ML20244E611

Application for Amend to License NPF-1,changing Orifice Size of Steam Line Safety Valves Shown in Tech Spec Table 4.7-1, Steam Line Safety Valves Per Loop

ML20244E611
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	06/12/1989
From:	Cockfield D PORTLAND GENERAL ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20244E606	List: ML20244E604 ML20244E611 ML20245C809
References
NUDOCS 8906210015
Download: ML20244E611 (3)

Text

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PORTLAND GENERAL ELECTRIC COMPANY EUGENE WATER & ELECTRIC BOARD AND PACIFIC POWER & LIGHT COMPANY Operating License NPF-1 Docket 50-344 License Change Application 177 This License Change Application requests modifications to Operating License NPF-1 for the Trojan Nuclear Plant to change the orifice size of the steam line safety valves shown in Trojan Technical Specification (TTS) Table 4.7-1, " Steam Line Safety Valves per Loop".

PORTLAND GENERAL ELECTRIC COMPANY

'B D. W/Cockfield Vice President Nuclear Subscribed and sworn to befort up this 12th day of June 1989.

%+/.O AJ mhn-wd Nothary Public of Oregon ,L Hy Conunir,sion Expires: h #, /9 AQ V /"

8906210015 ADOCK O B h44 POR PNV P

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Attachment A LCA 177 Page 1 of'2 DESCRIPTION OF CHANGE The following change is proposed to the Trojan Technical Specification (TTS) Table 4.7-1, " Steam Line Safety Valves per Loop".

Change orifice size, Lines a and b, from:

Q = 11.05.sq in, to Q = 12.174 sq in.

REASON FOR CHANGE A TTS surveillance audit discovered that the orifice area identified in TTS Table.4.7-1, Lines a and b is discrepant with respect to the actual orifice area. The steam flow through these valves during blowdown as described in Table 10.3-1 of the Trojan Nuclear Plant-Final Safety Analysis Report (FSAR) further confirms the error in the orifice sizing.

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 orifice area for the steam line safety valves was incorrectly listed in TTS Table 4.7-1. The proposed change incorporates the correct orifice area and establishes consistency between the installed valves, the FSAR, and TTS.

The 12.174 square inch (sq. in.) orifice area was used to calculate valve capacities used in the safety analysis. A formula certified by the National Board of Boiler's;nd Pressure Vessel Inspectors.

Section III, was used in these calculation. This crifice area was ,

also used in test methods for calculating 13ft setpoints. The valve manufacturer har verified the 12.174 sq. in. orifice area and test methods being used are correct. Thus the preposed change is editorial in nature and Sac not changed the probability or consequences of an accident.

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

As discussed above, the proposed change is editorial in nature and has no effect on-the accident analysis

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

safety.

As discussed above, the proposed change is editorial in nature and has no effect on the accident analysis. No changes are proposed to the TTS requirements that all main steam line code safety valves t - - - - - _-_

L Attachment'A LCA 177 Page 2 of 2=

associated with each steam genera' tor be operable in Modes 1, 2, and 3, nor to the surveillance requirements that. operability be (with-lift settings as specified)-routinely demonstrated.

In the March 6,-1986 Federal Register (51 FR 7750), the NRC published a list of examples of license amendments that are not likely to; involve a significant hazards consideration. this change is similar to example (i) from this-list which states:

"A purely administrative change to technical specifications, eg.,

a change to achieve a consistency throughout the technical specifications, correction of an error, or a change in nomenclature."

This' change achieves consistency between the installed valves, FSAR, and TTS.

SAFETY / ENVIRONMENTAL EVALUATION-Safety and environmental evaluations were performed as required'by Title 10, Code of Federal Regulations, Part 50 and the TTS. This review determined that the proposed changes do not create an unreviewed safety question, norLdo they. create an unreviewed environmental question.

SCHEDULE CONSIDERATION It is requested that the effective date of this amendment be the date of issuance by the NRC.

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