ML20211G227
| ML20211G227 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 09/23/1997 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20211G224 | List: |
| References | |
| NUDOCS 9710020153 | |
| Download: ML20211G227 (3) | |
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UNITED STATES E
NUCLEAR REGUtATORY COMMISSION i
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WASHINGTON, D.C. 2056H001 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION ELATED TO AMENDMENT NOS. 91 AND 78 TO FACILITY OPERATING LICENSE NOS. NPF-76 AND NPF-80 HOUSTON LIGHTING & POWER COMPANY CITY PUBLIC SERVICE BOARD OF SAN ANTONIO CENTRAL POWER AND LIGHT COMPANY CITY OF AUSTIN. TEXAS DOCKET NOS. 50-498 AND 50-499 SOUTH TEXAS PROJECT. UNITS 1 AND 2 1.0 lEB0D0CT10N By application dated July 8, 1996, Houston Lighting & Power Company, et.al.,
(the licensee) requested changes to the Technical Specifications (TSs)
(Appendix A to Facility Operating License Nos. NPF-76 and kPF-80) for the South Texas Project, Units 1 and 2 (STP).
The proposed changes would allow that the component cooling water (CCW) system surge tank level instrumentation can be demonstrated operable, by performing a channel calibration test, during any plant mode of operation.
2.0 EVALUATION The design for STP provides three independent component CCW loops for each unit.
In each unit, one CCW loop can provide required cooling in any mode of operation including accident conditions.
The existing TS 4.7.3 specifies surveillances to be performed periodically to demonstrate that all three CCW loops are operable.
TS 4,7.3.b currently specifies three CCW instrumentation surveillances which must be performed at least once per 18 months, during shutdown. The proposed change does not affect the first two of these surveillances, i.e., TS 4.7.3.b.1 and TS 4.7.3.b.2.
These continue to be required at least once per 18 months, during shutdown.
The third of these 18-month surveillances, TS 4.7.3.b.3, currently requires that the CCW surge tank level be demonstrated operable by performance of a channel calibration test on each of the three CCW loops at least once per 18 months, also during shutdown. The licensee states that the channel calibrations required in TS 4.7.3.b.3 can be safely performed during any plant operating mode since three-train redundancy ensures that sufficient cooling 9710020153 970923 PDR ADOCK 05000498 P
. capacity i., available for continued operation of safety-related equipment during normal and accident conditions.
Therefore, the licensee proposes to change TS 4.7.3.b.3 to delete the existing restriction that requires the CCW surge tank level instrumentation channel calibration to be performed during shutdown, while continuing to require the same maximum interval, i.e., 18 months.
The channel calibration will be performed only on the level instrumentation of a CCW train that is out of service for scheduled mairitenance.
Redundancy will be provided by instrumentation associated with the two trains that are in service during the channel calibration.
Surveillances will continue to be performed at the intervals (18 months) specified in the existing TS.
The surveillances do not differ from those previously performed to comply with the TS. The licensee states that the proposed change to TS 4.7.3.b.3 will not affect any accident initiators or precursors and will not alter the design i
assumptions for the systems or components used to mitigate the consequences of an accident.
3.0
SUMMARY
The staff has reviewed the licensee's submittal and finds that the proposed CCW surge tank level instrumentation TS change will not alter the TS surveillances to be performed nor cause the surveillance to be performed under conditions which will have a significant impact upon the margin of safety because of the redundancy in the CCW system. The staff, therefore, finds that the proposed TS change is acceptable.
4.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Texas State officir.1 was notified of the proposed issuance of the amendments.
The State official had no comments.
5.0 ENVIRONMENTAL CONSIDERATION
The amendments change 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 change surveillance requirements. The NRC staff has determined that the amendments involve 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 the amendments involve no significant hazards consideration, and there has been no public comment on such finding (61 FR 44358). Accordingly, the 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 the amendments.
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6.0 CONCLUSION
The Commission 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 manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
K. Mortensen Date:
September 23, 1997 i
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