ML20210P852
| ML20210P852 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 04/23/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20210P858 | List: |
| References | |
| TAC-60700, NUDOCS 8605130527 | |
| Download: ML20210P852 (3) | |
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lf UNITED STATES g
g NUCLEAR REGULATORY COMMISSION a
wAsmNGTON, D. C. 20665
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.11 TO FACILITY OPERATING LICENSE NPF-29 GRAND GULF NUCLEAR STATION, UNIT 1 MISSISSIPPI POWER & LIGHT COMPANY MIDDLE SOUTH ENERGY, INC.
l SOUTH MISSISSIPPI ELECTRIC POWER AMOCIATION
1.0 INTRODUCTION
By' letter dated February 17, 1986, Mississippi Power & Light Company (the licensee) requested a change to the facility Technical Specifications to reduce the heat dissipation requirement for surveillance tests of the standby gas treatment system (SGTS) heaters. To demonstrate operability of the SGTS, the heaters would be required to dissipate 48 5.0 kilowatts instead of the presently required 50 5.0 kilowatts.
2.0 EVALUATION The standby gas treatment system (SGTS) consists of redundant engineered safety feature filtration trains. Each train includes an electric heater to reduce the relative humidity of the incoming, air to less than 70% before filtration under postulated design basis accident conditions in accordance with Regulatory Guide 1.52.*
Surveillance. Requirement 4.6.6.3.d.5 of the Technical Specifications requires that the SGTS heaters be tested pericdically to ensure they can dis-sipate 50 5.0 kilowatts (KW) when tested in accordance with ANSI N-510 (1975).
The licensee states in its February 17, 1986 submittal that the test performed ort the SGTS "B" train heater on February 15, 1986 showed a heat dissipation of less than 45.0 KW (44.926,KW). The licerisee has requested that Surveillance Requirement 4.6.6.3.d.5 be revised to lower the heat. dissibation requirenient to 4Q. 5 0 KW. The reason given by the licensee for the lower heat dissipation is that the presently installed heaters have a riominal rating ~ of 48 KW instead of the 50 KW heaters which were installed when the Technical Specifications were
.iss'ed with the operating license. The licensee has calculated that a' minimum.
u of.about' 21.5 KW is ade.quate.to ensure 70% relative humidity in the air leavinf the heaters.
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The NRC staff has reviewed the licensee's submittal and made an independent cal-culation of the heat dissipation required to meet guidelines.in.Regulatoiy Guide 1.52.
The staff's independent calculation confirms the licensee's calculated value of~21.5 KW assuming inlet air temperature of 140*F and relative humidity
- RegulatoryGuide1.52,"DesignTestingandMainhenanceCriteriaforPost Accident Engineered Safety Feature Atmosphere C'leanup System ' Air Filtration and Adsorption Units of Light Water Cooled Nuclear Power Plants", USNRC B605130527 860424 DR
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. of 100%, and assuming the SGTS design air flow rate of 4000 cubic feet per minute.
The staff concludes that the requested change will not significantly alter the air quality leaving the heaters and the change meets the guidelines of Regulatory Guide 1.52. Therefore, the staff finds the licensee's proposed change to be acceptable.
3.0 ENVIRONMENTAL CONSIDERATION
The amendment involves a change of requirements of facility components located within the restricted area as defined in 10 CFR 20. The Commission made a proposed determination that the amendment involves no significant hazards consideration, and ther:: have been no comments on that proposal. Based on its evaluation, the staff concludes that there is no significant change in types or significant increase in the amounts of any effluents that may be released offsite. There is no significant increase in individual or cumulative occupational radiation exposure because the changes do not affect personnel exposure. Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR Section 51.22(c)(9). Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assess-ment need be prepared in connection with the issuance of the amendment.
4.0 CONCLUSION
The Commission made a proposed determination that the amendment involves no significant hazards consideration which was published in the Federal Register e
(51 FR 8054) on March 7,1986, and consulted with the state of Mississippi.
No public comments were received, and the state of Mississippi did not have any comments.
We have concluded, based on the qonsiderations. 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 issuance of this amendment will not be inimical to the com;non defense and security or to the health and safety of the public.
Principal Contributors:
J. Lee, Plant Systems Branch, DBL L. Kintner, BWR Project Directorate No. 4, DBL Dated:
Apr.11 23,1986
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