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GPU Nuclear

U M d e own Pennsylvania 17057717-944-7621Writer's Direct Dial Number:

August 3,19825211-82-182

Mr. R. C. HaynesRegion I, Regional AdministratorU. S. Nucicar Regulatory Commission631 Park AvenueKing of Prussia, PA 19406

Dear Sir:

Threa !!ile Island Nuclear Station, Unit 1 (TMI-1)Operating License No. DPR-50

Docket No. 50-289IE Bulletin 82-02

In accordance with IE Bulletin 82-02, this letter transmits our response toitems 3 and 5 of the subject bulletin. Item 1, 2 and 4 will also be reportedin accordance with the instructions of the. subject bulletin.

Attachment A identifies those bolted closures of the Reactor Coolant PressureBoundary (RCPB) tiwt have experienced leakage with the resultant inspectionsmade and corrective measures taken to eliminate the leakage. This attachmentresponds to Item 3.a of the subject bulletin with the exception of DH-V1.

Attachment B identifies the RCPB closures and connections where fastenerlubricants have been or are being used and the lubricant's composition.Our experience with these lubricants has been satisfactory. This attach-ment responds to part of item 3.b of the subject bulletin.

Attachment C describes the only RCPB closure where injection sealant materialhas been used (DH-V1) and the sealant's composition. Our experience has beensatisfactory with the sealant materials which we have used. This attachmentcompletes our response to items 3.a and 3.b of the subject bulletin.

Sincerely,

\-

H. D. I killDirector, TMI-l

HDH:CJS:vj fAttachmentscc: R. Conte

Sworn and Subscribed to before me this 3rd day of Auguet , 1982.

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ATTACHMENT A Page 1 of 2,

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Bolted Closures of The RCPB at TMI-1 That have Experienced Leakage,

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- Closure Approx. Mode of Inspections Made toDate of Failure Eliminate' Leakage Corrective Measures TakenRepair

"B" Steam 3/79 Gasket Fail- Visual inspection of gasket Replaced corroded stud with a oversize stud,Generator Lower ure seating surface, gasket back- (threads were damaged when an attempt was madePrimary Hand" ing plate and handhole cover. to remove the wasted stud) verified correcthole replacement Flexicallic gasket and retorqued

handhole cover. Visual inspection of handhole,

at 2285 psig leak test pressure during HotFunctional Testing (July, 1981) showed noevidence of leakage.

"A" Steam 3/79 Slight leak- Visual inspection of gasket Yarified correct replacement FlexitallicCenarator Lower age observed, seating surface, backing plate gasket and retorqued handhole.Primary Hand- no obvious . and headhole cover.hole failure mode

10/80 Same as Visual inspection of gasket Verified correct replacement Flexitallicabove seating surface, backing plate gasket and retorqued handhole. Visual inspection

and handhole cover. of the handhole at leak test pressure at2285 psig during Hot Functional Testing (July1981) showed no evidence of leakage.

"A" Steam 8/80 Same as Visual inspection of gasket Verified correct replacement FlexitallicGenerator Lower above seating surf ace, gasket back- gasket and retorqued manway. Visual inspectionPrimary Manway ing plate and man way cover, at leak test pressure of 2285 psig showed no

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evidence of leakage during Hot FunctionalTesting (July 1981).

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7/81 Slight leak- Manway cover, gasket seating To be determined based upon dimensionalage observed, surface and backing cover flat-~cvaluation of the closure,no obvious ness checks and dimensionfailure mode. tolerance checks in processLeakage stop- of being taken and evaluated,ped at >500

'psig.

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. ATTAQIMENT A Page 2 of 2 ,

Bolted Closures of The RCPB at TMI-l That Have Experienced Leakage,

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closure Approx. Mode of Inspections Made toDate of Failure Eliminate Leakage Corrective Measures TakenRepair , ,

CRD No. 68 4/82 Slight leak- Visual inspection of gasket Replaced flexitallic gaskets, studs andNozzle Flangej, age observed, seating surfaces, bolting segments and retorqued closure.

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to Reactor' no obviousVessel' failure mode.

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ATTACRMENT B Page 1 of 1

RCPS FASTENER LUBRICANTS

Closure Lubricant Composition of Lubricant'

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Steam Generator Molykote C-Rapid Molybdenum disulfide and other solid lubricants

Primary Manway & Spray in a special grade mineral oil.

InspectionOpenings

Pressurizer Man- Molykote C Molybdenum disulfide and white solid lubricantsway Cover in a mineral oil.

CRDM Reactor Molykote C Same as above.Vessel NozzleFlange

RC Relief Valves Never-Seez Compound Finely divided metallic particles in a specialhydrocarbon carricr.

Fel-Pro N-1000 Copper and graphite Flakes in a petroleum carrier.

RC Pump Main Fel-Pro N-1000 Same as above.Flange Bolts

RC Pump Lower Neolube liigh grade graphite particles in thermoplastic

Seal llousing resin and isopropanal.Cap Screws

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ATTACHMENT C

DH-V1 letdown (first isolation valve from the hot leg of the Reactor, Coolant"B". Loop) has experienced pressure seal ring leakage. DH-V1 is a 12 inch,type 316 stainless steel pressure-seated gate valve manufactured by theWalworth Company. Following stem replacement during Spring 1976 Refueling :Outage, DH-V1 developed a leak (0.2-0.5 gpm) past the pressure seal ring

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gasket as evidenced:by-leakage up through the threads between the retainingring and the valve. body. _During' November 1976 nuclear grade Furmanitewas injected and successfully stopped the leakage. The Furmanite compound hasa Nitrile rubber base. Testing of the nuclear grade _ compound was performed andthe following levels were-determined:

Total Leachable

Sodium 0.175 mg/gm 0.080 mg/gmChloride J '. 39 mg/gm- 0.008 mg/gmLead 0.022 mg/gm 0.005 ug/gmZinc .114.37 mg/gm. _0.053 mg/gm.Fluoride <l.7 ug/gm- <l.7 ug/gmSulfur- <.01% <.01%

Since the initial injection, there has been an additionalinjection of Furmanite(October,1981) using a compound with lesser contaminent levels than used in -1976. The analysis of the second injection of Furmanite was:

Total Leachable-

Chlorine '38 26-Flourine 11 <1Sulfur (As S) 14 <2Antimony * 70.03

7_0.03Arsenic *

Cadmium * <0.03-I.ead * 70.3Tin * 73Zinc * 70.05Mercury * 0.002-

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NOTE: Results in microgram / grami

I * Not Measured;

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