ML20246L542
| ML20246L542 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/01/1989 |
| From: | TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML20246L531 | List: |
| References | |
| NUDOCS 8909060349 | |
| Download: ML20246L542 (2) | |
Text
5ocketNumber50-346
,?% ~ License Number NPF Serial' Number 1712 v:.... Attachment Page 1 r
3/4.3 INSTRUMENTATION BASES REMOTE SHUTD0hfN INSTRUMENTATION (Continued)
HOT STAND 8Y of the facility from locations outside of the control roan.
l This capability is required in the event control room habitability is lost.
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l 3/4.3.3.6 POST-ACCIDENT INSTRUMENTATION
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The OPERABILITY of the post-accident instrumentation ensures that suffi-cient infomation is available on selected plant parameters to monitor and assess these variables following an accident.
3/4.3.3.7 CHLORINE DETECTION SYSTEMS - Deleted e
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drep A%2ns-y' 3/4.3.3.8 FIRE DETECTION INSTRUMENTATION
- 0perability of the fire detection instrumentation ensures that adequate warning capacility is available for the prompt detection of fires.
This capability is required in order to detect and locats fires in their early stages.
Prompt detection of dires will reduce the potential
- for damage to safety related equipment ard is an integral element in the overa11' facility fire protection program.
In the event that a portion of the fire detection instrumentation is inoperable, the estabitshment of frequent fire patrols in the affected areas is required to provide detection capability until the inoperable instrumentation is restored to OPERABILITY.
1 DAVIS-BESSE UNIT 1 B 3/4 3-3 Amendment No. 7,58,12,134 f[f0$$$$[ $h.0$$b446 p
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k--Docket Number 50-346
.( N, License Number NPF-3 Serial Number 1712
' Attachment-Page 2 p
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CONTAINMENT SYSTEMS BASES 3/4.6.4 COMBUSTIBLE GAS CONTROL The OPERABILITY of the Hydrogen Analyzers, Containment Hydrogen Dilution System and Hydrogen Purge System ensures that this equipment will be available to maintain the maximum hydrogen concen'tration within the containmen't 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..f The Containment' Hydrogen Dilution (CHD) System consists of two full capacity, redundant, rotary, positive displacement type blowers to supply air to the containment. The CHD System controls the hydrogen concentra-tion 'y thE sddition-Of air to the e,ontainment vessel, resulting in a u
pressurization of the containment and suppression of the hydrogen volume f
fraction.
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The Containment hydrogen Purge System Filter Unit functions as a backup to the CHD System and is designed to release air from the con-tainment atmosphere through a HEPA filter and charcoal filter prior to discharge to the station vent.
3/4.6.5 SHIELD BUILDING i
3/4.6.5.1 - EMERGENCY VENTILATION SYSTEM The OPERABILITY of the emergency ventilation systems ensures that containment vessel leakage occurring during LOCA conditions into the annulus will be filtered through the HEPA filters and charcoal adsorber trains prior to discharge to the at:nosphere. This requirement is neces-sary to meet the assumptions used in the safety analyses and Mmit the site boundary radiation doses to within the limits of 10 CFR 100 during LOCA conditions.
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' DRVIS-BESSE, UNIT 1 B 3/4 6-4 Amendment No. 56 1
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