ML17055D728
| ML17055D728 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 03/25/1988 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17055D727 | List: |
| References | |
| NUDOCS 8804050296 | |
| Download: ML17055D728 (4) | |
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UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, O. C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR RFACTOR 'REGULATION RELATED TO AMENDMENT NO. 96 TO FACILITY OPERATING LICENSE'NO.
.. NIAGARA MOHAWK'.POWER.CORPORATION NINE. MILE POINT NUCLEAR POWER STATION, UNIT NO;'1 DOCKET NO. 50-220 INTRODUCTION By letter dated January 21, 1988, Niagara Mohawk Power.. Corporation (the licensee) requested an amendment to Facility Operating License No.
DPR-63.for Nine Point Nuclear Power Station, Unit 1.
The amendment would revise
.Technical Specification Table 3.2.7 to delete the Main Steam Warmup Valves.
DISCUSSION AND EVALUATION The Main Steam Warmup Valves were originally designed to equalize'emperature and pressure around the outboard Main Steam Isolation Valves during startup.
After the pressures and temperatures were equal, the outboard Hain Steam Isolation Valves could be opened without causing a pressure transient downstream.
The licensee performs startups with all four Main Steam Isolation Valves.open.
This procedure warms up the steam lines as the reactor heats up. Thus,'he.
warmup valves are not required.
The warmup valves were also designed to equalize pressure arid temperature when bringing the rea'ctor from the hot standby condition (reactor. critical, pressure less than 600 psig and Main Steam Isolation Valves closed> to full power..
At Nine Mile Point Unit 1, this operation is performed by fully opening the outboard air-operated isolation valves and partially opening the inboard electrically-operated isolation valves.
When the pressures and temperatures are equal, the inboard valves are fully opened.
Thus, the warmup valves are-no longer required.
Since the warmup valves are no longer required for operational
- purpose, the 'licensee has physically removed them from the plant.
The removal of the.warmup valves does not affect the operation of any safety system nor the performance of the Main Steam Isolation Valves.
Also, the warmup valves have no role in accident mitigation.
The removal of these valves eliminates two potential containment leakage paths.
We have concluded that this change is acceptable since the warmup valves are not needed for operation of any safety system and are not required to mitigate any accidents.
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~ ENVIRONMENTAL CONSIDERATION This. amendment involves a change in the installation or use of the facility components located within the restricted areas as defined in 10 CFR 20.
The staf+ has determined that this amendment.involves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released oftsite and that there is no significant increase in individual or cumulative occupational radiation exposure..
The Commission has previously issued' proposed finding that this amendment involves no significant hazards consideration and there has been no public comment on such finding.
Accordingly, this amendment meets the'eligibility criteria for categorical exclusion set forth in 10 CFR Sec 51.22(c)(9).
Pursuant to;10:(FR."51.22(b)'no environmental impact statement or environmental asse'ssment need.=be prepared-in
'onnection with the'ssuance of this amendment.
CONCLUSION We have'oncluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed
- manner, and (2) such activities will be 'conducted in compliance with the Commission's regulations-and the issuance of these amendments will not be inimical to the common defense and security or to tIie health and safety of the public.
Dated:
March 25,'988 PRINCIPAL CONTRIBUTOR:
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