ML19260B159

LER 79-037/03L-0:on 791103,during Monthly Surveillance Test, Core Spray Booster Pump NZ03B Failed to Start.Pump Breaker Control Power Fuse Checked.Caused by Loose Fuse.Fuse Clip Tightness Checked & Fuse Replaced

ML19260B159
Person / Time
Site:	Oyster Creek
Issue date:	11/30/1979
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19260B157	List: ML19260B156 ML19260B159
References
LER-79-037-03L, LER-79-37-3L, NUDOCS 7912070340
Download: ML19260B159 (3)

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a 2l l On Novemler 3. 1979. durina a reaular monthly surveillance test _ core 0 13 I spray booster pump NZO3B did not start. The pump had properly started I o 4 i earlier in the test. A check was made of the pump's breaker control I v is 1 power fuse, which had been removed and reinserted as part of the test. I C le i After checking the fuse, which was apparently loose in its holder, the i Cl7 l pump started. The fuse was replaced and fuse clip tightness was checked. I

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surveillance tests and could effect operability of safety systems were i checked. The IC technicians will be informed of the problem and re- l i 2 [

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a g- g.j Q g .,. ,grjply Jersey Central Power & Light Company Madison Avenue at Punch Bowl Road Morristown, New Jersey 07960 (201)4554200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/79-37/3L-0 Report Date November 30, 1979 Occurrence Date November 3, 1979 Identification of Occurrence Violation of the Technical Specifications, paragraph 3.4.A.4, when core spray booster purep NZO3B did not restart during a surveillance test when required.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b(2).

Conditions Prior to Occurrence The plant was operating at steady state power. The major parameters at the time of occurrence were:

Power: Reactor, 1830 Mwt Generator, 634 Mwe Flow: Recirculation, 14.3 x 104 gpm Feedwater, 6.85 x 106 lb/hr Stack Gas: 3.19 x 104 pCi/sec Description of Occurrence Core spray booster pump N703B did not start when it should have dering a regular monthly surveillance test. The pump had properly started earlier in this same test. The technician checked the breaker control power fuse, which had been removed and reinserted as part of the test. After checking the fuse, wh*ch was apparently loose in its holder, the pump started. A job order was initiated to change the fuse and check the tightness of the fuse clips.

The fuse was replaced and the automatic actuation of the pump was reverified to confirm proper operability.

Apparent Cause of Occurrence 1511 30B Unable to determine whether personnel error or equipment defect wees the cause of the event.

Jersey Central Power & Light Company is a Member of the General Public L%t,es System

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.; portable Occurrence No. 50-219/79-37/3L-0 Page 2 November 30, 1979 Analysis of Occurrence The Core Spray System is an emergency system designed to provide continued cooling of the reactor fuel during loss of coolant accidents. There are two redandant loops, each capable of performing the design function. Each loop has two redundant sets of pumps, each capable of performing the design function. One set in each loop will automatically start in response to emergency signals. The other set in each loop is in reserve and will automatically start if the primary set does not. The safety significance of this event is minimal because the ability to deliver full design flow to the reactor was continuously provided by the core spray loop not being tested.

Corrective Action A Job order was initiated to check the rest of the fuses in the plant which are manipulated during surveillance tests and could affect operability of safety systems. No abnormalities were found. The instrument and control technicians will be informed of this problem and reminded to check the tightness of fuses when removing or reinstalling them.

Failure Data Not applicable.

1511 109

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