ML20135H885
| ML20135H885 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 09/16/1985 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20135H882 | List: |
| References | |
| NUDOCS 8509240349 | |
| Download: ML20135H885 (3) | |
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og UNITED STATES
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g NUCLEAR REGULATORY COMMISSION L
8 WASHINGTON, D. C. 20555
\\ **"*J SAFETY EVALUATION REPORT i
RELATED TO AMENDMENT NO. 45 TO FACILITY OPERATING LICENSE NPF-9 AND TO AMENDMENT NO. 26 TO FACILITY OPERATING LICENSE NPF-17 DUKE F0WER COMPANY i
INTRODUCTION By letter dated May 7,1985, Duke Power Company proposed changes to the Tech-nical Specifications for McGuire Nuclear Station. Units 1 and 2, with respect I
to ice condenser doors. The proposed changes are in response to an incident at Catawba Unit 1 in which 23 of the 24 pairs of ice condenser inlet doors were found to be blocked closed after 10 days of operation. The event revealed certain deficiencies in the Catawba Unit 1 Technical Specifications which are also present in the Technical Specifications for McGuire Nuclear Station, Units 1 and 2.
EVALUATION The proposed changes to the Technical Specificattuns impose additional limitations for operation and additional surveillance requirements not presently in Specift-cation 3/4.6.5.3 in order to eliminate a concern that ice condenser doors which are required to be closed, but capable of opening during power operation, could be blocked in a closed position for an inordinate amount of time.
If an ice con-denser door is not capable of opening automatically, then the safety function of the Ice Condenser System (to provide pressure suppression capability to limit i
the containment peak pressure transient during t.0CA conditions) is degraded because the flowpath of the t.0CA mass and energy discharge through the ice con-i 1
denser bays for heat removal is impeded.
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The licensee's proposed amendments eliminate this concern by revising Technical Specification 3/4.6.5.3, " Ice Condenser Doors" and its associated bases to limit
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the allowed time of power operation with the ice condenser inlet doors in a closed and inoperable condition, and by clarifying the definition of " inoperable" to mean "not capable of opening automatically." The limit is implemented by adding to the action statement for Specification 3.6.5.3 a requirement that with one or more ice condenser doors inoperable (not capable of opening automatically),
all doors shall be restored to operable status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or the facility shall be in hot standby within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in hot shutdown within the following 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 />. The concern is I
further eliminated by changing surveillance Specification 4.6.5.3.1.b.(2) to require that the periodic surveillance verify that each ice condenser door is capable of opening automatically in that it is not impaired by ice, frost, debris or other obstruction (words underlined are added). The associated Bases 3/4.6.5.3 are also clartffed consistent with these changes.
The change in the definition of " operable" and the change in the bases are a more appropriate representation and are, therefore, acceptable.
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" The change to the surveillance specification will assure that man-made obstruc-tions which could impair the doors from opening automatically, such as the blocking devices found to be left in place at Cata6a Unit 1, are periodically verified not to be present.
Such periodic verification, in conjunction with i
administrative procedures employed by the licensee (e.
verification procedure for each door blocking device) g., a tag-out and return provides reasonable assurance that obstructions such as temporary blocking devices used during plant shutdown will not impair the ice condenser safety function. This, change is, therefore, acceptable.
The staff finds that the limit of one hour for continued power operation which is allowed by the revised specification to restore all doors to operable status, including the specified periods to be in hot standby, hot shutdown and cold shutdown, is appropriate considering the safety significance of such operation and is sufficiently brief such that the probability of a LOCA occurring during this interval is so small as to be negligible. Accordingly, no undue risk is associated with such limited operation and the specification, as revised, is acceptable.
ENVIRONMENTAL CONSIDERATION The amendments involve a change in use of facility components located within the restricted area as defined in 10 CFR Part 20 and changes in surveillance requirements. The staff has determined that the amendments involve no signiff-cant 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 exposure.
The Comission has previously issued a proposed finding that these amendments involve no significant hazards consideration, and there have been no public comments on such finding.
Accordingly, the amendments meet the eligibility) criteria for categorical exclusion set forth in 10 CFR Section 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.
CONCLUSION The Comission made a proposed determination that the amenenents involve no significant hazards consideration which was published in the Federal Register (50FR32794)onAugust 14, 1985, and consulted with the state of North Carolina.
No public coments were received, and the state of North Carolina did not have any coments.
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 Comission's regulations, and the issuance of these amendments will not be inimical to the comon defense and security or to the health and safety of the public.
Principal Contributors: Darl S. Hood, l.icensing Branch No. 4. OL J. Pulsipher, Containment Systems Branch, DSI Dated: September 16, 1985 i
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September 16, 1985 AMENDMENT NO. 45 TO FACIt.ITY OPERATING t.ICENSE NPF McGUIRE NUC'. EAR STATION, UNIT 1 AMENDMENT NO. 26 TO FACil.ITY OPERATING LICENSE NPF McGUIRE NUCLEAR STATION, UNIT 2 l
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f DISTRIBUTION:
-0IketNos. 50-369/370 NRC PDR t.ocal PDR NSIC PRC System 1.B #4 r/f l
E. Adensam D. Hood M. Duncan Attorney, OEl.0 R. Diggs, ADM T. Barnhart (8)
E. t.. Jordan, DEQA:IAE L. J. Harmon, I&E File B. Grimes J. Partlow M. Virgilio J. Pulsipher I
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