ML19318B687

Revised LER 79-026/03L-1:on 790807,while Excavating to Make Repairs on Equipment Drain Tank Line,Leak Discovered in Laundry Tank Discharge Pipe.Apparently Caused by Component Failure.Line Repaired

ML19318B687
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
ML19318B686	List: ML19318B685 ML19318B687
References
LER-79-026-03L, LER-79-26-3L, NUDOCS 8006270303
Download: ML19318B687 (3)

Text

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"*"] l60 L J@l 0 l 510 61 l 0101211 1969 l@lEVENT GGCKET NUVSER 68 0 l810171719 QATE 74 75 l@l0161210 REPORT DATE 80 ! 810 l EVEN T DESCRIPTION AND PROBABLE CONSEQUENCES h Ic 1:1 l During normal operation, while excavatino to effect reoairs on the eauto- I ggI ment drain tank line (R0 50-219/79-10), a leak was discovered in the laund- I lo ia i ! ry tank discharge pipe. Flow rate of the leak was approximated to be 1/2 1 lo isi ; gpm while water was being pumped to radwaste. Samples were analyzed and i l

Ic se ! i revealed levels of Co60 and Mn54 Based on analysis. the contamination 1 1: 17, i was loca11 zed. (See the attached report for*Recortable Occurrence No. I l

ici4i gL_10-219/79-26/3L-1).

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36 37 40 44 47 CA' SE DESCRIPTICN AND CORRECTIVE ACTIONS h l1 lol l Isotoolc analysis cerformed on the snil and rentdual water revealed levels I l

L'_ L'.J l of Mn54 and cd>0 Immediate actl,nn wa< rn f<nlata tha ifna and e=n tha Ii12l l laundry tank oump "Out of Service". Corrective action consists of renates l Iiis t I to the line. The construction of a structure to enclose these nine runs I l i 14 l l from the Reactor Buildina to the main oloe tunnel has been comolered. I 7 4 3 80 STA 5 '6PCWER OTMER STATUS I O RY DIS:OVERY DESCRIPTION 11 151 (_,E_.jh l0 l 9 18 l@l NA l (,6_ j@l Durina reoai r work on another line. l-

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,ssvE 10 Weekly news release - September 12, 1979. I 68 69 I I I I I I I I I I I I ('

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NAVE w eaE nEn Donald A. Ross PHONE: 455-8784 l 8006270303 -. _ .

• Jersey Central P;wer & Light Company k ()

M.m,[.ft" Ma@ son Avenue at Punch Bowl Road G Mornstown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/79-26/3L-1 Report Date Update Report - June 20, 1980 Previous Report Date - September 6, 1979 Occurrence Date August 7, 1979 Identification of Occurrence Failure of the laundry drain tank discharge piping, resulting in the release of radioactive material. 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 operating at steady state power.

Power: Core, 1904.38 MWt Electric, 638 MWe 4

Flow: Recirculating, 15.0 x 10 gpm Feedwater, 7.188 x 106 lb/hr Stack Gas: 2.79 x 104 pci/sec Description of Occurrence On August 7, 1979, at approximately 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br />, a leak was discovered in the laundry tank discharge piping in the vicinity of the external penetration of the reactor building. A residual water sample taken was analyzed and revealed identifiable levels of Mn54 and Co60 A soil sample taken in the immediate vicinity was analyzed and revealed id..ntifiable levels of Coso, Apparent Cause of Occurrence Cor.ponent failure was the apparent cause of occurrence.

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

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e Reportable Occurrence No. 50-219/79-26/3L-1 Page 2 Update Report - June 20, 1980 Previous Report Date - September 6, 1979 Analysis of Occurrence Leaks discovered in the Drywell Equipment Drain Tank discharge line (R.O. No.

50-219/79-10/3L) and Laundry Drain Tank discharge line (R.O. No. 50-219/79-26/3L) could not be completely analyzed at the time of occurrence. Core samples 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 shovel-ing 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 uCI Cs 137 4.6 pCi 1

After 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 as part of the plant Radiological Environmental Moni toring Program. There has been no observed detectable activity above normal background in samples collected.

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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 Gamma isotopic analysis was performed on a soil and resitual water sample collected in the immediate vicinity. The water sample revealed identifiable icvels of Mn 54 and Coso, The immediate action taken after identifying the source of the leak was the tagging "Out of Service" of the laundry tank pump and isolation of the laundry tank dis-

! charge piping. This action took place within two hours after discovery of the i

leak. A tempo.rary rerouting of the laundry tank water has been made until per-manent corrective action is completed.

Corrective action consists of repairs to the line as well as an inspection of all other piping in the immediate vicinity has been completed. The construction of I a structure to enclose these pipe runs from the reactor building to the main pipe tunnel has been completed.

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Failure Data Not applicable l

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