ML19289E850

LER 79-010/03L-0 on 790417:leak of Isotopic Concentration Noticed Near Inside Penetration within Pipe Tunnel.Caused by Component Failure.Drywell Equipment Drain Tank Line Rerouted to Prevent Further Leakage

ML19289E850
Person / Time
Site:	Oyster Creek
Issue date:	05/17/1979
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19289E843	List: ML19289E842 ML19289E850
References
LER-79-010-03L, LER-79-10-3L, NUDOCS 7905290175
Download: ML19289E850 (3)

Text

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'o 1 ,"7,'$ l L l@ 0 l 5 010 lo 12 l 1 19 l@l690 l4 1 171719I@ 74 75 01511!71719 REPORT DATE 80 8 60 61 DOCKET NUMBER 68 EVENT DATE EVENT DESCnlPTION AND PROBABLE CONSEQUENCES h o 2 l On March 15. 1979. a leak was noticed in the vicinity of the inside I o a l penetration within the pipe tunnel. Analysis showed isotopic concentra- I o 4 l tion to be the same as that of the DEDT water. The DEDT line was re- 1 O s routed. On April 17, 1979, excavation commenced in order to affect o s I repairs. Activity was detected in the soll near the DEDT line. Based 1 0 7 I on analysis, the contamination appears to be localized. The extent I o 8 I of contamination will be known after excavation is completed & analyzed. I 80 7 8 9 S YST E *. CAUSE CAUSE COMP VALVE CODE COOE SU8 CODE COVPONENT CODE SUBCODE SUDCODE 7

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q Jersey Central Power & Light Company

.< , , (4" h a Madison Avenue at Punch Bow! Road Mornstown, New Jersey 07960 (201)455 4200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 L!censee Event Report Reportable Occurrence No. 50-219/79-10/3L-0 Report Date May 17, 1979 Occurrence Date April 17, 1979 Identification of Occurrence Unmonitored release of radioactive water from the drywell equipment drain tank discharge piping. This event is considered to be a reportable occurrenc'e as defined in the Technical Specifications, paragraph 6.9.2.b.4.

Conditions Prior to Occurrence The plant parameters at the time of the occurrence were:

Power: Reactor, 1834.18 MWt Electrical, 644 MWe Flow: Recirculation, 14.1 x 10 gpm 6 Feedwater, 6.837 x 10 lb/hr 4 Stack Gas Activity: 3.66 x 104 pCi/sec.

Description of Occurrence On April 17, 1979, at approximately 1045 hours0.0121 days <br />0.29 hours <br />0.00173 weeks <br />3.976225e-4 months <br />, soil samples were taken from the immediate area of the drywell equipment drain tank line between the reactor building and the pipe tunnel. The isotopic distribution was consistent with that of primary coolant that had decayed for a month.

Apparent Cause of Occurrence The cause of this occurrence is attributed to component failure.

Analysis of Occurrence A complete analysis of this occurrence cannot be made at this time. On April 4,1979, core samples were taken outside the reactor building approxi-mately l'-8" from the DEDT line, and l'-7" from the pipe tunnel. Undisturbed 204/ ?28 Je se . Centra! Power & Light Company is a f.iember of the Genera! Pubhc Ut:ht es System

t Reportable Occurrence No. 50-219/79-10/3L-0 Page 2 May 17, 1979 soll samples were taken at the following depths of 5,10,15 and 20 feet below ground level. The analysis of the samples revealed no significant activity above normal background. On April 17, 1979, excavation commenced in order to effect repairs. It was at this time that activity was detected in the soll in the immediate area of the Drywell Equipment Drain Tank (DEDT) line. Based on these analyses, it appears evident that the contamination was localized. The extent of contamination will be known af ter excavation is completed and further samples are analyzed.

A supplement to this reportable occurrence vill be forwarded at the com-pletion of necessary excavation activities ar.d analysis.

Corrective Action On March 15, 1979, a leak was noticed in the vicinity of the inside penetration within the pipe tunnel. A sample of the water in the pipe tunnel was analyzed and the gross beta concentration was 3.1 x 10- pCi/ml. The gamma isotopic analysis showed the isotopic composition to be the same as that of the drywell equipment drain tank water.

The immediate action taken was the preparation for rerouting of the DEDT line to prevent further leakage. Rerouting of the line was accomplished on March 16,1979 Corrective action will consist of repairs to the lir.e, as well as the construction of a structure to enclose the pipe runs from the reactor build-ing to the main pipe tunnel.

Failure Data N/A 2047 229