[Federal Register Volume 70, Number 69 (Tuesday, April 12, 2005)]
[Notices]
[Pages 19106-19107]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E5-1675]
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NUCLEAR REGULATORY COMMISSION
[Docket No. 50-368]
Entergy Operations, Inc.; Arkansas Nuclear One, Unit 2;
Environmental Assessment and Finding of No Significant Impact
The U.S. Nuclear Regulatory Commission (NRC) is considering
issuance of an exemption from Title 10 of the Code of Federal
Regulations (10 CFR) Part 50, Appendix A, ``General Design Criteria For
Nuclear Power Plants,'' General Design Criteria (GDC) 57, ``Closed
system isolation valves,'' for Facility Operating License No. NPF-6,
issued to Entergy Operations, Inc. (the licensee), for operation of the
Arkansas Nuclear One, Unit 2 (ANO-2), located in Pope County, Arkansas.
Therefore, as required by 10 CFR 51.21, the NRC is issuing this
environmental assessment and finding of no significant impact.
Environmental Assessment
Identification of the Proposed Action
The proposed action would provide an exemption from the
requirements of 10 CFR Part 50, Appendix A, GDC 57, which requires that
certain lines that penetrate containment have at least one containment
isolation valve (CIV) which shall either be automatic, locked closed,
or capable of remote manual operation. The licensee requests an
exemption in order to operate at power with certain valves in the open
position. Specifically, the proposed exemption would allow ANO-2 to
operate at power with the applicable manual upstream CIVs associated
with the emergency feedwater (EFW) steam trap and the atmospheric dump
valve (ADV) drain steam trap (i.e., one applicable CIV per steam trap)
in the open position.
The proposed action is in accordance with the licensee's
application dated October 30, 2003, as supplemented by letters dated
July 1, November 15, and December 3, 2004, and March 3, 2005.
The Need for the Proposed Action
The proposed action is needed to ensure the operability of the
steam-driven EFW pump and to prevent inoperability due to condensate
buildup, and to ensure that waterhammer does not damage the piping
associated with the ADV due to condensate buildup.
GDC 57 states, ``Each line that penetrates primary reactor
containment and is neither part of the reactor coolant pressure
boundary nor connected directly to the containment atmosphere shall
have at least one containment
[[Page 19107]]
isolation valve which shall be either automatic, or locked closed, or
capable of remote manual operation. This valve shall be outside
containment and located as close to the containment as practical. A
simple check valve may not be used as the automatic isolation valve.''
However, in the case of ANO-2, operating with the EFW steam trap
upstream CIV closed and the ADV drain steam trap upstream CIV closed,
could pose a potential challenge to the operability of the steam-driven
EFW pump and could damage the piping associated with the ADV, due to
condensate buildup.
Operating with the EFW steam trap and ADV drain steam trap upstream
CIVs open results in having only the secondary system pressure boundary
inside containment as a barrier against the release of radioactivity to
the environment through the steam trap piping. However, operating with
the EFW steam trap upstream CIV closed and the ADV drain steam trap
upstream CIV closed could compromise the operability of the EFW pump
turbine and could damage the ADV piping, due to condensate buildup. The
licensee has evaluated the effects of the EFW steam trap and ADV drain
steam trap upstream CIVs being open during power operation, and has
shown this to have no impact on the consequences of any of the events
evaluated in the Safety Analysis Report (SAR). Therefore, the licensee
is requesting an exemption from the requirements of GDC 57 to keep
these valves open during operation.
Environmental Impacts of the Proposed Action
The NRC has completed its safety evaluation of the proposed action
and concludes that, in this case, it is not necessary for the subject
CIVs to be locked closed, automatic, or capable of remote manual
operation, as required in GDC 57, in order to achieve the underlying
purpose of GDC 57. The effects of these valves being open during power
operation has been evaluated and shown to have no impact on the
consequence of any of the postulated events that are evaluated in the
SAR. Thus, the NRC staff finds that the operation of ANO-2 with the
subject CIVs open is acceptable, and that the requested exemption from
GDC 57 is justified for ANO-2.
The details of the staff's safety evaluation will be provided in
the exemption that will be issued as part of the letter to the licensee
approving the exemption to the regulation.
The proposed action will not significantly increase the probability
or consequences of accidents. No changes are being made in the types of
effluents that may be released off site. There is no significant
increase in the amount of any effluent released off site. There is no
significant increase in occupational or public radiation exposure.
Therefore, there are no significant radiological environmental impacts
associated with the proposed action.
With regard to potential non-radiological impacts, the proposed
action does not have a potential to affect any historic sites. It does
not affect non-radiological plant effluents and has no other
environmental impact. Therefore, there are no significant non-
radiological environmental impacts associated with the proposed action.
Accordingly, the NRC concludes that there are no significant
environmental impacts associated with the proposed action.
Environmental Impacts of the Alternatives to the Proposed Action
As an alternative to the proposed action, the staff considered
denial of the proposed action (i.e., the ``no-action'' alternative).
Denial of the application would result in no change in current
environmental impacts. Installing remote manual operators on the CIVs
was considered as an alternative to bring the CIVs into compliance with
GDC 57. However, the staff believes that any potential safety benefit
derived from installing remote manual operators on the subject CIVs
would not be commensurate with the cost associated with such a
modification. The environmental impacts of the proposed action and the
alternative action are similar.
Alternative Use of Resources
The action does not involve the use of any different resources than
those previously considered in the Final Environmental Statement
related to the operation of Arkansas Nuclear One, Unit 2, NUREG-0254,
dated June 1977.
Agencies and Persons Consulted
In accordance with its stated policy, on January 13, 2005, the
staff consulted with the Arkansas State official, Dave Baldwin of the
Arkansas Department of Health, regarding the environmental impact of
the proposed action. The State official had no comments.
Finding of No Significant Impact
On the basis of the environmental assessment, the NRC concludes
that the proposed action will not have a significant effect on the
quality of the human environment. Accordingly, the NRC has determined
not to prepare an environmental impact statement for the proposed
action.
For further details with respect to the proposed action, see the
licensee's letter dated October 30, 2003, as supplemented by letters
dated July 1, November 15, and December 3, 2004, and March 3, 2005.
Documents may be examined, and/or copied for a fee, at the NRC's Public
Document Room (PDR), located at One White Flint North, 11555 Rockville
Pike (first floor), Rockville, Maryland. Publicly available records
will be accessible electronically from the Agencywide Documents Access
and Management System (ADAMS) Public Electronic Reading Room on the
Internet at the NRC Web site, http://www.nrc.gov/reading-rm/adams.html.
Persons who do not have access to ADAMS or who encounter problems in
accessing the documents located in ADAMS should contact the NRC PDR
Reference staff by telephone at 1-800-397-4209 or 301-415-4737, or send
an e-mail to [email protected].
Dated at Rockville, Maryland, this 6th day of April 2005.
For the Nuclear Regulatory Commission.
Thomas W. Alexion,
Project Manager, Section 1, Project Directorate IV, Division of
Licensing Project Management, Office of Nuclear Reactor Regulation.
[FR Doc. E5-1675 Filed 4-11-05; 8:45 am]
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