ML20083F209
| ML20083F209 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 09/24/1991 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20083F204 | List: |
| References | |
| NUDOCS 9110040135 | |
| Download: ML20083F209 (3) | |
Text
a at 8e fg UNITED STATES g
NUCLEAR REGULATORY COMMISSION D
-l WASHINGTON, O. C 20565
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 59 TO FACILITY OPERATING LICENSE N0. NPF-62 ILLIN0IS POWER COMPANY, ET AL.
CLINTON POWER STATION, UNIT NO. 1 DOCKET NO. 50 #61
1.0 INTRODUCTION
By letter dated October 30, 1987, Illinois Power Conpany, et al. (the licensee) requested 24 changes to the Clinton Power Station Technical Speci-fications. Package nunber 12 proposed that a footnote allowing engine prelube and/or warm-up prior to diesel generator starting be nade applicable to nost of the required load tests required by Technical Specification (TS) 4.8.1.1.2.a.5.
Following discussions with the NRC Project Manaaer, the licensee subelitted a revision to this proposed arnendrnent by letter dated June 30, 1987. This revision proposed that all test starts required by TS 4.8.1.1.2 rnay be preceded by engine prelube and/or warnup except for ambient starts required every 184 days. The revision was within the scope of the original ansendnent request, as noticed in the Federal Register.
2.0 EVALUATION NRC Generic Letter (GL) 84-15, " Proposed Staff Actions to Iraprove and Maintain Diesel Generator Reliability," describes nethods for Energency Diesel Generator (EDG) testing which, if inplenented, would nininize the inpact of testing on EDG reliability. These nethods include engine prelube, nodified or slow starts as applicable, and loading in accordance with vendor reconnendations. Prior to licensing, a footnote was added to Section 4.8.1.1.2 of the Clinton TS for the specific purpose of allowing this nethodology to be applied to certain EDG surveillance testing. However, this footnote was not nade applicable for all required surveillances and subsequently the NRC deternined that the wording of the footnote was anbiguous, and that clarification was appropriate.
The licensee provided a proposed anendnent to clarify the specification and broaden the applicability of the footnote by letter dated October 30, 1987 which they anended by letter dated June 30, 1989. The proposed anendnent deletes the existing footnote and adds two new footnotes. The first new footnote states that all planned diesel generator starts for the purpose of necting the surveillance requirenents (TS 4.8.1.1.2) nay be preceded by an engine prelube period as recorrnended by the nanuf acturer.
For the purposes of this review, the staff interprets "prelube" to nean the <1eliberate act of pressurizing the entire diesel engine lubricating systen for a specified period of tine to 9110040133 910924 PDR ADOCK 05000461 P
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~2-ensure adequate lubrication to all moving parts prior to activating any engine starting mechanism.
The diesel engines at Clinton are normally continuously maintained in this conditions using a separate, motor driven pupp. The second new footnote covers when fast' starts and loading from ambient conditions ere dnd are not required as part of the surveillance requirements. The staff has reviewed the licensee's submittal and has concluded that the proposes TS changes, with the new footnotes, accurately reflect the staff's current position regarding EDG testing methodology as documented in GL 84-15. Therefore, the proposed TS.
changes are acceptable.
During a phone conversation on September 11, 1991, the licensee indicated that the proposed double asterisk footnote on TS page 3/4 8-4 is applicable to both TS Surveillance Requirement 4.8.1.1.2 a.4 and a.5.
The licensee's submittal dated June 30, 1989 failed to include the double asterisk and footnote for TS Surveillance Requirement 4.8.1.1.2 a.5 (SR a.5).
It is readily apparent that this footnote does indeed apply to TS SR a.5 since the footnote itself addresses the 90-second loading time of the diesel generator. The footnote indicates that surveillance testing to verify the diesel generator start and load times (less-than or equal to 12 seconds and less than or equal-to 90 seconds, respectively)'from ambient conditions shall be-performed at least once per 184 days.
All other engine starts may be conducted in accordance with the manufacturer recomendations. The prop:.;ed changes-described above do not affect the staff's initial pro of no significant hazards, is acceptable to the staff, and therefore, posal has been incorporated into the TS.
The Bases of the affected specification sections have been modified by the licensee to provide the basis for change in the EDG starting requirements.
Based on its review, the staff concludes that the changes to these bases are acceptable.
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3.0 STATE CONSULTATION
In accordance with the Comission's regulations, the appropriate Illinois State official was notified of the proposed issuance:of the amendment. The-state official had no consents.
- 4.0 ENVIROPMENTAL CONSIDERATION pursuant to 10 CFR 51.21, 51.32, and 51.35, an environmental assessment and finding-of no significant impact has been prepared and published in the Federal Register on February 4, 1991 (56 FR 4309). Accordingly, based upon the environmental assessment, the Comission has determined that the issuance of this amendment will not have a significant effect on the quality of the human envirornent.
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5.0 CONCLUSION
The staff has concluded, based on the considerations discussed above, that:
1 (1) there is reasonable assurance that the health and safety of the will not be endangered by operation in the proposed manner; and (2) public such activities will be conducted in compliance with the Comission's regulations and the issuance of this amendment will not be inimical to the comon defense and security or to the health and safety of the public.
Principal Contributor: John B. Hickman, NRR Dated: September 24, 1991
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