ML18139B234

LER 81-021/03L-0:on 810302,svc Water Strainer for Air Conditioner Condenser a Found Clogged.Caused by Matl Entrained in Svc Water Sys.Strainer Cleaned

ML18139B234
Person / Time
Site:	Surry
Issue date:	04/01/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B233	List: ML18139B232 ML18139B234
References
LER-81-021-03L-02, LER-81-21-3L-2, NUDOCS 8104070526
Download: ML18139B234 (2)

Text

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ATTACHMENT 1 (PAGE l dF 1)

SURRY POWER STATION, UNIT 2

- e DOCKET NO: 50-281 REPORT NO: 81-021/03L-0 EVENT DATE: 03-02-81 TITLE OF EVENT: 1-VS-E-lfA INOPERABLE

1. DESCRIPTION OF EVENT:

On March 3, 1981, with Unit Two at 100% power and the 'C' control room air conditioner chiller out of service for a design change, the service water strainer for the 'A' air conditioner condenser was found to be clogged. The chiller was removed from service and the strainer cleaned. This is contrary to Tech. Spec. 3.14.B and is reportable per Tech. Spec. 6.6.2.b.(2).

In addition, the unit was required to be placed in hot shutdown within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> as per Tech. Spec. 3. 0 .1. However, the strainer was cleaned and repaired in three hours, and a unit shutdown was not initiated.

2. PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT SYSTEMS:

The Control Room ventilation system contains three 100% capacity air condi-tioning units. Tech. Spec. 3.14, not being consistent with the philosophy used for other LCO's, requires 2 of 3 air conditioning condensers to be operable whenever fuel is.loaded in the reactor core. Since the control room environment was maintained within the design parameters and the redundant air conditioning unit was returned to service within three hours, the health and safety of the public were not affected.

J. CAUSE:

Materials entrained in the service water system clogged the chiller's inlet strainer. An upstream self-cleaning strainer had been removed from service to perfor,m modifications in accordance with a design change.

4. IMMEDIATE CORRECTIVE ACTION:

The 'B' air conditioning chiller was verified operating and maintaining the required environment within the control room.

5. SUBSEQUENT CORRECTIVE ACTIONS:

The service water strainer was cleaned and returned to service, and the upstream self-cleaning strainer has been refurbished and returned to service.

6* ACTION TAKEN TO PREVENT RECURRENCE:

The actions taken above are considered adequate.

7. GENERIC *IMPLICATIONS:

None.