ML19260B260
| ML19260B260 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 11/23/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19260B259 | List: |
| References | |
| NUDOCS 7912070485 | |
| Download: ML19260B260 (2) | |
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UNITED STATES
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_a SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REA TCR REGULATION SUPp0RTING AMENDMENT NO. 38 TO FACILITY OPERATING LICENSE NO. DPR-35 BOSTON EDISON COMPANY PILGRIM NUCLEAR POWER STATION, UNIT NO. 1 DOCKET NO. 50-293 Introduction By application dated January 16, 1976, Boston Edison Company (BECo or licensee) proposed an amendment to the Technical Specification Limiting Conditions for Operation and Surveillance Requirements for Containment Cooling System (Suppression Pool Cooling Sabsystem) pumps. This change would relax pump operability requirements in certain systems where soa-e auaos are installed in excess of system reauirements.
Discussion Each of two independent Containment Cooling System lcops recuires one Residual Heat Removal (RHR) pump, two Reactor Building Closed Cooling Water (RBCCW) pumps, and two Salt Service Water (SSW) pumps to be coerable. There are two RHR pumps available per loop, three RBCCW oumps available Der loop, and two SSW pumps available per loop, with an installed common spare. All four RHR pumps are required for the Low Pressure Coolant Injection (LPCI) mode of operation of the RHR System, and thus no excess capacity exists (assuming a single failure).
However, there is installed excess capacity in the RBCCW and SSW subsystems.
The licensee's proposal would eliminate unnecessary coerability and surveillance requirements for the installed spars pumps.
Evaluation The original Bases for 3.5.B, Containment Cooline Susbsystem, recognized the installed spare pumps provided margin in excess of tr.e cesign requirements.
It was felt necessary to avoid the less of margin by including the spare oumos in the TS LC0/ Surveillance requirements.
While tqis approach was clearly conservative, it is acceptable for safety to insure tne redundant cooling caoacity of these systems, assuming a single failure.
Sufficient redundancy exists with the spare Dumos inoperable to allaw operation witnout reauiring shutdown and maintenance on the spare pumps.
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. We have reviewed the proposad technical specifications against the current GE Standard Technical Specifications (NUREG-0123 Revision 2 dated August 1979).
We find that the licensee's prcposal equals or exceeds the GE STS in degree of conservatism.
Certain editorial changes were made in the licensee's submittal for the sake of clarity and consistency.
These changes were discussed with and agreed to by the BECo licensing staff.
Environmental Consideration We have determined that the amendment does not authorize a change in effluent types or total amounts nor an increase in power level and will not result in a'ny significant environmental impact.
Having made this determination, we have further concluded that the amendment involves an action which is insignificant from the standpoint of environmental impact and prsuant to 10 CFR Section 51.5(d)(4) that an environmental impact statement, negative declaration, or environmental impact appraisal will not be prepared in connection with the issuance of the amendment.
Conclusion We have concluded, based on the considerations discussed above, that:
(1) because the amendment does not involve a significant increase in the probability or consequences of accidents previously cor.sidered and does not involve a significant decrease in a safety margin, the amendment does not invoive a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be be endangered by operation in the proposed manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.
Dated:
November 23, 1979 1
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