ML20202F196
| ML20202F196 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 07/01/1986 |
| From: | Holmberg B WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-PT21-86, REF-PT21-86-242-000, REF-PT21-C GO1-86-0101, GO1-86-101, PT21-86-242, PT21-86-242-000, NUDOCS 8607150110 | |
| Download: ML20202F196 (2) | |
Text
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Cs WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 968
- 3000 George Washington Way
- Ricialand, Wasisington 99352 July 1, 1986 G01-86-0101 Docket No. 50-460 Mr. John B. Martin Regional Administrator, Region V U. S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596
Subject:
NUCLEAR PROJECT NO 1 POTENTIALLY REPORTABLE CONDITION 10CFR50.55(e)
EMERGENCY DIESEL GENERATOR LUBE OIL TANK FOOT VALVE During an unannounced site inspection on June 17, 1986, Mr. C. R. Edwards of the Supply System notified Mr. Bill Ang of the NRC of a potentially reportable deficiency, in accordance with the requirements <
of 10CFR50.55(e). Attachment 'A' provides a statement of the identified t condition and a brief description of our planned actions to correct the identified deficiency. Based on the construction status at WNP-1, the Supply System will not be able to issue a final report at this time. An update will be provided at construction restart.
If you have any questions or desire further information, please advise, i b B. A. Ho berg , WNP-1 Program Director (821)
BAH:LC0:pd Attachment cc: A. D. Edmondson, UE&C (898)
C. C. Haren, UE&C (895)
NRC Docunent Control Desk, Washington, D. C.
FDCC B607150110 860701 PDR ADOCK 05000460 S PDR
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Attachment 'A' DOCKET NO. 50-460 POTENTIALLY PIPORTABLE CONDITION PER 10CFR50.55(e)
EMERGENCY DIESEL GENERATOR LUBE OIL TANK FOOT VALVE DECSRIPTION OF DEFICIENCY The Supply System's WNP-1 Project utilizes two Emergency Diesel Gener-ators from Transamerica Delaval, Inc. (TDI) as its emergency power supply source. TDI recently issued a 10CFR Part 21 report concerning a poten-tial problem with the lube oil sump tank foot valve. There are four foot valves covered by this report; one on the normal pump suction and one on the redundant pump suction supply for each of the two diesel generator units.
During a maintenance inspection at a nuclear plant, the elastomer lining in a foot valve was found in pieces. The foot valve is manufactured by Clearflow Company of Berkeley, California.
ANALYSIS OF SAFETY IMPLICATION The disintegration of the liner could cause a restriction in the valve, preventing flow of oil to the lube oil pump or the liner pieces could flow upstream, lodging in and damaging the lube oil pump. Either failure mechanism will cause a loss of lube oil to the engine, affecting engine availability.
CAUSE OF DEFICIENCY Initially, the deficiency was attributed to deteriorating materi al .
However, the final investigation by TDI revealed that the valve was being overpeessurized, causing extrusion of the liner material. The overpres-surization condition is caused by operation of the redundant lube oil pump system.
CORRECTIVE ACTION TDI is continuing to investigate and has not yet recommended any correc-tive action measures.
ACTION TO PREVENT RECURRENCE Lorrection of the foot valve deficiency will ensure that the WNP-1 engines are acceptable for operation. No further action is deemed necessary.
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