ML20086G258

Environ RO 76-17:on 760314,two Cooling Towers Become Simultaneously Inoperable.Caused by Plugging of Lubricating Water Lines.Lubricating Water Lines Flushed.Investigation Continuing

ML20086G258
Person / Time
Site:	Peach Bottom
Issue date:	03/24/1976
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
References
RO-76-17, NUDOCS 8401100489
Download: ML20086G258 (2)

Text

.

O O PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHIA, PA.19101 (2153841-4000

,. g March 24, 1976 'N Mr. Victor Stello, Jr. *

, s Director 'ic s r Division of Operating Reactors < .

' N \(".'

Office of Nuclear Reactor Regulations ,'

United States Nuclear Regulatory Conunission s washington, DC 20555  : . .f

~ a.

Dear Mr. Stello:

l

Subject:

Environmental Deviation '

l The following deviation was reported to Mr. Walt Baunack, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Commission on March 15, 1976.

Reference:

License Number DPR-44/56 4 Environmental Technical Specifications: 2.1 Report No.: 50-277/278-76-17 Report Date: March 24, 1976 Deviation Date: March 14, 1976 Facility: Peach Bottom Atomic Power Station Units 2 and 3 R.D. 1, Delta, PA 17314 l

Identification of Deviation:

Two cooling towers simultaneously inoperable.

Conditions Prior to Deviation Unit 2 was operating at 1004 power, and Unit 3 was off.

l The "A" cooling tower was out of service due to a previous lift l pump failure. The "B" cooling tower was operable during the outage.

l River flow was approximately 56,000 CFS.

l Description of Deviations l On 3/14/76 the "C" cooling tower lift pump tripped.

l 8401100489 760324  !

PDR ADOCK 05000277 l S PDR COPY SEM G

O O ~

i l

Mr. Victor Stello, Jr. 50-277/278-76-17 .

l March 24, 1976 Page 2 l Designation of Apparent Cause of Deviation:

Plugging of the lubricating water lines, due to high silt content of the river caused by high river flow, resulted in tripping the lift pump.

Analysis of Deviation:

Differential temperatures between the Pennsylvania-Maryland State Line and Holtwood Dam remained within the Pennsylvania State limits. Low plant power production during this period and the short duration of the outage minimized the thermal impact of this occurrence.

Corrective Action:

The "C" lift pump was returned to service in less th&n 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> after flushing the lubricating water lines. The Philadelphia Electric Company Engineering Department has been requested to in-vestigate this problem.

Failure Data:

Several previous similar occurrences.

Very truly yours, M. . Cooney S rintendent Generation Division-Nuclear cc: Mr. J. P. O'Reilly NRC, Reg. Office N