ML20084F080
| ML20084F080 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 02/07/1972 |
| From: | Amish K ROCHESTER GAS & ELECTRIC CORP. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084F071 | List: |
| References | |
| NUDOCS 8304200048 | |
| Download: ML20084F080 (1) | |
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RD(J!ES TEi: GA$ bevD ELECTRIC CCRFORA TICN e 39 EAS~ AVENUE POCHESTC
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.l February 7,1972
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Dr. Peter A. Morris, Director g
p Division of Reactor Licensing U. S. Atomic Energy Commission ICU Washington, D. C. 20545 0
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Subject:
Detection of faulty relay during surveillance te Q [%[r it
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R. E. Ginna Nuclear Power Plant Unit No. I s
Docket 50-244
Dear Dr. Morris:
On January 31, 1972 while conducting the routine monthly PT 5.2 Sur-veillance Test (Periodic Test - Undervoltage and Underfrequency Pro-tection) an underfrequency relay on the 4160 Kv bus No.11B failed to transmit a signal to the logic racks when a fault condition was being simulated. This failure defeated one of the two channels of redundancy provided for underirequency protection of this bus.
The Plant Operations Review Committee met immediately and approved the removal of the inoperative device (811/11B) from the drawout drawer and its replacement with a tested spare.
The test was then rerun in entiroty and completed successfully as it did on the prior monthly test 01 Decemi'er 28, 1971.
Examination of the removed rela, cis-losed a faulty capacitor which was m elaced. The unit then nerformed norma!!y under several tests and it was returned to stock.
Very truly yours,
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