ML20105A631

Ao:On 731017,Yuba Heat Transfer Corp Nfn 3/4-inch Nipple Connecting Emergency Svc Water Relief Valve to Containment Spray Heat Exchanger 1-3 Failed,Resulting in Water Leaking from HX Insulation.Caused by Saltwater Corrosion of Nipple

ML20105A631
Person / Time
Site:	Oyster Creek
Issue date:	10/26/1973
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8103041012
Download: ML20105A631 (2)

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Jersey Central-Power & Light Company .'3 -

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• N'ORRISTOWN,N.J.079c0 o'201-533 6111 es.ue o. ,ne .

General { , Pubhc Util.fies Corporation _.

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October 26, 1973 Hr. A. Giambusso Dcputy Director for Reactor Projects Ditectorate of Licensing United States Atomic Energy Commission

h'ashington, D. C. 20545

Dear Mr. Gimbusso:

Subj ect: Oyster Crock Stction llocket No. 50-239 f.nergency Sevice h'ater linat Exchsnaar This Ictccc sene. La icport a failure of a 3/4" nipple ccantcL!rn, the cotrgency service ww r (tube side) relief velve to 1 3 conteinrent sprr/

hent exchanger. This event is considered to be an abnormal occurrence ;s q defined in the Technical Specifications, paragtnpa 1.15D. Notification of 4 thir. cvent, as required by the Technical Specifications,.parnraph 6.6.2.t., l wm vado to AFC llegion I, Directorate of Regulatory Operations, verbcIly te Mr. E. Greet. nan on h'ednesday, October 17, 1973 cr.d by telecopict on Th rsit.7, Octcher 18, 1973.

Dur.ing suryci*1anec testing of .No. 2 containment sprey system, the opr tr. tor ascigaco

• c visunlly check the system not'.ced utter issuing from uader the ilX insulation, lic called the shift forenun who upo: closer e m:.ir.1-tien discovered water coming from the ser.In water relief valyc nipplc.

. Details of the heat exchanger are:  !

llanufceturer: Yuba Ilcat Transfer Corp.

Type: NFN

The causn of the nipple failure appears.to be saltwater corrosier. cf

. the nipple connecting the relief valve to the water box.

The remedial stepr taken were to shut dcun the No. 2 system and

- surveillt:nce t est the redundant No.1 system. The No. I system test was satisfactory. Itepairs were then made to the 1-3 heat exchanger by instellin; a nes nipple end bhshing. The nipple on the 1-4 !!X was remo.ed and insrecad

. and found t o be sound. Ar. a peccautic: 1ry r.casure, a new nipple ras instt1:ed.

The No.: -2 syst es ws satit.factorily tested and mJde operable.

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Mr. Giambusso October 26, 1973 V

Tho' significance of this event would be the loss of heat exchanger redundancy in one containment spray system. Proper. cooling' capacity is avail-abic with one set of pumps in one system. Tho No. 1 system hai' demons; rated availability of two sets of pumps along with its' associated heat exchangers.

To prevent a reoccurrence of.this type failure, the Yuba Heat Transfer Corp. will be contacted to:

a) Review the repair and recommend add'itional inspection and/or repair if deemed necessary. t b) Investigate the advisability of installing cathodic protection

• on the heat exchangers.

Enclosed are forty (40) copics of this report.

'Very truly yours, j,/,* ,,. }

To L. r .. / t.'4 - u -

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JQ[.G Donald A. Ross

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Manag<..r, Nuch.a. Cencratr.'g Statians 4

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IJr. J , P. O'Rcilly. Director F Directorato of Regulatory Operations, Region I s

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