ML19326B951
| ML19326B951 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/06/1978 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19326B940 | List: |
| References | |
| NUDOCS 8004180661 | |
| Download: ML19326B951 (2) | |
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NUCt. EAR REGULATORY COMMisslON f
Y WASHtNGToN. D. C. 20555
%.....,1 SAFETY EVALUATION BY THE OFF7CE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 33 TO FACILITY OPERATING LICENSE NO. DPR-51 i
ARKANSAS POWER AND LIGHT COMPANY ARKANSAS NUCLEAR ONE, UNIT NO. 1 DOCKET NO. 50-313 Introduction By letter dated March 14, 1978, Arkansas Power and Light Company (AP&L or the licensee) requested amendment to Facility Operating License No. DPR-51.
The amendment would modify the Technical Specifications for Arkansas Nuclear One - Unit 1 (ANO-1) to increase the volume requirements and to modify the concentration requirements of the boric acid addition tank.
Background
The current Technical Specifications require at least the equivalent of 47 inches (550 cu. ft.) of 8700 parts per million (ppm) boric acid solution in the boric acid addition tank whenever the reactor primary ccolant temperature is above 200'F.
Recent investigation and analysis revealed that the volume requirement is insufficient to assure a 1". delta k/k shut-down margin for all zero power temperature conditions above cold shutdown at the worst time in core life with a stuck control rod assembly and after xenon decay.
Discussion and Evaluation The proposed change would change im boric acid addition tank volume and concentration requirement to be dependent upon average reactor coolant temperature. The proposed change would 1) increase the required volume of boric acid solution at 8700 ppm when the reactor would be in the hot shutdown condition, and 2) provide sufficient quantity of boric acid to assure a 1". delta k/k shutdown margin at the worst time of core life with a stuck control rod assembly and after xenon decay at all temperatures above cold shutdown. The proposed modification would also provide an alternate or smaller volume versus average reactor coolant temperature requirement of the !)oric acid addition tank with boric acid solution concentration of 12,000 ppm. This ' specification would also assure a 1". shutdown margin above 200 F.
For both proposed requirements the boric acid solution would be required _to be maintained at a temperature at least 10*F above the crystallization temperature. The proposed change in format for the boric acid volume requirements of the baric acid addition tank would reduce the volume requirements over the present requirements when the reactor coolant would be at temperatures less than the temperature of the hot shutdown condition.
This would allow less delay during plant cooldown to make up the boric 8004180[h
2-acid batches to the boric acid addition tank.
It would maintain at least a 1% shutdown margin above 200*F, which is acceptable.
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Based on the above considerations, we fir.d the proposed change would resolve the deficiency in the current Technical Specifications, would not result in a decrease in the safety margin and is acceptable.
Environmental Consideratian 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 551.5(d)(4), that an environmental impact statement, or negative declaration and environmental 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 con-ducted 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.
Dated: July 6, 1978
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