ML20134P905

Application for Amend to License NPF-1,consisting of License Change Application 127 to Amplify Surveillance Requirements for Component Cooling Water Sys Valves

ML20134P905
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	09/03/1985
From:	Withers B PORTLAND GENERAL ELECTRIC CO.
To:
Shared Package
ML20134P902	List: ML20134P899 ML20134P905 ML20134P914
References
TAC-60017, NUDOCS 8509090092
Download: ML20134P905 (3)

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PORTLAND GENERAL ELECTRIC COMPANY l EUGENE WATER & ELECTRIC BOARD 1 AND PACIFIC POWER & LICHT COMPANY Operating License NPF-1 Docket 50-344 License Change Application 127 This License Change Application requests modifications to Operating License NPF-1 for the Trojan Nuclear Plant to amplify the surveillance requirements for Component Cooling Water System valves.

PORTLAND GENERAL ELECTRIC COMPANY By Bart D. Withers Vice President Nuclear Subscribed and sworn to before me this 3rd day of September 1985.

Notary Public of Ort (fon OMyCommission

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LCA 127 Page 1 of 2 LICENSE CHANGE APPLICATION 127 The following changes to Facility Operating License NPF-1 are requested (proposed replacement pages are provided as Attachment 1).

DESCRIPTION OF CHANGE Surveillance Requirement 4.7.3.1.c is revised to include the following signals for automatic valve closure, as appropriate:

1. A Containment isolation signal,

2. A Containment isolation signal coincident with a low CCW surge tank level, or

3. A high-high Containment pressure signal.

REASGN FOR CHANGE The CCW to RCP supply and return valves (MO-3294, MO-3296, MG-3300, and MO-3320) originally were designed to close upon receipt of a Containment isolation signal. This was changed to close the valves on a Containment high-high pressure signal or a Containment isolation coincident with a low CCW surge tank level.

The proposed revision to Surveillance Requirement 4.7.3.1.c addresses this change.

SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION Termination of CCW to the RCPs on a Containment isolation signal alone requires an evaluation by the operators as to whether continued operation of the RCPs is necessary. If the RCPs are required to operate, manual action must be taken to restore CCW to the RCPs. Failure to act promptly can result in damage to the RCPs due to loss of cooling water.

By isolating CCW flow to the RCPs on a Containment high-high pressure signal or a Containment isolation signal coincident with a low CCW surge tank level, a spurious or bona fide Containment isolation signal by itself will not require the operators to give immediate attention to the RCPs. This is because CCW is still flowing to the RCPs. In addition, the RCPs will now be available for transients and accidents for which they previously could have been made inoperable.

This change does not increase the probability or consequences of an accident, does not create the possibility of a new or different kind of accident, nor does it reduce a margin of safety since: (1) the likeli-hood of RCP damage has been reduced, (2) the availability of the RCPs during selected transients is enhanced, and (3) the integrity of safety-related portions of the CCW System is still assured. Based on the above, this change does not pose a significant hazard.

LCA 127 Page 2 of 2 This change is consistent with the reconunendations of NRC Generic Letter 83-10d.

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 operations remain consistent with the Updated FSAR, adequate surveillance is maintained, and there is no conceivable impact upon the environment.

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