ML20055F331
| ML20055F331 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/03/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20055F329 | List: |
| References | |
| NUDOCS 9007160290 | |
| Download: ML20055F331 (2) | |
Text
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.105TO FACILITY OPERATING LICENSE NO. NPF.6 ENTERGY OPERATIONS. INC..
ARKANSAS NUCLEAR ONE. UNIT NO. 2 DOCKET NO. 50-368 INTRODUCTION By letter dated March 2,1990, Arkansas Power and Light Company requested amendmenttotheTechnicalSpecifications(TSs)appendedtoFacilityOperating License No. NPF-6 for Arkansas Nuclear One, Unit 2 (ANO-2). Specifically, Technical Specification 3.10.2 Special Test Exception would be modified to refer to the use of either the Core Operating Limit Supervisory System (COLSS) ortheCoreProtectionCalculators(CPC)tomonitorlinearheatrateduring
. physics tests.
ThiswouldpermitControlElementAssemblies-(CEAs)tobe positioned outside of their normal group heights and insertion limits.
In addition, Surveillance Requirement 4.10.2.2 would be modified to delete the language specifically requiring use of the incore detectors to monitor linear
- heat rate.
' EVALUATION During physics testing above 5% rated thermal power, Special Test Exception
'3.10.2. requires that linear heat rate be determined to be within the limits of Linear Heat Rate Technical Specification 3.2.1 by monitoring it continuously with the incore-detector monitoring. system. The language requiring use of the
-incore detectors implies use of COLSS to monitor linear heat rate. However, Technical Specification 3.2.1 is not applicable below 20% rated' thermal power and COLSS is.not considered operable below 20% rated thermal power.
Therefore,thespecificrequirementforuseofincoredetectors(COLSS)isnot appropriate in Surveillance Requirement 4.10.k.2.
The proposed change would allow use of thp CPC system for monitoring linear heat rate. The CPCs use a minimum core average power of 20% rated thermal power to calculate heat flux.
Since this results in conservative values of linear heat rate being calculated below 20% rated thermal power, the staff concludes that use of the CPCs for monitoring linear heat rate is appropriate to meet the intended requirement of 4.10.2.2 below 20f rated thermal power. Also, the proposed language for Technical Specification 3.10.2 allowing the linear heat rate to be determined by either continuously monitoring with COLSS or, when COLSS is out-of-service, by monitoring at least every two hours with the CPCs is similar to that of the existing Linear Heat Rate Technical Specification 3.2.1.
Therefore, the use of the CPCs for monitoring linear heat rate during Special Test Exception 3.10.2 is also acceptable when COLSS is out-of-service.
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-ENVIRONMENTAL CONSIDERATION The amendment involves a change in a requirement with respect to the installe-tion or use of a f acility component located within the restricted area as defined in 10 CFR Part 20 and changes 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 radiation exposures. The Commission has previously issued a proposed finding that the amendment involves no significant hazards consideration and there has been no public comment on such finding. Accordingly, o-the amendment meets the eligibility criteria for categorical exclusion set forthin10CFRSection51.22(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 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 the amendment will not be inimical to the common defense and security or to the health and safety of the'public.
Date: July 2, 1990 Principal Contributors:
L. Kopp, SRXB L. Tran, PDIV-1
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