ML20149C510
| ML20149C510 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 01/28/1988 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20149C473 | List: |
| References | |
| NUDOCS 8802090177 | |
| Download: ML20149C510 (3) | |
Text
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO 10 CFR 50.62 (c)(4) EXEMPTION REQUEST AND AMENDMENT NO.143 TO FACILITY LICENSE _NO. DPR-62 CAROLINA POWER & LIGHT COMPANY BRUNSWICK STEAM ELECTRIC PLANT, UNIT 2 DOCKET NO. 50-324
1.0 INTRODUCTION
By letter dated August 17, 1987, (NLS-87-113), Carolina Power and Light Company (CP&L) (the licensee) requested changes to the facility Technical Specifications (TS) with regard to the Standby Liquid Control System (SLCS).
The proposed changes reflect the licensee's plan to increase the minimum required concentration of sodium pentaborate in the SLCS tank to 8
13 weight percent.
This increase in concentration in conjunction with the capability to operate both SLCS pumps simultaneously, at a total two pump combined flow greater than 66 gpm, is proposed to satisfy, in part, the requirements of 10 CFR 50.62.
The deviations from 10 CFR 50.62(c)(4) associated with the TS changes are identified in an exemption request submitted by the licensee in a second letter dated August 17, 1987 (NLS-87-144).
The discuss on of the exemption request is included as part of this Safety Evalua'. ion (SE).
2.0 EVALUATION 2.1 Exemption Request The exemption proposed by the licensee has been reviewed by the staff against the requirements of the Anticipated Transient Wittout Scram (ATWS) rule (10 CFR 50.62) and Generic Letter No. 85-03 "Clarification of Equivalent Control Capacity for Standby Liquid Control Systems,"
dated January 28, 1985.
The licensee's proposed increase in sodium pentaborate concentration to 13 weight percent, in conjunction with a flow rate of 66 gpm and a reactor pressure vessel inside diameter of 218 inches, will provide a boron content equivalent in control capa-city to 86 gpm of 13 weight percent sodium pentaborate for a 251 inch t
inside diameter vessel.
This is in compliance with 10 CFR 50.62 and is, therefore, acceptable. Granting of this exemption provides justifi-cation for certain of the TS changes identified in the amendment request.
- 2. 2 Technical Specification Changes The changed conditions in response to the ATWS rule led to proposed-changes in the TS. These include a surveillance requirement to verify the pump flow rate of 41.2 gpm on a per pump basis in l
8802090177 880128 DR ADOCK 0500026j p
. TC 4.1.5.c.2 and changes to Figure 3.1.5-1 for the SLCS solution concentration versus tank volume curve.
fhe changes are necessary to reflect the new concentration limits whici will ensure that the plant meets the new ATWS requirement.
Figure 3.1.5-1 is revised to indi-cate that the minimum allowable sodium pentaborate concentration is 13 percent by weight.
The licensee's plan to periodically test only one SLCS pump at a time to verify the 41.2 gpm flow requirement instead of both pumps simul-taneously is also acceptable.
This is based on tests performed on the pumps during 1986, which verified that the SLCS is capable of operating under the increased pressure associated with two pump operation.
Furthermore, the test criterion of 41.2 gpm per pump for the positive displacement pumps provides reasonabic assurance that 66 gpm will be achieved during two pump operation. Surveillance Require-ment 4.1.5.c.3 is also changed to identify a new setpoint for opening of the pump relief valve.
This increase from 1400 psig to 1450 psig is a consequence of the higher system pressure associated with two pump operation and is acceptable.
The licensee's proposed TS changes are acceptable as identified in the submittal.
- 3. 0 ENVIRONMENTAL CONSIDERATION This amendment changes a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and a change in surveillance requirements.
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 should be 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 ccmment on such finding. Accordingly, this amendment meets the eligibility critaria 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.
4.0 CONCLUSION
Based on the above evaluation, the Commission's staff finds that the licensee's proposed exemption from 10 CFR 50.62(c)(4) as requested in the submittal dated August 17, 1987 is acceptable.
Thereafter, the licensee shall comply with the provisions of such rule or renew its request for exemption.
The licensee has also proposed TS changes for Brunswick Steam Electric Plant, Unit 2, which would provide for the use of a dual pump operation and an increased boron concentration in the SLCS to meet the requirements of 10 CFR 50.62 paragraph (c)(4).
The approach taken by CP&L and the associated TS changes are acceptable.
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, 4 The Commission made a proposed determiration that this amendment involves no significant ha:aras consideration, which was published in the Federal Reoister (52 FR 47777) on December 16, 1987, and consulted with the Stute of North Carolina. No public comments or requests for hearing were received, and the State of North Carolina did not have any comments.
The staff has concluded, based on the consideration discussed above, that:
(1) there is reasonablo assurance that the health and safety of 1
the public will not be endangered by operation in the proposed manner, and (2) such activities will be conducted in compliance with tha Commission's regulations and the issuance of this anendment will not be inimical to the conmon defense and the security nor to the health and safety of the public.
Principal Contributor:
M. McCoy, SRXB Dated: January 28, 1988 5
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