ML20085G221

Deficiency Rept Re Certain Single Failures in Piping Sys of Control Bay Air Conditioning Equipment That Could Result in Loss of Cooling Water to All Control Bay Cooling Equipment. Seismically Qualified Piping & Valves Will Be Added

ML20085G221
Person / Time
Site:	Browns Ferry
Issue date:	01/20/1975
From:	Gilleland J TENNESSEE VALLEY AUTHORITY
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20085G220	List: ML20085G210 ML20085G221
References
NUDOCS 8308240663
Download: ML20085G221 (2)

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Ca ENCLOSURE BROWNS FERRY NUCLEAR PIMiT UNITS 1 AND 2 NONROUTINE 30-DAY REPORT Description of Occurrence Certain single failures in the piping system of the centrol bay air conditicning equipment (CBACE) could result in the less of coeling water to all control bay cooling equipment.

Causes of Deficiency The deficiency arises due to the fact that the normal and emergency water supplies to the centrol bay chillers share a cc::: mon distribution header. The discharga lines have a similar situation.

Safety Implicatiens Since the operability of the control bay air conditioning equipment c:ast be assured, system separaticn will be desirable to increase reliability. This will require a provisicn for separate operation of the emergency ennling aquiprant f'e nm +ba nneral centrol hay a.f r conditioning system.

Corrective Measures Seismically qualified piping and valves will be c.dded to the existing system to cbtain the desired separatien. This involves ccnnecting the EECW water supply directly to the e.cergency chiller and providing separate discharge piping frcr. this chiller into the EECW discharge f conduit. ECN-L1321 was issued to make these desi 6 n changes. Corrective measures will be implemented by March 15, 1975 s

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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ot January 20, 1975 ef'p.b

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Mr. Edson G. Case ,  :< r Acting Director of Licensing ". , /

Office of Regulation

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U.S. Atonic Energy Consission Uashington, DC 20545 IU; g:pu !'gf'i[) v,

Dear Hr. Case:

TENNESSEE VALLEY AUTHORITY - BROUNS FERRY I!UCLEAR PLANT UNITS 1 AND 2 - DOCRET MOS. 50-259, 50-260 - FACILITY OPERATII;G LICENSE DPR-33, DPR-52 The enclosed report, submitted as required by Browns Ferry Nuclear Pl?nt Technical Specification 6.7.2.B(3),

is to provide de ails concerning Browns Ferry's units 1 and 2 control bay air conditioning equipaent. It was dine :: cd :: I' :::bar 19, 1974, that th: centr:1 bay air conditiening equipment could be disabled by a single failure. .

Very truly yours, i--n J. E. Gilleland Assistant to the Manager of Power Enclosure CC (Enclosure):

Mr. Norman C. Moseley, Director Directorate of Regulatory Operations U.S. Atonic Energy Cocaission Region II - Suite 818 230 Peachtree Street, IN.

Atlanta, Georgia 30303 o o l

,1 y 757 An Equal Opportunity Employer WPY bENf AttuluN