ML20117A361
| ML20117A361 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 04/29/1985 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20117A338 | List: |
| References | |
| NUDOCS 8505080196 | |
| Download: ML20117A361 (2) | |
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NUCLEAR REGULATORY COMMISSION l
WASHINGTON, D. C. 20555
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SAFETY EVALUATION AMENDMENT NO.
TO NPF-11 AND AMENDMENT N0.
TO NPF LA SALLE COUNTY STATION, UNITS 1 & 2 DOCKET NOS. 50-373 AND 50-374 Introduction By letter dated January 15, 1985, Connonwealth Edison Company (the licensee) proposed amendments requesting changes to the La Salle Units 1 and 2 Technical
-Specifications to change the method for calculating the kilowatt capacity for the electric heaters contained in the Standby Gas Treatment System required by Specification 4.6.5.3.d.3 for surveillance. This surveillance requirement is to ensure that the heaters perfonn their function without major degradation.
The changes are required to account for the bus voltage in the kilowatt capacity calculation and because new heaters have been-installed.
Evaluation Recently, the Standby (Gas Treatment Heaters were replaced with ones having a heat rating of 23 KW at 480 bus voltage) as compared to the previous heaters which had ratings of 20 KW. The present method of testing the performance of the heaters is based on a + or - 2 KW acceptance range without reference to the bus voltage during. testing. The proposed technical specification change would allow an acceptance range of 23 + or - 2 KW'when normalized to 480 volts. Variation in supply voltage from 480 volts is expected; and therefore, heater power con-sumption will be affected by the supply voltage changes. The loading on the diesel generator which power the heaters will not be significantly affected by the nominal 3 KW per heater increase, and the'small increase in heater downstream temperature due to the increased kilowatt will not affect the thermal safety setting of 220*F in the heaters. The change in the method of calculating the heater capacity will provide more accurate test information on the heaters function. Finally, the amendments do not change the intent of the Technical Specification nor pennit testing or operation outside the acceptable criteria.
Based on.the above, the NRC staff concludes that the 15 percent increase in heater power will not cause an unacceptable increase in air temperature i
entering the charcoal filters, and corcurs that the allowable heater capacity l
is voltage dependent. Therefore, the subject change is acceptable.
Environmental Consideration This amendment involves a change in the installation or use of a facility I
component located within the restricted area as defined in 10 CFR Part 20.
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.D 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 issued a proposed finding that this amendment involves no significant hazards consideration and there has been no public comment on such finding. Accordingly, this 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 this amendment.
Conclusion The Commission's proposed determination that the amendment involves no significant hazards consideration was published in the Federal Register (50 FR 12140) on March 27, 1985. No public comments were received.
We have concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the will not be endangered by operation in the proposed manner, and (2) public 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.
Dated:
April 29,1985 i
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