ML20078K528
| ML20078K528 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 11/17/1994 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20078K519 | List: |
| References | |
| NUDOCS 9411230116 | |
| Download: ML20078K528 (2) | |
Text
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F ETY EVALVATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT N0. 152 TO FACILITY OPERATING LICENSE NPF-9 AND AMENDMENT N0.134 TO FACILITY OPERATING LICENSE NPF-17 DUKE POWER COMPANY MCGUIRE NUCLEAR STATION. UNITS 1 AND 2 DOCKET NOS. 50-369 AND 50-370 1.0 INTR 00VCTION By letter dated October 4, 1994, Duke Power Company, the licensee for the McGuire Nuclear Station, requested technical specification (TS) changes regarding centrifugal charging pump operation in Modes 4, 5 and 6 (Ref. 1).
TS 3.1.2.3, 3.1.2.4, and 3.5.3 allow only one centrifugal charging (NV) pump to be operable in Modes 4, 5 and 6.
The charging pumps provide, as one of their functions, cooling water to the reactor coolant pump seals. The licensee foresees a potential violation of the above TS in case the operating charging pump needs maintenance or needs to be taken out of service for other reasons while in these modes. To switch charging pumps requires the non-operating pump to be started before shutting the operating pump.
In assence, two pumps are operating at the same time. This overlapping condition lasts for less than or equal to 15 minutes.
During this time, with two pumps operating, a violation of the above TS is created. On the other hand, the plant cannot operate, even for a short time, without an operating centrifugal charging pump, due to the need to maintain pump seal coolant water supply.
The licensee requested removal of this potential cause of a non-compliant condition in the TS.
2.0 EVALUATION The proposed resolution is to allow two centrifugal charging pumps to be in operation at the same time for less than or equal to 15 minutes in Modes 4, 5 and 6.
The limitation of one centrifugal charging pump operating is imposed to avoid cold overpressurization of the reactor cooling system. TS 3.4.9.3 allows one power-operated relief valve (PORV) to be inoperable for 7 days during Modes 4, 5 and 6.
However, during the pump changeovers in these modes, the licensee will maintain two of the three PORVs at McGuire operable. With two pumps operating, adequate depressurization.:apcbility is provided.
The licensee has confirmed that two PORVs are capable of mitigating the effects of mass addition from two centrifugal charging pumps. Also, the probability of a pressurization event during these 15 minutes is judged to be small due to the short time period.
9411230116 941117 fDR ADOCM 05000369 PDR
Considering that the licensee has established the requirement to have two PORVs operable that provide adequate depressurization capability for two centrifugal charging pumps for the relatively short tin.e interval of 15 minutes, we find the proposed technical specification changes acceptable.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the North Carolina State official was notified of the proposed issuance of the amendments.
The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATL0tl The amendments change requirements with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20.
The NRC staff has determined that the amendments involve no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that the amendments involve no significant hazards consideration, and there has been no public comment on such finding (59 FR 52003 dated October 13, 1994).
Accordingly, the amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendments.
5.0 CONCLUSION
The Commission has concluded, 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 manne,', (2) such activities will be conducted in compliance with the Commission's regulations, and, (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor: L. Lois Date:
November 17, 1994
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