PNO-III-86-136, on 861117,283,000 Gallons of Water Lost from Condensate Storage Tank Following Maint on Valve.Caused by Breaking of Weld to HPCI Test Return Pipe.Radwaste Spill Occurred During Transfer of Spilled Water

PNO-III-86-136:on 861117,283,000 Gallons of Water Lost from Condensate Storage Tank Following Maint on Valve.Caused by Breaking of Weld to HPCI Test Return Pipe.Radwaste Spill Occurred During Transfer of Spilled Water

ML20214F599
Person / Time
Site:	Fermi
Issue date:	11/18/1986
From:	Guldemond W, Wright G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-86-136, NUDOCS 8611250362
Download: ML20214F599 (1)

PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-86-136 Date November 18, 1986 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without v:rification or evaluation, and is basically all that is known by the Region III [

staff on this date.

Facility: Detroit Edison Company Licensee Emergency Classification:

Fermi 2 Nuclear Power Plant Notification of an Unusual Event Newport, MI 48166 Alert "

Site Area Emergency Docket No. 50-341 General Emergency X Not Applicable

Subject:

283,000 GALLONS OF WATER LOST FROM CST During the early evening of November 17, 1986, the licensee began restoring the normal valve lineup for the HPCI test return line to the Condensate Storage Tank (CST), following mainten-ance on a manual valve. In the process of restoration, the normally open miniflow line valve

,r from the operating CRD pump was opened. The CRD miniflow path utilizes the HPCI test return

, line to return water back to the CST. This pressurized the return line to approximately 1400 psig because the CST isolation valve had yet to be opened. 1400 psig exceeded the pressure rating of the test return piping and caused the welded connection of the HPCI test return line at the bottom of the CST to break. The CST began to drain through the broken weld at approximately 50,000 gallons per hour.

At 7:30 p.m. (EST), the licenn e noticed a decreasing level in the CST, and immediately began emptying the tank by transferring water to the condensate return tank (CRT). The licensee managed to transfer approximately 100,000 gallons, however, approximately 283,000 gallons leaked into the area adjacent to the CST.

llThe water was contained in a dike surrounding the CST. The water was sampled by the licensee

' and no contamination was detected. Due to the porous nature of the ground around the CST, some of the water seeped under the dike into Lake Erie.

During the incident the Rad Waste system was also used as a collection point for water from the CST and CRT. While transferring water to this system, the waste surge and waste collector tank overflowed, causing a spill of radioactive water and resin in the Rad Waste area. The spill has beer / contained and cleaned up by the licensee with no release to the environment.

Thebnitwasincoldshutdownatthetimeoftheleak. The licensee is determining corrective action. Region III (Chicago) is following the-licensee's course of action.

The St, ate of Michigan has been notified.

The Headquarters D t' Officer was notified of this e ent at 10:40 p.m. (EST), November 17, 1986.

This informa i current as . 1:30 p.m. ovember 18 oo CONTACT: .W ht i j FTS 388-5695 FTS 38 -5574 DISTRIBUTION:

H. St. ED0 NRR E/W Willste Mail: ADM:DMB

' Chairman Zech PA IE NMSS DOT:Trans only Comm. Roberts ELD OIA RES Comm. Asselstine AE0D Comm. Bertthal Csw Car + SP /fdd Regional Offit.es f[Ch CA C INP0 t//8h NSACl[M g /h* h PDR Licensee: //,*

RIIIResident[O[ffice (Corp. Office - Reactor Lic. Only) 8611250362 861118 Region III PDt. *2.+G PWo.g . g _f3g Rev. November 1985 P OtL

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