ML19353A095
| ML19353A095 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 12/10/1980 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19353A093 | List: |
| References | |
| NUDOCS 8101070138 | |
| Download: ML19353A095 (2) | |
Text
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UNITED STATES y
c(3 3 NUCLEAR REGULATORY COMMISSION
.,g Q Rg WASHINGTON, D. C. 20555 s.; w /
SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 22 TO FACILITY OPERATING LICENSE NO. NPF 4 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION, UNIT NO. 1 DOCKET NO. 50-333_
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Introduction:==
By letter dated November 10, 1980, the Virginia Electric and Power Company (the licensee) requested a change in the Technical Specifications to Operating License No. NPF-4 for the North Anna Power Station, Unit No.1 (NA-1).
Tne 3
limits with respec proposed change would reduce the axially dependent Fxy i
to current limits up to 65 percent of core height for the remainder of Cycle 2 operation and the forthcoming Cycle 3 operation.
Above 65 percent of core height the proposed F limit is greater than the currently specified limit.
As part of xy the methodology associated with power distribution surveillance requirements, the F changes produce a reduction in the axial power d.stribution turn on power kevel to 92 percent and adjustments in the axial flux difference limits x
at part power (50 to 82 percent).
Evaluation:
The licensee has provided an aalysis of the total peaking factor as a function limits.
of core height for Cycle 2 and Cycle 3 operation using the proposed Fxy The peaking f actors produced by this analysis are then used to generate tne proposed revisions to the axial power distribution surveillance turn on power and part power axial flux difference limits in the Technical Specifications.
The licencee's analysis was performed using standard ;rethodology documented I
in a letter dated July 16, 1975 from the Westinghouse Electric Corporation (WEC) to the Nuclear Regulatory Commission (NRC). NRC approval for using this I
methodology in the control of the total peaking factor was granted to WEC in a letter dated April 15, 1976. Such analyses have been approved and used for previous cycles at NA-1 and at most other Westinghouse initial and reload cycles s.ince the method was first approved by the NRC.
Our independent calculations produce the same adjustments to the axial power distribution surveillance turn on power and part power axial flux difference limits proposed by the licensee. These changes will ensure that the total p1010"
. peaking factor as a function of core height limits currently specified will continue to be met with no reduction in operating margin limits for the remainder of Cycle 2 and the forthcoming Cycle 3 operations. Based on the above, we find that the proposed changes in the NA-1 Technical Specifications will not adversely impact the safe operation of NA-1 during the remainder of 4
Cycle 2 and the forthcoming Cycle 3 operations and therefore, we find these changes to be acceptable.
Environmental Consideration We have determined that the amendaent 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 cetermination, 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 statecent or negative declaration and environ-mental impact appraisal need not be prepared in connection with the issuance of this amendment.
Conclusion We have concluded, based on th a t ansiderations discussed above, that:
(1) because the amencaent de < n;t 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 nealth and safety of the public will not be endangered by operation in the proposed manner, and (3) such activities will be conducted in cocoliance with the Cocmission'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.
Date: December 10, 1980
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