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TENNESSEE VALL-EY AUTHORITY CHATTANOOGA. TENNE~SSEE 37401

400 Owastmit Street Tower 11

April 13v, 1962

U.S. Nuclar Regulatory Comission29 b nciom 11 Attn: Hr-. James. P. O'Reill1y, Regional Admininitrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 e

Dea r I. O'Reilly:

0WIVI OF DISFECTION AND = FCS 0 1 DILWIMIN 81-02 AND SUPPLDUW 1, EII:JPO 50-390o -391, -438, -439, -566, -56T - VATTS BAR, DELLMEOTI AND !LIN CR3 UhCLEAR PLANTS

In response to your April 9, 1981 letter to B. G. Parris which transmitted OIR aiLletin 81-02, weprovided submittals on July 8 and October 21,, 1981. Our report dated November 25, 1981 consolidated the response for the original M3 81-02 and Supplement 1 which wms transmitted by your letter dated August 18, 1961 to B. 0. Parris. This was fofllowd by our combined response dated FeLrumry 11,, 1982.

Encosed we the results of our investigations for the Watts Bar, Bellefonate, and Yellow Creek Nuclear Plants. We anticipate transmitting additional information for our Watts Bar Nuclear Plant by July 28, 1982.

If you have any questions, please get in touch with R. B. Shell at 7T3 858-2688.

To the best of my knowledge, I declare the satements contained herein are

complete and true.

Very truly yours,

TEUIESSE VALLEY AUTHORITY

Nuclear Regfulation and Safety

I= osure cc: Mr'. Richard C. De~oung, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555

CL ~ ~~An Ul,,,AI Oprpi ttunitV nipoa g

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WATTS BAR, BELLEF0Wf K, AND uLLoW CREEK NWCLER PLanT 3W0 TO OLE BULLETI 81-02 AND SUPPLDMWr 1

FAILURE OF GATE-TYE VALVES To acz AMIXS MIU.EI~A PRESURE

Vats par- (nteria Report)

"1 18 aontimaing to Perform field mnodifications as described previously. "s lported Under SCO 3793R, per 10 CPR 50.55(e), Westinghouse believes that the failure at the Llidtorque motor opertor~s on three gate valves subseuu to the modificatiats is a materials% problem. Viestingbouse is Oontiiiang the investigation via Field Deficiency Report number WATM-lO 165. Our final report on this matter will be provided upon receipt of revised drawing and field change notices from Vqstingtaouse.

Our next report an this bulletin for Watts Bar wili be submitted in conjunction with our next report on NK8 WBN NB 8013.

Bellefonte (Final Report)

Uwne at the Potentially deficient valves are being supplied on the Bellefonte 3VMS contract. Below is a listing of Borg Warner (NYD) valves supplied for Bellefonte Nuclear Plant which were subject to potential failure as identified in IEB 81-02 and Supplement 1.* The operating conditions at Bellefonte are substantially less severe than the conditions which resulted in the component f~ailure described in lEB 81-02. The manufacturer has shown by test that these valr'es will perform satisfactorily when subjected to the service conditions for which they will be used. Consequently, these valves could not have failed and adversely affected plant safety. Therefore, the valves are acceptable for use as is and no modification or repairs we necessary. For mor detailed information refer to TVA's revised final report on nonconformance reports (IC~s) 0020 and BULISE 8005 which was filed in a letter from L. K. Mills to J. P. O'Reilly dated September 24, 1981, pursuant to the requirements of 10 CPR 50.55f~e).

TWA TVA So-vice Valve Function NiD P/I Contract No. Mark go. Conditions

Component Cooling 79190 77K38-86163-8 3BWO456- 2500 lb/in 2

Sys - Eqpt Isal KC-30 * 650F & 100 spa

Letdown Long-Term - 77K38-86163-8 3RU04i13- 2500 lbin 2

Cooling Isolation MD-65 0 670 F& 500wp

The above-listed valves are the only valves of this type that have been fu.rnished to TVA for any nuclear plant.

Yellow Creek Nuclear Plant (Final Reoort)

TVA has determined that none of the potentially deficient valves identified in the original IEB 81-02 or Supplement 1 to this bulletin have been or will be furnished for Yellow Creek Nuclear Plant.