ML20030D181
| ML20030D181 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 08/21/1981 |
| From: | Carroll J JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RO-50-219-81-2, NUDOCS 8108310484 | |
| Download: ML20030D181 (3) | |
Text
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u OYSTER CREEK L
NUCLEAR GENERATING STATION
$251E" NZ ;'!'"..',
(609) 693-1951 P.O. BOX 388 e FORKED RIVER e NEW JERMY e 08731
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August 21, 1981 Mr. Boyce H. Grier, Director Office of Inspection and Enforcenent Region I United States Nuclear Regulatory Ccanission 631 Park Avenue King of Prussia, PA 19406
Dear 't Grier:
Sobject: Oyster Creek Nuclear Generating Station Docket No. 50-219 Nonroutine Envimmental Operating Report No. 50-219/81-2-1
'Ihis letter forwards two copies of Nonroutine Environmental Operating Peport No. 50-219/81-2, revision 1 in empliance with paragraph 5.6.2 of Appendix B to the Technical Specifications.
Very truly yours, 2 0.44 / '
I J
T. Carroll, Jr.
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.cting Director 4 r Creek, l
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Office of Nuclear Reactor Regulations N
United States Nuclear Regulatory Ccmnission g
g Washington, D.C.
20555 NRC Resident Inspector (1)
T Oyster Creek Nuclear Generating Station Forked River, NJ 08731 3lll l
8108310484 810821' PDR ADOCK 05000219 S
OYSTER CREEK NUCLFAR GENEIVEING ST) TION Forkal River, New Jersey 08731 Nonroutine Environmental Operating 3eport No. 50-219/81-2 -1 Report Date August 21, 1981 Occurrence Inte July 29, 1981 Identification of Occurrence ExWng a limiting condition as defined in the Envimmen.al Technical Speci-fications, raragraph 2.1.4.1, when an insufficient nurrber of dilution ptrqps were in operation. Iess than two dilution ptznps were operating for a period of 16 minutes, and the water tsperature at tln U.S. Route 9 bridge exceeded 87Y during this period.
'Ihis event is considered to be a Nonroutine Environmental Operating Peport as defined in the Technical Specification, Appendix "B", Paragraph 5.6.2.
Conditions Prior to Occurrence Steady State Power 362 megawatts 5
Dilution Pump Flow 5.20 x 10 g Circulating Water 5
Punp Flow 4.60 x 10 g Dilution punp 1-1 out of service.
Gior to the occurrence, the ambient water taperature in the intake canal was 0
l 80.8 F.
The condenser discharge water taperature was 96.5 F and the U.S. Route 0
9 rischarge Bridge taperattire was 87.7 F.
Escription of Occurrence At 1512 hours0.0175 days <br />0.42 hours <br />0.0025 weeks <br />5.75316e-4 months <br />, dilution ptmp 1-3 tripped out of sewice leaving only dilution punp 1-2 in operation. At the tine of the trip, the taperature at the Route 9 l
bridge had been 87 F since 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br />, requiring one dilution pump to be in l
operation (a requirenent that was met with dilution purp 1-2 in service) and a second to be put in operation by 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> should the taperature continue to o
0 exceed 87 F.
The tsperature did continue to exceed 87 F, however, dilution punp 1-3 could not be placed in service until 1538 hours0.0178 days <br />0.427 hours <br />0.00254 weeks <br />5.85209e-4 months <br />. Upon returning punp l
l-3 to service, dilution punp 1-2 tripped off fran 1539 to 1546 hours0.0179 days <br />0.429 hours <br />0.00256 weeks <br />5.88253e-4 months <br />.
l Consequently, two dilution ptmps were not in operation after the taperature at the Poute 9 bridge exceeded 870F for more tien two hours. Both punps were in l
operation at 1546 huurs.
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Nonroutine Environmental Operating Peport Page 2 Petort No. 50-219/81-2 -1 gr.c Cause of occurrence me cause of the trips could not be determined at the time of the occurrence.
However, previous history indicates that incidents of this nature have been attributed to high lubricating oil tsuperatures and low seal water pressure. It is possible that one of these factors or a ombination of these factors could have caused the dilution p mps to fail in this instance.
Analysis of Occurrence The ccntinuous operation of up to two dilution pmps is required to maintain water tarperatures below 87 F at the U.S. Poute 9 bridge at Oyster Creek. The 0
objective of operating the dilution pmps in the prescribed Inanner is to minimize the occurrence of adverse biological effects in Oyster Creek and contiguous water. Since the operaticn of an insufficient nunber of dilution pups was of limited duration, them wre no harmful trarine biological effects observed.
Corrective Action Tm:w h te corrective acticn involved restarting dilution p m p3 1-2 and 1-3.
Pmp 1-1 which has been out of service for notor repairs and thereby unavailable as a standby pm p, is presently undergoing startup testing and is expacted to be available for service shortly.
Long term action, as per a subnittal to the Nuclear Regulatory Ccmnission on July 1,1981, a total dilution pep improvenent program designed to ameliorate their reliability and operability, is in progress. m is includes upgrading of the dilution pmp seal water and lubricating oil cooling water systens, pipe line strainers, pipe and heat tracing and overhaul of the actual dilution pmps.
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