ML19337A834

Nonroutine Environ Operating Rept 80-7:on 800901,02 & 04, Four Individual Dilution Pump Trips Occurred During Which Inoperative or Reserve Pump Could Not Be Started within Required 15 Minutes.Caused by Component Failure

ML19337A834
Person / Time
Site:	Oyster Creek
Issue date:	09/19/1980
From:	Finfrock I JERSEY CENTRAL POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-50-219-80-7, NUDOCS 8009300404
Download: ML19337A834 (2)

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OYSTER CREEK NUCLEAR GENERATING STATION JCP&L GPU m,c.=jpgaj L""h u..s ?O (6o9) 693-1951 P.O. BOX 388

• FORKED RIVER

• NEW JERSEY

• 08731 September 19, 1980 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I United States Nuclear Regulatory Comission 631 Park Avenue King of Prussia, Pennsylvania 19406

SUBJECT:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Nonroutine Environmental Operating Report No. 50-219/80-7 This letter forwards two copies of Nonroutine Environmental Operating Report No. 50-219/80-7 in compliance with paragraph 5.6.2 of Appendix B to the Technical Specifications.

Very truly yours,

&

Ivan R. Finfro , Jr Vice President-Gen ation Enclosures cc: Director (17 copies)

Office of Nuclear Reactor Regulations United States Nuclear Regulatory Commission Washington, D. C. 20555 c/o Distribution Services Branch, 00C, ADM

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OYSTER CREEK NUCLEAR GENERATING STATION M _.

M* *,a/fh.,.8Z uu s- (609) 693-1961 P.O. BOX 388

• FORKED RIVER

• NEW JERSEY

• 08731 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Nonroutine Environmental Operating Report No. 50-219/80-7 Report Date

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September 19, 1980 Occurrence Date September 1, 2 & 4, 1980 Identification of Occurrence Exceeding a limiting condition as defined in the Environmental Technical Specifica-tion, Paragraph 2.1.4.3, when within a span of four days, four individual dilution pump trips occurred in which the inoperative or the reserve pump could not be started within the required 15 minutes. During each occurrence, the U.S. Route #9 discharge bridge temperature exceeded 87*F. These events were imediately identified at the time of nc.1-compliance.

This event is considered to be a ronroutine environmental operating report as defined in the Technical Specifications, Appendix "B", paragraph 5.6.2.

Conditions Prior to Occurrence Steady State Power Dilution Pump Flow: 5.20 E5 GPM Circulating Water Pump Flow 4.60 E5 GPM Description of Occurrence Prior to the events of September 1, 2, and 4,1980, vibration in the motor of dilution pump 1-2 had been recognized and documented by both the plant staff and representatives of the General Electric Company. Oilution pump 1-2 was tagged out of service with explicit instructions given that it be operated only in emergency situations. At 1704 hours0.0197 days <br />0.473 hours <br />0.00282 weeks <br />6.48372e-4 months <br /> on September 1,1980, dilution pump 1-3 tripped following an overload alarm. Further investigation indicated that the pump impeller had locked causing the motor to stall. Dilution pump 1-1 subsequently tripped at 1811 hours0.021 days <br />0.503 hours <br />0.00299 weeks <br />6.890855e-4 months <br /> due to insufficient cooling flow setpoint. This pump was restarted six (6) minutes following the trip.

Recognizing that an insufficient number of dilution pumps were in operation and that dilution pump 1-3 could not be restarted, instructions were given to start dilution pump 1-2. Pump 1-2 was started at 1911 hours0.0221 days <br />0.531 hours <br />0.00316 weeks <br />7.271355e-4 months <br />. During this occurrence, the total period of time that an insufficient number of dilution pumps were in operation was 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 7 minutes. The time of non-compliance discharge was 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 52 minutes.

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. Nonroutine Environmental Operating Report No. 50-219/80-7 Page 2 The following day, September 2,1980, two instances occuri ed, both caused by excessive ,

vibration in the motor of dilution pump 1-2. A mercoid temperature sensor switch which protects the lube oil cooler was vibrated to its trip point. This in turn caused the pump to trip out on a false high temperature alarm. Once the mercoid switch was reset, the pump could be restarted. Dilution pump 1-2 tripped at 1028 and was restarted at 1050. This pump was out of service for 22 minutes, 7 of which were in a non-complying state. Dilution pump 1-2 again tripped at 1109 and was restarted

, at 1141. Total down ttme was 32 minutes. This non-compliance lasted 17 minutes.

1 At 0631 on September 4,1980, corrective maintenance was commenced on dilution pump 1-2. Pump 1-2 was taken out of service to uncouple and remove its defective motor.

The motor from seized dilution pump 1-3 was installed, spin tested.. and coupled to pump 1-2. Dilution pump 1-2 was then started at 1808 on September 5,1980. The total time this pump was out of service was 35 hours4.050926e-4 days <br />0.00972 hours <br />5.787037e-5 weeks <br />1.33175e-5 months <br /> and 37 minutes and the integrated time of non-compliance was 35 hours4.050926e-4 days <br />0.00972 hours <br />5.787037e-5 weeks <br />1.33175e-5 months <br /> and 22 minutes.

Apparent Cause of Occurrence )

i Component Failure Analysis of Occurrence, The operation of two dilution pumps is required when the U.S. Route #9 discharge bridge temperature exceeds 87.0*F. Operation of the dilution pumps in the prescribed manner will minimize adverse effects on most species of fish. In esch of the four pump trips, no harmful marine biological effects were expected or observed.

Corrective Action The defective motor coupled to dilution pump 12 was removed from its pedestal and replaced with the motor removed from dilution pump 1-3, which seized. This rendered dilution pump 1-2 fully operable and trouble free.

Dilution pump 1-3 seized because the pump impeller sheared a number of its connecting bolts and jammed against it housing. Dilution pump 1-3 will be repaired and returned to service.

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