ML20210H739
| ML20210H739 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 07/29/1999 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20210H738 | List: |
| References | |
| NUDOCS 9908040086 | |
| Download: ML20210H739 (3) | |
Text
r pO cec
{
[j UNITED STATES pe NUCLEAR REGULA ORY COMMISSION o
' 1" WASHINGTON. D.C. 20$55-0001
$4.....,o SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NOS.136 AND 101 TO FACILITY OPERATING LICENSE NOS. NPF-39 AND NPF-85 PECO ENERGY COMPANY LIMERICK GENERATING STATION. 'JNITS 1 AND 2 DOCKET NOS. 50-352 AND 50-353
1.0 INTRODUCTION
By letter dated January 25,1999, PECO Energy Company (the licensee) submitted a request for changes to the Limerick Generating Station, Units 1 and 2, Technical Specifications (TSs).
The requested changes would revise the TS Surveillance Requirement (SR) frequencies for the emergency diesel generators (EDG) maintenance inspection outages, the 24-hour endurance run, and for ths hot restart from 18 to 24 months. TS 4.8.1.1.2.e.1 currently requires the Limerick EDGs u be inspected in accordance with the manufacturer's recommendations at least once every 18 months. TS 4.8.1.1.2.e.8.a currently requires that every 18 months the EDGs operate under a specified load for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. TS 4.8.1.1.2.e.8.b currently requires that every 18 months each EDG restarts within 5 minutes of shutdown after it has been operated under the specified load for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
2.0 EVALUATION The current Limerick EDG overhaul insioction frequency of 18 months was established in consultation with the EDG manufacturer considering the previous 18-month refueling cycle. TS SR 4.8.1.1.2.e.1 currently requires surveillance, "Every 18 months (by) subjecting the diesel to an inspection in accordance with procedures prepared in conjunction with its manufacturer's recommendations for the class of standby service. TS SR 4.8.1.1.2.e.8.a currently requires surveillance, "Every 18 months (by) verifying the diesel generator operates' for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. During the first 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of this test, the diesel generator shall be loaded to an indicated 2950-3050 kW" and during the remaining 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> of this test, the diesel generator shall be loaded to an indicated 2700-2800 kW"," and TS 4.8.1.1.2.e.8.b currently requires surveillance "Every 18 months [by) verifying that, within 5 minutes of shutting down the diesel generator after the diesel has operated' for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at an indicated 2700-2800 kW", the diesel generator starts'. The generator voltage and frequency shall reach 4280+/- 120 volts and 60 +/- 1.2 Hz within 10 seconds after the start signal." This proposed change will extend the frequencies from 18 months to 24 months for the maintenance inspection outages, the 24-hour endurance test and also for the hot restart test.
i 9900040086 990729 l
PDR ADOCK 05000352 P
PDR l
i l
1
\\
t
, The staff had previously approved the frequency for TS SR 4.8.8.1.1.2.e. Items 2 through 7 and 9 through 13, from18 months to a 2^ month refueling cycle. At that time, the licensee did not propose TS changes for the EDG maintenance inspections, the 24-hour endurance run, and hot restart test because the EDG manufacturer had not yet approved a program for maintenance inspections on a 24-month cycle.
The frequency changes for EDG inspections are based on the implementation of comprehensive new programmatic improvements entitled, " Recommended Maintenance for Opposed Piston Diesel Engines in Nuclear Standby Service," Revison O, dated September 18, 1997. This program was developed by the Fairbanks Morse Owners Group (FMOG) and i
endorsed by Coltec Industries /Fairbanks Morse Engine Division. The licensee performed a 1
detailed comparison of the current Limerick EDG procedures and the FMOG maintenance
{
recommendations. In comparison to the licensee's current procedures, the FMOG program includes certain additional engine internal inspections, improved lube oil sampling and analysis, enhanced operator inspections, and trending of additional engine data. The licensee is implementing these changes in conjunction with the permanent extension of the periodic inspection frequency to 24 months. Limerick Units 1 and 2 currently perform the 24-hour endurance run and the hot restart test in conjunction with the maintenance inspection overhauls. The change to a 24-month interval for these SRs will maintain alignment with the Limerick EDG outage inspection frequency, as well as the current unit operating cycle duration of 24 months.
The staff has evaluated the licensee's submittal and determined that the changes align the frequencies of the EDG outage inspections, the 24-hour endurance run, and the hot restart test to the current plant operating cycle of 24 months. The changes are consistent with the preventive maintenance program developed by the FMOG and approved by the EDG manufacturer.
Based on the above evaluation, the staff concludes the additional engine internalinspections, improved lube oil sampling and analysis, enhanced operator inspections, and trending of additional engine data to further ensure similar EDG reliability and availability provide a basis for an interval increase to 24 months and the change is acceptable.
3.0 STATE CONSULTATION
in accordance with the Commission's regulations, the Pennsylvania State official was notified of the proposed issuance of the amendments. The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
The amendments change the surveillance requirements. The NRC staff has determined that the amendments involve no significant increase in the amounts, and no significant change in
)
l 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 amendments involve no significant hazards consideration,
(
and there has been no public comment on such finding (64 FR 9196). Accordingly, the l
amendments meet 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 assessment need be prepared in connection with the issuance of the amendments.
5.0 CONCLUSION
The Commission 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, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributors: N. K. Trehan B. Buckley Date: July 29,1999 l
l