ML20040C620
| ML20040C620 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 12/22/1981 |
| From: | JERSEY CENTRAL POWER & LIGHT CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20040C598 | List: |
| References | |
| NUDOCS 8201290090 | |
| Download: ML20040C620 (2) | |
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0YSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Nonroutine Environmental 0 prating Report No. 50-219 81-5-2 Report Ihte December 22, 1981 Occurrence Date Eecember 2,1981 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 the ambient i
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 Steady State Power Dilution Pump Flow 4.88 E5 GPM Circulating Water Pump Flow 4.60 E5 GPM Dilution pump 1-1 out of service for maintenance Prior to the occurrence, the ambient water temperature in the intake canal was 47.60F.
The condenser discharge water temperature was 67.30F, and the U.S.
Route 9 Discharge Bridge temperature was 55.3 F.
De scription of Occurrence At 0729 hours0.00844 days <br />0.203 hours <br />0.00121 weeks <br />2.773845e-4 months <br /> on December 2, dilution pump 1-2 tripped of f, leaving only dilution pump 1-3 in operation.
At 0758 hours0.00877 days <br />0.211 hours <br />0.00125 weeks <br />2.88419e-4 months <br />, dilution pump 1-2 was restarted and returned to service.
At 0907 hours0.0105 days <br />0.252 hours <br />0.0015 weeks <br />3.451135e-4 months <br /> on December 2, dilution pume 1-2 tripped of f, leaving only dilution pump 1-3 in operation.
At 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br />, dilution pump 1-2 was returned to service.
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Nonroutine Environmental Operating Report Page 2 Report No. 50-219 81-5-2 Apparent Cause of Occurrence In both instances, high oil temperatures caused the pump to fail.
The second trip was directly attributed to a clogged twin strainer screen on the cooling s ys tem.
This caused the excessive oil temperatures.
Since the first pump f ailure was due to high oil temperature, it would appear that a clogged strainer screen may have been an attributing factor in the first event.
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.
Since the operation of an insuf ficient number of dilution pumps was of limited duration, there were no harmful marine biological effects observed.
Corrective Action Immediate corrective action involved effecting the appropriate repairs as a result of the clogged twin strainer screen and returning pump 1-2 to service.
Long term action, as per a submittal to the Nuclear Regulatory Commission on July 1,1981, a total dilution pump improvement program designed to upgrade their reliability and operability, is in progress.. This includes improvement of the dilution pump seal water and lubricating oil cooling water systems, pipe line strainers, pipe and heat tracing and overhaul of the dilution pumps.
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