ML20126D898

Proposed Tech Specs Revising TS 3/4.6.4.3 Containment Hydrogen Dilution Sys & Associated Bases 3/4.6.4,Combustible Gas Control,To Add an Addl Action Statement to Apply When Both Sys Inoperable & Allow 72 H to Return Sys to Normal

ML20126D898
Person / Time
Site:	Davis Besse
Issue date:	12/21/1992
From:	CENTERIOR ENERGY
To:
Shared Package
ML20126D861	List: ML20126D858 ML20126D889 ML20126D898
References
NUDOCS 9212280214
Download: ML20126D898 (2)

Text

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Docket Number 50-346 License Number NPF-3 l

Serial Number 2071

'A'ttachment Page 5 11 CONTAINMENT SYSTEug CONTAINMENT WYOROGEN DILUTTON SYSTEM i-LIMITING CONDITTON FOR OPERATION 1.6.4.3 Two'indecencent containment hydrogen dilution systems shall be OPERABLE.

APPLICABILITY: MODES 1 and 2.

l ACTION:

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ci, ?With one containment nyorogen dilution system inocersole. restore tne /

inoperable system to OPERA 8LE status within 30 days or ce in at least j

%AN08Y_within_the 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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1 4.6.4.3 Each containment hydrogen dilution system shall be demonstrated OPERABLE at least once per 92 days on a STAGGERED TEST BASIS by:

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Verifying snat the system can be started on coerator action l

in the control room, and i

b.

Verifying that the system operates for at least 15 minutes and l

the blower develops a discharge press re of 15 psig.

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f DAVIS-BESSE. UNIT 1 3/4 6-25 9212280214 921221 PDR ADOCK 05000346 P

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Docket Number 50-346 License Number NPF-3 Serial Numbar 2071 Attachment Page 6 CONTAINMENT SYSTEMS 4

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. BASES i

3/4.6.4 COMBUSTIBLE GAS CONTROL j

The OPERABILITY of the Hydrogen Analyzers, Containment Hydrogen 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 redundant Hydrogen Analyzers determine the content of hydro-gen within the containment vessel. The Hydrogen Analyzers, although they have their OPERABILITY requirements in this Specification, are considered part of the cost-accident monitoring instrumentation of Specification 3/4.3.3.5, Post-Accident Monitoring Instrumentation.

The Cont'ainment Hydrogen Dilution (CHD) System consists of two full capacity, redundant, rotary, positive displacement type blowers to sucoly air to the containment. The CHD System controls the hydrogen concentra-i tion by the addition of air to the containment vessel, resulting in a pressurization of the containment and suppression of the hydrogen volume i

fraction.

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j The Containment Hydrogen Purge System Filter Unit functions}ee-t-I

$_ kd6 3'the CFID systMiWiTdesigned to release air from the cofi-~"

l ta'iMeist atmosphere through a HEPA filter and charcoal filter prior to l

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g 3/4.6.5 SHIELD BUILDING

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3/4.6.5.1 EMERGENCY VENTILATION SYSTEM The OPERABILITY of the emergency ventilation systems ensures that

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containment vessel leakage occurring during LOCA conditions into the-j

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annulus will be filtered through the HEPA filters and charcoal adsorber l

trains prior to discharge to the atmosphere. This requirement is neces-1 sary ta meet the assumptions used in the safety analyses and limit the site bouncary radiation doses to within the limits of 10 CFR 100 during LOCA conoitions.

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L DAVIS-BESSE, UNIT 1 B 3/4 6-4 Amenament No. 46,167 n,

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