ML20086E687
| ML20086E687 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 07/06/1995 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20086E693 | List: |
| References | |
| NUDOCS 9507120175 | |
| Download: ML20086E687 (1) | |
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 105 TO FACILITY OPERATING LICENSE NO. DPR-80 MLAMENDMENT N0.104 TO FACILITY OPERATING LICENSE NO. DPR-82 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON NUCLEAR POWER PLANT. UNITS 1 AND 2 DOCKET NOS. 50-275 AND 50-323
1.0 INTRODUCTION
By letter dated April 19, 1995, the Pacific Gas and Electric Company (PG&E or the licensee) proposed changes to the Technical Specifications (TS) for Diablo Canyon Nuclear Power Plant, Units 1 and 2 (DCPP).
The proposed change would eliminate the surveillance requirement for the emergency diesel generators (EDGs) which required a loss of offsite power (LOOP) restart and load test within 5 minutes of the 24-hour run test conducted every 18 months and replace it with an 18-month hot restart test within 5 minutes of a 2-hour run. This change is in accordance with NUREG-1366, " Improvements to Technical Specifications Surveillance Requirements," dated December 1992.
The safety function of the EDGs is to supply AC electrical power to plant safety systems whenever the preferred AC power supply is unavailable.
Consistent with NUREG-1366, the licensee is requesting a revision to the TS for EDG surveillance testing for DCPP.
2.0 EVALUATION The current Surveillance Requirement 4.8.1.1.2.b.8 requires that within 5 minutes of shutting down the EDG following the once per eighteen month 24-hour endurance test run, a simulated loss of offsite power (LOOP) surveillance test be conducted.
Performing the LOOP test per the present TS requires the ESF loads sequenced during LOOP to be available immediately following the 24-hour endurance run.
This requirement creates scheduling demands by reducing flexibility and imposes unnecessary operational burdens
+
without a corresponding increase in EDG reliability.
The licensee has proposed to limit Surveillance Requirement 4.8.1.1.2.b.8 to the current cycle for both units and replace it with Surveillance Requirement 4.8.1.1.2.e starting with Cycle 8.
This surveillance will eliminate the requirement for the LOOP test following the 24-hour loaded run and will require an EDG hot restart test within 5 minutes following a 2-hour run of the EDG at a load of greater than or equal to 2484 kw.
The revised surveillance requirement will verify EDG hot restart capability by starting the EDG and verifying that it attains rated voltage and frequency within the required time.
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