ML20137G570
| ML20137G570 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 01/07/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20137G547 | List: |
| References | |
| TAC-59760, NUDOCS 8601210088 | |
| Download: ML20137G570 (2) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION o
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 5 TO FACILITY OPERATING LICENSE NO. DPR-80 AND AMENDMENT NO.
3 TO FACILITY OPERATING LICENSE NO. DPR-82 PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-275 AND 50-323 Introduction The Pacific Gas and Electric Company (PG&E) submitted by letter DCL-85-309, dated September 20, 1985 license amendment request LAR-85-10 requesting an amendment to the Diablo Canyon Nuclear Power Plant, Unit 1 and Unit 2, combined Technical Specifications regarding the first iristal inservice inspection of snubbers. The current specifications require this inspection to be performed after four months but within ten months of comencing power operation.
(Power operation is defined in the Technical Specifications as greater than 5 percent of rated thermal power.) This coincides with the initiation of the power ascension test program. The proposed amendment would change Technical Specifications 4.7.7.Ib to permit PG8E to perform the inspection at the completion of the power ascension test program. This change will affect only Diablo Canyon Unit 2 because the first inservice visual inspection for Unit I has already been completed. However, an amendment to the license for each unit is necessary because the combined Technical Specifications apply to both units.
Evaluation The purpose of the first visual inservice inspection of safety related snubbers is to identify snubber damage or unsatisfactory snubber perfomance caused by the snubber installation process or by the thermal shakedowns experienced during the initial operation of the plant. A reasonable time interval after criticality is imposed on this inspection to assure (1) that all snubbers have been exposed to an adequate number of thermal shakedowns and (2) that temperature stabilization of the snubbers has been achieved.
The low power testing at below 5 percent of rated thermal power as normally conducted by licensees accomplishes most of the thermal shakedowns. The temperature stabilization of the snubbers nomally takes place during the subsequent power ascension program. The Diablo Canyon Unit 2 went critical and comenced the low power testing program on August 20, 1985.
It was completed in early October 1985. The power ascension program (i.e., power operation above 5 percent) commenced on October 14, 1985 and is expected to be completed in late 1985.
86012100(9 960107 PDR ADOCK 05000275 P
. The staff has reviewed the licensee's amendment reauest.
Based on its review and the above information regarding the low power test proaram and the status of the power ascension test program, the staff concludes that the first visual inservice inspection of safety related snubbers at the completion of the power ascension test program will provide meaningful results reoarding the installation and coeration of the snubbers. The scheduled outacs at the completion of the power ascension test program will permit any modifications to be made as necessary.
Environmental Consideration These amendments involve a change in the installation or use of the facilities components located within the restricted areas as defined in 10 CFR 20 and changes to the surveillance requirements. The staff has determined that these amendments involve no sianificant 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 these amendments involve no significant hazards consideration and there has been no public coment on such finding. Accordingly, these amendments meet the eligibility criteria for categorical ext.lusion 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 these amendments.
Conclusion The staff 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 endanoered by operation in the proposed manner, and (2) such activities will be conducted in compliance with the Comission'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.
Dated: January 7, 1986 Principal Contributors:
H. Shaw
.