ML19318C052

LER 80-010/03L-1:on 790417,excavation Was Started to Repair Leak Near Inside Penetration within Pipe Tunnel.Activity Was Detected in Soil Near Dedt Line.Dedt Line Rerouted on 800316.Line Will Be Repaired

ML19318C052
Person / Time
Site:	Oyster Creek
Issue date:	06/20/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19318C049	List: ML19318C048 ML19318C052
References
LER-80-010-03L, LER-80-10-3L, NUDOCS 8006300477
Download: ML19318C052 (3)

Text

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74 75 REPORT O ATE 80 EVEN T DESCRIPTION AND PROBA8LE CONSEQUENCES h '

t O ::! l On March 15, 1979, a leak was noticed in the vicinity of the inside I 30,3, l penetration within the pipe tunnel. Analysis showed isotopic concentra- l

o ja; ; tion to be the same as that of the DEDT water. The DEDT line was re- l 10

3  ; routed. On Apr*l r 17, 1979, excavation commenced in order to effect I i c !e t e repairs. Activity was detected in the soll near the DEDT line. Based I

, l: i: ,  ; on analysis, the contamination was localized. (See the attached report I i e i s ; j for Reportable Occurrence 50-219/79-10/3L-1) I 8e SYSTEV CAUSE CAUSE COMP. VALVE 000; 000E SUSCOOE COM?O*;E*:T OOOE SU2000E SUSCOOE ici?)

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44 47 CAusE OESCRipitCN AND CCRRECTIVE ACTIONS l i l o l l The DEDT line was rerouted on March 16. 1979 to prevent further leakaae. I litii l Corrective action will consist of repairs to the line. The construction I li l21 I of a structure to enclose the pipe runs from the reactor buildino to the I y l main pipe tunnel has been completed. I 12 14 i i I 7 8 9 80

'sYA S *. POWER OTHER STATUS t CO Y OISCOVERY DESCRIPTION Analysis of Soil Sample Ii 15 l lE l@ l 0 l 9 l 5 l@l NA l l L l@l l ACTIVt TY CO TENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE li j s l l Ll @ l M l@l See Attachme;1t l l Drvwe11 Eautoment Drain Tank Li;te l 7 s 9 to it 44 45 80

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NAME 05 8RESARER Donald A. Ross PHONE: - NM-8784 8006300g*fl _

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" Jersey Central Power & Light Company

. b (I" ()j Madison Avenue at Punch Bowl Road Momstown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/79-10/3L-1 Report Date Update Report - June 20, 1980 Previous 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 occurrence 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 106 gpm -

Feedwater 6.837 x 10 4 lb/hr Stack Gas Activity: 3.66 x 10 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 sample", 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.

Jersey Central Power & Light Company is a Member of the General Pubhc Utihties System

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4 Rzportable Occurrence No. 50-219/79-10/3L-1 Paga 2 Update Report: June 20, 1980 Previous Report Date: May 17, 1979 Analysis of Occurrence LeW<s discovered in the Drywell Equipment Drain Tank discharge line (f .0. No.

50-219/79-10/3L) and Laundry Drain Tank discharge line (R.O. No. 50-211/79-26/3L) could not be completely analyzed at the time of occurrence. Core sample s taken prior to excavation and soil samples taken during excavation confirmed that the contamination was localized. A total of 17 drums of dirt removed from the hole had contamination levels above background and were shipped as radioactive waste.

Much of this was as a result of contamination spread in the dirt during shoveling and loading into drums. Based on the average concentration found in the drummed dirt, the following estimated activity was present:

Co 60 26 pCI Cs 134 3.6 pCi Cs 137 4.6 pCi 1

Af ter the hole was excavated to the desired depth of approximately 17 feet for construction of the vault, soil samples from the bottom were analyzed prior to pouring the concrete floor. None of the samples showed any detectable activity above normal background.

Well water samples from the Oyster Creek site and surrounding area are collected and analyzed every four weeks a: part of the plant Radiological Environmental Monitoring Program. There has been no observed detectable activity above normal background in samples collected.

1 It is concluded from the analytical results that: 1) Contamination from the leaks was indeed localized in the immediate area of the leaks; 2) No radioactivity entered into the water table; 3) All significant contamination in the soil was removed.

Corrective Action On March 15, 1979, a leak was notired 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 1 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 i March 16, 1979 I

Corrective action will consist of repairs to the line. The construction of a structure to enclose the pipe runs from the reactor building to the main pipe I tunnel has been completed.

Failure Data N/A i

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