ML20248B681

Revised Proposed Tech Specs Re Combustible Gas Control

ML20248B681
Person / Time
Site:	Farley
Issue date:	09/25/1989
From:	ALABAMA POWER CO.
To:
Shared Package
ML20248B672	List: ML20248B668 ML20248B681
References
NUDOCS 8910030264
Download: ML20248B681 (2)

Text

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l 4, CONTAINMENT SYSTEMS l .

l BASES l

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3/4.6.3 CONTAINMENT ISOLATION VALVES The OPERABILITY of the containment isolation valves ensures that the containment atmosphere vill be isolated from the outside environment in the event of a release of radioactive material to the containment atmosphere or pressurization of the containment. Containment isolation within the time limits specified ensures that the release of radioactive material to the environment vill'be consistent with the assumptions used in the analyses for a LOCA.

l 3/4.6.4 COMBUSTIBLE GAS CONTROL The OPERABILITY of the equipment and systems required for the detection and control of hydrogen gas ensures.that this equipment vill be available to maintain the hydrogen concentration within containment below its flammable

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limit during post-LOCA conditions.. The. containment atmosphere post-accident sampling system can be used as an alternative to a hydrogen analyzer should a j hydrogen analyzer become . inoperable. Either recombiner unit (or the purge i system) is capable of contro111ng'the expected hydrogen generation associated with 1) zirconium-vater reactions, 2) radiolytic decomposition-of water and 3) corrosion of metals within' containment. These hydrogen control systems are consistent with the recommendations of Regulatory Guide 1.7, " Control of Combustible Gas Concentrations in Containment Following a LOCA," March 1971.

The hydrogen mixing systems are provided to ensure adequate mixing of the containment atmosphere following a LOCA. This mixing action vill prevent localized accumulations of hydrogen from exceeding the flammable limit.

FARLEY - UNIT 1 B 3/4 6-4 AMENDMENT.NO.

1 8910030264 890925 O DR ADOCK O

CONTAINMENT SYSTEMS BASES 3/4.6.3' CONTAINMENT ISOLATION VALVES' The OPERABILITY of the containment isolation valves ensures that the containment-atmosphere vill be isolated from the outside environment in the event of a release of radioactive material to the containment atmosphere or pressurization of the containment. Containment isolation within the time limits specified ensures that the release of radioactive material to the environment vill be consistent with the assumptions used in the analyses for a LOCA.

3/4.6.4 COMBUSTIBLE GAS CONTROL The OPERABILITY of the equipment and systems required for the detection and control of hydrogen gas ensures that this equipment will be available to maintain the hydrogen concentration within containment.below its flammable limit during post-LOCA conditions. The containment atmosphere post-accident sampling system can be used as an alternative to a hydrogen analyzer should a I hydrogen analyzer become inoperable. Either recombiner unit (or the' purge system) is capable of controlling the expected hydrogen generation associated with 1) zirconium-water reactions, 2).radiolytic decomposition of water and 3) corrosion of metals within containment. These hydrogen control systems are consistent with the recommendations of Regulatory Guide 1.7, " Control of Combustible Gas Concentrations in Containment Following a LOCA," March 1971.

The hydrogen mixing systems are provided to ensure adequate mixing of the containment atmosphere following a LOCA. This mixing action vill prevent localized accumulations of hydrogen from exceeding the flammable limit.

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FARLEY - UNIT 2 B 3/4 6-4 AMENDMENT NO.