ML20244C423
| ML20244C423 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 04/11/1989 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20244C426 | List: |
| References | |
| NUDOCS 8904200203 | |
| Download: ML20244C423 (1) | |
Text
A CONTAINMENT SYSTEMS BASES I
3/4. 6.1. 6 CONTAINMENT INTERNAL PRESSURE The limitations on primary containment to secondary containment differential pressure ensure that the primary containment peak pressure of 11.31 psig does not exceed the design pressure of 15.0 psig during LOCA i
conditions or that the external pressure differential does not exceed the design maximum external pressure differential of +0.8 psid. The limit of
-0.1 to +1.0 psid for initial positive primary containment to secondary containment pressure will limit the primary containment pressure to 11.31 psid which is less than the design pressure and is consistent with the safety analysis.
During refueling conditions, this differential pressure
.is monitored when opening 3/4" vent / drain valves to perform leak rate testing per Technical Specification 3.6.1.1.2.
See Bases for Technical Specification 3/4.6.1.1.
3/4.6.1.7 CONTAINMENT AVERAGE AIR TEMPERATURE The limitation on containment average air temperature ensures that the containment peak air temperature does not exceed the design temperature of 185 F during LOCA conditions and is consistent with the safety analysis.
3/4.6.1.8 DRYWELL AND CONTAINMENT PURGE SYSTEM The use of the drywell and containment purge lines is restricted to the 42-inch outboard and 18-inch purge supply and exhaust isolation valves. These valves will Iose during a LOCA or steam line break accident and therefore the site boundary dose guidelines of 10 CFR Part 100 would not be exceeded in the event of an accident during purging operations.
The term sealed closed as used in this context means that the valve is secured in its closed position by deactivating the valve motor operator, and does not pertain to injecting seal water between the isolation valves by a seal water system.
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Phu PERRY - Unit 1 B 3/4 6-2a Amendment No. 19 j
(Next page is B 3/4 6-3)