ML20090D656

AO-50-219/75-14:on 750529,during Surveillance Test of Containment Spray Pump Operability,Essential Svc Water Pump 1-2 Failed to Develop Sufficient Discharge Pressure.Caused by Dirt in Check Valve V-3-68.Valve Cleaned & Repaired

ML20090D656
Person / Time
Site:	Oyster Creek
Issue date:	06/06/1975
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	Giambusso A Office of Nuclear Reactor Regulation
References
AO-50-219-75-14, NUDOCS 8303020240
Download: ML20090D656 (3)

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. O O Jersey Central Power & Light Company MADISON AVENUE AT PUNCH BOWL ROAD e MORRISTOWN. N.J. 07960

• 201-533-6111 a ..a , a ,,,,

Generat Public Utilities Corporation June 6, 1975 g A

Q ,1 Mr. A. Giambusso Director, Division of Reactor Licensing

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Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission 4 Washington, D. C. 20555 ,

Dear Mr. Giambusso:

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Subject:

Oyster Creek Station Docket No. 50-219 Abnormal Occurrence Report No. 50-219/75-14 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.

Very truly yours, O / ,

Donald A. Ross,' Manager Generating Stations-Nuclear ,

cs Enclosures cc: Mr. J. P. O'Reilly, Director Office of Inspection and Enforcement, Region 1 8303020240 750606 PDR ADOCK 05000219 S PDR @gm '[.[

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l Jersey Central Power & Light Company %(,d MADISON AVENUE AT PUNCH BOWL ROAD

• MORRISTOWN, N.J. 07960

• 201-539-6111

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OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Abnormal Occurrence Report No. 50-219/75-14 Report Date June 6, 1975 Occurrence Date May 29, 1975 Identification of Occurrence Failure of one of the Emergency Service Water (ESW) Pumps to develop adequate discharge pressure during the monthly surveillance testing of containment spray This event is considered to be an abnormal occurrence as pump definedoperability.)hnical in the Tec Specifi::ations, paragraph 1.15.D.

i Conditions Prior to Occurrence The plant was undergoing load changes during routine power operation with major plant parameters as follows:

Power: Core, 1212 MWt Electric, 390 MWe 4

Flow: Recirculation, 9.8 x 10 gpm Feedwater, 4.5 x 10 6 lb/hr Stack Gas: 4,390 pei/sec Description of Occurrence On Thursday, May 29, 1975, at approximately 1030, while performing routine containment spray pump automatic actuation and operability surveillance testing, ESN Pump 1-2 failed to develop sufficient discharge pressure. The procedure calls for testing the automatic actuation of Containment Spray Pump 51-A and ESW Pump 1-1 first with subsequent manual initiation of Containment Spray Pump 51-B L

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. Abnormal Occurrence Report No. S0-219/75-14

, Page 2 and ESW Pump 1-2. The pump discharge pressure from ESW Pump 1-1 was 107 psig with an emergency service water pressure of 63 psig at the discharge of the containment spray heat exchangers. ESW Pump 1-2 operated at a reduced discharge pressure with an emergency service water pressure of 20 psig at the discharge from the heat exchangers. While ESW Pump 1-2 was operating, ESW Pump 1-1 was observed to be turning in the opposite direction to its regular rotation.

Apparent Cause of Occurrence Failura of ESW Pump 1-2 to develop sufficient discharge pressure was attributed to dirt in check valve V-3-68 (at the discharge of ESW Pump 1-1) which prevented proper seating of the valve. The flow through the improperly seated check valve caused the reverse rotation of ESW 1-1 and the reduced pressure.

Analysis of Occurrence Since the containment spray system is a redundant system within itself and full capacity cooling is availabic through the other system, the only safety significance of this event is the loss of ESW Pump redundancy in one containment spray loop.

Corrective Action The corrective action was to disassemble, inspect, clean, and repair V-3-68. The discharge check valves for the other ESW "ymps will be inspected in an effort to prevent a similar occurrence.

Failure Data Basic valve data are as follows:

Manufacturer: Mission Valve and Pump Company Type: Spring Loaded Duo - Check Size: 10 inch Rating: 2SO#

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