ML20086G213

Environ RO 76-25:on 760504,three Cooling Towers Became Simultaneously Inoperable.Caused by Tower Lift Pump C Inadvertently Tripping During Bus Switching.Lubricating Water Lines Flushed & Lift Pump C & Tower Returned to Svc

ML20086G213
Person / Time
Site:	Peach Bottom, 05002787
Issue date:	05/14/1976
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
References
RO-76-25, NUDOCS 8401100117
Download: ML20086G213 (2)

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8 PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHIA PA.19101 (2151 e41-4000 May 14,1976 3I M

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Mr. Victor Stello, Jr. p j- '

Director el j-Division of Operating Reactors Office of Nuclear Reactor Regulations

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United States Nuclear Regulatory Comission Washington, D.C.

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Subject:

Environmental Deviation The following deviation was reported to Mr. Walt Baunack, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Comission on May 4,1976.

Reference:

License Number DPR-44/56 Environmental Technical Specifications: 2.1 Report No.: 50-277/278-76-25 Report Date: May 14, 1976 Deviation Date: May 4, 1976 Facility: Peach Bottom Atomic Power Station Units 2 and 3 -

R .D . 1, De l t a, PA 17314 Identification of Deviation:

Three cooling towers simultaneously inoperable.

Conditions Prior to Deviation:

Unit 3 operating at 56% power. Unit 2 off for a refueling outage. The "A" and "B" cooling towers out of service due to previous  ;

lift pump bearing failures. River flow was about 33,000 CFS. 1 l

Description of Deviation:

The "C" cooling tower was removed from service for 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />, making three cooling towers inoperable.

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8401100117 760514 PDR ADOCK 05000277 1 S PDR COPY SEN IN m

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, Mr.VictorSt(])),

May 14,1976 Jr. () 50-277/278-76-25 Paga 2 Designation of Apparent Cause of Deviation:

The "C" tower lif t pump was inadvertently tripped during bus switching. The lif t pump breaker would not reclose. Inve stigation showed a flow switch indicating loss of lube water to the lif t pump had become inoperative. The indication was caused by accumulation of sitt in lubricating water lines.

Analysis of Deviation:

Differential temperatures between the Pennsylvania-Maryland State Line and Holtwood Dam remained within Pennsylvania State limits.

Single unit operation and the short duration of the outage minimized the thermal impact of this deviation.

Correcti ve Action:

Lubricating water lines were flushed and the "C" lif t pump and tower returned to service on 5/4/76.

Failure Data:

Several previous occurrences.

Very truly yours,

/M. . Cooney Superintendent -

Generation Division-Nuclear i

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