[Federal Register Volume 77, Number 188 (Thursday, September 27, 2012)]
[Proposed Rules]
[Pages 59345-59346]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2012-23792]
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Proposed Rules
Federal Register
________________________________________________________________________
This section of the FEDERAL REGISTER contains notices to the public of
the proposed issuance of rules and regulations. The purpose of these
notices is to give interested persons an opportunity to participate in
the rule making prior to the adoption of the final rules.
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Federal Register / Vol. 77, No. 188 / Thursday, September 27, 2012 /
Proposed Rules
[[Page 59345]]
NUCLEAR REGULATORY COMMISSION
10 CFR Parts 50, 52, 54, and 100
[Docket No. PRM-50-106; NRC-2012-0177]
Environmental Qualifications of Electrical Equipment
AGENCY: Nuclear Regulatory Commission.
ACTION: Petition for rulemaking; notice of receipt.
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SUMMARY: The U.S. Nuclear Regulatory Commission (NRC or the Commission)
received a petition for rulemaking (PRM), dated June 18, 2012, which
was filed with the NRC by the Natural Resources Defense Council, Inc.
(NRDC) and Mr. Paul M. Blanch (collectively, the petitioners). The
petition was docketed by the NRC on June 22, 2012, and assigned Docket
No. PRM-50-106. The petitioners request that the NRC initiate a
rulemaking ``to revise its regulations to clearly and unequivocally
require the environmental qualification of all safety-related cables,
wires, splices, connections and other ancillary electrical equipment
that may be subjected to submergence and/or moisture intrusion during
normal operating conditions, severe weather, seasonal flooding, seismic
events, and post-accident conditions, both inside and outside of
containment.'' The NRC is not instituting a public comment period for
this PRM at this time.
ADDRESSES: Please refer to Docket ID NRC-2012-0177 when contacting the
NRC about the availability of information for this petition. You may
access information related to this petition, which the NRC possesses
and are publicly available, by any of the following methods:
Federal Rulemaking Web Site: Go to http://www.regulations.gov and search for Docket ID NRC-2012-0177. 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 ``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 in this notice (if that document is available in ADAMS) is
provided the first time that a document is referenced. The petition,
PRM-50-106, is available in ADAMS under Accession Number ML12177A377.
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: Cindy Bladey, Chief, Rules,
Announcements, and Directives Branch, Division of Administrative
Services, Office of Administration, U.S. Nuclear Regulatory Commission,
Washington, DC 20555-0001; telephone: 301-492-3667, email:
[email protected].
SUPPLEMENTARY INFORMATION:
I. The Petitioners
The NRDC ``is a national non-profit membership environmental
organization with offices in New York City, Washington, DC, San
Francisco, Chicago, Los Angeles, and Beijing.'' The NRDC's ``activities
include maintaining and enhancing environmental quality and monitoring
federal agency actions to ensure that federal statutes enacted to
protect human health and the environment are fully and properly
implemented.'' Mr. Paul Blanch, the primary author of the petition,
``is a consultant and expert witness'' on ``nuclear and electrical
engineering.''
II. The Petition
The petitioners request that the NRC ``institute a rulemaking to
revise the regulatory requirements for the environmental qualification
of electrical equipment important to the safe operation of existing and
new reactors.'' Specifically, the petitioners request that ``the
regulatory requirements contained in 10 CFR Sec. 50.49, Criteria 2 and
4 in Appendix A to 10 CFR 50, and 10 CFR 54 * * * be clarified and
supplemented with regard to the environmental qualification of
electrical equipment exposed to `submergence in water, condensation,
wetting, and other environmental stresses' during routine operation and
infrequent events (e.g., flooding).''
The petitioners state that the designs for nuclear power plants
currently operating in the U.S. ``feature electrical cables and wires
between power sources (e.g., transformers, batteries and emergency
power supplies) and safety equipment throughout the facility.'' The
petitioners further state that ``[w]ith few exceptions, these cables
and wires are only designed for dry, low humidity environments and,
therefore, not qualified for moist or wet environments. Cables and
wires with insulation surface defects caused during or exacerbated by
installation are more prone to failure when submerged in water or
subjected to moisture intrusion. It was generally assumed (petitioner
Blanch included) that these containers would remain dry.'' The
petitioners assert that ``[b]y existing NRC regulation, it was
unnecessary to specify that these cables and wire remain functional
under submerged conditions.''
The petitioners state that ``General Design Criterion (GDC) 2,
Design Bases for Protection Against Natural Phenomena, and GDC 4,
Environmental and Dynamic Effects Design Bases, established regulatory
requirements for the design of nuclear power plants.'' The petitioners
assert that ``[t]he large number of electrical failures that were
experienced during the Three Mile Island (TMI) accident in March 1979
demonstrated that these regulatory requirements, or their enforcement,
were inadequate to ensure that electrical equipment would remain
functional.''
The petitioners interpret NUREG/CR-6384, Vol. 1, ``Literature
Review of Environmental Qualification of Safety-Related Electric
Cables'' (ADAMS Accession Number ML031600732), dated April 1996, to
indicate that ``[t]he aforementioned `high probability of impairment'
that helped focus the selection of cable penetrations during TMI
inspections already indicates that moisture and submersion causes cable
damage and demonstrates NRC's acknowledgment of the matter thus
corroborating the necessity of this
[[Page 59346]]
rulemaking. If these conditions cause a high probability of impairment
following an accident, it is logical to assume that these conditions
produce a similar outcome in the absence of or prior to an accident as
well.''
The petitioners state that ``[t]he NRC recognized from the TMI
accident the need to strengthen the regulatory requirements for
electrical equipment. The NRC revised its regulations to include
specific requirements in 10 C.F.R. Sec. 50.49, wherein Sec. (e)(6)
explicitly addressed the submergence factor[.]'' The petitioners
further state that ``[t]he regulation did not further limit this
requirement to where the cables and wires were located. But the NRC
staff introduced such a limitation through * * * Generic Letter 82-09,
`Environmental Qualification of Safety-Related Electrical Equipment,'
[ADAMS Accession Number ML031080281], dated April 20, 1982[.]'' The
petitioners state that ``[r]ain water and ground water routinely
submerge underground cables and wires. The safety implications from the
failure of a safety-related cable inside containment submerged by an
accident, outside containment submerged by a high energy line break, or
outside containment submerged by nature are identical--that safety
function is lost. It matters little if the portion of a safety-related
cable inside containment and the portion of that same cable outside
containment in a high energy line break area survive if another portion
of that same cable routed underground fails due to submergence.''
The petitioners further state that ``[t]he TMI accident and
laboratory testing have shown that moisture/submergence of electrical
cables and wires significantly increase the probability of failure.
Failure of the cables and wires also causes failure of connected
components[.]'' The petitioners assert that ``NRC requirements only
state that safety systems should remain functional and do not provide
conditions or acceptance criteria for degraded cables. Additionally,
cable degradation as an ongoing process is not a reported issue unless
it leads to the failure of a cable system or it is discovered that the
cables are operating in conditions for which they were not intended.''
The NRC issued two Information Notices regarding submerged electrical
cables, Information Notice 2002-12, ``Submerged Safety-Related
Electrical Cables,'' (ADAMS Accession Number ML020790238) and
Information Notice 2010-26, ``Submerged Electrical Cables,'' (ADAMS
Accession Number ML102800456). The petitioners stated that the NRC did
not request specific action from the licensees. The petitioners further
state that ``[t]he observations in [Information Notice] 2010-26 range
from licensee failures to establish preventative maintenance and test
programs or their failure to verify and maintain suitable environments
for series of electrical cable systems. In certain cases, the
inspections discovered that a number of cable systems were being
subjected to conditions for which they were not designed for, such as
`continuous underwater environments,' which led to concerning levels of
insulation degradation and cable failure. These affected cable systems
included safety-related power cables, where the inspectors noted that
failures in these systems could disable important accident mitigation
systems.''
In Staff Requirements Memorandum (SRM) for SECY-92-223,
``Resolution of Deviations Identified During the Systematic Evaluation
Program,'' (ADAMS Accession Number ML003763736), dated September 18,
1992, the Commission provided direction to its staff regarding the
applicability of the GDC. The petitioners state that ``[t]he problem is
that past NRC decisions have constrained or eliminated the
applicability of these regulatory requirements'' and ``the Commission
has determined that these requirements are NOT to be applied to the
majority of reactors.'' The petitioners further state that ``[t]he
regulation did not further limit this requirement to where the cables
and wires were located.'' The petitioners assert that a statement by
Judge Ann Marshall Young ``further expounds on the need for rulemaking
and clarification of 10 C.F.R Sec. 50.49 to address cables that may be
exposed to harsh environments during normal, abnormal, and accident
conditions. Electrical cables and wires are prone to accelerated
failure rates when submerged in water or exposed to high humidity
unless designed and qualified for these environmental conditions. The
NRC's regulatory requirements address environmental qualification of
safety-related systems, structures, and components, including electric
cables and wires.''
The petitioners state that ``[t]his rulemaking will supplement and
clarify NRC's regulatory requirements to ensure that safety-related
electrical cables and wires will be properly qualified for all the
environmental conditions they may experience during routine operation
and following accidents regardless of when a reactor received its
construction permit or where the safety-related cable is located.''
Dated at Rockville, Maryland, this 21st day of September 2012.
For the Nuclear Regulatory Commission.
Annette L. Vietti-Cook,
Secretary of the Commission.
[FR Doc. 2012-23792 Filed 9-26-12; 8:45 am]
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