ML20002C502
| ML20002C502 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 05/17/1976 |
| From: | Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-76-02, IEB-76-2, NUDOCS 8101100380 | |
| Download: ML20002C502 (2) | |
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BIG ROCK POINT PLANT This letter is to provide a final response to IE Bulletin 76-02 regarding certain direct current relays manufactured by the General Electric Company.
A preliminary response was submitted April 19, 1976.
117 relays have been identified at the plant in both safety-related and nonsafety-(
related systems as defined by our "Q-List."
We have had no kncvn failures of any of these relays in direct current applications during the plant operating history. Relays, except CVX-1 and CVX-2 (see below) are physically located in areas where humidity and moisture are not likely to cause problems as described in Bulletin 76-02.
In addition, the $ relays in safety-related systems which have nylon spools are either energized more than 99% of the time or less than 1% of the time and thus not deemed susceptible to the failures as described in the bulletin.
Only five relays are in critical applications requiring nonfail-safe operation to cope with accidents as described in the FliSR. The evaluation of these relays is as follows:
Relay SVX-1 is in the containment vacuum relief cir uitry associated with the containment ventilation supply valvec. This relay is in the relatively dry control room, energized more than 99% of the time and failure could be identi-fled by inadvertant closure of the containment, ventilation supply valves which are open more than 99% of the time.
Relays CVX-1 and CVX-2 are located in containment in an area where moisture end temperature variations are relatively more extreme but tnese relays are contin-uously trickle current monitored by annunciator circuitry. Each is in a com-pletely redundant liquid poison firing circuit.
Relays 59X and 2TX are associated with the emergency diesel generator output cir-(
cuit breaker centrols. These are located in the relatively dry electrical equip-ment room and energized less than 1% of the time. Proper functidning of the 81011
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relays is necessary for satisfactory performance of periodic surveillance tests.
The diesel generator critical functions are backed up by other equipment.
Thus, based on our history of no failures, relatively good humidity environments, and evaluations of the five critical relays above, we have concluded that no relay replacements are required.
Ralph B. Sewell (Signed)
Ralph B. Sewell liuclear Licensing Administrator
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MR. JAMES G. KEPPLER CONSUMERS POWER COMPANY CC 5
76 JACKSON, MICHICAN R.B. SEWELL A ctTcn Onotonizto enop inevi r osiu Nuution or COr ets etcCesvr o i
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LTR. RE THEIR 4/19/76 LTR..................
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PROVIDING FINAL RE.$PONSE TO IE BULLITIN 76-02 RE CERTAIN DIRECT CURRENT RELAYS MFCD.
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