[Federal Register Volume 77, Number 63 (Monday, April 2, 2012)]
[Notices]
[Pages 19740-19741]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2012-7805]
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NUCLEAR REGULATORY COMMISSION
[NRC-2010-0249]
Water Sources for Long-Term Recirculation Cooling Following a
Loss-of-Coolant Accident
AGENCY: Nuclear Regulatory Commission.
ACTION: Regulatory guide; issuance.
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SUMMARY: The U.S. Nuclear Regulatory Commission (NRC or the Commission)
is issuing a revision to Regulatory Guide (RG) 1.82, ``Water Sources
for Long-Term Recirculation Cooling Following a Loss-of-Coolant
Accident.'' RG 1.82 describes methods that the NRC staff considers
acceptable to implement requirements regarding the sumps and
suppression pools that provide water sources for emergency core
cooling, containment heat removal, or containment atmosphere cleanup
systems. RG 1.82 provides guidelines for evaluating the adequacy and
the availability of the sump or suppression pool for long-term
recirculation cooling following a loss-of-coolant accident.
ADDRESSES: Please refer to Docket ID NRC-2010-0249 when contacting the
NRC about the availability of information regarding this document. You
may access information related to this document, which the NRC
possesses and is publicly available, using the following methods:
Federal Rulemaking Web site: Go to http://www.regulations.gov and search for Docket ID NRC-2010-0249. Address
questions about NRC dockets to Carol Gallagher; telephone: 301-492-
3668; email: [email protected].
NRC's Agencywide Documents Access and Management System
(ADAMS): You may access publicly available documents online in the NRC
Library at http://www.nrc.gov/reading-rm/adams.html. To begin the
search, select ``ADAMS Public Documents'' and then select ``Begin Web-
based ADAMS Search.'' For problems with ADAMS, please contact the NRC's
Public Document Room (PDR) reference staff at 1-800-397-4209, 301-415-
4737, or by email to [email protected]. Revision 4 of Regulatory
Guide 1.82 is available
[[Page 19741]]
in ADAMS under Accession No. ML111330278. The regulatory analysis may
be found in ADAMS under Accession No. ML111330285.
NRC's PDR: You may examine and purchase copies of public
documents at the NRC's PDR, Room O1-F21, One White Flint North, 11555
Rockville Pike, Rockville, Maryland 20852.
FOR FURTHER INFORMATION CONTACT: John Burke, Mechanical and Electrical
Engineering Branch or Richard Jervey, Regulatory Guide Development
Branch, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory
Commission, Washington, DC 20555-0001, telephone (301) 251-7628 and
(301) 251-7404 or email: [email protected] and [email protected].
SUPPLEMENTARY INFORMATION:
I. Introduction
The NRC is issuing a revision to an existing guide in the agency's
``Regulatory Guide'' series. This series was developed to describe and
make available to the public information such as methods that are
acceptable to the NRC staff for implementing specific parts of the
agency's regulations, techniques that the staff uses in evaluating
specific problems or postulated accidents, and data that the staff
needs in its review of applications for permits and licenses.
Revision 4 of Regulatory Guide (RG) 1.82, ``Water Sources for Long-
Term Recirculation Cooling Following a Loss-of-Coolant Accident,'' was
issued with a temporary identification as Draft Regulatory Guide, DG-
1234. RG 1.82 describes methods that the NRC staff considers acceptable
to implement requirements regarding the sumps and suppression pools
that provide water sources for emergency core cooling, containment heat
removal, or containment atmosphere cleanup systems. RG 1.82 provides
guidelines for evaluating the adequacy and the availability of the sump
or suppression pool for long-term recirculation cooling following a
loss-of-coolant accident.
II. Further Information
DG-1234 was published in the Federal Register on July 15 2010, (75
FR 41241) for a 60-day public comment period. The public comment period
closed on September 10, 2010. RG. 1.82, was first issued in June 1974.
The NRC issued revisions to RG 1.82 in November 1985, May 1996, and
November 2003 to incorporate gains in the understanding of containment
sump performance, particularly debris blockage on the Emergency Core
Cooling System (ECCS) strainers, and provide guidance in determining
net positive suction head margin for the ECCS and the containment heat
removal system. Since the November 2003 revision, (Revision 3), was
issued supplemental information has been accumulated pertaining to ECCS
performance accounting for in-plant considerations such as generation
of debris and chemical effects associated with the debris circulating
in the ECCS systems. Additionally, the NRC issued GL 2008-01,
``Managing Gas Accumulation in Emergency Core Cooling, Decay Heat
Removal, and Containment Spray Systems,'' in January 2008, to address
gas accumulation in safety systems. The NRC obtained significant
testing and analysis methodology information relative to pump
characteristics affected by fluid voiding and gas transport as a
function of system flow conditions which are germane to RG 1.82. This
revision of RG 1.82 includes the latest information, and incorporates
revised staff regulatory positions reflected in several safety
evaluations performed upon ECCS performance testing results since the
RG 1.82 Revision 3 was issued. Public comments on DG-1234 and the staff
responses to the public comments are available in ADAMS under Accession
No. ML111330292.
Dated at Rockville, Maryland, this 16th day of March 2012.
For the Nuclear Regulatory Commission.
Richard A. Jervey,
Acting Chief, Regulatory Guide Development Branch, Division of
Engineering, Office of Nuclear Regulatory Research.
[FR Doc. 2012-7805 Filed 3-30-12; 8:45 am]
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