[Federal Register Volume 60, Number 127 (Monday, July 3, 1995)]
[Notices]
[Pages 34559-34560]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-16248]
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NUCLEAR REGULATORY COMMISSION
[Docket No. 50-289]
GPU Nuclear Corporation; Three Mile Island Nuclear Station, Unit
1 Environmental Assessment and Finding of No Significant Impact
The U.S. Nuclear Regulatory Commission (the Commission) is
considering issuance of an exemption from the provisions of 10 CFR
50.44, 10 CFR 50.46, and appendix K to 10 CFR part 50 to GPU Nuclear
Corporation (GPUN, the licensee) for Three Mile Island Nuclear Station,
Unit 1 (TMI-1), located in Dauphin County, Pennsylvania.
Environmental Assessment
Identification of Proposed Action
The proposed action would enable the licensee to use demonstration
fuel assemblies that contain some fuel rods whose zirconium-based
cladding composition is somewhat different from the zirconium based
compound named zircaloy. These demonstration assemblies would be loaded
into TMI-1 during the upcoming September 1995 refueling outage and
irradiated through fuel Cycles 11, 12, and 13.
The proposed action is in accordance with the licensee's
application for exemption of June 1, 1995.
The Need for the Proposed Action
The proposed exemption to 10 CFR 50.44, 10 CFR 50.46, and appendix
K to 10 CFR part 50 is needed because these regulations specifically
refer to light-water reactors containing fuel consisting or uranium
oxide pellets enclosed in zircaloy tubes. Zircaloy is a zirconium-based
alloy currently in use as cladding for fuel pellets. A new zirconium-
based cladding has been developed which is not the same chemical
composition as
[[Page 34560]]
zircaloy, and which the licensee wants to test in reactor operation.
Since 10 CFR 50.46 and 10 CFR part 50, appendix K limit Emergency Core
Cooling System (ECCS) calculations to zircaloy and 10 CFR 50.44 relates
to the generation of hydrogen gas from a metal-water reaction with
zircaloy, an exemption is required in order to place two demonstration
assemblies in the core. The staff has reviewed the chemical composition
of the new cladding and found no significant difference between the new
composition and zircaloy. Therefore, pursuant to 10 CFR 50.12, a
special circumstance exists in which application of these regulations
is not necessary to achieve the underlying purpose of the regulations.
The NRC staff finds that granting the requested exemption is authorized
by law, will not present an undue risk to the public health and safety,
and is consistent with the common defense and security. Thus, an
exemption is authorized by 10 CFR 50.12. The underlying purpose of 10
CFR 50.46 and 10 CFR 50 appendix K is to establish requirements for
calculations of emergency core cooling systems. The licensee addressed
the safety impact of the demonstration assemblies on emergency core
cooling system performance as part of the application for exemption and
demonstrated that the new zirconium based cladding does not affect the
ECCS calculations. The underlying purpose of 10 CFR 50.44 is to ensure
that means are provided for the control of hydrogen gas that may be
generated following a postulated loss-of-coolant accident. The licensee
previously addressed hydrogen generation following a loss-of-coolant
accident. The licensee's proposed action has no significant effect on
the previous assessment of hydrogen gas production.
Environmental Impacts of the Proposed Action
With regard to potential radiological impacts to the general
public, the proposed exemption involves features located entirely
within the restricted area as defined in 10 CFR part 20. It does not
affect the potential for radiological accidents and does not affect
radiological plant effluents. The demonstration assemblies meet the
same design bases as the fuel which is currently in the reactor. No
safety limits have been changed or setpoints altered as a result of the
use of these assemblies. The Final Safety Analysis Report (FSAR)
analyses are bounding for the demonstration assemblies as well as the
remainder of the core. The advanced zirconium-based alloys have been
shown through testing to perform satisfactorily under conditions
representative of a reactor environment. In addition, the relatively
small number of fuel rods involved does not represent a prohibitively
large inventory of radioactive material which could be released into
the reactor coolant in the event of cladding failure. The only credible
consequence of this change would be a failure of the demonstration
claddings. Even in the case of gross fuel failure, the number of rods
involved is less than 1% of the core and, thus, sufficiently small that
environmental impact would be negligible and is bounded by previous
assessments. The small number of fuel rods involved in conjunction with
the chemical similarity of the demonstration cladding to zircaloy
cladding ensures that hydrogen production would not be significantly
different from previous assessments. As a result, the proposed
exemption does not affect the consequences of radiological accidents.
Consequently, the Commission concludes that there are no significant
radiological impacts associated with the proposed exemption.
With regard to the potential environmental impacts associated with
the transportation of the demonstration assemblies, the advanced
cladding have no impact on previous assessments determined in
accordance with 10 CFR 51.52. With regard to potential nonradiological
impacts, the proposed exemption does not affect nonradiological plant
effluents and has no other environmental impact. Therefore, the
Commission concludes that there are no significant nonradiological
environmental impacts associated with the proposed exemption.
Alternatives to the Proposed Action
Because the Commission's staff has concluded that there is no
significant environmental impact associated with the proposed
exemption, any alternative to the proposed exemption will have either
no significantly different environmental impact or greater
environmental impact. The principal alternative would be to deny the
requested exemption. This would not reduce environmental impacts as a
result of plant operations.
Alternative Use of Resources
This action does not involve the use of resources not previously
considered in connection with the Final Environmental Statement related
to the operation of Three Mile Island Nuclear Station, Units 1 and 2,
issued by the Commission in December 1972.
Agencies and Persons Consulted
In accordance with its stated policy, the NRC staff consulted with
Richard Janati of the Pennsylvania Department of Environmental
Resources on June 9, 1995, regarding the environmental impact of the
proposed action. Mr. Janati had no comments on behalf of the
Commonwealth of Pennsylvania.
Finding of No Significant Impact
Accordingly, the Commission has determined not to prepare an
environmental impact statement for the proposed exemption.
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 request
for exemption dated June 1, 1995, which is available for public
inspection at the Commission's Public Document Room, 2120 L Street,
NW., Washington, DC 20555 and at the local public document room located
at the Law/Government Publication Section, State Library of
Pennsylvania, (Regional Depository) Walnut Street and Commonwealth
Avenue, Box 1601, Harrisburg, PA 17105.
Dated at Rockville, Maryland this 26th day of June, 1995.
For the Nuclear Regulatory Commission.
Ronald W. Hernan,
Acting Director, Project Directorate I-3, Division of Reactor
Projects--I/II Office of Nuclear Reactor Regulation.
[FR Doc. 95-16248 Filed 6-30-95; 8:45 am]
BILLING CODE 7590-1-M
