ML20137M719

License Change Application 128 for Amend to License NPF-1, Changing Tech Specs to Revise Operability Requirements for Outside Power Distribution Sys

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: ML20137M699 ML20137M719 ML20137M727
References
TAC-60018, NUDOCS 8509130311
Download: ML20137M719 (3)

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1 PORTLAND GENERAL ELECTRIC COMPANY EUGENE WATER & ELECTRIC BOARD AND PACIFIC POWER & LIGHT COMPANY 4

I l l 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 i By u

Bart D. Withers Vice President Nuclear i l Subscribed and sworn to before tre this 10th day of September 1985.

Notary Public of Orpion

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My Commission Expires: 4/d ~

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! 0509130311 050910 l PDR ADOCK 05000344 i p PDR w

! LCA 128 i Page l'of 2 DESCRIPTION OF CHANGE.

4 i This change revises Trojan Technical Specification (TTS) 3.8.2 regarding 4 operability requirements for onsite AC and DC electrical power distribu-

_ tion systems. See Attachment 1 for specific changes.

j- 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 per the NRC-approved M-STS (NUREG-0452, Revision 4).

l-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

] 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.

)- 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.

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!- 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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