ML20039F790
| ML20039F790 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 01/04/1982 |
| From: | Tauber H DETROIT EDISON CO. |
| To: | Kintner L Office of Nuclear Reactor Regulation |
| References | |
| EF2-55-989, NUDOCS 8201130370 | |
| Download: ML20039F790 (4) | |
Text
Q 5' 14r
" a conwuct.on
- EC6fpg n
BT JAN g
Deholt
- a%;'ky, EdisonMiEN=
4 y
oi January 4, 1982 EF2 - 55,989 Mr. L. L. Kintner U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Licensing Washington, D. C. 20555
Dear Mr. Kintner:
Reference:
Enrico Fermi Atomic Power Plant, Unit 2 NRC Docket No. 50-341
Subject:
Submittal of Additional Information l=
On Fire Protection i
In response to your request, the Fermi 2 FSAR Appendix 9B and response to Question 021 32 is being revised as indicated on the attached pages.
The formal submittal will follow in the next FSAR amendment.
Sincerely,
/
Attachment ol c
cc:
B. Little S
/
I
'3 l
8201130370 B20104 PDR ADOCK 05000341 A
EF.2 FSAR i
paper of 95,000,000 Btu. Paper in this category includes paper in file cabinets and shelves, and chart, recorder, terminal, and plotter paper in use at their respective machines.
g b.
Anticipated transient combustibics in the computer room consist of 102,000,000 Btu of paper. The remaining peripheral rooms contain 222,000,000 Btu of paper, wood, and plastic. The transient combustible in the control room is less than 5 cubic feet, or 3,000,000 Btu paper.
Paper note in use will be stored in enclosed metal cabinets.
r' 9B.4.2.10.3 Conclusion
~
~
i i
The objective for this zone is to minimize the potential for the occurrence j
of a fire in this zone and, should a fire occur in the zone, minimize the j
extent of the fire and also to prevent a fire from another zone from spreading into this zone. This objective is achieved through spatial separation of control and instrument components, barriers, and the provision of early warning detection, automatic Halon suppression in the computer room and computer underfloor area, manual hose, and portabie fire extinguishers.
9B.4.2.11 Divisica I and II Battery Rooms, Zone 10, Elevation 643'-6" 9B.4.2.11.2 Description b)
This zone, shown on Drawing 6A721-2407, consists of two rooms.
It is bounded on the north by the control room; on the east and south by Zone 11 of this fire area; and on' the west by the reactor building.
This zone houses the Division I and II engineered safety features batteries.
The walls, floor, and ceiling of this zone are constructed of reinforced Penetrations concrete having a minimum fire resistance rating of three hours.
are sealed to provide three hour rated fire barrieta.
The door openings in 24 the south wall are protected by Class A fire doors.
Ventilation fo'r this zone is provided by the reactor / auxiliary building
~
ventilation system. Supply and exhaust air are ducted separately to and from P'
each room. Each room is provided with redundant exhaust fans.
/
9B.4-43 Amendment I
} {-*
m me -
- ws w -
w' Q'W _ -,, _
CM o.
- ~
90
EF,2-FS AR Tha surfece burning characteristics of the glazed block walls, duct insula-tion, and ceiling panels in the control room area are rated 25 or less in h
accordance with the ASTM E-84 test method. The s:aoke and fuel contribution of the walls, duct. insulation and ceiling panels is also rated 50 or less in accordance with the ISIM E-34 test method.
Ventilation for this zone is provided by the control center air conditioning system.
Conditioned air is ducted directly to and from the control roan and associated offices and facilities.
Shutdown equipcent located in this zone consists of main control board instrumentation, as shown on Drawing 6A721-2407.
Fire detection equipment located in this zone consists of an ionization and photoelectric detection system, ionization detectors within the control boards, and a heat detector in the kitchen. Fire suppression equipment located in this zone consists of an automatic Halon suppression system for the computer room and underfloor area, c:anual hose, and portable fire extinguishers, as shown on Drawings 6A721-2407 and 6A721-2408.
9B.4.2.10.2 Analysis Plant shutdown can be accomplished frcm the control roan or by utilizing the remote shutdown panels located in the Division I switchgear or Division II Switchgear Pccxts. Operating procedures will instruct the operators to operate k
electrical breakers locally if the control room panels or remote shutdown panels are not available.
In8dvertent Perati n f the aut matic H81 n 8uPPression system in the com-39 puter rocu would have no adverse effect on equipment located in this zone.
Smoke removal frun the control room can be accomplished utilizing the control center air conditioning system as described in FSAR Section 9.5.1.2.2.
~
Combustibles located in this zone consist of the following:
a.
Permanently installed combustibles in the computer room consist ot:trrputer wiring insulation and components of 22,000,000 Btu.
In
+
the control ro m, per anently installed combuctibles con ict of wiring insulation and ccxtponents of 112,000,000 Btu and
{
9B.4-42 Amendment T
[_[
e a
EF-2-FSAR need to evacuate this area.
The design basis for such an event is that the control room panel fire would be extinguished before more than one panel could be damaged.
The smoke from such a fire could cause the evacuation of the operating personnel.
To respond to such a scenario, Fermi 2 will have two divisional 38 remote shutdown panels.
l l
~
n Table 1 lists the systems necessary for shutdown and-vital support to achieve hot and cold shutdown from the control room. Table 5 lists the instrumentation and manual equipment control provided on the remote shutdown panels, i
A control panel fire will leave one of the redundant divi-sions intact; therefore, credit is taken for the automatic operation of equipment in the functional division. The Division I remote shutdown panel is provided to meet i
General Design Criterion (GDC) 19; it has equipment for achieving hot and cold shutdown. Although cold shutdown can be achieved from this panel, the control room habit-ability would be reestablished before the need to go to cold shutdown. The Division II remote shutdown panel will include the instruments and controls necessary to perform the manual operating functions to achieve hot shutdown.
The instrumentation provided on these panels is wired such that the circuits are independent of the control room area.
4 Fermi 2 is providing the remote shutdown capability to achieve lT shutdown in the event of a fire affecting any control room operating panel. Cable entry to the control room panels is tottom-fed from the cable spreading room.
5.
In response to question 5 of Item 021.32, Edison yg provides the following information:
a.
Table 6 lists the motor-operated divisional valves for the high-pressure / low-pressure interfaces on the residual heat removal (RHR) system, b.
The cold shutdown power and control cables for these valves were included in the overall analysis, as listed in Table 2.
c.
Conduit and cable tray interactions are shown in the drawings enclosed with Detroit Edison's letter EF2-53,899, June 29, 1981, from W.
F. Colbert (Edison) to L. L. Kintner (NRC).
d.
Check valves are provided to mitigate the possi-bility of an intersystem loss-of-coolant accident (LOCA) for all pressure interfaces except the recirculation system suction line (Ell-F608, -F009,
-F008).
Valves Ell-F009 and -F608 are inside pri-
)
mary containment; Ell-F008 is outside containment.
E.5.021-61 Amendment ' At
_.