ML20056H043

Proposed Tech Specs Revising TS 3/4.6.4.3 Re Containment Hydrogen Dilution Sys & Associated Bases

ML20056H043
Person / Time
Site:	Davis Besse
Issue date:	08/30/1993
From:	CENTERIOR ENERGY
To:
Shared Package
ML20056H038	List: ML20056H037 ML20056H042 ML20056H043
References
NUDOCS 9309080125
Download: ML20056H043 (2)

Text

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Docket Number 50-346 ~

License Number WPF-3 Serial Number 2139 l Attachment l

- Page 5 j CCNTAINMENT !?!TEuS ,

CONTAINMENT WYDROGEN OTLUTTCN 5YSTEM l

LIMITING CCNDITION FOR OPERATION l i

1.6.4.3 Two'inoeoeneent containment hydrogen cilution systems snall te OPERABLE.

APPLICABILITY: MODES 1 and 2. -

ACTION.

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/ ti ,')With one containment nyorogen dilution system inocereole, restore tnet

/ ) inoperable system to OPERABLE status within 30 days or ce in at least(

t yDTY H within tne next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. ~

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I 4.6.4.3 Each containment hydrogen dilution system shall be demonstrated  !

OPERABLE at least once per 9Z days on a STAGEEED TEST BASIS by: .

a. Verifying that the system can be started on operator action in the control room, and

b. Verifying ttat the system operates for at least 15 minutes ano the blauer envelops a discW pmssure of 15 psig.

1 DAVIS-bel 1E. UNIT 1 3/4 6-25 93090B0125 DR 930830  :

p ADOCK 05000346 0

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Docket Number 50-346 License Number NPF-3 i Serial Number 2139 Attachment  ;

! \ Page 6 l ,

i CCNTAINMENT SYSTEMS l -

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= AS -  :

,t i il i j !3 /4. 6. 4 CCMBUSTIBLE GAS CONTROL l The OPERABILITY of the Hydrogen Analyzers, Containment Hydrogen l ll Dilution System, and Hydrogen Purge System ensures that this equipment  !

1 will be available to maintain the maximum nydrogen concentration within

the containment vessel at or below three volume percent following a LOCA.  !

} The two reoundant Hydrogen Analyzers determine the content of hyoro- l 1 gen within the containment vessel. The Hydrogen Analyzers, althougn they  ;

. have tneir OPERABILITY reovirements in this Specification, are considerno  !

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part of the post-accident monitoring instrimentation of Specification  !

3/4.3.3.5, Post-Accident Monitoring Instrumentation.  !

' l The Containment Hydrogen Dilution (CHD) System consists of two full  ;

j cacacity, recundant, rotary, positive displacement type blowers to supply i air to the containment. The CHD System centrols the hydrogen concentra- I

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tion oy the modition of air to the containment vessel, resulting in a f pressurization of the containment and suppression of the hydrogen volume r

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j J The Containment Hydrogen Pur1te System Filter Unit functionsles-e-  !

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l ~ .'tfie ERD systsa aw Os casigneo to release air from the co'nN  !

atmosphere through a HEPA filter and charcoal filter prior to l

< i 1, f_Alignarge to the station vent.

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} ( SHIELD BUILDING /  ;

f 'N6.5 I

j [ 3/4.6.5.1 EMER5ENCY VENTILATION SYSTEM

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f The OPERABILITY of the emergency ventilation systems ensures that i [ containment vessel leakage occurring during LOCA conditions into the t  !

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annulus will be filtered througn the HEPA filters and charcoal adsorber i j i trains prior to discharge to the atmosphere. This reouirement is neces-  !

f sary ta atest the assianotions used in the safety analyses and limit the l

! ( site bouncary radiation deses to within the limits of 10 CFR 100 during

1  ; LOCA conoitions.

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DAVIS-BEIIE, UNIT 1 B 3/4 6-4 Amenaient No. A6,157

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