ML20141G157

Environ Assessment & Notice of Finding of No Significant Environ Impact Supporting Exemption to 10CFR50.61 Requirements for Protection Against Pressurized Thermal Shock Events

ML20141G157
Person / Time
Site:	Three Mile Island
Issue date:	12/30/1985
From:	Travers W Office of Nuclear Reactor Regulation
To:
Shared Package
ML20141G115	List: ML20141G108 ML20141G125 ML20141G157 ML20141G169 ML20141G184
References
REF-GTECI-A-49, REF-GTECI-RV, TASK-A-49, TASK-OR NUDOCS 8601090794
Download: ML20141G157 (3)

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i Enclosure 2 i

I UNITED STATES NUCLEAR REGULATORY COMMISSION

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I GENERAL PUBLIC UTILITIES NUCLEAR CORPORATION DOCKET NO. 50-320  ;

ENVIRONMENTAL ASSESSMENT AND NOTICE OF FINDING 1 0F NO SIGNIFICANT ENVIRONMENTAL IMPACT  !

The U.S. Nuclear Regulatory Comission (the Commission) is planning to j issue an Exemption relative to the Facility Operating License No. DPR-73 issued to General Public Utilities Nuclear Corporation (the licensee), for operation of the Three Mile Island Nuclear Station, Unit 2 (THI-2), located in Londonderry Township, Dauphin County, Pennsylvania. j I l ENVIRONMENTAL ASSESSMENT

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i Identification of Proposed Action: The action being considered by the f r

Comission is an exemption from assessments, analyses and other i

requirements of 10 CFR 50.61 for protection against pressurized thermal  ;

shock events. ,

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Specifically 10 CFR 50.61 requires the licensee to submit to tha l U.S. Nuclear Regulatory Commission projected values for reference I temperature for each weld and plate or forging in the reactor vessel-i '

beltline and an analysis and schedule for implementation of a flux i

reduction program if the projected values of reference temperature are ,

expected to exceed the pressurized thermal shock criterion set forth in i

Paragraph (b)(2) of 10 CFR 50.61.  ;

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The Need for the Action: Given the lack of pressurization of the Reactor Coolant System (RCS) and the low core and RCS temperatures, pressurized thermal shock is not a credible event. Accordingly, analyses to determine the potential for and actions to protect against pressurized thermal shock for each weld and plate or forging in the reactor vessel beltline are not warranted. Undertaking the analyses and other actions required by 10 CFR 50.61 would impose an unnecessary burden and expense on the licensee with no concomitant benefit.

Environmental Impacts of the Proposed Actions: The staff has evaluated the subject exemption and concludes that there are no significant radiological or nonradiological impacts to the environnent as a result of this action.

The exemption removes the Commission's requirement to conduct analyses and make assessments of pressurized thermal shock events.

Alternate to this Action: Since we have concluded that there is no significant environmental impact associated with the subject Exemption, any alternatives to this change will have either no significant environmental impact or greater environmental impact. This would not reduce significant environmental impacts of plant operations and would result in the appli-cation of unnecessary regulatory requirements.

Agencies and Persons Consulted: The NRC staff reviewed the licensee's request and did not consult other agencies or persons.

Alternate Use of Resources: This action does not involve the use of resources not previously considered in connection with the Final Programatic Impact Statement for THI-2 dated March 1981.

Finding of No Significant Impact: The Comission has determined not to prepare an environmental impact statement for the subject Exemption. Based upon the foregoing environmental assessment, we conclude that this action  ;

will not have a r,ignificant effect on the quality of the human environment.

For further details with respect to this action see; (1) Letter from F. R.

Standerfer, GPUNC, to B. J. Snyder, USNRC, 10 CFR 50.61 Exemption Request, dated August 27, 1985.

The above documents are available for inspection at the Comission's Local Public Document Room, 1717 H. Street, N.W., Washington, DC, and at the Comission's Local Public Document Room at the State Library of Pennsylvania, Government Publications Section, Education Building, ,

Comonwealth and Walnut Streets, Harrisburg, Pennsylvania 17126.

FOR THE NUCLEAR REGULATORY COMMISSION b,n J i m William D. Travers, Director TMI-2 Cleanup Project Directorate Office of Nuclear Reactor Regulation ,

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