ML19343D165

LER 81-005/01T-0:on 810324,determined That Time Stipulated in FSAR Section 9.2.1.3 for Operator Action in Accident Involving Svc Water Pond Dam Break & Limiting Active Failure Is Not Accurate.Caused by Design Error

ML19343D165
Person / Time
Site:	Farley
Issue date:	04/06/1981
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19343D164	List: ML19343D163 ML19343D165
References
LER-81-005-01T, LER-81-5-1T, NUDOCS 8104090652
Download: ML19343D165 (2)

Text

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7 8 60 61 COCKET NUMBER 68 69 EVENT OATg 74 EVENT DESCRIPTION ANo PROBABLE CONSEQUENCES h E I Based on a 3-24-81 evaluation of river water system flow tests, it was determined that i F5Til i under a certain postulated accident condition involving a service water pond dam break.J h l coupled with the single most limiting active failure (i.e. loss of one train of river i O s I water), the time stipulated in FSAR section 9.2.1.3 for operator action is not availablel F6Td l i FSAR section 9.2.1.3 states that there will be at least 30 minutes following a loss of l O 7 l pond dam and loss of one train of river water for the operator to take action to balancel g i service water requirements with river water supply. The test results evaluation ..... l

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33 34 35 40 42 cAuSE DESCRIPTION AND CORRECTIVE ACTIONS h l1 :O l l This occurrence was caused by a design error. In order to increase the tire available I g l for operator action, a design change to provide an additional source of water 'to the I m I service water pumps under the postulated accident condition is being imolemented. Thisl g g design change will add a service water supply line with necessary valves, control logic,1 ii g , ; etc. from the service water / pond recirculation line to the service water wet' pit. I

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...i LER NO. 81-005/0lT-0 EVENTDESCRIPTIONANDPROBABLECONSEQUENCES(Continued)

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indicates that the operator would have approximately 20 minutes available to take action to balance service water flow with river water flow if both units were-operating and.the postulated accident condition occurred.

This report is being submitted in accordance with Unit 1 Technical Specifi-cation 6.9.1.8.1 and Unit 2 Technical Specification 6.9.1.12.1.

The health and safety. of the public have not been affected by this occurrence.

4 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (Continued)

The design change will be implemented by mid-May, 1981.

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