ML20135F701
| ML20135F701 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 09/10/1985 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20135F691 | List: |
| References | |
| NUDOCS 8509170362 | |
| Download: ML20135F701 (2) | |
Text
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NUCLEAR REGULATORY COMMISSION t
9 E WASHINGTON, D. C. 20555
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 91 TO FACILITY LICENSE NO. DPR-71 CAROLINA POWER & LIGHT COMPANY BRUNSWICK STEAM ELECTRIC PLANT, UNIT 1 DOCKET NO. 50-325
1.0 INTRODUCTION
By letter dated April 30, 1985 (NLS-85-072) the Carolina Power & Light Company (the licensee) requested an amendment to Facilit No. DPR-71 for the Brunswick Steam Electric Plant (BSEP)y Operating License Unit 1.
The amendment changes the Technical Specifications (TS) to revise TS Table 3.6.3-1 to reflect modifications being made during the upcoming refueling outage to provide a dedicated purge system for post-accident combustible gas control.
2.0 EVALUATION The modification perfonn3d on the Brunswick Unit I containment atmospheric dilution (CAD) system will provide a dual dedicated single active failure proof supply of nitrogen for use in post-accident conditions. Currently, nitrogen is transported from the storage tank into the reactor building by a 1-inch line. Once inside the reactor building, the 1-inch line ties into a 20-inch inerting line. Supply of nitrogen through this line into the containment is currently contingent on operation of large air operated isolation valves. The scheduled modification reroutes both the inerting
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and exhaust lines of the CAD system, thereby providing post-accident purging capability independent of these large air operated isolation valves. The 20-inch inerting and exhaust lines will still be used under nonnal startup and makeup conditions. As a result of the modification, the suppression chamber and drywell makeup CAD Inlet valves (CAC-V47) and CAC-V48) are being deleted from TS Table 3.6.3-1.
In addition, seven new primary containment isolation valves are being added to TS Table 3.6.3-1.
The revision reflects a modification to the dedicated purge system for post-accident combustible gas control. The bypassing of the two large air operated valves by two separate one-inch nitrogen lines provides a more reliable source of nitrogen for post-accident conditions. The replacement valves are in redundant pairs in parallel.
The effect of this modification is to provide separate independent systems for containment atmosphere control and further to provide for containment atmosphere dilution post accident through the use of one-inch globe valves which have greater leak tight integrity than the 18-inch butterfly valves in the normal nitrogen inerting and makeup system. The proposed amendment to TS Table 3.6.3-1 is to identify the appropriate isolation valves.
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. The staff has reviewed the licensee's request and finds that the modifications and the proposed chenges to Technical Specification Table 3.6.3-1 are acceptable.
3.0 ENVIRONMENTAL CONSIDERATION
S The amendment involves a change in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20.
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 Comission has previously issued a proposed finding that the amendment involves no significant hazards consideration and there has been no public coment on such finding. Accordingly, the amendment meets the eli for categorical exclusion set forth in 10 CFR 51.22(c)(gibility criteria 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.
4.0 CONCLUSION
I We have 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 Comission's regulations and the issuance of the amendment will not be inimical to the comon defense and security or to the health and safety of the public.
Principal Contributor:
H. Whitener Dated:
September 10, 1985 l
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