ML20064E727

RO 82-7:on 821201,dilution Pump 1-3 Removed from Svc.Caused by Mud & Debris Clogging Grates,Blocking Water Flow to Dilution Pump.Mud & Debris Removed.Total Dilution Pump Refurbishment Program Planned

ML20064E727
Person / Time
Site:	Oyster Creek
Issue date:	12/21/1982
From:	GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20064E696	List: ML20064E692 ML20064E706 ML20064E715 ML20064E722 ML20064E727
References
RO-82-7, NUDOCS 8301060111
Download: ML20064E727 (2)

Text

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J- e O i OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Nonroutine Environmental Operating Report No. 50-219/82-7 Report Date Occurrence Date December 1, 1982 Identification of Occurrence Exceeding a limiting condition as defined in the Environmental Technical Specifications, paragraph 2.1.4.3, when an insufficient number of dilution pumps were in operation as specified in paragraph 2.1.4.2. Less than two dilution pumps were operating for greater than 15 minutes, and ambient water temperature was less than 600F.

This event is considered to be a Nonroutine Environmental Operating Report as defined in the Technical Specifications, Appendix "B", paragraph 5.6.2.

Conditions Prior to Occurrence Dilution Pump Flow - 5.20 E5 GPM .,s T' ,) i Circulating Water Pump Flow - 4.60 E5 GPM -

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l Dilution pump 1-1 out of service for repairs. ,

I Frior to the occurrence, the ambient water temperature in the intake canal wcs O . '

46.30F. The condenser discharge water temperature was 56.80F, and the U.S. '

Route 9 discharge bridge temperature was 49.0 F. 0 y

Description of Occurrence d

At 0722 hours0.00836 days <br />0.201 hours <br />0.00119 weeks <br />2.74721e-4 months <br /> on December 1,1982, dilution pump 1-3 was removed from service

! because of mud-clogged grates, leaving only dilution pump 1-2 in operation. At ,

i 1036 hours0.012 days <br />0.288 hours <br />0.00171 weeks <br />3.94198e-4 months <br /> on December 1,1982, dilution pump 1-3 was returned to service. m

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Apparent Cause of Occurrence .)

l Dilution pump 1-3 was removed from service as a result of mud and' debris

. blocking the water flow to the dilution pump, resulting in a pressure gradient -

across the gra tes. )

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Nonroutine Environmental Operating Report Page 2 Report No. 50-219/82-7 Analysis of Occurrence The continuous operation of the dilution pumps is required to maintain water temperatures within the specified limiting conditions. The objective of operating the dilution pumps in the prescribed manner is to minimize the occurrence of adverse biological effects in Oyster Creek and contiguous water.

There were no harmful marine biological effects observed during the period when an insufficient number of dilution pumps operated.

Corrective Action Immediate corrective action involved restoring proper flow through the grates by removing the mud and debris, then restarting pump 1-3.

Additionally, long term action, per a submittal to the Nuclear Regulatory Coenission on July 1,1981, involves a total dilution pump refurbishment program designed to improve the reliability and operability.of the pumps. This includee upgrading of the dilution pump seal water and lubricating oil cooling water systems, pipe line strainers, pipe and heat tracing and overhaul of dilution pumps.

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