ML20009D142

Final Deficiency Rept,Originally Reported 810504,re Failure of Automatic Switch Co Solenoid Valve Ethylene Propylene Seals.Caused by Oil Entering Air Sys During Venting of Containment Isolation Valves.Investigation Conducted

ML20009D142
Person / Time
Site:	Susquehanna
Issue date:	07/07/1981
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, PLA-866, NUDOCS 8107230218
Download: ML20009D142 (3)

Text

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PPal TWO NO RTH NINTH STR'.ET, ALLENTO WN, PA.18101 PHONE: (215) 770 5151

- NORMAN W. CURTIS Mce President-Engineering & Constructlyt-Nuclear ,

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,,.o0 ~- l Mr. Boyce H. Grier J U L >' ~ og 1981 #

Director, Region I u.5 T$$$

U. S. Nuclear Regulatory Commission ',. ,

631 Park Avenue (6 King of Prussia, PA 19406 '/ / g g SUSQUEHANNA STEAM ELECTRIC STATION FINAL REPORT OF A DEFICIENCY INVOLVING FAILURE OF SOLENOID VALVE SEALS ERs 100450/100508 FILE 840-4/821-10 PLA-866

Reference:

PLA-749 (5/4/81)

Dear Mr. Grier:

This letter serves to provide the Commission with a final report of a deficiency involving the failure of Automatic Switch Company (ASCO) solenoid valve ethylene propylene seals. The condition was originally reported in PLA-749 and was the subject of NRC IE Information Notice

1. 80-11.

The attachment to this letter contains a description of the deficiency, its cause, safety impact and significance and the corrective action planned. This information is submitted in compliance with the provisions of 10 CFR 50.55(e).

We trust the Commission will find the information forwarded by this letter to be satisfactory.

Very truly yours, q

J N. W. Curtis Vice President-Engineering & Construction-Nuclear 3

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Attachment n107230218 G10707 l PDR ADOCK 06000387~ P E N N S Y LV A NI A POWER & LIG H T Co MPANY PDR S

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Mr. Boyce H. Grier July 7, 1981

,cc: Mr. Victor Stello (15) _, , . ,

Director-office of Inspection & Enforcement U. S. Nuclear Regulatory Commission .

Washington, D.C. 20555 Mr. G. Mcdonald, Director (1)

Office of Management Infor: nation & Program Control U. S. Nuclear. Regulatory Commission Washington, D.C. 20555 Mr. Gary'Rhoads U.-S. Nuclear Regulatory Commission P.O. Box 52 Shickshinny, PA 18655 I

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• Attachment to PLA-866

- Deficiency' relating to Automatic Switch Company (ASCO) solenoid valves.

_.DE C IPTION OF DEFICIENCY Th3 deficiency concerns a generic-problem with ASCO solenoid valves, model NP-1, which contain-internals that.are susceptible to swelling and deterioration when brought into contact with oils' (reference NRC IE Information Notice No. 80-11) .

This problem became apparent to PP&L when a number of ASCO solenoid valves installed rct its Susquehanna Plant failed due to oil contamination of the valve internals. The frilures occurred in the Reactor Building Chilled Water System where the solenoid valves ara used-to control:the operation of air - operated containment isolation valves. As a r: cult of the' solenoid valves failing, the associated containment isolation valves failed to close.

CAUSE

-Th3 cause.of the deficiency is due to oil, which-is used to lubricate the containment isolation' valve actuators, entering the air system during venting of the containment isolation valves. The' oil is bleeding back through the air system to the solenoid valves, resulting in the contamination of the solenoid valve ethylene propylene seals which results in subsequent valve failure..

' ANALYSIS OF SAFETY IMPLICATION Based upon a study of possible failure modes, and the actual failure sequences which htve occurred, PP&L has determined that failure of the ASCO solenoid valves could

-rcsult in a failure of the associated containment isolation valves to close upon receipt of a containment isolation signal.. Based upon a failure sequence of this nature, the deficiency,' had it gone undetected could have adversely affected the safety of plant operation, thus, the deficiency is considered reportable under the provisions of 10 CFR 50.55(e). ,

i i -CORRECTIVE ACTION BEsed on information provided in NCR IE Information Notice No. 80-11, an investigation to identify all ASCO solenoid valves susceptible to an oil environment has been conducted, and the corrective actions recommended in the notice have been initiated.

Twenty eight (23) such valves have been identified in the following safety and non-safety ralated systems:

Reactor Building Chilled Water Standby Gas Treatment Liquid Radwaste Collection Control Structure Heating and Ventilation Completion of the corrective action will be accompliLael by Bechtel Design Change Packages DCP-337 and DCP-390. PP&L NCR's have been written to identify and control the susceptible

-valve seals on Unit one valves which are turned over to PP&L.