ML20086K305

Environ RO 74-5:on 741104,cooling Tower Availability Found Not in Accordance W/Tech Specs.Caused by Pump Suction Bell & Lower Guide Bearing Becoming Detached.Corrective Actions to Be Determined After Investigation

ML20086K305
Person / Time
Site:	Peach Bottom
Issue date:	11/14/1974
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
RO-74-5, NUDOCS 8401260453
Download: ML20086K305 (2)

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PHILADELPHIA ELECTRIC COMPANY j- -

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M (215)8414o00 November 14, 1974 Mr. A. G iambusso Deputy Director of Reactor Projects -

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United States Atomic Energy Conmission Directorate of Licensing Washington, DC 20545

Subject:

Environmental Deviation .

The following deviation was reported to Mr. Walt Baunack, A.E.C. Region i Regulatory Operations Office on November 5,1974. In '

accordance with Section 7 4.2.A of the Environmental Technical Speci-fications, Appendix B of DPR-44/56 for Units 2 and 3 Peach Bottom Atomic .

Power Station, the following report is being submitted to the Directorate of Licensing as an Environmental Deviation. '

Reference:

License Number DPR-44/56 Environmental Technical Specifications Appendix B Section 2.1 Report No.: 50-277/278-74-5 ^

Report Date: November 14, 1974 Deviation Date: November 4, 1974 Facility: Peach Bottom Atomic Power Station e Units 2/3 R.D. 1, Delta, Pennsylvania Identification of Ceviation:

! Cooling tower availability not in accordance with Specification 2.1 of Appendix 0, Operating License DPR-44 and DPR-56.

Conditions Prior to Deviation: .

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Unit 2 reactor shutdown. Unit 3 reactor at approximately 68%

power. These conditions were mai.:tained during the period when only one cooling tower was operable. (See Description of Deviation below)

Description of Deviation:

On the evening of November 4, 1974, the 'B' cooling tower lift pump tripped, removing the 'B' cooling tower from service. The duration ,

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$s t9 A Mr. A. Giambusso 'v' CL - . I November 14, 1974 Page 2 of the outage of the 'B' tower is not known at this time because full investigation of the malfunction is still in progress. As soon as our i nve s t ig a t ion. i s comp le te , further information in this regard will be provided. The average river flow at the time of the failure was less than 10,000 cfs. Preliminary investigation indicated that the failure was possibly related to the condition of the intake screens. The two remaining cooling towers were sequentially removed from service to per-mit inspection and minor repairs. Continuous operation of two cooling towers was re-established on the evening of November 8,1974.

Ichthyological Associates reports that their surveillance of the Conowingo Pond during this period indicated no adverse af fects to

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l plankton and fishes. Temperature distribution did not vary signifi- j cantly. I Designation of Aoparent Cause of Deviation:

Preliminary investigation indicates the pump suction bell and laver guide bearing became detached causing ultimate f ailure of the pump.

, Corrective Action:

To' avoid a similar failure on the other two cooliny tower s, the towers were removed from service and the pump suction bell and j

, intake examined by a diver.

1 Dismantiing and investigation of the 'B' lift pump to deter-mine necessary corrective action is in progress. ,

l Surveillance of plankton and, fishes, as well as therma l moni-toring of Conowingo Pond is continuing.

Failure Data: '

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An enviror. mental deviation involving. Section 2.1 was reported l in Environmental Deviation Report 50-277/278-74-4. '

l Very truly yours, )

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Ass ,' t Gen ' t Super intendent

. Cooney -

Generation Division I cc: Mr. J. P. O'Reilly I Director, Region i United States Atomic Energy Commission 631 Park Avenue King of Prussia, PA 19406 )

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