ML20087L112

RO 75-2:on 750224,test of Containment Purge Inlet & Exhaust Valves Closing Time Disclosed That Valves 1CV-3212 & 1CV-3244 Exceeded 3-5 Min Closing Time.Caused by Sticking Pneumatic Relays in Valve Air Operators

ML20087L112
Person / Time
Site:	Point Beach
Issue date:	02/04/1975
From:	Burstein S WISCONSIN ELECTRIC POWER CO.
To:	Case E Office of Nuclear Reactor Regulation
References
RO-50-266-75-2, NUDOCS 8403270036
Download: ML20087L112 (2)

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Wisconsin Electnc eomcoww 231 WEST MICHIGAN, MILWAUKEE, WISCONSIN 53201 ..

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February 4, 1975 Mr. Edson G. Case, Deputy Director Directorate of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Case:

DOCKET NO. 50-266 LICENSEE EVENT REPORT NO. 50-266/75-2 CONTAINMENT PURGE AND E'UIAUST VALVE CLOSING TIMES GREATER THAN FFDSAR LIMITS UNIT NO. l'- POINT BEACH NUCLEAR PLANT This is filed in accordance with Section 15.6.6.A.3.b of the Point Beach Nuclear Plant Technical Specifications.

On January 24, 1975, during a Unit 1 shutdown, we conducted a test of the containment purge inlet and exhaust valves closing times in accordance with our letter to you of January 8, 1975. This test disclosed that valves 1CV-3212 and 1CV-3244 had closing times which exceeded the three-second minimum closing time described in Section 5.3.2.3 of the Final Facility Description and Safety Analysis Report. As described in our January 8 letter, a similar problem was experienced with the Unit 2 containment purge and exhaust valves which were tested during the recent Unit 2 refueling outage.

On January 24, 1975, a maintenance request was submitted to investigate and repair, as required, valves 1CV-3212 and 1CV-3244. The maintenance investigation disclosed that the longer-than-required closing times for these two valves were more specifically linked to sticking pneumatic relays in the.

valves air operators. These pneumatic relays were cleaned and lubricated and the valves were retested with satisfactory closing times. The results of all four valve tests are as follows:.

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.. . .. .o o Mr. Edson G. Case February 4, 1975' Closing Time Prior Closing Time After To Relay Cleaning Relay Cleaning Valve No. (Seconds) (Seconds) 1CV-3212 3.6 2.0 3213 2.8 2.8 3244 4.2 2.0 3245 2.0 2.0 During normal operation at Point Beach Nuclear Plant, containment venting is accomplished by a continuous venting and monitoring system completely separate from the purge inlet and exhaust valve system. Therefore, after closing the above valves to establish containment integrity, there is not normally any need to reopen them while at power. Accordingly, it is' considered that the slower closing time of the valves posed no hazard to the health and safety of the public.

Very truly yours, . _

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f Executive Vice President Sol Burstein 1

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