' U.SNRCýUMTI U I) 'EUSA-TES NCLE.R R.EGULAT ORY C(O •,MNISSION

Protecting People and the Emavjronment

U.S. EPR Containment SumpPublic Meeting

U.S. NRC Headquarters

TWFN, Room T-2B5

January 27, 20109:00a.m.

/US.NRC

Interactions to date" July 8, 2009 public meeting to discuss technical issues

identified by NRC staff" Several audits on test protocols and specifications

- Chemical Effects Testing- Downstream Effects Testing- Sump Strainer Head Loss Testing

* NRC staff witnessed testing- Chemical Effects Test (Lynchburg, VA)- Downstream Effects Test (Trenton, NJ)- Sump Strainer Head Loss Testing (Holden, MA)

" Subsequent to December 2009 sump strainer head losstesting, AREVA committed to re-design the facility andperform a new set of strainer head loss tests.

:iJU.S. NRC Future Interactions

* Upcoming audits on test reports whenavailable- Chemical Effects Testing

- Downstream Effects Testing

" Witness new set of strainer head loss tests- February, 2010

" Expect submission of revised technicalreport and RAI responses in April, 2010

I"V.

U.S. EPR GS1-191Head Loss Testing

AREVA NP Inc. and the NRCJanuary 27, 2010

byAREVAý ARE~VA

> To keep NRC apprised of AREVA NP's approach andprogress toward addressing RAIs related to GSI-191.

EP- R N i g 2> NRC Public Meýeting January 27, 2010

A2 AREVA

Sump Performance Strategy

0 Three tiered debris interceptor approach

P Trash racks/weir

O Retaining basket

O Strainer

EPR~by ARE VA > NRC Public

Meeting January 27, 2010

A3AREVA> NRC Public Meeting January 27, 20103AR V

Sump Performance StrategyWeir

Design Detail - 2"

............................. ...... I.................. . .. ...

.-l.6Ft-------- ......----------------

(notinmu leve during .......

re..ul....odfollowing a.. ...

. . . .. . . . .. . . . .............. ... ... ... ... .... ... ... ... ...

. . . .. . . . . . . . .

z-17Ft - "

-7Ft 4in

-IOR

Minium lvel un~n

folloing ao, duOn

=22"

..................................

............................................................

U

* : (Annular

Space

EPRTby AREVA

TowardsSIS pumps

- A4 AREVA> NRC Public Meeting January 27, 2010

> The debris generation evaluation process includes thefollowing and is based on NEI 04-07 and associated NRCsafety evaluation:

K Insulation Inventory (types, locations, amounts)

" Pipe Break Location Selection

" Break Jet Destruction Model Zones of Influence (ZOIs)

2" Insulation Debris Quantities (targeted and destroyed)

" Non-insulation Debris Types and Quantities Generated

" Debris Characteristics of Debris Generated

>'NRby APEVAw2 0

> NRC Public Meeting January 27, 2010 5 AR EVA

0I

> Development of the U.S. EPR debris source term employsthe guidance of NEI 04-07 and associated NRC safetyevaluation

> The U.S. EPR containment design is low fiber

> The debris generation evaluation performed consistent withmethods used for operating plants

byARVA

> NRC Public Meeting January 27, 2010 6 A REVA

T÷st F aili ty Description

> The test facility:

K Flume tank 35.5 ft long x 10.5 ft high x 5 ft wide

K Suction chamber at one end with a slanted strainer

K Recirculation pump (max flow - 400 gpm)

K Piping with valves connecting the pump to the suction chamber and thesimulated break above the heavy floor

K Retaining basket (RB) with a screen (identical in mesh size to the sump

strainer), top open (- 17 ft)

K Instrumentation for measuring differential pressures, flow rates, andtemperature

K System to inject a defined amount of debris

EPR C Aby ARE VA

> NRC Public Meeting January 27, 2010 7 AREVA

> Head loss testing protocol:

K Debris introduction system will accommodate debris sequencing

K Chemical precipitant addition will be performed

0 Bypass sampling will be performed

EPR:lo by AREVA

A> NRC Public Meeting January 27, 2010 8 AREVA

pr(SWiOUS Head Loss 7esting

D> Five tests were planned0 Clean strainer head loss

K Debris transport

" Design basis debris load

" Fiber only

K Thin bed

'EPR"byAREVA

A> NRC Public Meeting January 27, 2010 9 AREVA

> Facility scaling was selected at 9.4%, except for height whichwas 1:1 (within test apparatus limitation)

> Facility was constructed based on this scaling

AREVAA

> NRC Public Meeting January 27, 2010 10 AREVA

Heavy FloorSimulated Flow

Side Viewi

lo Heavy floor break flow simulated by flownozzles approximately 8 ft above thewater surface

No Simulated heavy floor break flowrepresents max. momentum flowachieved falling discharge distance

No Only retaining basket side facing straineropen for flow (via screen)

lo Model strainer takes up entire width offlume

Ni Flow guiding walls between retainingbasket and strainer to yield aconservative transport velocity betweenstrainer and retaining basket

lo The distance between model strainerand retaining basket at the minimumdistance in containment (scaled).

Walls provide smooth flow path-.between strainer and retaining

Flow nozzle simulating heavyfloor flow omentum

Top View

EPRby AREVA

under strainer

basket

AAREVA> NRC Public Meeting January 27, 2010

Previous Head Loss Testing

lo Debris was introduced directly into the retaining basket (RB)

lo During debris introduction, the water volume in RB rose

lo RB level continued to rise until it reached the test apparatusheight limit

Oo Test was terminated prematurely due to test apparatuslimitation

Head loss test facility will be re-designed andconstructed to incorporate full height RB

EPR Aby AREVA > NRC Public Meeting January 27, 2010

12 AREVA

Head Loss Test Faciity

Rewdesign

by -ARE I VA

1NRC

Public Meeting January 27, 2010 13 AREVA

Overview of Basket-strainerCombination

EPR >by AREVA

A14 AREVA> NRC Public Meeting January 27, 2010 1 R V

Auxiliary Piping and Features- I ~ ~

Debris Introauction rip e --Overhead Flow Nozzles -

R.B. Overflow Return ConduitMini-flow

Strainer Weiroverflow Weir C\

ENT[ 15 AREVA

by AREVA > NRC Public Meeting January 27, 2010

Retaining Basket Details

Debris Introduction Pipe-

Overhead Flow Nozzles

Retaining Basket Overflow Return Conduit -..... , /

Retaining Basket Camera -

Wing Wall Cameras-

- Scaled Retaining Basket Wall

Scaled Retaining Basket Floor

~144,

Wing Walls-

EP >nby AREVA

A16 AREVA> NRC Public Meeting January 27, 2010

Scaled Retaining Basket withOverflow Return Conduit

SIDE VIEW FRONT VIEW

16-7/16 16-7/16

3-3/16

37-11/16

Max WaterElevation

40-314

.. 16'- E2-7/8 28-3/4

28-3/4'-3-1/8" _

27

, 15-7187--7/8

-13/16"17'- 0"

m

36-7/8 -

EP >nby AREVA

A17 AREVA> NRC Public Meeting January 27, 2010 1 R V

Head Loss Test FacilityRe-design

),Changes to facility includeSteel constructionFull height RBModeling of RB floor screen surfaceDebris introduction systemImproved water level management plan

Head loss testing representative ofU.S. EPR design basis

EPR Aby AREVA > NRC Public Meeting January 27,2010 18 AR EVA

12/28

SensitivityStudies *

Facility Re-design andConstruction

ProposedNRC

Rby REVA':'.

> NRC Public Meeting January 27, 2010

2/19 2/26 3/12 4/222010 2010 2010 2010

Testing

I I

TestIReport ,

I I

TechnicalReport/RAIResponses

A19 AREVA