ML20040C631
| ML20040C631 | |
| 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 8201290102 | |
| Download: ML20040C631 (2) | |
Text
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OYSTF.R CREEK NUCLEAR GENERATING STATION t,
Forked River, New Jersey 08731 Nonroutine Environmental Operatin1 Report 50-219 81-7-1 II,
Report Date
/
Deomber 22, 1981 l/
Occurrenca Date i
December 7,1981 Identification of Occurrence Exceeding a limiting condition as defined in the Environmental Technical Specifications, paragraph 2.1.1, when the temperature difference between circulating water intake and the discharge exceeded the maximum of 230F for a period of one hour.
This event is considered to be a Nonroutine Environmental Operating Report as defined in the Tbchnical Specifications, Appendix "B", Paragraph 5.6.2.
Conditions Prior to Occurrence Steady State Power Dilution Pump Flow 7.80 ES GPM Circulating Water Pump Flow 4.60 E5 GPM Dilution pump 1-1 is out of service for maintenanca.
Prior to the occurrence, the ambient water temperature in the intake canal was 3 6.10 F.
The condenser discharge water temperature was 56.50F, and the U.S.
Route 9 Discharge Bridge temperature was 43.70F.
Description of Occurrence As 'a result of the exceasive grass clogging the intakes, the volume of water drawn in was reduced.
This also decreased the amount of water discharged, but the amount of heat remained the same as in normal flow conditions.
During l
backwashing of the condenser tubes, the power level was not reduced; as a result the 230F temperature difference was exceeded.
At 1245 houre, the intake temperature was 37.30F and the discharge temperature was determined to be 61.90F.
The temperature dif ference was 24.60F, thus exceeding the permit limit of 230F with four circulating pumps in operation.
8201290102 811222 l
Apparent Cause of Occurrence hDRADOCK05000 The cause of the temperature excursion was due to excessive grass clogging the intake, reducing the flow of both the intake and discharge.
The amount of heat being discharged was the same as'in normal operation, but due to the reduced discharged water flow, the temperature difference was exceeded.
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marout:ine Environmental Operating. Report Page 2 Report No. 50-219 81-7-1 Analysis of Occurrence The purpose.of the requirement to maintain the prescribed temperature differetce between the intake and discharge is to minimize the occurrence of adverse biological ef fects in Oyster Creek and contiguous water.
Since the temperature excursion was of limited duratien, there were no harmful aquatic biological ef fects observed.
Corrective Action Operations took steps to correct the situation by initiating load reduction until the station was in compliance with the limiting condition.
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