05000219/LER-1982-034, Forwards LER 82-034/03L-0.Detailed Event Analysis Encl

Forwards LER 82-034/03L-0.Detailed Event Analysis Encl

ML20062B989
Person / Time
Site:	Oyster Creek
Issue date:	07/16/1982
From:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20062B995	List: 05000219/LER-1982-034, Forwards LER 82-034/03L-0.Detailed Event Analysis Encl
References
NUDOCS 8208050126
Download: ML20062B989 (3)

LER-2082-034, Forwards LER 82-034/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2192082034R00 - NRC Website

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GPU Nuclear gg g7 P.O. Box 388 Forked River, New Jersey 08731 609-693-6000 Writer's Direct Dial Number:

July 16, 1982 Mr. Ronald C. Haynes, Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Mr. Haynes:

Subj ect: Oyster Creek Nuclear Generating Station Docket No. 50-219 Licensee Event Report Reportable Occurrence No. 50-219/82-34/03L This letter forwards three copies of a Licensee Event Report to report Reportable Occurrence No. 50-219/82-34/03L in compliance with paragraph 6 9 2.b.4 of the Technical Specifications.

Very truly yours, k/VfS ol Peter B. Fiedler Vice President and Director Oyster Creek PBF:lse Enclosures cc: Director (40 copies)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Director (3)

Office of Management Information and Program Control U.S. Nuclear Regulatory Commission Washington, D.C. 20555 NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, NJ 08731 DC ohhDf9 PDR v

GPU Nuclear is a part of the General Pubhc Utihties System gb i

. ~.

OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/82-34/03L Report Date July 16, 1982 Occurrence Date June 16, 1982 Identification of Occurrence An unmonitored release of radioactive water to the environs occurred due to a pressure gage connection failure at the 1-2 condensate tranfer pump inside the Condensate Transfer Pump Building.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6 9 2.b.4.

Conditions Prior to Occurrence The plant was in the RUN mode and was increasing power at a rate of 1 to 2 percent an hour.

1506 MWt 506 MWe Description of Occurrence At approximately 0605 hours0.007 days <br />0.168 hours <br />0.001 weeks <br />2.302025e-4 months <br /> on 6/16/82, an equipment operator discovered that the 1/2" pipe on the 1-2 condensate transfer pump, which holds the pressure gage, sheared off at the threaded joint just before the 1/2" isolation valve.

This sprayed contaminated water against the inside of the south wall of the Condensate Transfer Building which then leaked to the ground outside the buildi ng .

Apparent Cause of Occurrence The apparent cause of the failure was fatigue of the pipe due to pump vib ration. The cause of the pump vibration is an imbalance in the rotating assembly.

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Licensee Event Report Page 2 Reportablo Occurrence No. 50-219/82-34/03L Analysis of Occurrence An equipment operator toured the Condensate Transfer Building at 0450; therefore, the maximum time period of leakage was 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />,15 minutes. This calculates to a maximum of 9,700 gallons discharged inside the building. The bulk of the water discharged was contained inside the building (by the asphalt floor and sump that was installed last year and/or went to radwaste via drain and sumps. A maximum calculated amount of 300 gallons of contaminated water could have leaked out of the building affecting approximately 165 sq. ft. of soil.

Several soil samples were taken over a period of two days to determine the effect of the leakage and what future actions would be necessary. Samples taken of the surface soil just south of the building at 0630 on 6/16/82 (1/2 hour af ter the spill) ranged from 4.84 E-6 microcuries/gm to 145 E-5 microcuries/gm total activity. Samples taken in the same area at 1330 on 6/17/82 from a depth of 6' to 12" ranged from 5 70 E-6 to 1.36 E-5 microcuries/gm total activity with half of the samples taken not having any detectable activity. Other samples taken at 1145 on 6/16/82 from the base of the hill on which the Condensate Transfer Building sits, showed no detectable activity present. Based on the 300 gallon figure, a total beta and gamma activity of 108 microcuries was released.

Corrective Action Immediately upon discovering the problem, the operator shut off and isolated the affected condensate transfer pump. The affected area outside the building was posted as a contaminated area.

Future corrective actions:

1) With regard to the excessive vibration, a previously completed engineering evaluation initiated as a result of similar pipe failures in this area, has determined that the rotating assemblies of both the condensate transfer and demineralized water pumps are not properly balanc ed. The rotating assemblies of these pumps will be replaced with new balanced assemblies. .

2) In order to prevent future leakage to the environs, additional sealing between the walls and floor of the building will be effected.

3) A level alarm for the sump in the Condensate Transfer Building will be installed during the upcoming refueling outage.