ML20118A846
| ML20118A846 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 09/21/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20118A845 | List: |
| References | |
| NUDOCS 9209280279 | |
| Download: ML20118A846 (3) | |
Text
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UNITED STATES n
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i NUCLEAR REGULATORY COMMISSION
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f WAsHINoTON, D c. 20M4 EAfETY EVALVATION BY 1HE OfflCE Of NUCLEAR RQC10R.EEGVLAllGU B[Ml[D 10 AMENOMENLy0,182 10 FACIll1Y OPERATING llCENSE DPR-52 GEORGIA POWER COMPANY. ET AL.
LQWULluHATCH NUCLEAR PLANT. UNil_1 DOCKET NO. 50-321 1.0 IHLPh!XIJOU By letter dated July 17, 1992, as supplemented July 30, 1992, Georgia Power Company, et al. (the licensee), proposed licensa amendments to change the Technical Specifications (TS) for the Edwin 1. Hatch Nuclear Plant Unit 1.
The proposed changes are as follows:
a.
Proposed ChangLl The licensee requested that the allowed outage time (A0T) of 7 days for diesel generator (DG) IB (swing diesel) be extended to 14 days.
This extension would allow the licensee to perform preventative maintenance and modifications for the purpose of increasing its reliability and, in the future, upgrading the DG rated capacity.
This extension will be used only once and only for this
- purpose, b.
Proonsed Chance 2 This proposed change will correct two errors in Hatch Unit 1 DG TSs.
The original markup of '! nit 1 ISs 4.9.B.1 and 4.9.B.2 required performance of
" Surveillance Requirement 4.9.A.2.a.l."
That change was typed and submitted by the licensee as " Surveillance Requirement 4.9.A.2.a" which included all parts of that TS.
This proposed change w ll correct these errors and make both TSs read " Surveillance Requirement 4.9.A.2.a.l."
This proposed change supersedes the same proposed change (i.e., proposed Change 3) of the licensee's submittal dated July 17, 1992, in response to Generic Letter 91-11, " Resolution of Generic Issue 48, *LC0's for Class IE Vital Instrument Buses,' and 49, ' Interlocks and LCO's for Class IE Tie Breakers
- Pursuant to 10 CFR 50.54(t)."
2.0 EVALUATION During the Fall 1992 refueling outage for Plant Hatch Unit 2, the licensee plans to perform preventative maintenance and modifications to emergency diesel generator (DG) IB for the purpose of increasing its reliability and, in 9209200279 920921 DR ADOCK 0500 1
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the future, upgrading its rated capacity. DG IB serves as the " swing" diesel in that it is capable of supplying emergency power to either Unit 1 or 2.
t During the planned work, Hatch Unit 1 is expected to be in power operation.
Pursuant to Unit 1 TS$ 3.5.G and 3.9.B.2, one DG may be inoper 61e for up to 7 days whenever the reactor is in the Start and Hot Standby or Run Mode and the reactor water temperature is greater than 212 degrees F.
The planned work on DG 1B is expected to take approximately 12 days to complete.
Therefore, in order to account for possible contingencies, the licensee is requesting the t
allowable outage time of 7 days be extended to 14 days for performance of this l
maintenance and modification work.
This extension will be used only once and t
only for this purpose.
L 1he licensee stated in its submittal that the Individual Plant Examination analysis performed for Plant Hatch, shows an extremely small probability of occurrence for any accident involving loss-of-offsite-power during the proposed seven day extended A0T for the IB DG, in addition, the reliability of the Hatch DGs has been shown to be very high.
Tne combination of these two factors results in the conclusion that increasing the A0T by seven days for the IB DG as a one time change will not cause a significant increase in the consequences of an accident previously evaluated The NRC staff has reviewed the above change and finds it acceptable.
b.
Proposed Change 2 The purpose of the DGs is to provide AC power to equipment necessary for i
mitigation of accidents involving a loss-of-offsite power (LOSP).
The purpose of TSs 4.9.B.1 and 4.9.B.2 is to ensure availability of sufficient AC power sources whan one of the normal or emergency AC power sources is determined to be inoperable.
This is done by demonstrating operability of the remaining normal and emergency AC power sources at an incressed frequency.
Performance of Surveillance Requirement 4.9.A.2.a.1 adequately demonstrates DG operability.
Therefore, this change will not significantly impact the capability of the DGs to perform their required function of miticating accidents involving a loss-of-offsite power.
The NRC staff has reviewed the above change and finds it acceptable.
3,0 STATE CONSULTATION In accordance with the Commission's regulations, the Georgia State official was notified of the proposed issuance of the amendments.
The State official had no comments.
4.0- ENVIRONMENTAL CONSIDERAT103 The amendments change surveillance requirements.
The NRC staff has determined that the amendments involve no significant -increase :n the amounts, and no significant change in the types, of any effluents that may be released i
offsite, and that ther2 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 (57 FR 37566 dated August 19, 1992).
Accordingly, the amendments meet the eligibility criteria foi 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 CONCLUS!QU lhe 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 l
defense and security or to the health and safety of the public.
Principal Contributor:
K. Jabbour, PDIl-3/NRR Date: September 21, 1992 1
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