[Federal Register Volume 59, Number 122 (Monday, June 27, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-15485]
[[Page Unknown]]
[Federal Register: June 27, 1994]
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NUCLEAR REGULATORY COMMISSION
[Docket Nos. 50-272 and 50-311]
Public Service Electric and Gas Co.; Correction
On July 27, 1989 (54 FR 31270) was published in the Federal
Register which contained exemptions to 10 CFR part 50, appendix R,
related to the Salem Nuclear Generating Station, Units 1 and 2. The
following corrections should be incorporated:
1. Page 31271, Column 1, Line 53, change ``1 & 2'' to ``12''.
2. Page 31271, Column 2, replace Line 3 through Line 32 with the
following:
``The rooms within this area are separated by hollow core metal
office partitions except the air conditioning rooms, which are
separated by a reinforced concrete wall. The two control rooms are
separated by a 10-foot wide corridor. Room partitions between the
control rooms and the senior shift and shift supervisor's office
contain glass panels. The control rooms are separated from their
associated control equipment rooms by built-in steel frame control
cabinets. Dropped ceilings are finished with acoustic tile.''
3. Page 31272, Column 1, Line 5, change ``1006'' to ``100G''.
4. Page 31272, Column 2, Line 35, change ``781'' to ``78I''.
5. Page 31272, replace Column 2, Line 37 to Column 3, Line 44, with
the following:
``4.1 Exemption Requested
An exemption was requested from Section III.G.2.c to the extent
that it requires the separation of redundant cables and equipment by
hour rated fire barriers plus area-wide suppression and detection.
Specifically, these locations are not protected by automatic fire
suppression system or area-wide fire detection systems.
4.2 Discussion
This fire area consists of the mechanical penetration areas on
elevations 78 feet and 100 feet of the auxiliary building. It is
constructed of reinforced concrete with 3-hour fire rated barriers.
Doors, dampers, and HVAC duct penetrations are not 3-hour rated;
however, these are the subject of a generic exemption previously
evaluated to be acceptable.
Elevation 100 ft contains the fuel handling area exhaust
ventilation equipment and the containment pressure relief exhaust unit
and the steam generator blowdown tanks. The area also contains some
safety-related instrument panels. Elevation 78 ft. contains piping for
various systems which run between the auxiliary and the containment
building. The area also contains service water piping which enters the
auxiliary building from the service water intake structure. Partial
area fire detection is provided for the protection of the major fire
hazards on elevations 78 ft. and 100 ft. Continuous thermal strip
detectors are also provided to protect charcoal filters in the
ventilation units. Additionally, automatic fire suppression is provided
in the ventilation units by a water deluge spray system actuated by the
thermal strip detectors. Portable fire extinguishers and manual hose
stations are also provided on elevation 100 ft.
The redundant equipment located in this area includes piping and
valves associated with the following systems:
--Auxiliary Feedwater
--Component Cooling
--Charging System
--Containment Ventilation
--Service Water
--Residual Heat Removal
--Main Steam
4.3 Evaluation
The fire protection in this area does not comply with the technical
requirements of Section III.G.2.c of Appendix R because the redundant
cables are protected by a 1-hour rated barrier but, without automatic
suppression and area-wide detection.
There was a concern that a fire in this fire area could cause the
loss of normal shutdown capability. The in-site combustibles in the
Mechanical Penetration area will result in a total fire load of
approximately 28,000 BTU/ft2 (21 minutes on the ASTM time-
temperature curve). The major combustibles in this area consist of the
charcoal filters and electrical cable insulation. The charcoal filters
are protected by automatic deluge suppression systems. The electrical
cables are widely dispersed and protected by the partial detection
system. There is a reasonable assurance that a fire in this area will
be detected by the partial fire detection system in its early stages
and extinguished by the fixed fire suppression system or the fire
brigade before adjacent safety-related areas are threatened. The 1-hour
fire barriers would maintain one division of cables needed for safe
shutdown free of fire damage until the fire brigade could extinguish
the fire.
4.4 Conclusion
Based on the above evaluation, it is concluded that the existing
fire protection features already in place combined with the 1-hour fire
barriers in the above described fire areas provide a level of fire
protection equivalent to the technical requirements of Section
III.G.2.c of Appendix R. Therefore, the exemption is granted.''
6. Page 31275, Column 1, Line 8, change ``Panel 35'' to ``Panel
355''.
7. Page 31275, Column 3, Line 67, change ``1&2 FA-AB-122A'' to ``12
FA-AB-122A''.
8. Page 31276, Column 1, Line 16, change ``781'' to ``78I''.
9. Page 31276, Column 1, replace Lines 18 through 24 with the
following:
``7. Lack of complete 1-hour fire rated barriers between redundant
shutdown systems in the 460V switchgear room. (Areas 1&2 FA-AB-84A)
(Licensee Exemption 6);''
10. Page 31276, Column 1, replace Lines 30 through 33 with the
following:
``9. Lack of complete 1-hour fire rated barriers between redundant
shutdown system and a manually actuated fire suppression system in lieu
of an automatic system in the 4160V switchgear room (Areas 1&2 FA-AB-
64A) (Licensee Exemption 9);''
11. Page 31276, Column 1, Line 46, change ``45A'' to ``45A and B''.
Dated this day at Rockville, Maryland, this 17th day of June,
1994.
For the Nuclear Regulatory Commission.
Charles L. Miller,
Director, Project Directorate I-2 Division of Reactor Projects--I/II
Office of Nuclear Reactor Regulation.
[FR Doc. 94-15485 Filed 6-24-94; 8:45 am]
BILLING CODE 7590-01-M