05000281/LER-1981-021-03, /03L-0:on 810302,svc Water Strainer for Air Conditioner Condenser a Found Clogged.Caused by Matl Entrained in Svc Water Sys.Strainer Cleaned

/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: 05000281/LER-1981-021, Forwards LER 81-021/03L-0 05000281/LER-1981-021-03, /03L-0:on 810302,svc Water Strainer for Air Conditioner Condenser a Found Clogged.Caused by Matl Entrained in Svc Water Sys.Strainer Cleaned
References
LER-81-021-03L-02, LER-81-21-3L-2, NUDOCS 8104070526
Download: ML18139B234 (2)

LER-1981-021, /03L-0:on 810302,svc Water Strainer for Air Conditioner Condenser a Found Clogged.Caused by Matl Entrained in Svc Water Sys.Strainer Cleaned

Event date:
Report date:
2811981021R03 - NRC Website

text

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NAC FORM366 LICENSEE EVENT REPORT U.S. NUCLEAR Rl:GlJI..ATORY COMMISSION ti-771.

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CONTFiO.. S:.OCK; l 10 (Pl.EASE PRINT OR TYPE ALL RECUIFIEC* INFORMATION!

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/ I L I© 60 61 DOCKET NUMBER 58 69 EVENT CATE 74 75 REPOR, OA, E BO EVENT OESC~IPTION AND PROBABL.E CONSEOUENC~S@)

i On March 3,1981, wit_h the Unit at Full Power and the 'C' A/C chiller out of service I)))) I. for a design change.

The service water strainer for the 'A' A/C Condenser was found to be clogged.

This event is contrary to T. S. 3.14.B and is t*eportable in accordance I

[]J]J I with T.S *. 6.6.2.b(2).

The redundant A/C chiller (l-,.VS-E-4B) maintained the control

[)))) I room temperature during this event.

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[§I?] I were no.t affected.

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SYSTEM CODE IA IA I@

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e ATTACHMENT 1 (PAGE l dF 1)

SURRY POWER STATION, UNIT 2 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

2.

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.

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

5.

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

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.