ML20211B321
| ML20211B321 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 02/10/1987 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20211B304 | List: |
| References | |
| TAC-55852, NUDOCS 8702190382 | |
| Download: ML20211B321 (3) | |
Text
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UNITED STATES g
g NUCLEAR REGULATORY _ COMMISSION _
t 9j WASHINGTON, D. C. 20555
/
SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDPENT NO. 97 TO FACILITY OPERATING LICENSE NO. NPF-3 TOLECO EDISON COMPANY AND THE CLEVELAND ELECTRIC ILLUMINATING COMPANY DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 DOCKET NO. 50-346
1.0 INTRODUCTION AND BACKGROUND
By letter dated May 28, 1985, the Toledo Edison Company, licensee for Davis-Besse Nuclear Power Station, Unit No.1, submitted an application for amendment to Facility Operating License No. NPF-3. Changes were proposed to the Davis-Besse Unit 1 Technical Specifications (TSs),
Appendix A, which involve Sections 3.8.1.1 and 4.8.1.1.2.
The amendment request is partially based on NRC recommendations in Generic Letter 84-15 on prevention of premature diesel engine degradation. The proposed changes concern reducing the number of cold fast starts for emergency diesel generators (EDGs) and surveillance testing of diesel generator synchronization with offsite power source.
2.0 EVALUATION The safety function of TS 3.8.1.1 (Action:
a, b and c) is to ensure that the plant has reliable A.C. electrical power during all modes of station operation and shutdown conditions. The amendment proposes three revisions to this TS:
(1) Action Statement 3.8.1.1.a addresses the increased surveillance testing requirements during the inoperability of either diesel generator or offsite A.C. source. When one diesel generator is inoperable, the remaining diesel generator is required to be tested per Surveillance Requirement 4.8.1.1.2.a.4 within one hour and at least once per eight hours thereafter. The proposed revision to this Action Statement concerns the demonstration of diesel oenerator operability per 4.8.1.1.2.a.4 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and deletion of the requirement to test per 4.8.1.1.2.a.4 once every eight hours thereafter.
(2) Action Statement 3.8.1.1.b addresses the increased surveillance testing requirements during the inoperability of one offsite A.C.
source and one diesel generator. When one diesel generator and an offsite power source are inoperable, the remaining diesel generator EDO 50 6
P
. is required to be tested per Surveillance Requirement 4.8.1.1.a.4 within one hour and at least once per eight hours thereafter. The proposed revision to this Action Statement concerns the demonstration of diesel generator operability per 4.8.1~.1.a.4 within eight hours and the deletion of the reouirement to test per 4.8.1.1.2.a.4 once every eight hours thereafter.
(3) Action Statement 3.8.1.1.c requires that when two offsite A.C.
circuits are inoperable, Surveillance Reauirement 4.8.1.1.2.a.4 is to be performed to demonstrate the operability of two diesel generators within one hour and at least every eight hours thereafter. The proposed revision to this Action Statement concerns the demonstration of diesel generator operability per 4.8.1.1.2.a.4 within eight hours.
We find the changes to Action Statements 3.8.1.1.a b and c to be consistent with the intent of Generic Letter 84-15 to improve and maintain diesel generator reliability by reducing excessive diesel generator testing. We, therefore, find the changes acceptable.
The safety function of Surveillance Reauirement 4.8.1.1.2 is to ensure the operability of the EDG to provide power for essential loads in the event of loss of power. Surveillance Requirement 4.8.1.1.2.a.4 presently recuires that each EDG be demonstrated as operable at least once per 31 days from ambient (cold fast start) condition. The frequency of cold fast start tests has been found to result in premature EDG engine wear thereby reducing the reliability and availability of the EDG. The proposed Surveillance Requirement of 4.8.1.1.2.c is a new addition which would require starting each diesel generator at least once per 184 days from ambient condition and accelerating to at least 900 rpm in 10 seconds. A proposed addition to Surveillance Requirement 4.8.1.1.2.a would require that if surveillance requirements of 4.8.1.1.F.a (proposed addition, 184 day tests) had been performed within the previous 31 days, then the monthly testing would not be performed.
In addition, a Surveillance Requirement 4.8.1.1.2.a.4 revision would i
l require all other EDG starts for testing to be preceded by an engine l
prelube period and/or other appropriate warmup procedures.
l l
We consider these proposed revisions to Surveillance Requirement 4.8.1.1.2 l
adeouate to ensure diesel generator operability while reducing the detrimental effects of frequent cold test starts on diesel generator reliability and availability. We find these proposed changes to be consistent with the recommendations of Generic Letter 84-15 and, l
therefore, find them acceptable.
Surveillance Requirement 4.8.1.1.F.a.5 requires verification of i
synchronization of the diesel generator to offsite power and loading to l
at least 1000 kw, and operation for at least 60 minutes. The licensee l
proposed a revision to 4.8.1.1.2.a.5 requiring only verification that I
l
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'- the generator can be synchronized to offsite power. We find that this type of testing would not fulfill the objective of the testing, i.e.,
demonstration of the capability of the diesel to assume its designed load.
Furthermore, we note that the proposed testing is not in conformance with Regulatory Guide 1.108 and the Standard Babcock & Wilcox TSs. Therefore, this TS change is not acceptable.
3.0
SUMMARY
We have reviewed the above changes and, with the exception of the revision to Surveillance Requirement 4.8.1.1.2.a.5, find that they are consistent with the recommendations of Generic Letter 84-15 and are acceptable.
4.0 ENVIRONFENTAL CONSIDERATIONS This amendment involves changes in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and changes in surveillance requirements. We have 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 1 proposed finding that this amendment involves no significant hazards consideration, and there has been no public comment on such finding. Accordingly, the amendment 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 assessmant need be prepared in connection with the issuance of this amendeent.
5.0 CONCLUSION
We have concluded, based on the considerations above, that (1)'there is reasonable assurance that the health and safety of the public will not be erdangered 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.
Dated: February 10, 1987 Principal Contributors:
- 0. Chopra L. Kelly
.