ML20069F682

Final Significant Const Deficiency Rept Re Corrosion Inhibitor Effects on Solder Used to Stake Locking Nuts on Thermostatic Valve Override Assemblies.Initially Reported on 820702.Locking Nuts Fitted W/Swaged Locking by 821126

ML20069F682
Person / Time
Site:	Hope Creek, 05000355
Issue date:	09/15/1982
From:	Martin T Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8209280201
Download: ML20069F682 (2)

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Thornas J. Martir. Public Service Electric and Gas Company 80 Park Plaza Newark, N J. 07101 201/430 8316 Vice President Engineering anu Construction September 15, 1982

> ~~ - Mr. Ronald C.- Haynes ,- Adminis trator- -' --

U. S. Nucicar Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Haynes:

POTENTIAL CONSTRUCTION DEFICIENCY EMERGENCY DIESEL GENERATORS HOPE CREEK GENERATING STATION On July 2, 1982, a verbal report was made to Region I, Office of Inspection and Enforcement representative, Mr. R. Keimig, advising of a potential significant construction deficiency concerning the deleterious effects corrosion inhibitors may have on solder used to stake locking nuts on thermostatic valve override assemblies. An interim report on this matter was sent to your office on August 2, 1982. The following information is provided in accordance with the requirements of 10CFR50.55 (e) .

It has been determined that the corrosion inhibitor intended for use in the emergency diesel generator cooling system could i dissolve the solder which locks the thermostatic valve adjust-ment nut in place. The loss of the nut would leave the thermo-static valve in the open position. This could lead to a " cold engine" condition which could have prevented the engine from starting within the specified time limit. Over extended periods of time, it could also have led to premature cylinder scuffing and possible piston seizure.

Had this gone undetected and uncorrected there was the potential for loss of one or more of the four standby diesel generator sets. These units are safety related and supply power to engineered safeguard equipment and other safety related equipment

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D209280201 B20915 PDR ADOCK 05000354 12 G PDR

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R. C. Haynes 2 9/15/82 required for safe shutdown of the plant, in the event offsite power is not available.

It has been determined, therefore, that this condition is reportable in accordance with 10CFR50.55 (e) .

To ensure that the above sequence of events will not occur, the Robertshaw valves on all diesels will be provided with swaged locking on the adjustment nut. This will ensure proper valve

>- - w~-operation Jfhis-remedialecotrion-de ccheduled for--completion by- .-

November 26, 1982.

Very truly yours,

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cc: Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D. C.

NRC Resident Inspector - Hope Creek P. O. Box 241 Hancocks Bridge, NJ 08038 d

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