ML18029A888
| ML18029A888 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 09/19/1985 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML18029A887 | List: |
| References | |
| NUDOCS 8509300451 | |
| Download: ML18029A888 (3) | |
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+y**W UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO.
122 TO FACILITY OPERATING LICENSE NO.
DPR-33 AMENDMENT NO.
117 TO FACILITY OPERATING LICENSE NO.
DPR-52 AMENDMENT NO.
93 TO FACILITY OPERATING LICENSE NO. DPR-68 TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT UNITS I, 2 AND 3 DOCKET NOS. 50-259 50-260 AND 50-296
1.0 INTRODUCTION
By letter dated June 26, 1985 (TS 210) the Tennessee Valley Authority (the licensee or TVA) requested amendments to Facility Operating License Nos.
DPR-33, DPR-52 and DPR-68 for the Browns Ferry Nuclear Plant, Units I, 2 and 3.
The amendments would revise the Appendix A Technical Specifications to permit maintenance on automatic isolation valves in the secondary containment ventilation system during periods when secondary containment integrity is required.
2.0 DISCUSSION AND EVALUATION Each secondary containment ventilation system penetration contains two automatic isolation valves in a series configuration.
Under the terms of the definition of Secondary Containment Integrity, (Technical Specification Section 1.0.P), for secondary containment integrity to exist, each valve must be either (1) operable, or (2) deactivated in the closed position.
These restrictions do not permit valve maintenance when secondary containment integrity is required.
The amendment would revise Section 1.0.P such that secondary containment integrity also exists as long as either one of the two valves in each penetration is deactivated in the closed position.
Deactivation of a single valve in the isolated position is sufficient to ensure that the secondary containment function can be fulfilled and will permit maintenance on the other valve.
With one valve in a closed deactivated condition, no single active or passive failure can result in loss of the isolation function for that penetration and containment isolation is not dependent upon any automatic or manual action.
As a result, an equal or greater margin of safety is maintained.
The proposed amendment is therefore acceptable.
3.0 ENVIRONMENTAL CONSIDERATION
S The amendments involve 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 amendments involve no significant increase PDR ADOCK 050002gR59 P
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.
Accordingly, the amendments meet the eligibilitycriteria for cateqorical 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.
- 4. 0 CONCLUSION 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 Commission s regulations, and the issuance of these amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
L. Ruth Dated:
September 19, 1985