ML19350C916
| ML19350C916 | |
| Person / Time | |
|---|---|
| Site: | Yellow Creek  |
| Issue date: | 03/31/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81-397-000 10CFR-050.55E, 10CFR-50.55E, NCR-YC-100, PT21-81-397, PT21-81-397-000, NUDOCS 8104100211 | |
| Download: ML19350C916 (3) | |
Text
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TENNESSEE VALLEY AUTHOR!TY r 3@[ddd CH ATVANOOGA. TERNESGCE 37401 400 Chestnut Street Tower II March 31, 1981
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Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Stre$t Atlanta, Georgia q03
Dear Mr. O'Reilly:
YELLOW CREEE NUCLEAR PLANT UNIT 1 - DEFICIEh
- NCR YC-100 - FINAL REPORT
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M. Thomas on October 8,1980, in accordance with 1 This was followed by our interim reports dated November 6 February 5,1981.
1980, and applicable to this deficiency. Enclosed is our final mport.
We consider 10 CFR 21 D. L. Lambert at FTSIf you have cny questions concerning this matter, please 857-2581.
ouch with Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Enclosure Mr. Victor Stello, Jr., Director (Enclosure) oc:
Office of Inspection and Enforcement i
U.S. Nuclear Regulatory Cocaission Washington, DC 20555
.I i
r An Equal Opporturuty Employer
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.A 45 ENCLOSURE YELLOW CREEK NUCLEA'R PLANT UNIT l' DEFICIENT WELDS ON GAS STRIPPER MODULE NCR YC-100 10 CFR 50.55(e)
FINAL REPORT Description of Deficiency During installation of the gas stripper pump module (GSPM) at Yellow Creek Nuclear Plant, a TVA welding inspector noticed several weld,
deficiencies. For example, fillet welds were found to be undersized with some visible porosity.- There also appeared to be a lack of
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penetration on butt welds. Arc strikes were visible. The GSPM is manufactured by Norwalk Fabricators.
It was purchased by TVA from Combustion Engineering.
Safety Implications The failure of the gas stripper pump module c'ould. result 'in release of radioactive gaseous fission products (most notably the noble gases) through the ventilation system. This condition could adversely affect the safety of plant operations.
Corrective Action On March 17, 1981, representatives of Norwalk Fabricators, Combustion Engineering, and TVA met in Windsor, Connecticut, to finalize an approach to making repairs. It was decided that Norwalk Fabricat' ors would supervise the removal of all piping that was joined together by.
welds which did not meet the requirements of the applicable ASME Code.
All of the re' moved piping is to be returned to Norwalk for repairs.
This work will be completed by May 15, 1981.
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