ML20247C877

Application for Amend to License NPF-1 Consisting of License Change Application 179.Amend Changes Description of Turbine Steam Supply Valves in Tech Spec Table 3.6-1 from motor-operated to air-operated

ML20247C877
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	07/19/1989
From:	Cockfield D PORTLAND GENERAL ELECTRIC CO.
To:
Shared Package
ML20247C870	List: ML20247C865 ML20247C877 ML20247C894
References
NUDOCS 8907240471
Download: ML20247C877 (3)

Text

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l PORTLAND GENERAL ELECTRIC COMPANY EUCENE WATER & ELECTRIC DOARD AND PACIFIC POWER & LICHT COMPANY

' Operating License NPF-1 Docket 50-344 License Change Application 179 This License change Application requests modifications to Operating License NPF-1 for the Trojan Nuclear Plant to revise the Trojan Technical Specifications to correct the description of the turbine steam supply valves in Trojan Technical Specification Table 3.6-1 from motor-operated to air-operated.

PORTLAND CENERAL ELECTRIC C0ftPANY By D. W. Cockfleltf Vice President  ;

Nuclear )

l Subscribed and sworn to before me this 19th day of July 1989.

d AH hhD Notary Public of Ov'egon

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OMyCommissio / ,

8907240471 890719 PDR ADOCK 05000344 P PDC o(

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. Attachment A LCA 179 i Page 1 of 2 -l DESCRIPTION OF CHANCE The four valves of-the main steam supply to the auxiliary feedwater (AFW) pump turbine driver shown in Trrdan Technical Specification (TTS)

Table 3.6-1 are changed from MO 2218, 2228, 2238 and 2248 to CV 1451, 1452, 1453 and 1454, respective 3y.

REASON FOR CHANCE Request for Design Change (RDC)80-003 modified the AFW turbine pump design to be independent of alternating current power. This modification included changing the turbine steam supply valves from motor-operated to air-operated. Nonconfonaing Activity Report H38-04M documents that the safety evaluation performed for RDC 80-003 in 1980 failed to identify the changes necessary to the TTS. This LCA makes the necessary correction by incorporating the previously implemented design changes into TTS Table 3.6-1.

SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION The proposed change does not involve a significant hazard for the reasons discussed below:

1. This change does not involve a significant increase in the probability or consequences of an accident previously evaluated.

The design change from motor-operated to air-operated valves improves the AFW system design by making the valve's operation independent of alternating current power. The change is consistent with NRC guidance provided in Standard Review Plan (NUREG-0800),

Section 10.4.9. In addition, the NRC provided approval of this design change in their Safety Evaluation Report, " Implementation of Recommendations for Auxiliary Feedwater Systems" dated October 23, 1980. The valve's function to automatically open to admit steam to the turbine-driven AFW pump remains the same; so therefore, accident consequences have not increased over accidents previously evaluated.

Further, the AFW system serves to mitigate the consequences of an accident, and thus, it's operation is not relevant to accident probability. 1 The TTS change proposed is administrative, in that it revises the TTS to correctly identify the valves currently 2nstalled.

2. This change does not create the possibility of a new or different kind of accident from any accident previously evaluated.

As discussed above: the proposed TTS change is administrative, and has no effect on the accident analysiv.

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. . . ., . :- . .. .4

. i Attachment A LCA 179-page 2 of 2

3. This change does not involve a significant reduction in a' margin of safety.

The design change to replace the motor operators with air operators ,

was done to' improve.AFW system operation,.and therefore, the margin ~ I of safety is not reduced. The proposed change corrects the identification of valves which have already' been incorporated into  ;

l the design, and as such, it is an administrative change with no effect on. safety margin..

-In'the March 6, 1986, Federal Register ($1 FR 7750), the NRC published a list.of examples of license amendments that.are not likely to involve's .I significant hacards consideration. Example (i) from this list states:

"A purely administrative change to Technical Specifications, eg, a .

4 change o achieve a consistency throughout the Technical.Specif1-cations correction of an error, or a: change in nomenclature."

The proposed change corrects the identification oflthe turbinemtriven AFW pump steam supply valves and is similar to Example (1) discussed above.

Accordingly, the proposed change does not involve a significant hazards consideration.

SAFETY / ENVIRONMENTAL EVALUATION Safety and environmental evaluations were performed as required by 10 CFR 50 and'the TTS. This review determined that the proposed changes-do not create an'unreviewed safety question, nor do they create an  ;

unreviewed environmental question. i SCHEDULE CONSIDERATION It is requested that the effective date of this amendment be two weeks  ;

after the date of issuance by the NRC.  ;

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l DB0/3184W ,