[Federal Register Volume 62, Number 114 (Friday, June 13, 1997)]
[Notices]
[Pages 32386-32387]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-15516]
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NUCLEAR REGULATORY COMMISSION
[Docket No. 50-271]
In the Matter of Vermont Yankee Nuclear Power Corporation;
(Vermont Yankee Nuclear Power Station) )
Exemption
The Vermont Yankee Nuclear Power Corporation (the licensee) is the
holder of Facility Operating License No. DPR-28, which authorizes
operation of the Vermont Yankee Nuclear Power Station (the facility) at
power levels no greater than 1593 megawatts thermal. The facility is a
single-unit boiling-water
[[Page 32387]]
reactor located at the licensee's site in Windham County, Vermont.
The License provides, among other things, that the Vermont Yankee
Nuclear Power Station is subject to all rules, regulations, and orders
of the Nuclear Regulatory Commission (the Commission) now or hereafter
in effect.
II.
On November 19, 1980, the Commission published a revised Section 10
CFR 50.48 and a new Appendix R to 10 CFR Part 50 regarding fire
protection features of nuclear power plants. The revised Section 50.48
and Appendix R became effective on February 17, 1981. Section III of
Appendix R contains 15 subsections, lettered A through O, each of which
specifies requirements for a particular aspect of the fire protection
features at a nuclear power plant. Subsection III.G is the subject of
the licensee's exemption request. Paragraph III.G.2.c of Section III.G,
``Fire Protection of Safe Shutdown Capability,'' of Appendix R to 10
CFR part 50, requires the following:
Enclosure of cable and equipment and associated non-safety circuits
of one redundant train in a fire barrier having a 1-hour fire rating.
In addition, fire detectors and an automatic fire suppression system
shall be installed in the fire area.
The licensee requested an exemption from these requirements to
allow the use of fire-resistant cables in the cable vault instead of
enclosing the cables in fire barriers having a 1-hour fire resistance
rating. An exemption is needed because the Firezone R cables do not
meet the literal requirements of the regulation. Installation of fire
detectors and an automatic fire suppression system is not part of this
exemption.
III.
By letter dated May 28, 1996, as supplemented by letters dated July
26 and November 15, 1996, the licensee requested an exemption from
Section III.G of Appendix R. In particular, the licensee requested an
exemption from the requirements of Section III.G.2.c to allow the use
of fire-resistant cables instead of enclosing the cables in fire
barriers having a 1-hour fire resistance rating. The licensee proposed
to use Rockbestos Firezone R Appendix R fireproof cable to control
equipment that is necessary to ensure cooling of the corner room of the
Reactor Building in the event of a fire in the cable vault. The cables
of concern consist of four stainless steel steathed cables. The
Rockbestos Firezone R Appendix R fireproof cable has been tested by
Underwriters Laboratories (UL) Inc., in order to provide data on the
electrical characteristics of the fire resistant cable under controlled
fire exposure conditions and during an extended cool down period. The
staff concluded that the cables as they were installed were bounded by
the UL fire test, used to justify the 1-hour rating of the cables.
Based on the automatic detection and suppression systems provided for
the area, and fire brigade response for manual fire fighting
activities, there is reasonable assurance that postulated fires in the
Cable Vault would be detected, controlled, and extinguished prior to
temperatures rising to a level that could challenge structural support
capabilities of the fire resistant cables, cable tray network, and
overhead conduit. Following from the discussion above, and on the bases
of the same cable construction for the tested and installed cables, the
test results for the Firezone R cable as contained in the UL report,
and the installed and tested configurations for the cables, the staff
concludes that the installed Firezone R cables provide an equivalent
electrical functionality as would be provided by enclosing cables in a
1-hour fire rated barrier in the licensee's specific application. On
the basis of the staff's review of the information provided by the
licensee, the staff has concluded that the Firezone R cables proposed
by the licensee will remain functional during postulated fires at
Vermont Yankee and, therefore, postulated fires would not prevent plant
operators from achieving and maintaining safe shutdown. The staff
concluded, therefore, that the use of the Firezone R cables at Vermont
Yankee in lieu of a 1-hour fire-rated barrier satisfies the underlying
purpose of Section III.G.2.c of Appendix R to 10 CFR Part 50.
Therefore, the licensee's request for exemption from Section III.G.2.c
of Appendix R to 10 CFR part 50 should be granted.
IV.
Pursuant to 10 CFR 50.12(a)(2), the Commission will not consider
granting an exemption except under special circumstances. Under
subsection (a)(2)(ii), special circumstances are present whenever
application of the subject regulation in the particular circumstances
would not serve the underlying purpose of the rule or is not necessary
to achieve the underlying purpose of the rule.
The underlying purpose of Section III.G of Appendix R is to
establish fire protection features such that the plant will maintain
the ability to perform safe shutdown functions in the event of a fire.
The staff has reviewed the proposed alternative and has concluded, as
previously described, that use of Firezone R cables in lieu of a 1-hour
fire-rated barrier ensures that one train of systems that is necessary
to achieve and maintain hot shutdown is free of fire damage. Therefore,
the staff concludes that special circumstances exist for the licensee's
requested exemption in that imposition of the literal requirements of
the regulation in these particular circumstances is not necessary to
achieve the underlying purpose of Appendix R to 10 CFR part 50.
Accordingly, the Commission has determined that pursuant to 10 CFR
50.12(a)(2)(ii), special circumstances exist in that use of Firezone R
cables in lieu of a 1-hour fire-rated barrier in the cable vault
satisfies the underlying purpose of Appendix R to 10 CFR part 50.
Further, the staff has concluded that the requested exemption is
authorized by law, will not present an undue risk to public health and
safety, and is consistent with the common defense and security.
Therefore, the Commission hereby grants the exemption request from the
requirements of Section III.G of Appendix R to 10 CFR Part 50 described
in Section III above.
Pursuant to 10 CFR 51.32, the Commission has determined that the
issuance of this exemption will have no significant impact on the
quality of the human environment (62 FR 30357).
This exemption is effective upon issuance.
Dated at Rockville, Maryland, this 9th day of June 1997.
For the Nuclear Reactor Regulation.
Samuel J. Collins,
Director, Office of Nuclear Reactor Regulation.
[FR Doc. 97-15516 Filed 6-12-97; 8:45 am]
BILLING CODE 7590-01-P
