ML19296D447

LER 80-004/03L-0:on 800125,on 800125,29 & 0213,radioactive Water Discovered Leaking from Severely Pitted Aluminum Piping of Condensate Transfer Sys.Caused by Galvanic Corrosion.Leaks Temporarily Repaired & Piping to Be Replaced

ML19296D447
Person / Time
Site:	Oyster Creek
Issue date:	02/25/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19296D440	List: ML19296D439 ML19296D447
References
LER-80-004-03L, LER-80-4-3L, NUDOCS 8003040599
Download: ML19296D447 (3)

Text

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SO 61 COCK ET NLvBER 6d 69 EVENT DATE 74 75 AEPORT C ATE 80 EVENT OESCRIPTION Ar.O PROB ACLE CONSECUENCES h 012 l On Januarv 25. on Januarv 20 and acain en February 11 1080. radim ct- I lo#3i l ive water was discovered leakina from severelv citted aluminum pipina of I o la i I the condensate t rans fer system. The oicine was beina uncovered for in- l 1015] I spection. Water and soil samples were collected and analyzed. All pot- 'l io'6 I entiallv contaminated soil was collected and placed in 55 qallon drums i l c 171 l lined with plastic bacs. Th e event is considered an unmonitored release l

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u 3 40 4' 43 CAUSE CESC Ai8TICN AND CORRECTIVE ACTIONS o i The cause of this occurrence is attributed to excessive oitting caused I i li i bv calvanic corrosion. The leaks were temocrarilv recaired. Test bor- l i ,7 l ings to a depth of 30 feet were obtained to evaluate the extent of soil 3 ,3 l contamination. All aluminum pipino will be reolaced this outaae. A l i & I sacrificial anode with remote means of readino cround amos will be added. J 7 8 9 80 F ACILt*Y METH 00 07 STATUS  %#0wEA OTHEPSTATUS ~

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4" h 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 Recortable Occurrence No. 50-219/80-4/3L s

Report Date Fe b rua ry 25, 1980 Occurrence Date January 25, 1980 identification of Occurrence Unmonitored release of radioactive water from leaking underground aluminum con-densate 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 was shutdown for a refueling / maintenance outage.

The reactor was subcritical.

The resctor mode switch was locked in refuel.

The reactor cavity was flooded and less than 212*F.

Descriotion of Occurrence On Friday, January 25, 1980, late in the workir g day, contractors, assigned to uncover the underground aluminum pipes from the condensate storage tank for an inspection, discovered water in the area of excavation. To determine the source of water, further excavation was required. Upon investigation, it was discovered that there were several pinhole leaks caused by severe pitting. The leaks were

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identified and temporarily repaired on Sunday, January 27, 1980.

On Saturday, water and soil samples had been collected. An isotopic analysis was run on each sample and the maximum concentration of any isotope detected in any sample was 3.97E-03 uCi/cc of Coso, On Tuesday, January 29, 1980, an additional leak was discovered on the same line which was repaired in a few hours.

Jersey Centra Power & Ugn: Comeany is a Memter of the General Pubhc Utsties System

Reportab1: Cccurrence No. 50-219/80-4/3L Page 2 February 25, 1980 Potentially contaminated dirt, mud, etc. was removed from the trench and from around the pipes and placed in 55 gallon drums lined w!th plastic bags. Each drum was sampled and an isotopic analysis was performed to verify all contami-nated soil was removed from the area.

On Monday, February 4, 1980, additional soil samples were collected and results indicated no activity above background.

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On Wednesday, February 13, similar leaks were found in the 10" underground alumi-num pipe. All contaminated soil was collected and stored with previous collected soil.

Apoarent Cause of Occurrence The holes in the pipe were caused by excessive pitting due to galvanic corrosion.

Inadequate corrosion protection was provided during installation / construction.

Analysis of Occurrence Leakage of radioactive condensate from the underground aluminum piping into the soil occurred for an undertermined time period. Two (2) test borings to a depth of 30 feet were obtained to evaluate the extent of contaminated soil. The results of laboratory analyses on these samples are not yet available. Following replace-ment of the degraded piping, further excavation will be done to determine the extent of soil contamination. Based on previous experience with underground piping leaks in this sandy soil, it is expected that the activity will be con-centrated within a few feet of the pipe.

Corrective Action The analysis of a previous Reportable Occurrence 78-25 (10/31/78), concerning leaks in the bottom of the condensate storage tank, indicated that there is inadequate corrosion protection in the area. The current inspection of the under-ground aluminum pipes performed by Petro-Chemical Associates, Inc., reported severe pitting in all aluminum piping, especially near elbows.

All piping will be replaced this refueling outage. An evaluation is in progress to reroute the new piping. The piping will be double wrapped with an insulating tape. A sacrificial anode with a remote means of veri,fying ground current will be used as a secondary protection system.

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Failure Data The leaking pipes were 6" CH-4 condensate transfer pump suction line and the 10" CH-4 fire protection line. The other underground pipes scheduled to be replaced are:

12" CH-3 to core spray and CRD pumps.

4" WD-2 to demineralized water storage tank.