ML20195B215
| ML20195B215 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 06/10/1988 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20195B205 | List: |
| References | |
| NUDOCS 8806210337 | |
| Download: ML20195B215 (2) | |
Text
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NUCLEAR REGULATORY COMMISSION j
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT N0.
5 TO FACILITY OPERATING LICENSE NPF-68 GEORGIA POWER COMPANY, ET AL DOCKET N0. 50-424 V0GTLE ELECTRIC GENERATING PLANT, UNIT 1
1.0 INTRODUCTION
By letter dated February 4,1988, Georgia Power Company, et al., (the licensee) requested a change to the Technical Specifications for Vogtle Electric Generating Plant, (VEGP), Unit 1.
The proposed change would change the Technical Specification surveillance flow rate for each motor-driven auxiliary feedwater pump from 175 gpm to 150 gpm.
2.0 EVALUATION Technical Specification 4.7.1.2, "Auxiliary Feedwater System," required verification at least once every 31 days that each motor-driven auxiliary feedwater (AFW) pump develops a discharge pressure of greater than or equal to 1605 psig at a flow of greater than or equal to 175 gpm.
A minimum flow of 175 gpm was recommended by the pump manufacturer for protection of the motor-driven AFW pumps. Surveillance tests have demonstrated adequate discharge pressure, but the 'A' motor-ariven AFW pump meets the 175 gpm flow rate by a narrow margin.
The licensee states that the surveillance test results have been relatively constant and have not exhibited any downward trend. The licensee believes that the marginal surveillance results are due to the uncertainties in the orifice and recirculation pipe design. The licensee requested the manufacturer evaluate the acceptability of a lower flow rate.
The manufacturer informed the licensee that 150 gpm is an acceptable minimum flow rate for extended operation of the motor-driven AFW pumps. The licensee states that the pump head is relatively constant in the 150-175 gpm flow region; therefore, 1605 psig is still the appropriate discharge oressure. The licensee then concludes that 1605 psig at 150 gpm is an appropriate Technical Specification surveillance acceptance criterion for the motor-driven AFW pumps because it is adequate for pump protection and it verifies that a pump is operating on its head versus flow curve. The licensee also concludes that the requested acceptance criterion provides an equivalent indication of pump operability compared with the criterion of 1605 psig at 175 gpm.
The NRC staff has reviewed the above information and finds that 1605 psig at 150 gpm is acceptable for pump protection because the manufacturer has stated that extended operation of the pumps can occur with a minimum flow rate of 150 gpm. The NRC stoff also finds that 1605 psig at 150 gpm will allow the I
licensee to verify pump operability because it will not affect the licensee's comparison of observed pump head and flow rate versus the established operable pump curve of head versr flow. Therefore, the NRC staff concludes that the requested change is acc. gable.
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3.0 ENVIRONMENTAL CONSIDERATION
This amendment involves change in surveillance requirements.
The staff has determined that the amendment involves 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 exposure. The NRC staff has made a determination that the amendment involves no significant hazards consideration, and there has been no public comment on such finding. Accordingly, the amendment meets 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 assessn. ant need be prepared in connection with the issuance of the amendment.
4.0 CONCLUSION
The Commission made a proposed determination that the amendment involves no significant hazards consideration which was published in the Federal Register on March 23,1988, (53 FR 9506), and consulted with the state of Georgia. No public comnents were received, and the state of Georgia did not have any comments.
The staff has ccncluded, based on the considerations discussed above, that: (1) there is reasonable assurance that the health and safet endangered by operation in the proposed manner, and (2)y of the public will not be such activities will be conducted in compliance with the Commission's regulations, and the issuance of this amendment will not be inimical to the conson defense and security or to the health and saTety of the public.
Principal Contributor: Jon B. Hopkins, PDII-3/0RP-I/II Dated:
June 10, 1988 1
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