ML20199A912
| ML20199A912 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 06/06/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20199A909 | List: |
| References | |
| NUDOCS 8606160251 | |
| Download: ML20199A912 (2) | |
Text
.o SAFETY EVAI.UATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 3 TO FACILITY OPERATING LICENSE N0. NPF-37 COMMONWEALTH EDISON COMPANY BYRON STATION, UNIT NO. 1 DOCKET NO. STN 50-454
1.0 INTRODUCTION
By application dated March 11, 1986, as supplemented by letter dated April 11, 1986, Commonwealth Edison Company (the licensee) requested an amendment to the Technical Specifications for Byron Station, Units 1 and 2.
The proposed Technical Specification change replaces the minimum differential pressure for the Residual Heat Removal (RPR) pumps with the RHR pump Minimum Acceptable performance curve.
2.0 DISCUSSION AND EVALUATION Technical Specification 4.5.2f requires the performance of each Residual Heat Removal (RHR) pump to be periodically tested by verifying that the pump develops a specified differential pressure on recirculation flow.
The specified differential pressure corresponds to a flow rate of 500 gpm on the minimum acceptance performance curve.
When operating an RPR pump on recirculation flow during this surveillance, the licensee stated that flow rates in excess of 650 gpm hav,e been observed.
These higher flow rates correspond to a lower differential pressure.
The proposed change, which would allow use of the minimum acceptable performance curve instead of a point :a the curve, provides more flexibility in demonstrating the required performance of the RHR pumps.
The staff has evaluated the impact of the proposed amendment on the accident analysis in the Byron FSAR and on the functionality of the RPR system.
The pump performance requirements are consistent with the FSAR safety analyses.
RPR pump performance in the acceptable region, as defined by the pump performance curve proposed by the licensee, is sufficient to assure adequate reactor coolant flow through the RPR heat exchangers to meet the plant cooldown requirements.
The proposed revision to the Byron Station Technical Specifications forwarded by the licensee's letter dated March 11, 1986, as supplemented by letter dated April 11, 1986, are considered acceptable.
3.0 ENVIRONMENTAI. CONSIDERATION This amendment replaces the minimum differential pressure for the RPR pumps with the RPR pump Minimum Acceptable Performance Curve.
The staff has determined that the amendment involves no increase in the amounts, and no change in the types, of any effluents that may be released offsite 8606160251 860606 DR ADOCK 0500 4
-2 and that there is no increase in individual or cumulative occupational radiation exposure.
The Commission has previously issued a proposed finding that this amendment involaes no significant hazards consideration and there has been no public comment on such finding. Accordingly, this amendment meets the elioibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Parsuant to 10 CFR 51.22(b) no env.ironmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendment.
4.0 CONCLUSION
The staff 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 manner, and (2) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to, the health and safety of the public.
5.0 ACKNOWLEDGEMENT R. Karsch and L. Olshan prepared this Safety Evaluation.
Dated:
JUN 0 61986
.