ML20205T309

Environ Assessment & Finding of No Significant Impact Re Rev to Tech Spec by Replacing Requirement to partial-stroke Test Reactor Depressurization Sys to full-stroke Test All Four Valves Each Refueling Outage

ML20205T309
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	11/04/1988
From:	Virgilio M Office of Nuclear Reactor Regulation
To:
Shared Package
ML20205T290	List: ML20205T286 ML20205T309
References
NUDOCS 8811140208
Download: ML20205T309 (3)

Text

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7590-01 l

UNITED STATES NUCLEAR REGULATORY CO>NISSION CONSUMERS POWER COMPANY DOCKET NO. 50-155 ENVIRONMENTAL ASSESSMENT AND FINDING OF NO SIGNIFICANT IMPACT The U.S. Nuclear Regulatory Commission (the Commission) is considering issuance of an amendment to Facility Operating License No. DPR-6 for the Big Rock Point Plant, located in Charlevoix County, Michigan, and operated by Consumers Power Company (the licensee).

ENVIRONMENTAL ASSESSMENT Identification of Proposed Action:

In accordance with the licensee's application dated July 5, 1988, as modified October 10, 1988, the proposed amendment would modify Big Rock Point t

Plant Technical Specifications by replacing the requirement to partial-stroke test the Reactor Depressurization System (RDS) depressurizing valves quarterly with a requirement to full-stroke test all four depressurizing valves each refueling outage. f The Need for the proposed Action:

The proposed amendment is necessary because the currently required partial-stroke test has been found to be both a less-than-optimum test of valve operability and a substantial contributor to the causes of RDS depressurizing valve pilot valve leakage. That leakage, in turn, has been the cause of a substantial proportion of the plant's forced outages. Because, in general, a plant in a stable state is inherently less public risk than a plant in a changing state, those cooldowns and heatups have created unnecessary public risk. The proposed full-stroke test cycle, although with less frequent testing, does provide the optimum test of valve operability with less inherent risk to the public.

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2-1 Environmental Impacts of the Proposed Action:

Based upon the analysis contained in the Safety Evaluation to be issued i with the proposed amendment, the proposed action will not involve a significant  !

I change in the probability or consequences of any accident previously evaluated. l Consequently, any radiological releases would not be significantly greater than l i

previously determined, nor does the proposed amendment otherwise affect radiological plant effluents. Therefore, the Comission concludes that there are no significant radiological environmental impacts associated with the proposed arsndment. I With regard to nonradiological impacts, the proposed amendment does not affect nonradiological plant effluents and has no other environmental impact. l Therefore, the Commission concludes that there are no significant nonradiological

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environmental impacts associated with the proposed amendment.

Alternative to the Proposed Action:

Because the Comission has concluded that there are no significant  !

environmental impacts associated with the proposed action, there is no need to '

examine alternatives to the proposed action.

Alternative Use of Resources: -

This action does not involve the use of resources beyond the scope of  :

resources used during normal plant operation 7 Agencies and Persons Consulted:  !

The Comission's staff has reviewed the licensee's request and did not [

consult other agencies or persons.

FINDING OF NO SIGNIFICANT IMPACT I I

The Comission has determined not to prepare an environmental impact statement for the proposed amendment. I i

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• 3-o Based upon the foregoing environmental assessment, the Commission concludes that the proposed action will not have a significant effect on the quality of the human environment.  ;

For further details with respect to this action, see the requests for amendment dated July 5, 1988, and October 10, 1988, which are available for public inspection at the Commission's Public Document Room, Gelman Building, 2120 L Street, NW., Washington, DC, and a the North Central Michigan College, 1515 Howard Street, Petoskey, Michigan 49770.

Dated at Rockvilla, Maryland, this 4th day ofwovember 1988.

FOR THE NUCLEAR REGULATORY COMMISSION di Marti . rg lio Acting Assistant Director for Regions III and V Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation

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