ML20085M710
| ML20085M710 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/21/1991 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20085M708 | List: |
| References | |
| NUDOCS 9111120120 | |
| Download: ML20085M710 (3) | |
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UNITED STATES
!s(*Ci i i NUCLEAR REGULATORY COMMISSION 5'g ((
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WASHING 10N. D C. 2M55
%....s SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION l
RELATED TO AMENDMENT NO.163 TO FACILITY OPERATING LICENSE NO. NPF-3 l
TOLEDO EDISON COMPANY CENTERIOR SERVICE COMPANY l
AND THE CLEVELAND El' JTRIC ILLUMINATING COMPANY DAVIS-BESSE _ NUCLEAR POWER STATION, UNIT NO.1 DOCKET NO. 50-346
1.0 INTRODUCTION
By letter dated March 16, 1991, theToledoEdisonCompany(thelicensee) requested changes to Technical Specifications (TS) 3.0.3 and 3.0.5, Limiting Conditions for Operation (LCO), for the Davis-Besse Nuclear Power Station, Unit No.1.
The proposed changes affect TS 3.0.3 and TS 3.0.5 by revising the allowable time interval for achieving Hot Standby. The change to TS 3.0.3 would increase the time interval allowed for reaching Hot I
Standby from 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> once TS 3.0.3 has been entered. A similar I
change has been proposed for TS 3.0.5 to increase the time interval from 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> allowed for reaching Hot Standby once TS 3.0.5 has been l
entered. Corresponding changes have been proposed to Dases Section 3.0.3.
l 2.0 EVALUATION l
TS 3.0.3 provides 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to prepare for an orderly shutdown before initiating t
a change to plant operation. One hour allows the operators to coordinate the reduction in electrical gemration with the load dispatcher to ensure the stability of the electrical grid.
The time limits specified to reach lower modes of operation allow the shutdown to proceed in an orderly manner that is within the specified maximum cooling rate and cooldown capabilities of the plant assuming only the minimum required equipment is operable.
I When entering into existing TS 3.0.3, unless associated action requirements l
are met within I hour, action must be taken to place the plant in an operational mode in which the applicable LC0 does not apply, by' placing it l
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9111120120 911021 DR ADOCK 0500 6
-2 in at least Hot Standby within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The 6-hour interval starts immediately when TS 3.0.3 is entered. The proposed change to TS 3.0.3 to require reaching Hot Standby with the "next" 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> would, in ef fect, increase the time interval to 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />.
The existing TS 3.0.5 requires that within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of d system, subsystem, train, component or device being declared inoperable solely because its normal power source and emergency power source are inoperable, or its normal or emergency power source is inoperable and its redundant system, subsystem, train, component or device is inoperable, actions must be initiated to achieve Hot Standby within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> interval starts immediately when TS 3.0.5 is entered.
The proposed change revising the allowable time interval to be within the "next" 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> effectively increases the interval by 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
The effect of the proposed change to TS 3.0.3 and its Bases is to increase the maximum time interval from 6 to 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> allowed for reaching Hot Standby once the TS has been entered. The licensee has determined that this change is consistent with the guidance of Babcock and Wilcox (B&W) Standard TSs for Pressurized Water Reactors, NUREG-0103, Rev. 4, and the model TSs included in Generic Letter 87-09, which also allow for a maximum of 7 nours.
The basis for the 7-hour time interval is to allow for an orderly shutdown and not challenge the safety systems.
The effect of the proposed change to TS 3.0.5 is to increase the time interval from 6 to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> allowed for reaching Hot Standby once TS 3.0.5 has been entered. This change :s aso consistent with the guidance of B&W Standard TSs which allow for a maximum of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
The licensee has stated that there will be no hardware, systems or components affected by the proposed TS changes. Since the proposed changes are within the bounds judged to be reasonably acceptable for nuclear power plants, there are no factors which should require the licensee to take exception.
The staff has reviewed the proposed changes to TS 3.0.3, TS 3.0.5, and Bases Section 3.0.3 and find them tu be acceptable.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Ohio State official was notified of the proposed issuance of the amendment. The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
This amendment changes a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 or changes a surveillance requirement. 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 individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding
. that the amendment involves no significant hazards consideration and there has bean no public comnent on such fir. ding (56 FP 37591).
Accordingly, the anendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9). Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessnent need be prepared in connection with the issuance of the anendment.
5.0 CONCLUSION
f The staff has concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safet not be endangered by operation in the proposed manner, (2) y of the public will such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of this amendaent will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor: James Lombardo Date: October 21, 1991 i
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