ML20086G237
| ML20086G237 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/12/1976 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| RO-76-24, NUDOCS 8401100124 | |
| Download: ML20086G237 (2) | |
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PHILADELPHIA ELECTRIC COMPANY
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2301 MARKET STREET PHILADELPHIA PA.19101 if:. g 1215)841-4000
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May 12, 1976 E
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Mr. Victor Stello, Jr.
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Director Division of Operating Reactors
-N Office of Nuclear Reactor Regulations
/,9 United States Nuclear Regulatory Comission Washington, D.C.
20555
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Dear Mr. Stello:
Subject:
Environmental Deviation s'
The following deviation was reported ~to 14r. Walt Baunack,"
Region 1 Of fice of Inspection and Enforcement," United States Nuclear Regulatory Commission on May 2, 1976.
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Reference:
License Number DPR-44/56 2.1 s
Environmental Technical-Specification:
Report No.
50/277/278-76-24
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Report Date:
May 12, 1976 Deviation Date: May 2. 1976 Facility:
Peach Bottom Atomic Power Station Unit 2 and 3 R.D., Delta, PA 17314~
Identification of Geviation:
Two cooling towers simultaneously inoperable.
Conditions Prio> to Deviation:
Unit 3 operating at 70% power. Unit 2 off for refueling outage. The "A" tooling tower was out of service due to a previous lift pump bearing failure. The "C" cooling tower was fully operabic during the outage. River flow was about 39,000 CFS.
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Description of Deviation:
T An operator making his rounds saw water gushing from the door of the "B" lif: pump structure. The pump-was removed from service making two coollag towers inope.:able.
Designation of Apparent Cause of Deviation:
Bolts holding the suction bell housing to the pump casing f ailed, causing the housing to fall ~to the bottom of the lif t pump pit.
T The lif t pump discharge piping was cracke'd, and the base plate of the pump had shifted.
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Analysis of Deviation:
N Differential temperatures between the Pennsylvania-Maryland State and Holtwood Dam remain within Pennsylvania _ State limits. Single unit operation during this period minimized the' thermal impact of this deviation.
.,C_orrective Action:
Investigative work is continuing to determine the exact cause of failure. Expidited maintenance work !s in progress to return the lif t pump to service as promptly as possible. Philadelphia Electric Company Engineering Department and several consultants are involved in a co-ordinated effort to identify the cause of this failure and defermine a course of action to prevent recurrence of this type f ail-N ure.
e Failure D&ta:
A similar environmental deviation was reported in Environ-mental Deviation Report 50-277/278-76-9
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Very truly yours, N,
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Cooney Superintendent Generation Division-Nuclear g
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