ML20237D680

Application for Amend to License NPF-1 Consisting of License Change Application 160,changing Tech Specs to Delete Requirement for Obtaining source-range Nuclear Instrument Detector Plateau Curves

ML20237D680
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	12/18/1987
From:	Cockfield D PORTLAND GENERAL ELECTRIC CO.
To:
Shared Package
ML20237D674	List: ML20237D672 ML20237D680 ML20237D697
References
TAC-66871, NUDOCS 8712240122
Download: ML20237D680 (3)

Text

PORTLAND GENERAL ELECTRIC COMPANY EUGENE WATER & ELECTRIC BOARD AND PACIFIC POWER & LIGHT COMPANY Operating License NPF-1 Docket 50-344 License Change Application 160 This License Change Application requests modifications to Operating License NPF-1 for the Trojan Nuclear Plant to delete the requirement for obtaining source-range nuclear instrument detector plateau curves.

PORTLAND GENERAL ELECTRIC COMPANY BL '

D.W.C[kfield Vice President Nuclear Subscribed and sworn to before me this 18th day of December 1987.

7 Notary [Ubfic 'of Oregon My Commission Expires:

~~

NOTARY PUBlI O EGON I

My, commission Emirn /QQQ 8712240122 87121B PDR ADOCK 05000344 p PDR

e-LCA 360 Page.1 of 2 DESCRIPTION OF CHANGE In the Trojan Technical Specifications, Page 3/4 3-12. Table 4.3-1, Footnote (5) currently requires that " detector plateau curves shall be obtained and evaluated" for the source-range nuclear instrument detectors. Footnote (5) is changed-to read "With the high-voltage setting varied as' recommended by the manufacturer, an initial discrimi-nator bias curve shall be measured for each detector. Subsequent dis-criminator bias curves shall be obtained, evaluated, and compared to the-initial curves".

REASON FOR CHANGE The Westinghouse low-noise source range preamplifier alignment procedure does not require obtaining high-voltage plateau curves as part of the alignment procedure. Instead, a discriminator bias curve is required to be obtained and.is compared with later discriminator bias curves to determine if any degradation is occurring. This change will make the

. Trojan Technical Specifications consistent with the Westinghouse recom-mendations for determining degradation of the low-noise source range 1 preamplifier.

SIGNIFICANT HAZARDS CONSIDERATIONS In'accordance with the requirements of 10 CFR 50.92, this License-Change Application has been determined to involve no significant hazards based upon the following considerations:-

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

The functions of the source range instrumentation are not being changed or degraded as a result of this change. This change is administrative in that it involves incorporating the vendor recommen-dations for obtaining data Which is.used to determine if source range detector degradation is occurring. Therefore, this change does not involve an increase in the probability or consequences of an accident.

2. Does the proposed license amendment create the possibility of a new or different kind of accident from any accident previously evaluated?

The source-range instrumentation monitors neutron flux during shut-down and low-power operations and provides high-neutron flux trip input to the Reactor Protection System. No changes are proposed.to the operational characteristics of the source range instrumentation

,nor in the manner in which the system operates. Thus, this change does not create the possibility of.a new or different kind of acci-dent from any accident previously evaluated.

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LCA 160 Page 2 of 2

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

There are no changes being made to the source range instruments or in the manner.in'which the system is operated. The automatic actions,

. response times, setpoints and alarms of the source range neutron instrumentation are not affected by this change. Therefore, the pro-posed amendment does not involve a reduction in a margin of safety.

In the March 6, 1986 Federal Register, the NRC provided certain examples of amendments that are considered not likely to involve significant hazards considerations. Example (i) is a purely administrative change to technical specifications: for example, a change to achieve consistency throughout the technical specifications, correction of an error, or a change in nomenclature. The proposed change is similar to Example (i) in that it is a change to achieve consistency between the technical specifications and the manufacturer's recommendations for identifying component degradation.

Therefore, based on the above discussion, this change has been determined not to involve a significant hazards consideration.

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 operationt remain consistent with the Updated FSAR, adequate surveillance is maintained, and there is no significant adverse impact upon the environment.

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