[Federal Register Volume 80, Number 83 (Thursday, April 30, 2015)]
[Notices]
[Pages 24293-24294]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2015-10076]
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NUCLEAR REGULATORY COMMISSION
[NRC-2015-0107]
Net Positive Suction Head for Emergency Core Cooling and
Containment Heat Removal System Pumps
AGENCY: Nuclear Regulatory Commission.
ACTION: Regulatory guide; withdrawal.
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SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is withdrawing
regulatory guide (RG), RG 1.1 ``Net Positive Suction Head for Emergency
Core Cooling and Containment Heat Removal System Pumps.'' The guide is
being withdrawn because the same guidance is provided with more detail
by RG 1.82, ``Water Sources for Long-Term Recirculation Cooling
Following a Loss-of-Coolant Accident.''
DATES: Effective April 30, 2015, the NRC withdraws RG 1.1.
ADDRESSES: Please refer to Docket ID NRC-2015-0107 when contacting the
NRC about the availability of information regarding this document. You
may obtain publicly-available information related to this document
using any of the following methods:
[[Page 24294]]
Federal Rulemaking Web site: Go to http://www.regulations.gov and search for Docket ID NRC-2015-0107. Address
questions about NRC dockets to Carol Gallagher; telephone: 301-415-
3463; email: [email protected]. For technical questions, contact
the individual(s) listed in the FOR FURTHER INFORMATION CONTACT section
of this document.
NRC's Agencywide Documents Access and Management System
(ADAMS): You may obtain publicly-available documents online in the
ADAMS Public Documents collection 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]. The
ADAMS accession number for each document referenced (if it available in
ADAMS) is provided the first time that a document is referenced.
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: Ahsan Sallman, Office of Nuclear
Reactor Regulation, telephone: 310-415-2380 email:
[email protected], and Richard Jervey, Office of Nuclear Regulatory
Research, telephone: 301-251-7404, email: [email protected]. Both
are staff of the U.S. Nuclear Regulatory Commission, Washington, DC
20555-0001.
SUPPLEMENTARY INFORMATION:
I. Introduction
The NRC is withdrawing RG 1.1 because its guidance has been
incorporated into RG 1.82, ``Water Sources for Long-Term Recirculation
Cooling Following a Loss-of-Coolant Accident.''
II. Further Information
The withdrawal of RG 1.1 does not alter any prior or existing
licensing commitments based on its use. Although a regulatory guide is
withdrawn, its use in existing licenses is still valid, and changes to
the licenses can be accomplished using other regulatory products.
Withdrawal of an RG means that the guide no longer provides useful
information or has been superseded by other guidance, technological
innovations, congressional actions, or other events. A withdrawn guide
should not be used for future NRC licensing activities.
This RG 1.1 provides guidance on meeting the requirements in part
50, appendix A of Title 10 of the Code of Federal Regulations (10 CFR),
General Design Criteria (GDC), GDC 35, ``Emergency Core Cooling,'' and
GDC 38, ``Containment Heat Removal.'' The GDC 35 and 38 require that
the emergency cooling and containment heat removal systems be capable
of accomplishing their required safety functions assuming loss of
offsite power and single failure. The ability to accomplish these
safety functions reliably depends in part on the proper performance of
system pumps which, in turn, depends on the conditions under which the
pumps must operate. One of these conditions is suction pressure and the
closely related characteristic net positive suction head. The
information in RG 1.82 has been updated from extensive reviews of the
emergency core cooling system recirculation systems which have reduced
the uncertainties contained in modeling studies of these systems. The
NRC staff has determined that the RG 1.82 guidance is more thorough and
provides the needed detail to allow consideration of nuances in design
which were not contemplated when RG 1.1 was written in 1970.
The guidance from RG 1.1 pertaining to suction pressure and net
positive suction head has been incorporated into RG 1.82, ``Water
Sources for Long-Term Recirculation Cooling Following a Loss-of-Coolant
Accident,'' which includes detailed guidance related to emergency
cooling systems. The RG 1.1 is superseded by RG 1.82.
Dated at Rockville, Maryland, this 23rd day of April, 2015.
For the Nuclear Regulatory Commission.
Thomas H. Boyce,
Chief, Regulatory Guidance and Generic Issues Branch, Division of
Engineering, Office of Nuclear Regulatory Research.
[FR Doc. 2015-10076 Filed 4-29-15; 8:45 am]
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