ML20056F088
| ML20056F088 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 08/10/1993 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20056F083 | List: |
| References | |
| NUDOCS 9308260047 | |
| Download: ML20056F088 (3) | |
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7590-01 UNITED STATES NUCLEAR REGULATORY COMMISSION CONNECTICUT YANKEE ATOMIC POWER COMPANY DOCKET NO. 50-213 ENVIRONMENTAL ASSESSMENT AND FINDING.0F NO SIGNIFICANT IMPACT l
The U.S. Nuclear Regulatory Commission (the Commission) is considering i
issuance of an amendment to Facility Operating License No. DPR-61, issued to l
Connecticut Yankee Atomic Power Company (CYAPCO, the licensee), for operation of the Haddam Neck Plant, located in Middlesex County, Connecticut.
ENVIRONMENTAL ASSESSMENT Identification of the Proposed Action:
The proposed amendment will amend the Technical Specifications (TS) to reflect the transitioning of the stainless steel clad core to one with zircaloy cladding. The proposed action is in accordance with the licensee's amendment request dated April 23, 1993, with supplemental information provided by letter dated June 17, 1993.
The Need for the Proposed Action:
The licensee is in the process of transitioning from a stainless steel clad core to a zircaloy clad core. With zircaloy cladding the boron worth i
- increases and thus, a given change in the boron concentration produces a greater change in the overall core reactivity. Therefore, an increase in the t
shutdown margin is required to compensate for the additional reactivity added i
by a boron dilution eve, with a zircaloy clad core. This TS is needed to
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reflect the new boron shutdown margin requirements.
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l Environmental Imoacts of the Proposed Action:
The Commission has completed its evaluation of tha proposed revision to the TS. The TS increases the shutdown margin to 2000 pcm for Modes 1, 2, and 3 with four-loop operation, to 2800 pcm for Mode 3 with less than four-loop operation, and to 3400 pcm for Modes 4 and 5, or with only one of three boron injection paths available in Modes 1, 2, 3, and 4, or with only one charging l
pump available in Modes 1, 2, 3, and 4, or with the boric acid tank inoperable in Modes 1, 2, 3, and 4.
The NRC staff has reviewed these changes to the TS as a result of the transitioning to zircaloy clad fuel and has determined that.the new boron t
concentrations will provide sufficient shutdown margin requirements, and that these requirements can be achieved with the minimum boric acid tank volume or the minimum refueling water storage tank (RWST) volume specified in the TS.
These TS changes will not increase the probability or consequences of i
accidents, no changes are being made in the types of any effluents that may be released offsite, and there is no significant increase in the allowable I
individual or cumulative occupational radiation exposure. Therefore, the Commission concludes that there are no significant radiological environmental impacts associated with the proposed TS amendment.
With regard to potential nonradiological impacts, the proposed amendment does involve features located entirely within the restricted area as defined in 10 CFR Part 20.
It does not affect nonradiological plant effluents and has i
no other environmental impact. Therefore, the Commission concludes that there are no significant nonradiological environmental impacts associated with the proposed amendment.
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9 Alternatives to the Proposed Action:
Since the Commission has concluded there is no measurable environmental impact associated with the proposed amendment, any alternatives with equal or greater environmental impact need not* be evaluated. The principal alternative.
to the amendment would be to deny the amendment request.
Such action would i
not enhance the protection of the environment.
Alternative Use of Resources:
This actir does not involve the use of resources not considered previously it. te nal Environmental Statement for Haddam Neck.
Aaencies and Persons Consulted:
The NRC staff consulted with the State of Connecticut regarding the environmental impact of the proposed action.
FINDING 0F NO SIGNIFICANT IMPACT Based upon the environmental assessment, the Comission concludes that the proposed action will not have a significant effect on the quality of the human environment. Accordingly, the Commission has determined not to prepare an environmental impact statement for the proposed amendment.
j For further details with respect to this proposed action, see the j
licensee's letters dated April 23, 1993 and June 17, 1993. These letters are available for public inspection at the Commission's Public Document Room, the Gelman Building, 2120 L Street, NW., Washington, DC 20555, and at the local public document room located at the Russell Library,123 Broad Street, Middletown, Connecticut 06547.
Dated at Rockville, Maryland this 10th day of August 1993.
FOR THE NUCLEAR REGULATORY COMMISSION Ofgh Ero]f F. Stolz, Director Johr ect Directorate I-Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
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