ML20101Q214
| ML20101Q214 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 12/14/1984 |
| From: | Root R WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-PT21-84, REF-PT21-85-040-000 GO1-84-0291, GO1-84-291, PT21-85-040-000, PT21-85-40, NUDOCS 8501070470 | |
| Download: ML20101Q214 (2) | |
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Washington Public Power Supply System P.O. Box 968 3000GeorgeWashingtonWay Richland, Washington 993520 372-5000 Ri12: pp Ah!Gn y'
' December 14, 1984 Responds to: NA G01-84-0291 Response required by: NA Mr. J.B. Martin Regional Administrator Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210.
Walnut Creek, Calif. 945 %
Subject:
NUCLEAR PROJECTS N0. 1 DOCKET N0. 50-460 REPORTABLE CONDITION 10CFR50.55(e)
EMERGENCY DIESEL GENERATOR PISTON SKIRTS
Reference:
Telecon, C.R. Edwards, Supply System to R.T. Dodds, NRC, same subject, dated November 19, 1984 In the noted reference, the Supply System informed your office of a reportable deficiency in accordance with the requirements of 10CFR50.55 (e). Attachment A provides a statement of the identified condition and a brief description of our planned actions to correct the identified deficiency.
Based on the identified actions in Attachment A, the Supply System consideres this as the final report.
If you have an questions or desire further information, please advise.
R. W. Roo, Jr.
WNP-1 Program Director (821)
RWR:LC0:pp Attachments cc:
'C.L. Ray, TDI Owners Group J.P. Laspa, BCI (862)
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Mani, UE&C (897)
E.C. Haren, UE&C (895)
NRC Document Control Desk, DC ORM (847)
FDCC (899)
BDCC (828) 8501070470 841214 ___
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ATTACHMENT A DOCKET N0. 50-460 REPORTABLE CONDITION PER 10CFR50.55(e)
EMERGENCY DIESEL GENERATOR PISTON SKIRTS DESCRIPTION.0F. DEFICIENCY The Supply System purchased two Emergency Diesel Generators for WNP-1 from Transanerica DeLaval Inc. (TDI).
TDI has reported, under the requirements of 10CFR Part 21, a deficiency associated with the method of heat treating the piston skirts, which may have left residual stresses.
The potential heat treating deficiency only applies to skirts manufactur-ed between December 1978 and October 1981.
Based on the original delivery dates the deficiency does not apply to the piston skirts installed in the engines.
However, two spare piston assemblies were procured at a later date, and based on the serial numbers, TDI has confirmed that these two spare piston assemblies were manufactured during this time frame.
Both engines and the spare assemblies are type AH piston skirts.
ANALYSIS.0F. SAFETY IMPLICATION The residual stress in combination with the operating stress could cause cracking of the piston skirt during operation, which could result in engine failure if undetected.
CAUSE.0F. DEFICIENCY According to TDI, the deficiency was caused by inadequate stress relief following fan cooling of the casting.
CORRECTIVE. ACTION The defective spare piston skirts have been documented on Supply System Nonconformance Report No.136 and will be shippeded to TDI in Oakland for an additional stress relief operation.
Following stress relief, the piston skirts will be returned to the Corporate warehouse where they will again be put in the spares inventory.
Receipt of the stress relieved piston skirts is expected by May 1, 1985.
ACTION.TO. PREVENT. RECURRENCE Implementation of the corrective actions will ensure availability of the engi ne.
TDI's program has already been corrected as the deficiency did not occur after October 1981. No further action is deemed necessary.