ML20125D354
| ML20125D354 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 06/07/1985 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20125D349 | List: |
| References | |
| NUDOCS 8506120328 | |
| Download: ML20125D354 (3) | |
Text
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UNITED STATES 9
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDPENT N0.86 TO PROVISIONAL OPERATING LICENSE NO. DPR-16 GPU NUCLEAR CORPORATION AND JERSEY CENTRAL POWER & LIGHT COMPANY OYSTER CREEK NUCLEAR GENERATING STATION DOCKET N0. 50-219
1.0 INTRODUCTION
By letter dated July 19, 1984, and supplemented by the agreement noted in meeting minutes dated February 22, 1985, GPU Nuclear Lthe licensee) requested an amendnent to Provisional Operating License No. DPR-16 for the Oyster Creek Nuclear Generating Station (0CNGS). This amendment would authorize changes to the Appendix A Technical Specifications (TS), Section 3.5 and 4.5, Containment, which (1) decrease the maximum oxygen concentration allowed in the primary containment atmosphere within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the reactor mode selector switch is placed in the run mode from less than 5% to less than 4% and (2) correct a typographical spelling error in the Bases.
A Notice of Consideration of Issuance of Amendment to License and Proposed No Significant Hazards Consideration Determination and Opportunity for Hearing related to the requested action was published in the Federal Register on March 27, 1985, (50 FR 12145). No public coments or requests for hearing were received.
2.0 DISCUS $10N AND EVALUATION TS 3.5.A.6 currently requires that the primary containment atmosphere oxygen concentration shall be less than 5% within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the reactor mode selector switch is placed in the run mode. The licerisee's proposed change to the TS would require the primary contsinment oxygen concentration to be reduced to less than 4% within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the switch is placed in the run mode. The oxygen concen-tration is reduced with nitrogen gas.
When the primary containment atmosphere oxygen concentration is reduced below the TS limit, the primary containment is in the inerted condition.
Inerting is required to reduce the oxygen concentration to a level such that a flamable mixture would not be produced in the primary containment following onset of a Loss-of-Coolant Accident (LOCA).
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Regulatory Guide 1.7 defines the Ifmiting oxygen concentration, if more than 4 volume percent hydrogen is present, to be 5 volume percent.
In our evaluation of the General Electric report, NED0-22155, the staff concluded that the "recombiner capability" called for in 10 CFR 50.44 was not needed in plants with Mark I containments if certain criteria were met.
Among these subsidiary criteria was a requirement that a 4% value be used for the limiting oxygen concentration when the inerted condition was i
required.
The Itcensee has also proposed changes to the Bases of Section 3.5 of the TS. These changes are to add text to the Bases to explain that the pro-posed 4% oxygen limit was established by analysis of the generation and mitigation of combustible gas mixtures in inerted BWR Mark I containments in General Electric document NED0-22155 dated June 1982 and to reference this document. This document has been evaluated by the staff and the staff considers the text being proposed by the licensee to be correct.
The licensee's proposed change to state in the Bases for Section 3.5 o
limit" is not being that "The 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> time.... establish the required 0,icensee aareed tn have made. This was withdrawn by the licensee when the l the maximum oxygen concentration in the primary containment less than 4%
within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the reactor mode selector switch is placed in the run mode. This was agreed to in the meeting minutes dated February 22, 1985.
l The licensee also proposed to correct a typographical spelling error in l
the Bases for Section 4.5. Containment, of the TS. This would be to spell " concentration" on TS page 4.5-10 correctly.
Therefore, based on the above, the staff concludes that decreasing the maximum oxygen concentration in the primary containment during the run mode from less than 5% to less than 4%, adding text to the Section 3.5 Bases and correcting the spelling of concentration" in the Section 4.5 Bases is acceptable.
3.0 ENVIRONMINTAL QUALIFICATION This amendment involves a change to a reouirement with respect to 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 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 is no significant increase in indi-vidual or cumulative occupational radiation exposure. The Comission has previously issued a proposed finding that this amendment involves no significant hazards consideration and there has been no public l
coment on such finding. Accordingly, this amendment meets the eligi-bility criteria for categorical exclusion set forth in 10 CFR l
51.22Cc)(9). Pursuant to 10 CFR 51.22(b) no environmental impact statement or environment assessment need be prepared in connection with the issuance of this amendment.
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4.0 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 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 this amendment will not be inimical to the common defense and security or to the health and safety of the public.
5.0 ACKNOWLEDGEMENT This evaluation was prepared by F. Eltawila and J. Donohew.
Dated: June 7, 1985.
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