ML13331B199
| ML13331B199 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/03/1989 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML13331B197 | List: |
| References | |
| NUDOCS 8907100092 | |
| Download: ML13331B199 (2) | |
Text
ATTACHMENT 2 PROPOSED TECHNICAL SPECIFICATION 3.20 OVERPRESSURE PROTECTION SYSTEMS APPLICABILITY:
Applies to operability of the overpressurization protection systems.
OBJECTIVE:
To preclude the potential for exceeding 10 CFR 50, Appendix G, in the event of a pressure transient while water-solid.
SPECIFICATION:
A.
When the RCS pressure is a 400 psig* and pressurizer water level is greater than 50%,
at least one of the following overpressure protection systems shall be operable:
(1) Two power operated relief valves (PORVs) with a lift setting of < 420 psig,** or (2) A reactor coolant system vent(s) of > 1.75 square inches.
B.
With one PORV inoperable when required in accordance with Specification A above, either restore the inoperable PORV to operable status within seven days or depressurize and vent the RCS through a 1.75 square inch vent(s) within the next eight hours; maintain the RCS in a vented and tagged condition until both PORVs have been restored to operable status.
C.
With both PORVs inoperable when required in accordance with Specification A above, depressurize and vent the RCS through at least a 1.75 square inch vent(s) within eight hours; maintain the RCS in a vented and tagged condition until both PORVs have been restored to operable status.
D.
In the event either the PORVs or the RCS vent(s) are used to mitigate a potential RCS pressure transient, a Special Report shall be prepared and submitted to the Commission pursuant to Specification 6.9.2 within 30 days. The report shall describe the circumstances indicating transient, the effect of the PORVs or vent(s) on the transient and any corrective action necessary to prevent recurrence.
- The placing in service of the OMS at < 400 psig is intended to assure that protection is provided whenever temperature is below 360*F. The alarm to arm the OMS being keyed to pressure assures that inadvertent opening of the PORVs does not occur due to placing the OMS into service with RCS pressure above the 420 psig initiation setpoint.
- The 420 psig setpoint is based on the current heatup and cooldown curves for 16 EFPY. The setpoint requires reevaluation for acceptability any time the curves are changed.
SAN ONOFRE - UNIT 1