ML19224D327
| ML19224D327 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 05/04/1979 |
| From: | Novarro J LONG ISLAND LIGHTING CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| SNRC-384, NUDOCS 7907110395 | |
| Download: ML19224D327 (2) | |
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LONG ISLAND LIGHTING COM PANY M fLtCC Cma:wfgfug SHOREHAM NUCLEAR POWER STATION P.O. BOX 618, NORTH COUNTRY ROAD e WADING RIVER. N.Y.11792 May 4, 1979 SNRC-384 Mr. Boyce Grier Office of Inspection & Enforcement Region I U.S.
Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 LONG ISLAND LIGHTING COMPANY Shoreham Nuclear Power Station - Unit 1 Docket No. 50-322
Dear Mr. Grier:
NRC Inspection & Enforcement Bulletin No. 79-09 dated April 17, 1979, required an inspection of General Electric type AK circuit breakers.
This inspection was required due to failures of this type breaker in safety related systems.
Failure of the breakers to trip as required during undervoltage conditions was caused in part by inadequate preventive maintenance on the breaker trip shaft mechanisms.
A review of the Shoreham design has indicated that none of the type AK breakers as described in the Bulletin have been used in any of the NSS or BOP safety related systems.
The Shoreham design does utilize General Electric type AK-F breakers as field breakers for the Main Generator and for the Recirculation Pump Motor Generator sets.
These breakers are non-safet~ related and utilize a shunt-trip device.
Although the trip initiating devices for these breakers are different (shunt-trip vs. undervoltage), excessive trip shaft torque re-quirements caused by conditions as described in this Bulletin could prevent the tr'pping of the breakers.
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ht t t ort s 369 l00 F C.893 5
SNRC-384 hk. Boyce Grier May 4, 1979 Page 2 A copy of this Bulletin and associated General Electric Service Advice Letter shall be forwarded to Plant Staff for incorpora-tion of the applicable corrective actions into the plant main-tenance procedures.
Very truly yours, t v c J.
P.
Novarro Project Manager Shoreham Nuclear Power Station MAG : j v cc:
Mr-John G.
Davis, Director Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
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