luen t , l t

- 1 3