ML20086G336
| ML20086G336 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 01/19/1976 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RO-76-3, NUDOCS 8401110228 | |
| Download: ML20086G336 (2) | |
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PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET PHILADELPHI A. PA.19101 1215)841 4000 lanuary 1), 1376 k'
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fir. J. P. O'Rei l ly Director, Region 1
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Of fice of Inspection and Enforcement 6;
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,3 U.S. fluclear Regulatory Commission
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Kin) of Prussia, PA 13406 7
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Dear Mr. O'Reilly:
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Shject: Envi_ronmental Devi ation_
The following deviation was reported to Mr. Walt Daunack, Office of Inspection and Enforcement, Region I, United States iluclear Re julatory Connission on January ', 1)76.
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Reference:
License Number GPR-M/35 Environm ntal Technical Opecifications:
2.1 Report no.:
50-277/27L76-3 Report Date:
January 17, 1976 Deviation Date: January 9, 1376 Facility:
Peach Bottom Atomic Power Station Units 2 6 3 R.D. 1, Ucita, Pennsylvania 17314 Identification of Deviation:
Operation of Unit 2 above 20% power with all cooling towers inoperable.
Conditions Prior to Deviation Both units shutdown. Severe cold weather and icing conditions.
Description of Deviation _:
Doth Units 2 and 3 were out of service for approximately 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> on January 3,1976. Air temperatures during this period of time were well below freezing and ice covering existed on large portions of the river and intake ponds. The water in the cooling tower suction ponds, therof ore, decreased in ter:perature to approximately 32 F.
8401110228 760119
'b PDR ADOCK 05000277 S
Mr. J. P. O ' R d hy 50-277/278-76-3
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January 19, 1976 Page 2 i
Decause of the cold air temperatures and the cold water existing in the j
cooling tower suction ponds, startup of the
'D' and 'C' cooling towers would have ccused severe icing and serious potential for damage to the cooling tewer structure with possibic tower collapse. Startup of these towers was therefore delayed until a body of warm water could be accumulated in the plant discharge pond.
In order to accumulate the warm water, QTit 2 sas placed in service and increased to approximately 45% power, using only I circulating water pump. This was done on the morning of Jcnuary ', 1976. At 4 p.m. on January 9,1976, during the
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warmest portion of the day, both B 6 C cooling tower lif t pumps were placed in service. Startup of the cooling tower f ans was delayed until January 10, 1976, at approximately 4 p.m. in order to minimize ice formation on the cooling structures. The A cooling tower was inoperable because of a previous f ailure of the cooling tcwcr lif t pump.
l Desiqnation of Apparent Cause of Ocviation:
Coolinj tower water intake temperatures were too low to f acilitate taver startup without causing damage.
i Analysis of Ocviation:
Cold weather tover operation provides a minimal benefit to the environment. Additionally, durin] the period in question, tho
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total plant output ranged from approximately 23Z to 334 power. The event therefore has minimal environmental impact.
Corrective Action:
i Hone required.
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Failure Data:
l No previous deviations of this type.
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Very truly yours, i
i M
J. Cooney Superintendent Generation Division-Nuclear cc: Mr. J. G. Davl s, HRC Mr. W. G. Mcdonald, NitC l
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