ML20207T104

Safety Evaluation Supporting Amend 103 to License DPR-40

ML20207T104
Person / Time
Site:	Fort Calhoun
Issue date:	03/09/1987
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20207T092	List: ML20207T091 ML20207T098 ML20207T104
References
TAC-64371, NUDOCS 8703230195
Download: ML20207T104 (2)

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• UNITED STATES 8 o NUCLEAR REGULATORY COMMISSION r, e WASMNGTON. D. C. 20656

%,. . . . . ,o SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 103 TO FACILITY OPERATING LICENSE NO. OPR-40 OMAHA PUBLIC POWER DISTRICT FORT CALHOUN STATION, UNIT NO. 1 DOCKET NO. 50-285 INTRODUCTION By letter dated January 8,1987, Omaha Public Power District (OPPD), the licensee, proposed an amendment to Sections 2 and 4 of the Technical Specifications for Fort Calhoun Station, Unit No. 1. The proposed amendment would increase the refueling boron concentration to at least 1800 ppm from the current value of 1700 ppe.

EVALUATION The refueling boron concentration requirements are provided to ensure both a shutdown margin of not less than 5% delta k/k for a freshly loaded core with all control element assemblies (CEAs) withdrawn, and a dilution time to critical greater than or equal to 30 minutes. The current Technical Specification refueling boron concentration of 1700 ppm does not meet these requirements for Cycle 11 operation of Fort Calhoun Station, Unit No.1.

Therefore, the licensee has revised the refueling boron concentration to 1800 ppm and has shown that this results in an actual shutdown margin of 5.2%

delta k/k and a time interval of 31.9 minutes to lose the prescribed shutdown margin in the event of aa inadvertent boron dilution in the refueling mode.

The minimum refueling shutdown margin, therefore, is maintained above the minimum required margin and the dilution time to critical is in excess of the minimum acceptance criterion for operator response. In addition, the licensee's calculations for these analyses were performed with approved methodology. Therefore, the staff finds the proposed increase in refueling boron concentration to 1800 ppe acceptable for Cycle 11 operation.

Based on the above evaluation, the staff finds the proposed increase in ,

refueling boron concentration to 1800 ppm for Cycle 11 of Fort Calhoun Station, Unit I acceptable.

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n ENVIRONMENTAL CONSIDERATION This amendment involves a change in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and a change to the 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 radiation exposure. The Commission has previously published a proposed finding 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 assessment need be prepared in connection with the issuance of the amendment.

CONCLUSION We have concluded, based on the considerations discussed above, that (1) thore 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 the amendment will not be inimical to the common defense and security or to the health and safety of the public.

Date: March 9, 1987 Principal Contributor:

Laurence I, Kopp l

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