ML20084C526
| ML20084C526 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/11/1974 |
| From: | Ross D JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-50-219-74-50, NUDOCS 8304080090 | |
| Download: ML20084C526 (3) | |
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7m Jersey Central Power & Light Company ? W'{
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MADISON AVENUE AT PUNCH BOWL ROAD e MORRISTOWN, N.J.07900
- 201539-6111
.a.a., r-o.neral Public Utikties Corporation.
October 11, 1974 1 A 9
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Mr. A. Giambusso s
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Deputy Director for Reactor Projects Directorate of Licensing
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United States Atomic Energy Commission
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Dear Mr. Giambusso:
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Subject:
Oyster Crock Statien Docket No. 50-219 Abnormal Occurrence Report No. 50-219/74-50 The purpose of this letter is to forward to you the attached Abnormal Occufrence Report in compliance with paragraph 6.6.2.a of the Technical Specifi-cations.
d Enclosed are forty copics of this submittal.
Vo truly yours,
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~ W Donald A. Ross Manager, Nuclear Generating Stations Pk Enclosures cc: Mr. J. P. O'Reilly, Director directorate of Regulatory Operations, Region 1 4 om j L o s.
8304080090 741011 PDR ADOCK 05000219 S
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OYSUIR CREEK NUCLEAR GENERATING STATION
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t FORKED RIVER, NEW JERSEY 08731 Abnormal Occurrence Report No. 50-219/74-50 Report Date October 11, 1974 Occurrence Date October 4, 1974 Identification of Occurrence Violation of the Technical Specifications, paragraph 3.5. A.1, failure of cleanup system DC isolation valve V-16-14 to close. Viis event is considered to be an abnormal occurrence as defined in the Technical Specifications, paragraph 1.15B.
Conditions Prior to Occurrence The plant was at steady state power with the following major parameters:
Power:
Reactor,1905 FMt Electric, 655 FMe 4
Flow:
Recirculation, 15.8 x 10 gpm 6
Feedwater, 7.25 x 10 1b/hr Reactor Pressure:
1020 psig Stack Gas:
15,550 pCi/sec Description of Occurrence t
At 0830 on October 4,1974, while attempting to isolate the cleanup system for maintenance, it was found that cleanup system DC isolation valve V-16-14 failed to close electrically, Cleanup system AC isolation valve V-16-1 had previously closed normally. Electrical Department personnel were then dis-patched to the motor control center for V-16-14.
An investigation revealed i
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- Abnormal Occurrenes-acport No. 50-219-74-50 Page 2 l' i i
that the are horn on contactor 2Bc.was bent and restraining the moving
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contactor in its closing motion.
When the are horn was tapped, the moving
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contactor was freed and V-16-14 subsequently closed.
Ij-Apparent Cause of Occurrence l
The investigation into the bending of the 2B are horn did not determine c
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the cause of the occurrence.
The specific cause is, therefore, still j
undetermined.
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Analysis of Occurrence i
a The safety significance of this event is the loss of cicanup system isolation i
I valve redundancy. Ilad a loss of coolant accident occurred generating a low-low reactor water level signal, V-16-1 would have closed to isolate the cleanup j
system.
Corrective Action i
Immediate corrective action involved replacing the are horn on the 2Bc con-tactor. Additional corrective action involved inspecting the are horns on i
all DC contactors in the same motor control center. None of these are horns j
were found to be bent.
j Failure Data 1
Basic DC contactor data are as follows:
bbnufacturer - General Electric Company 600V - 25 amp Identification No. - IC28001607 - F3G l
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