ML19332B248
| ML19332B248 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/08/1980 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19332B247 | List: |
| References | |
| NUDOCS 8009260358 | |
| Download: ML19332B248 (2) | |
Text
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1 NUCLEAR REGULATORY COMMISSION g
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a SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULAT SUPPORTING AMENDMENT N0. 31 TO FACILITY OPERATING LICENSE N THE TOLED0 EDIS0N COMPANY AND_
THE CLEVELAND ELECTRIC ILLUMINATING COMPANY DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 DOCKET NO. 50-346 Introduction In a letter dated August 22,19B0, the Toledo Edison Company (TECo) requested an amendment to Facility Operating License No. NPF-3 for the Davis-Besse Nuclear Power Station, Unit No.1, which would modify Limiting Conditions for Operation (LC0's) for the Containment Purge and Exhaust Isolation Valves. The amendment would allow the plant, which is in cold shutdown, to heatup and operate at power with these valves inoperable.
In telephone conversations with the TECo staff, we have deter-mined that the operators for two valves (both outside containment) are currently inoperable, and new equipment cannot be procured in time for the projected start-up of the plant.
Discussion and Evaluation The purpose of the Containment Purge System is to [.rovide a source of clean fresh air to the containment whenever personr:1 access is desired. The Containment Purge and Exhaust Isolation Valves are utilized to assure that any radioactive material in the containment atmosphere is prevented from reaching the environment.
The Technical Specifications (TSs) impose certain operating restrictions on the TS Section 3.6.1.7 requires that these valves purge and exhaust isolation valtves.
be shut when the plant is in Modes 1 through 4, although the applicable Action statement allows the valves to be open in these modes provided the accumulated open time is less than 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> for the previous 365 days. TS Section 3.6.3.1 and its associated Table 3.6-2 require all containment isolation valves to be operable with The Action statement for this sectiop requires minimum specified closing times.
that, with any isolation valve inoperable, one of four actions must be accomplished:
"a.
Restore the inoperable valve (s) to OPERABLE status within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; or Isolate each affected penetration within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> by use of at least b.
one deactivated automatic valve secured in the isolation position; or Isolate each affected penetration within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> by use of at least c.
one closed manual valve or blind flange; or d.
Be in at least H01 STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />."
B0092605
Davis-Besse 1 With action b or c taken while in Mode 1, 2, 3 or 4, unlimited continued opera-tion in'that mode is allowable. However, TS Section 3.0.4 applies in this case, which prohibits entry into a higher mode of operation unles's the LC0 can be met without reliance on the provisions contained in the Action statement.
In ite August 22, 1980, submittal, TECo requested that the provisions of TS Section 3.0.4 be made not applicable to the operability of the purge and exhaust isolation valves. This would permit the olant to commence heatup and proceed to Mode 1 (the plant is currently in Mode 5) with ir. operable valves so long as the purge penetrations have been rendered passive by completing Action statement b or c of TS Section 3.6.3.1.
TECo states that the release of radioactive material to the environment with the valves in this ccndition will be consistent with the assumptions used in Loss of Coolant Accident (LOCA) analyses, and that the imposi-tion of TS Section 3.0.4 for these valves may be eliminated.
Having reviewed the licensee's submittal, re consider that as long as the Action statement part b or c of TS Section 3.6.3.1 is taken with respect to the purge and exhaust valves, the valves are in the safe position for LOCAs or any other event which would release radioactivity to the containment.
Operation in any mode as well as entry into any mode need not be precluded by inoperability of the valves so long as the Action statement is fulfilled. We find TECo's proposal to be acceptable.
Environmental Consideration We have determined that the amendment does nat authorize a change in effluent types'or total amounts nor an increase in power level and will not result in any significant environmental impact. Having made this determination, we have further concluded that the amendment involves an action which is insignificant from the standpoint of environmental impact and, pursuant to 10 CFR 851.5(d)(4), that an environmental impact statement, or negative declaration and environ-mental impact appraisal need not be prepared in connection with the issuance of this amendment.
Conclusion We have concluded, based on the considerations discussed above, that:
(1) because the amendment does not involve a significant increase in the probability or consequences of accidents previously considered and does not involve a significant decrease in a safety margin, the amendment does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and (3) such activities will be conducted in compliance vith the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
Dated: Se,ntember 8, 1980 y
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