ML040360416

Phase 3 SDP Analysis

ML040360416
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/14/2004
From:	NRC Region 4
To:
References
FOIA/PA-2003-0358
Download: ML040360416 (1)

Text

Phase 3 SDP Analysis Performance Deficiency

- ANO Unit 1 fire zone 99-M (North Electrical Switchgear Room) did not meet regulatory requirements for separation of electric cables and equipment of redundant trains of systems necessary to achieve post-fire safe shutdown, and there was lack of adequate procedures for manual actions to achieve post-fire safe shutdown following a fire in fire zone 99-M (or other identified fire zones equivalent to 99-M)

• Assumptions

- Red train cables are not protected with one-hour rated barrier, and are not separated from the Green train cables by a minimum of 20 feet distance free of intervening combustibles

- No automatic fixed fire suppression system

- Ionization detection system provides alarm in Main Control Room w Credit for fire brigade response and arrival at fire zone 100-N, which is adjacent to fire zone 99-M Heat release rates of 200-500 kW in fire modeling of duration and severity I.),-

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