ML19263C335

LER 78-107/03X-1 on 781005: During Steady State 100% Power Operation,Found That Containment Atmosphere Particulate & Gas Monitoring Sys Were Inoperable.Caused by Repair of Pump 1-RM-159-B

ML19263C335
Person / Time
Site:	North Anna
Issue date:	02/14/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19263C332	List: ML19263C331 ML19263C334 ML19263C335 ML19263C337
References
LER-78-107-03X, LER-78-107-3X, NUDOCS 7902220006
Download: ML19263C335 (2)

Text

LICENSEE EV EO UPDATE REPORT - Previous Renort Date 11-02-78 CONTHOL BLOCK: {l 1

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OfJ EVEN1 Of.5CWPHON AND PROBABLE CONSEQUENCES h j o_[g lDuring steady state,100% power operation, it was discovered that the containment _j in ;3 ; jatraosphere particulate and gas iconitoring systems were inoperable T. S. 3.4.6.1 l o 4 jrequires tuo radioactivity monitoring systems operable. Reportable as per I o s [T.S. 6.9.1.9.b. ,

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43 44 47 CAUSE DESCHIPTION AND CORRECTIVE ACTIONS h i o [0n 10-5-78, the breaker to the containment atmosphere particulate and oas monitoring i i i [pumo, 1-RM-159-B was opened to facilitate repairs. Unknown to operatina nersonnol. I g [1-RM-159A, the alternate particulate and gas monitoring pump obtained power from the l

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Update Report - Previous Report Date 11-02-78 Virginia Electric and Power Company florth Anna Power Station, Unit flo.1

Attachment:

Page 1 of 1 k Docket flo: 50-338 Report flo: LER 78-107/03X-1 Description of Event:

Two pumps,1-Ril-159A & B are provided to collect air samples. Normally or.e pump is opera ting wi th one used as a spare.

On 10-5-78, the breaker to 1-RM-159B was opened to allow repairs on the pump. Unknown to operating personnel, the breaker to 1-RM-159B also supplied power to 1-RM-159A and power was lost to 1-RM-159A. Approximately two-(2) hours later, it was realized both pumps were secured. 1-RM-159B was repaired in this period and power restored to both pumps.

Probable Consequences of Occurrence:

The Reactor Coolant System leakage detection systcms required by T.S. 3.4.6.1, are provided to monitor and detect leakage from the Reactor Coolant Pressure Boundary. The loss of the radiation monitoring leakage detection portion of this system for approximately two hours, which was within the six hours Action Statement given in this specification, resulted in no danger to the operating personnel or the public.

Cause:

The design of the Particulate and Gas Monitoring System does not provide for separate power supplies to 1-RM-159A and B. Thus, isolating power to one motor isolates power to both motors.

Immediate Corrertive Action:

Restore power to the containment particulate and gas monitoring pumps.

Scheduled Corrective Action:

A means of providing separate power supplies to these pumps is presently bning investigated and will be implemented by means of a design change.

Action Taken to Prevent R_ecurrcnce:

flo action required.