ML20052F742
| ML20052F742 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 05/06/1982 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20052F739 | List: |
| References | |
| NUDOCS 8205130550 | |
| Download: ML20052F742 (2) | |
Text
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 72 TO FACILITY OPERATING LICENSE NO. NPF-1 PORTLAND GENERAL ELECTRIC COMPANY THE CITY OF EUGENE, OREGON PACIFIC POWER AND LIGHT COMPANY TROJAN NUCLEAR PLANT DOCKET N0. 50-344 Introduction By letter dated April 12, 1982, Portland General Electric Coapany, et al.,
(the licensee or PGE) requested an amendment to Facility Operating License No. NPF-1 for operation of the Trojan Nuclear Plant in Columbia County, Oregon.
The licensee seeks to amend the technical specifications to allow the use of incore cuarter-core flux maps for periodic calibration of the excore axial flux offset detection system. At present, the technical specifi-cations require that the excore axial flux offset detection system, which is used to detect core axial power imbalance or tilts, be calibrated by the use of full incore flux maps.
Evaluation The use of quarter-core flux maps for excore detector calibration has been previously reviewed and approved by NRC. The NRC-approved Westinghouse docu-ment "Excore Detector Recalibration Using Quarter-Core Flux Maps" (WCAP-8648-A, February,1979) documents both the method and NRC's acceptance. The method is wholly applicable to the Trojan Nuclear Plant.
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Since the validity of this method requires that reasonable core radial symmetry exist, we have added a condition that the quarter-core calibra-
T tion method'be appTied only when the quadrant power tilt ratio (a measu're of radial power symmetry) is less than or equal to 1.02.
If this ratio exceeds this value, a full-core flux map would be required for excore axial offset calibration. The licensee has agreed to this condition.
Based on the above, we find the licensee's proposed change acceptable.
8205130550 820506 PDR ADOCK 05000344 P
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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 any 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, pursuant to 10 CFR 51.5(d)(4), that an environmental impact statement or negative declaration and environ-me'ntal impact appraisal need not be prepared in connection with the issuance of this 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 considered and does not involve a significant decrease in a safety margin, the amendment does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not 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 this amendment will not be inimical to the common defense and security or to the health and safety of the public.
9 Date: May 6, 1982 Principal Contributors:
C. M. Trammell i
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