ML20207M574

Application for Amend to License NPF-1,consisting of Rev 1 to License Change Application 134,revising Min Contained Vol of Water Required in Condensate Storage Tank

ML20207M574
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	01/09/1987
From:	Yundt C PORTLAND GENERAL ELECTRIC CO.
To:
Shared Package
ML20207M561	List: ML20207M554 ML20207M574 ML20207M579
References
TAC-60095, NUDOCS 8701130223
Download: ML20207M574 (3)

Text

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i PORTLAND GENERAL ELECTRIC COMPANY EUGENE WATER & ELECTRIC BOARD AND PACIFIC POWER & LIGHT COMPANY Operating License NPF-1 Docket 50-344 License Change Application 134, Revision 1 This License Change Application requests modifications to Operating License NPF-1 for the Trojan Nuclear Plant to revise the minimum contained volume of water required in the condensate storage tank.

PORTLAND GENERAL ELECTRIC COMPANY By /

C. undt, Manager Tec nical Functions Subscribed and sworn to before me this 9th day of January 1987.

i Notary Public of Oreggn wd [ #![

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L LCA 134, Revision 1 Page 1 of 2 i

l DESCRIPTION OF CHANGE l

1. The minimum contained volume of the condensate storage tank (CST) l required in the Limiting Condition for Operation of Trojan Technical i

Specification (TTS) 3.7.1.4 is changed from 196,000 gallons to 239,000 gallons.

2. The Bases of TTS 3/4.7.1.4 is expanded to describe the water volume required to be delivered to the steam generators, the unusable volume in the bottom of the CST, and the amount attributed to instrument error.

REASON FOR CHANCES The minimum contained volume required in the CST is increased from 196,000 gallons to 239,000 gallons to account for the unusable volume in the bottom of the tank (due to minimum vortex level) and instrument error.

This new volume requirement ensures at least 196,000 gallons is actually available to be delivered to the steam generators for Plant cooldown.

SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION In accordance with the requirements of 10 CFR 50.92, this license change request is judged to involve no significant hazards based upon the following information:

1. Does the proposed license change-involve a significant increase in the probability or consequences of an accident?

Increasing the minimum volume requirement for the CST provides greater asPurance of the availability of adequate water for Plant cooldown and thereby decreases the probability or consequences of an accident.

2. Does the proposed license change create the possibility of a new or differont kind of accident from any accident previously analyzed?

This change does not create the possibility of a new or different kind of accident, but rather improves the capability to provide adequate cooling with Plant systems.

3. Does the proposed license change involve a significant reduction in a margin of safety?

Since the minimum volume requirement for the CST is increased by this change, there is no reduction in a margin of safety. Rather, this change actually increases the margin of safety by accounting for unusable volume and instrument error.

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k LCA 134, Revision 1 Page 2 of 2 In the April 6, 1983 Federal Register, the NRC published a list of examples of amendments that are not likely to involve a significant hazards concern. Example No. 2 of that list applies to this change and states:

"A change that constitutes an additional limitation, restriction, or control not presently included in the technical specifications: for example, a more stringent surveillance requirement."

SAFETY / ENVIRONMENTAL EVALUATION .

Safety and environmental evaluations were performed as required by 10 CFR 50 and the Trojan Technical Specifications. This review determined 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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