ML20069E450

Final Deficiency Rept Re Significant Deviation from Performance Specs for Sor,Inc Pressure Switches Installed as Part of ECCS Interlock Mod.Initially Reported on 830216. All Leaking O-rings Replaced

ML20069E450
Person / Time
Site:	LaSalle
Issue date:	03/16/1983
From:	Schroeder C COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, 6214N, 83-02, 83-2, NUDOCS 8303220056
Download: ML20069E450 (2)

Text

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2 N Commonwealth Edison

/ One First Nitionti Plaza Crucago, Ilknois

. O Address R ply to: Post Olfice Box 767 Chicago. lltinois 60690 March 16, 1983 Mr. James G. Keppler, Director Directorate of Inspection and Enforcement - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

LaSalle County Station, Unit 2 10CFR50.55(e) Notification 83-02 Final Report, SOR, Inc. Pressure Switches NRC Docket No. 50-374

Dear Mr. Keppler:

Commonwealth Edison notified your office on February 16, 1983 o f a deficiency in accordance with 10CFR50.55(e) concerning a significant deviation from performance specifications for the SOR, Inc. pressure switches installed as part of the ECCS interlock modification. The GE part number for these switches is #219B4965P004.

Eight switches were installed on Unit 1 as part of the delta P interlock modification late in 1982. Af ter hydrostatic test of Unit 1, four of the eight experienced failure due to the 0-ring seal allowing water to enter the electrical portion of the device. Further testing by the station on the eight Unit 2 devices (not installed) yielded two additional switches which had the apparent inability to seal at reactor pressure (1120 PSI). These additional eight were tested on nitrogen, not water.

GE has been working with SOR to determine cause of failure.

Determination to date indicates that the 0-ring material used in the failed pressure switches did not have sufficient curing. We anticipate a failure report to be issued by SOR, Inc. in early April.

All of the leaking 0-rings have been replaced with new 0-rings under the direction of a SOR field representative. The SOR Pressure Switches were then tested and found to have no leakage.

8303220056 830316 PDR ADOCK 05000374 PDR S

MAR 171993 W 47 ,

s' J. G. Keppler March 16, 1983 From the above, we conclude that the plant is operable because the SOR Pressure Switches in the ECCS systems have been tested and performed as required.

If you or your staf f have any questions concerning this problem please contact us at this office.

Very truly yours, 3 llL) E3 C. W. Schroeder Nuclear Licensing Administrator 1m cc: Director of Inspection and Enforcement - Washington, D.C.

NRC Resident Inspector - LSCS I

2 6214N i

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