ML20084F546
| ML20084F546 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 12/13/1971 |
| From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| 5416, NUDOCS 8304210165 | |
| Download: ML20084F546 (2) | |
Text
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Jersey Contral Pdwoh Light Company
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M ADISoN AVENUE AT PUNCH BOWL Ro AD e MoRRISToWN, N.J. 07960 e 539 6111
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December 13, 1971
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'N Dr. Peter A. Morris, Director Division of Reactor Licensing j
United States Atomic Energy Commission
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s Washington, D. C. 20545 y';
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Dear Dr. Morris:
Subject:
Oyster Creek Station Docket No. 50-219 Misoperation of Diesel Generator No. 1 Breaker The purpose of this letter is to advise you, as a matter of inte ertent closure of Diesel Generator No.1 breaker while the engine was at a standstill.
This incident occurred on September 9, 1971. At the time, the diesel generator had just undergone its annual inspection under the direction of a Gencral Motors' representative and was lined up for a test run before returning it to service.
An operator was instructed by the shift foreman to remove all tags, leave the generator breaker in,the racked down position, and give the engine an idle start. The shift foreman instructed the operator to first notify him in the event the General Motors' representative or our electrician vanted to place the generator on the line.
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The operator removed all tags and racked the breaker in and (as he later said because the General Motors' representative
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, told him he was going to put it on the line after running an idle
' test) instead of placing the engine " START-STOP" switch to " START",
l he inadvertently closed the generator breaker switch with the engine at a standstill. These two switches are approximately geighteen inches apart and on adjoining cubicles.
When the breaker was closed, it immediately tripped and probably was not closed for more than five cycles. The General g
Motors' representative along with our electrician made a complete.
j check of all electrical and mechanical components and found the
. A AL-following parts damaged: One diode in the exitation circuit and 7k, one selenium rectifier in the voltage regulator. The diode was aL L, replaced and a complete new voltage regulator was installed.
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o Dr. Peter A. Morris i
Page II December 13, 1971 Operational checks were made on all generator regulation l
circuits, a complete fast start sequence was performed and a normal one hour, eighty percent, load test was run prior to returning the generator to an operable condition.
All tests proved satisfactory.
The operator was instructed on the importance of obeying instructions and paying attention at all times whenever operating electrical switchgear.
I The safety significance of this event did not involve any nuclear safety considerations, but could have caused serious injury to the operator or other personnel in the vicinity of the generator j
breaker, exciter, or generator itself. This diesel generator was already considered inoperable as far as feeding any safeguards i
j systems, and the second diesel generator was being operated according to Technical Specification 3 7.c.2.
Twenty-five copies of this letter are enclosed.
1 Very truly yours, w a,,,. w o
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Ivan R. Finfr ek, Jr.
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Manager, Nuclear Generating Stations I
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ec: Mr. J. P. O'Reilly, Director i
Division of Compliance, Region I i
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