ML20040C607
| ML20040C607 | |
| 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 8201290076 | |
| Download: ML20040C607 (2) | |
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' OYSTER CREEK NUCLEAR GENERATING STATION :
Forked River, New Jersey 08731 Nonroutine Environmental Operating Report No. 50-219 81-3-2 Report Date Deceber 22, 1981-Occurrence Ihte November 28, 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 ambient water temperature was less than 600F.
Conditions Prior to Occurrence Steady State Power Dilution Pump Flow 5.20 ES G1H Circulating Water Pump Flow 4.60 E5 GPM Prior to the occurrence, the ambient water temperature in the intake cant' was 43.10F.
The condenser discharge water temperature was 63.1 F, and the U.S.
Route 9 Discharge bridge temperature was 50.60F.
Description of Occurrence At 2155 hours0.0249 days <br />0.599 hours <br />0.00356 weeks <br />8.199775e-4 months <br /> on November 28, dilution pump 1-1 tripped off, leaving only
- dilution pump 1-3 in operation.
At 2211 hours0.0256 days <br />0.614 hours <br />0.00366 weeks <br />8.412855e-4 months <br />, dilution pump 1-2 was put into service.
Apparent Cause of Occurrence The cause of the' trip was attributed to the pump impeller coming loose, and dropping of f of. Its housing.
It then wedged against the pump structure housing causing the pump to fail.
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o Nonroutine Bavironmental Operating Report Page 2 Report No. 50-219 81-3-2 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 insufficient number of dilution pumps was of limited duration, there were no harmful marine biological effects observed.
Corrective Action Dnmediate corrective action involved putting dilution pump 1-2 in operation.
Long term action, as per a submittal to the Nuclear Regulatory Commission on July 1,1981, involves a total dilution pump improvement program designed to improve their reliability and operability, is in progress.
This includes 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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