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MADISON AVENUE AT PUNCH BOWL ROAD
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- Mr. A. Giambusso f,
IC Deputy Director for Reactor Projects Directorate of Licensing United States Atomic Energy Cottission i
Washington, D. C. 20545 Dear iir. Gloulu ud o u.
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Subject:
Oyster Creek Station i
Docket No. 50-219 i
Abnormal Occurrence Report No. 50-219/74/28 The purpose of this letter is to forward to you the attached Abnormal occurrence Report in compliance with paragraph 6.6.2.a of the Technical Specifications.
Enclosed are forty copies of this submittal.
Very truly yours,
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Donald A. Ross Manager, Nuclear Generating Stations es Enclosures cc: Mr. J. 'P. O'Reilly, Director
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~ Directorate of Regulatory Operations, Region I
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9604240258 960213
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. OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, NEW JERSEY 08731 4
Abnormal Occurrence Report No. 50-219/74/28 Report Date i
April 26,'1974 Occurrence Date April 19, 1974
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Identification of Occurrence lViolationoftheTechnicalSpecifications, paragraph 3.4.A.1,whichrequires the core spray system to be operable at all times with irradiated fuel in the
. reactor ' vessel, except as specified in Specification 3.4.A.3 and 3.4. A.4.
Suction valve (V-20-4) to the "B" core spray pump was stuck in the closed position for a period of approximately 15 minutes, thereby causing a loss of core spray pump redundancy in system II.
In addition, core' spray system I was tagged out of service for maintenance at this time.. This event is considered 3
to be an abnarmal occurrence as defined in the -Technical Specifications, i~
paragraph 1.15B and D.
Conditions Prior to Occurrence The plant was: shut down for refueling.
The reactor mode switch was in the REFUEL position with reactor coolant tem-perature approximately 104'F.
Description of Occurrence At approximately 0715 on April 19, 1974, while performing surveillance testing on core sprey system II, motor-operated valve V-20-4 failed to open electrically after having closed. electrically in the normal manner. This surveillance test-
. ing was being performed on core spray system II after system I was tagged out of service.for maintenance.
(Hydraulic shock and ~ sway arrestur units were being-replaced on components of system I.)
V-20-4 was manually opened approximately 15 minutes after this valve problem was identified.
Apparent Cause of Occurrence
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1he apparent cause of this occurrence has not been identified at this time.
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- Abnormal occurrence No. 50-219/74/28 Page 2
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Analysis of Occurrence
- Motor-operated valve V-20-4 provides suction to the "B" core spray. pump'in-core spray system II. This valve is normally-maintained in the open position.
- Had' core spray system operation been required, the "B"~ core spray pump would have. functioned.normally both before performance of the surveillance testing and after the valve was locked in the open position. ' The. safety significance
- of this event is that for a period of approximately 15 minutes, core spray pump redundancy was lost in system II. Since system I was tagged out of service during this time. period, a further degradation in core spray system I
capability resulted.
Corrective Action
- Immediate corrective action involved manually opening the motor-operated valve (V-20-4) and tagging open the associated circuit breaker to prevent subsequent closing.: Additional corrective ~ actions will be determined following the completion of the investigation into the cause of this event and a review of the surveillance requirements for this valve will be performed.
Failure Data 1
The cause for this failure has not been identified at this time.
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