ML19345G164
| ML19345G164 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 05/09/1974 |
| From: | Hartley F CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| CYH-2655, NUDOCS 8103090786 | |
| Download: ML19345G164 (1) | |
Text
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CQNNECTICUT YANKGE ATOMIC POWER COMPANY C/
HADDAM NECK PLANT RR = 1. BOX 127E. EAST HAMPTON, CONN. o6424 May 9, 1974 CYH-2655
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'Y' Mr. James P. O'Reilly, Director U. S. Atomic Energy Commission
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Dear Mr. O'Reilly; As defined by Technical Specifications for Connecticut Yankee Atomic Power Station Section 5.3, the following information involving the momentary loss of voltage on Motor Control Center #5 is here-by reported.
480V Bus 5 lost voltage when #485 Station Service Transfomer faulted and 4850 breaker opened automatically. Upon loss of voltage on Bus #5 the power supply for MCC #5 shifted over normally to 480V Bus #6.
During the restoratian of affected equipment there occurred a momentary loss of voltage on MCC #5. The plants' operation was unaffected by this momentary loss and continued to operate at full power.
An investigation is being conducted and a written report will be submitted within ten days.
Very truly yours, l
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Plant Superintendent f
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