ML20137M719
| ML20137M719 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 09/10/1985 |
| From: | Withers B PORTLAND GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20137M704 | List: |
| References | |
| TAC-60018, NUDOCS 8509130311 | |
| Download: ML20137M719 (3) | |
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PORTLAND GENERAL ELECTRIC COMPANY EUGENE WATER & ELECTRIC BOARD AND PACIFIC POWER & LIGHT COMPANY 4
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Operating License NPF-1 Docket 50-344 License Change Application 128 This License Change Application requests modifications to Operating License NPF-1 for the Trojan Nuclear Plant to revise the operability requirements for the onsite power distribution system.
PORTLAND GENERAL ELECTRIC COMPANY By u
i Bart D. Withers Vice President Nuclear i
Subscribed and sworn to before tre this 10th day of September 1985.
Notary Public of Orpion
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My Commission Expires:
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0509130311 050910 PDR ADOCK 05000344 i
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LCA 128 i
Page l'of 2 DESCRIPTION OF CHANGE.
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This change revises Trojan Technical Specification (TTS) 3.8.2 regarding operability requirements for onsite AC and DC electrical power distribu-4 tion systems. See Attachment 1 for specific changes.
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REASON FOR CHANGE i
Page 3/4 8-6. TTS 3.8.2.1. AC Distribution - Ooeratina i '
i The requirement for AC electrical buses to be energized by sources other l
than the emergency diesel generators (EDGs) is revised to allow the AC distribution system to be powered from either offsite sources pr_ the EDG l-per the NRC-approved M-STS (NUREG-0452, Revision 4).
I Paae 3/4 8-7. TTS 3.8.2.2. AC Distribution - Shutdown 1-A similar change as that made to TTS 3.8.2.1-above is made to TTS 3.8.2.2.
l Also, the term " Vital" buses is changed to " Preferred Instrument" buses j
to reflect the correct name of the system as described in the Trojan i
Updated FSAR (Section 8.3.1.1.5.2).
Lastly, the ACTION statement is
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revised to conform with the NRC-approved M-STS (NUREG-0452 Revision 4).
I Page 3/4 8-10. TTS 3.8.2.4. DC Distribution - Shutdown i
The ACTION statement is revised to conform with the NRC-approved M-STS (NUREG-0452, Revision 4).
I Page B 3/4 8-1. Bases 3/4.8. Electrical' Power Systems The Bases is expanded to address the above change.
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SIGNIFICANT HAZARDS CONSIDERATION DETERMINATIM i
The changes to the ACTION statements of TTS 3.8.2.2 and 3.8.2.4 do not j
increase the probability or consequences of an accident, do not create a l
new or different kind of accident, nor do they involve a reduction in a j
margin of safety since this change constitutes an additional restriction not presently in the TTS. The proposed change requires an inunediate 1
suspension of activities that could directly lead to a release of radio-activity as opposed to the present TTS which requires the indirect method
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of controlling a radioactive release through establishing CONTAINNENT j
INTEGRITY within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.' Based on the above, and since this change i
conforms with the W-STS, no significant hazard is created.
i The' change to TTS 3.8.2.1 and 3.8.2.2 concerning the powering of the AC i
distribution system does not increase the probability or consequences of-I an accident, does not. create a new or different kind of accident,' nor does it involve a reduction in a margin of safety since the sources of l
power for the AC distribution system are already governed by TTS 3.8.1.1 l
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O LCA 128 Page 2 of 2 and 3.8.1.2, "AC Sources". Based on the'above, and since this change conforms with the W-STS, no significant hazard is created.
SAFETY / ENVIRONMENTAL EVALUATION Safety and environmental evaluations were performed as required by 10 CFR 50 and the Trojan Technical Specifications. This review deter-mined that an unreviewed safety question does not exist since Plant i
operations remain consistent with the Updated FSAR, adequate surveillance is maintained, and there is no conceivable impact upon the environment.
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