ML20086G243

Environ RO 76-22:on 760428,two Cooling Towers Became Simultaneously Inoperable.Caused by Accumulation of Silt in Lubricating Water Lines.Lines Flushed & Lift Pump C & Cooling Tower Returned to Svc

ML20086G243
Person / Time
Site:	Peach Bottom
Issue date:	05/07/1976
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
References
RO-76-22, NUDOCS 8401100169
Download: ML20086G243 (2)

Text

---.. - -.. . - .. -. .- . .. .

O O m .

PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET ,

PHILADELPHIA. PA.19101 121518414000 4g)(At/

3~'

May 7, 1976 p fJf  ;

pf?]J py

a. %k . ~A m.<

Mr. Victor Stello, Jr. .i O/g ,^ j Director \g f f Division of Operating Reactors Office of Nuclear Reactor Regulations 9 %.

United States Nuclear Regulatory Commission / ':0 f'

{

Washington, DC 20555 '

Subject:

Environmental Deviation The following deviation was reported te Mr. Walt Baunack, i Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Commission on April 28, 1976.

Reference:

License Number DPR-44/56 Environmental Technical Specifications: 2.1 P.eport No.: 50-277/278-76-22 Report Date: May 7, 1976 Deviation Date: April 28, 1976 I Facility: Peach Bottom Atomic Power Station Units 2 and 3 l R.D. 1, Delta, PA 17314  !

t Identification of Deviation: '

I hro cooling towers simultaneously inoperable.

Conditions Prior to Deviation:

Unit 3 operating at full power. Unit 2 off for a refueling outage. The 'A' cooling tower was out of service due to a previous lift ptanp bearing failure. The 'B' cooling tower was fully operable during the outage. River flow vas about 23,000 CFS.

Description of Deviation:

The 'C' cooling tower lift pump tripped, making two cooling towers inoperable.

1

' 8401100169 760507 PDR ADOCK 05000277 '

s eDR

,g7 )

i l

04'Y SENT EnXnoN s1 _

' -. ~ . _ . . . _ _ . _ _ _ . . . _ - . __._.s ._ _ . _ _. _ i

• Mr. Victor Stollo, Jr. 50- 7/278-76-22 -

. May 7, 1976 Page 2 ,

Designation of Apparent Cause of Deviation:

A flow switch indicated loss of lube water to the lift pump.

The indication was caused by accumulation of silt in the lubricating l i

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 l the thermal impact of this deviation.  ;

Corrective Action: f The lubricating water lines were flushed and the 'C' lift pump and cooling tower were returned to service on 4/28/76. p Failure Data: l:

Several previous similar occurrences.

Very truly yours, M. Cooney Su rintendent Generation Division-Nuclear cc: Mr. J. P. O'Reilly NRC, Reg. Office 8

i.

s i

i i

.____________3