ML20138D188
| ML20138D188 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 12/03/1985 |
| From: | CAROLINA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20138D166 | List: |
| References | |
| NUDOCS 8512130164 | |
| Download: ML20138D188 (2) | |
Text
.
(BSEP-1-72)
EMERCENCY CORE COOLING SYSTEMS BASES AUTOMATIC DEPRESSURIZATION SYSTEM (Continued)
ADS automatically controls 7 safety-relief valves although the hazards analysis only takes credit for 6.
It is therefore appropriate to permit one valve to be out-of-service indefinitely without materially reducing system reliability. Reactor operation is permitted to continue for up to 7 days with 2 safety relief valves inoperable except that HPCI is required to be demonstrated to be OPERABLE.
The surveillance requirements provide adequate assurance that ADS will be OPERABLE wher. required. Although all active components are testable during reactor operation, a complete functional test results in reactor blowdown and therefore is scheduled around shutdowns.
l 3/4.5.3 LOW PRESSURE COOLING SYSTEMS i
3/4.5.3.1 CORE SPRAY SYSTEM (CSS)
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The CSS is provided to assure that the core is adequately cooled following a loss-of-coolant accident. Two redundant loops each provide adequate core 2
cooling capacity for all break sizes from 0.2 ft up to and including the double-ended reactor recirculation line break, and for smaller breaks following depressurization by the ADS.
The CSS specifications are applicable during CONDITIONS 1, 2, and 3 because CSS is a primary source of emergency core cooling after the reactor vessel is depressurized.
When in CONDITION 1, 2, or 3 with one CSS loop inoperable, the demonstrated OPERABILITY of the redundant full capacity CSS loop and the full capacity Low Pressure Coolant Injection System provides assurance of adequate core cooling and justifies the specified 7-day out-of-service period.
The CSS specifications are applicable in CONDITIONS 4 and 5 to provide a source for flooding of the core in case of accidental draining.
j The specified volume of 150,000 gallons of water in the condensate storage tank will assure the availability of 50,000 gallons of water for the CSS since its suction is at the 100,000 gallons level. The 100,000 gallons is the minimum reserved for HPCI/RCIC operation.
8512130164 851203 i
PDR ADOCK 05000324 p
PDR 4
BRUNSWICK.- UNIT 1 B 3/4 5-2 Revised
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(BSEP-2-69)
EMERCENCY CORE COOLING SYSTEMS BASES AUTOMATIC DEPRESSURIZATION SYSTEM (Continued)
ADS automatically controls 7 safety-relief valves, although the hazards analysis only takes credit for 6.
It is therefore appropriate to permit one valve to be out-of-service indefinitely without materially reducing system reliability. Reactor operation is permitted to continue for up to 7 days with 2 safety-relief valves inoperable except that HPCI is required to be demonstrated to be OPERABLE.
The surveillance requirements provide adequate assurance that ADS will be OPERABLE when required. Although all active components are testable during reactor operation, a complete functional test results in reactor blowdown and, therefore, is scheduled around shutdowns.
3/4.5.3 LOW PRESSURE COOLING SYSTEMS 3/4.5.3.1 CORE SPRAY SYSTEM (CSS)
The CSS is provided to assure that the core is adequately cooled following a loss-of-coolant accident. Two redundant loops each provide adequate core 2
cooling capacity for all break sizes from 0.2 ft up to and including the double-ended reactor recirculation line break, and for smaller breaks following depressurication by the-ADS.
The CSS specifications are applicable during CONDITIONS 1, 2, and 3 because CSS is a primary source of emergency core cooling after the reactor vessel is depressurized.
When in CONDITIONS 1, 2, or 3 with one CSS toop inoperable, the demonstrated OPERABILITY of the redundant full capacity CSS loop and the full capacity Low Pressure Coolant Injection System provides assurance of adequate core cooling and justifies the specified 7 day out-of-service period.
The CSS specifications are applicable in CONDITIONS 4 and 5 to provide a source for flooding of the core in case of accidental draining.
The specified volume of 150,000 gallons of water in the condensate storage tank will assure the availability of 50,000 gallons of water for the CSS since its suction is at the 100,000 gallons level. The 100,000 gallons is the minimum reserved for HPCI/RCIC operation.
l BRUNSWICK - UNIT 2 B 3/4 5-2 Revised i
E