ML19318C186

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Responds to IE Bulletin 79-28, Possible Malfunction of Namco Model EA180 Limit Switches at Elevated Temps. Top Cover Gaskets on Switches W/Applicable Date Codes Will Be Replaced on Valves Listed in Encl
ML19318C186
Person / Time
Site: Wolf Creek, Callaway, Sterling  Wolf Creek Nuclear Operating Corporation icon.png
Issue date: 06/02/1980
From: Petrick N
STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-79-28, NUDOCS 8007010162
Download: ML19318C186 (2)


Text

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a SNUPPS Standardised Nucieer Unit Power Plant System 5 Choke Cherry Road Nicholas A. Petrick Rockville, Merytend 20850 Executive Director June 2, 1980 SLNRC 80-26 FILE: 0278.10 SUBJ: IE Bulletin No. 79-28

r. Boyce Grier Director, Region I Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Docket Nos: STN 50-482, STN 50-483, STN 50-485, STN 50-486

Dear Mr. Grier:

This letter is submitted in response to the subject IE Bulletin for the SNUPPS Utilities, Kansas Gas and Electric Company, Union Electric Com-pany, and Rochester Gas and Electric Corporation.

An investigation concerning the planned use of NAMC0 EA180 switches on the SNUPPS plants has been completed. In several cases switches with date codes between 02-79 and 08-79 were identified. The enclosure to this letter lists the valves that contained these switches.

The Bulletin identifies sustained temperatures above 1750F as the cause of gasket failure. Under normal conditions on the SNUPPS plants, the switches will not be subjected to this high temperature environment.

Nevertheless, the top cover gasket of the switch will be replaced on the valves listed in the enclosure. Replacement will be completed prior to fuel load.

Ver truly yours,

-O%

Nicholas A. Petric -

RLS/jdk Enclosure cc: Mr. James G. Keppler, Director, Region III, USNRC Mr. Karl V. Seyfrit, Director, Region IV, USNRC Division of Reactor Operation Inspection, Office of Inspection and Enforcement, USNRC, Washington, D.C. 20555 8007010 [b

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Enclosure to SLNRC 80-Valves Containing NAMCO EA180 Switches with Date Codes Between 02-79 and 08-79 Callaway Unit #1 ya}yg, Jag,yuggg[ yest!ggggyse,yggge[

2 A8HV-011 8130 8881 2 ABHV-014 8133 8879A 2 ABHV-017 8135 8879B 2 ABHV-020 8823 8879C 2 AEFV-41 8824 88790 8825 8877A 8843 8877B 8890A 8877C 88908 8877D 8882 8880 Wolf Creek ya}yg, Jag,yygggr 1 ABHV-011 1 ABHV-014 1 ABHV-017 1 ABHV-D20 1 AEFV-42 i

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