ML19332A063

Revised Final Deficiency Rept Re Incorrect Valve Weights in Upper Head Injection Sys.Addl Valves W/Erroneous Weights Listed.Piping Sys Load Analyses Were Rerun Using Correct Weights

ML19332A063
Person / Time
Site:	Sequoyah
Issue date:	09/02/1980
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:
References
10CFR-050.55E, 10CFR-50.55E, NCR-NEB-80-1, NCR-SQN-NEB-800, NCR-SQN-NEB-802, NUDOCS 8009100496
Download: ML19332A063 (3)

Text

a D 'vqTo 400 Chestnut Street Tcwer II September 2, 1980 Mr. Jaces P. O'Reilly, Director Office of . spection and Enforcement U.S. Nuclear 'leculatory Commission Regica n - Su\te 3100 101.Marietta St. et Atlanta, Cecrgia 70303 Cear lir. O'Reilly:

SLQLOYAH NUCLEAR PLANT UNIT 2 - COPES-VULCAN VALVE WEIGHT IMCCRFECT - !!CR 14ED co-1 A?iD liC.i SCN !!ED 6020 - SUPPLEMEhTAL 2!FCR;'ATION The cubject deficicncy was initially reported to NRC-OIE Inspector W. T. Cottle en January 11, 1980, in accordar.ce with 10 CFR 50.55(c) ac E R NEL 80-1. A final report ims submitted en February 11, 1960. We have air.cc determined that adcitional valves are affected by this noncenformance. Ihic nonconformance tas designated NC3 SC!l ?.EB 3020 end was repcrted to i:RC-CIE Inspectot* C. R. McFarland en July 10, 1980. At tnat time, we agrece to revise the final report en NCR NE3 80-1 to include tne additional valves. A wpolaca971 repcrt was suomitted on August 15, 1%0. hnclosec is ouc revised final report. Please note that TVA has renustered hCR :!EB dO-1 as NCR SCli AES C001.

If you have any queaticns, pleacc get in touch with D. L. L7tbert at FTS S37-2581.

Very truly yours, TENSFr.f,ER VALLEY AUTHORIIY L. !4. !! ills, !-Ianager

?;uclear Regulation 2M S? fey Lncio!.:ur e .

cc: ::r. Victer Steno, Director mr.cicture) THIS DOCUMENT CONTAINS Office of Ir:pecticn and Enforcement u.S. Nue war RcCu:atcry cc ciacier. POOR QUAllTY PAGES oazainsten, cC 20555 (30/9 31 y 8'0.0g1gy Q ( 3

E ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 2 COPES-VULCAN VALVE WEIGHTS INCORRECT

, NCR'S NEB 80-1 (SQN NEB 8001) AND SQN NEB 8020

. 10 CFR 50.55(e)

REVISED FINAL REPORT Description of Deficiency NCR NEB 80-1 (renumbered SQN NEB 8001) covered incorrect air-operated block valve weights used in the piping load analysis for the two-inch lines used to flush the UHI system check valves. There are two block valves per plant i unit, tag number 2-1A78RE, location numbers 9967 and 9985, located cutside the containment. The valves are supplied by Westinghouse and are manufatured by Copes-Vulcan. The valve weight specified on the Copes-Vulcan drawing is nominally 240 pounds, whereas the actual weight has been determined to be approximately 345 pounds.

NCR SQN NEB 8020 covers additional Copes-Vulcan valves in the UHI system having erroneous weights and correct weights as tabulated below. The incorrect weights were used in piping analyses similarly to those of the previous NCR.

Location Number Valve ID Incorrect Correct l (In Each Plant Unit) Number Weight /lbs Weight /lbs 9920 3/4 IA78RES 180 225 9933 3/4 IA78RES 180 225 9924 3/4 IA78RE 170 225 -

9925, 9966 3/4 IA78RE 170 225 9984A, 9984B 2 IA88RG 240 345

. 9914 1 IA78RE 170 230 1-HCV-123 1 RA78RE 200 139 (unit 2 only) 9961, 8097, 8252, 4 C42 130- 99 8279, 8440, 8796, 9179

, 9980A, 9980B, 8 C88 2450 902 9980C, 9980D 9981A, 9981B 12 C88 3500 1852

s c

Safety Implicaticns The loads determined in the pipin6 system analyses are used in specifying the piping supports. The erroneous valve weight could therefore have resulted in installed supports which would be inadequate to perform their required safety functions. The piping could have failed, resulting in lower UHI flow rates than were assumed in the plant safety analysis to mitigate a LOCA. .

Corrective Action The piping system load analyses were rerun using the correct valve weights.

The resulting new loads were then applied in the support calculations, and the existing supports were found to be' adequate to absorb the new loads. The supports, one on either side of each valve are of standard design and had _ sufficient overdesign in these applications for the new loads.

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