ML20151G109
| ML20151G109 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 04/11/1988 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20151G102 | List: |
| References | |
| NUDOCS 8804190223 | |
| Download: ML20151G109 (2) | |
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UNITED STATES
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WASHINGTON, D. C. 20655 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO APENDMENT NO. 20 TO FACILITY OPERATING LICENSE NO. NPF-47 GULF STATES UTILITIES COMPANY RIVER BEND STATION, UNIT 1 DOCKET NO. 50-45,8_
1.0 INTRODUCTION
By letter dated November 13, 1987, GulfStatesUtilitiesCompany(GSU)
(the licensce) requested an amendment to Facility Operating License No.
NPF-47 for the River Bend Station, Unit 1.
The proposed amer.dment would revise section 4.7.1.2 of the Technical Specifications (TSs) to reflect the upgraded ultimate heat sink terperature meritoring systen that was irstalled during the first refueling outage which ended Decer.ber 26, 1987.
The NRC staff apprcved tl.e upgradec temperature r,onitoring syster design by letter dated September 28, 1957, 2.0 EVALUATION i
The purpose of the ultinate heat sink (VHS) is to provide shutdown cooling and decay heat rereval following a design basis accident. The licensee's analysis cf shutdcwn cooling and decay heat removal, as decurented in soc-tion 9.2.5 of the River Bend Station Updated Safety Analysis Report, assumes that the UHS water temperature is no higher than 82*F prior to a postulated design basis event.
TheupgradedUHStemperaturemonitoringsystemconsistsoffcurwidetarge f
(0-100 ) sensors at approxinate elevations of 110 and 65 feet *, and eight-1 narrow range sensors at approximate elevations of 111 feet, 102 feet, 87 feet and 72 feet. The sensers feed a processor which averages the input 1
temperature values, provides local wide and narrow range indicatien, con-trol roem wide and narrow rarge indication and a main control room alarm.
The processor has an installed backup which can be replaced by a standard personal cceputer. The previous design consisted of local sensors at elevation 95 feet.
The current TSs require verification each 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> that the water tempera-ture is less than or equal to 82*F.
Additional provisions require that the temperatures be verified every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> if the previous retding was greater than or equal to 75'F or every 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> when it was greater than or equal to 80'F.
The proposed TSs retain the requirement to verify that the water tenpera-ture is less than or equal to 82'F every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Because of the capabil-1 ity of the enhanced system to provide tenperature readouts in the control 8804190003 000411
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room and also to provide an alarm in the control room, the licensee's pro-posed TS does not require increased surveillence when the UHS water ten-perature exceeds 75'F when the control room alam is operable.
If the control room alarm is inoperable, then the increased surveillance is required when the water temperature exceeds 15' F as in the case of the current TSs. Because of the increased capability of the new :ystem to provide UHS readouts in the control room and an alarm in the control room, the staff finds this change acceptable.
The aroposed TS also clarifies that the average water temperature is an aritimetical average and requires that the average shall include at least 4 operable sensnrs of which at least half shall be located above elevatior.
94 feet. The staff finds that this required distribution of operable sensors will assure a representative measure of the UHS water tempe-ature.
The staff finds that this TS change is acceptable.
The NRC staff concludes that the proposed UHS water temperature surveillance requirements are acceptable.
3.0 ENVIRONMENTAL CONSIDERATION
This amendment involves a change to a requirement with respect to the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and/or changes to the surveillance recuiremen+s. The staff has determined that the arendment 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 signif-icant increase in indivicual or cumulative occupational radiation exposure.
The Cor. mission has previously issued a proposed finding that this amendment involves no significant hazards consideration and there has been no public coment on such finding. Accordingly, this amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.??(c)(9). Pursuant to 10 CFR 51.22 (b), no evironmental impact statement nor environmental assessment need be prepared in connection with the issusnce of this amendment.
4.0 CONCLUSION
This 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 nenner, and (2) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the connon defense and security or to the health and safety of the public.
The staff therefore concludes that the proposed changes are acceptable, and they are hereby incorporated into the River Bend Unit 1 Technical Specifications, j
Principal Contributor: Walter A. Paulson l
Dated: April 11,1988 l
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