ML20086G365

RO 75-23:on 751015,cooling Tower C Removed from Svc for Maint.Caused by Excessive Nitrogen Leakage from Fire Detection Sys.Accessable Connections on Nitrogen Piping Repaired

ML20086G365
Person / Time
Site:	Peach Bottom
Issue date:	10/24/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Boyd R Office of Nuclear Reactor Regulation
References
RO-75-23, NUDOCS 8401110268
Download: ML20086G365 (2)

Text

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, PHILADELPHIA ELECTRIC COMPANY

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2301 M ARKET STREET ,

PHILADELPHI A, PA.19101 .,

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1215) 841-dooo October 24, 1975 Mr. Roger S. Boyd, Acting Director  !

Division of Reactor Licensing Of fice of Nuclear Reactor Regulations United States Mucicar Regulatory Commission Wa s hi ng ton, D.C. 20555 ,

Dear Mr. Doyd:

Subicet: Envi ronmental Deviation The following deviation was reported to Mr. Walt Baunack, Office of Inspection and Enforcenent, Region 1, United States Nuclear Regulatory Conmission on October 15, 1975.

Reference:

License Number DPR-44/56 Envi ronmental Technica l Speci fications: 2.1 Report No.: 50-277/278-75-23 Report Date: October 24, 1975 Deviation Date: October 15, 1975 Faci li ty: Pcech Bottom Atomic Power Station Units 2 and 3 R.D. #1, Delta, Pennsylvania 17314 Identi fication of Deviation:

Removal of cooling tower for maintenance.

Condi tions Prior to Deviation:

Both units operating at a nominal 55% power. The 'A' cooling

, tower was out of service because of a previous lif t pump bearing failure.

Description of Deviation:

Maintenance of the fire detection system piping on the 'C' cooling tower requi red removal of the tower f rom service for a period of approximately 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> on October 15, 1975.

Designation of Apparent Cause of Deviation:

Excessive ni trogen leakage from the fire detection system piping on the 'C' cooling tower was responsible for alarms approximately every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. The tower was removed from service for approximately 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> on October 15, 1975 to accommodate maintenance work to reduce the ~

alarm frequency. ' 1"' 3 i 8401110268 751024 i

PDR ADOCK 05000277 S PDR rnov MNT REGION ' .a -

Mr. Roger S. Boyd O O .  :

50-277/278-75-23 October 24, 1975 Page 2 Analysi s of Deviation:

Since river flows during the time interval were approximately

C 28,000 CFS and no significant change in plant differential temperature was experienced, the removal of this tower from service had no signif-

, icant envi ronmenta l effect.

Corrective Action:

Inspection of the nitrogen piping associated ud th the fire detection system indicated numerous leaking connections. The access-I i

able connections were repaired and resulted in reducing the frequency of alarms due to low nitrogen pressure to once per day.

Failure Da ta:

There have been no previous maintenance outages required i

because of the fire detection system.

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~ Very truly yours, M. ' Cooney S erintendent Generation Div.-Nuclear cc: Mr. James P. O'Rei lly, Di rector, Region 1 i Office of Inspection and Enforcement

United States Nuclear Regulatory Commission i 631 Park Avenue King of Prussia, PA 19406 4

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