ML19256D054
| ML19256D054 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/11/1975 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Hoineman R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910160778 | |
| Download: ML19256D054 (3) | |
Text
t \\ low
^
U.wiso sy, gg I
LEAR REGULATORY C O..17.ilS.
.J W ASHirJ G ton, o.
C.
20555 J
Rob 0rt E. Heineman, Director, Division of Technical Revicu TECINICAL ASSISTA';CE REQUEST NO. ORB-4 -32 Your assistance is requested in the following:
gyy PLANT NA"E: Three Mile Island Unit 1 (TMI 1)
. ~ _ _. _ _,,
DOCKET NO. :
50-28,9,-
RESPONSIBLE BRANCil: Operating Reactors Branch #4(ORB 4)
CONTACT:
D. N. Bridges Phone:
27435 TECINICAL REVIEh* ERANCilES: Auxiliary and Power Conversion Systems Branch TARGET C0"PLETION DAT2:
January 1, 1976 DESCilIPTION OF REQUEST: The Metropolitan Edison Company (Met Ed) has discovered that the fire detectors (UV type) installed in the Air Intake Tunnel Fire Protection System at TMI-l were not the detectors specified in the FSAR.
The TMI-l analysis indicates that the presently installed detectors are adequate. Met Ed has requested that the bases for the Technical Specifications bc =cdified to be concictent *'ith the presently installed UV detectors.
Enclosed is the Met Ed request along with existing and proposed Technical Specifications and a report (Non-routine Report 75-05) on the installed detectors.
Please provide us with a written evaluation of the proposed Technical Specification change.
)
n ususnjuh Robert W. Reid, Chief Operating Reactors Branch Division of Reactor Licensing i
RWReid cc: DBridges.
KRGoller DEisenhut TJCarter Auxiliary and Power Conversion Systems Branch RIngram
[
ORB 4 ORB 4 Rb6T 1446 062 Bridges /BK 12/it /75 12////75 N9101 n o 778
l m
gin I!!TAKE TUNI!EL FIRE pR rECTION SYSTE.*G
..,M 11 ty_
- ~ ~ -
,es to the fire protection systems protecting the air intake tunnel.
3 cetive
- o provide fire protection syste=s to prevent fire or explosive hydrocarbon vapors entering the control building through the ait intake tunnel.
Seccification 5 5.1 An acceleremeter is attached to the air intake structure to detect its displace ent.
5 5.2 Photocells (ultraviolet'dc.tectors) and Explosion Pressure detectors (static) are previded throughout the three air tunnel zer.es to indicate alarms in the control rocn, stop fans and close dampers at the air tunnel entrance to the control building, and actuate the Halen syste=
in the affected zone or enes of the air intake tunnel.
On the cperation of any Halon system, all three vater delu6e systems are autenatically operated.
5.5.3 Temperature. detectors (rate compensatinc cetuated) are provided through-cut the three to:.cs of the air intake tunnel to indicate alarms in the centrol room, stop fans and elece dampers at the air tunnel entrance to the control building, actuate the water deluge system in each of the three zones of the air intake tunnel.
5.5.h s6oke and cc bustible varer detectors are provided to indicate alarns in the control roca, stop fans, and cicsc dampers.
5.5.5 Remote manual actuation stations are provided in the control room to stop fans, and close dampers at the air tunnel entrance to the control building and to actuate individual water deluge systems.
Bases All fire protection systems are designed to extinguish or suppress an explosion from a vapor-air mixture.
Halon systen discharge extinguisher electrical data:
minimum firing current 1.0 amp, recommended firing current 5.0 amp.
Operation:
hydrostatic pressure is created by the explosive actuator rupturing the burst disc along pre-secred lines.
Effective agent discharge is ec=pleted within 600 tilliseconds.
T Water deluge systems are designed to give a 0 3 gpt./sq. ft. discharge throuchout the air intake tunnel.
Operation when surrounding air reaches set point of 190 F.
P00RORGlNn
~
m 6 oss 5-8
-m fotocell. detectors-Ope:_.'icn:
Normally open gace cird
, closes when 33rivielet radiation from a flame or are is present within the detector cone of vision.
Performance:
Spectral P.esponse 1900-2900 Angstren Units.
Sensit '.vity :
the' detector will respond to a propane-air flame 1.75 in;hes high within 15 =illiseconds at 14.7 psia at a distance of eight inches frc:
the flame source.
Cone of Vision:
120 de6rees.' Explosive Pressure Eetectors (static) Cperation:
!;0rmally open contact close when pressure setting is exceeded.
Setting:
0-5 psi; field adjustable.
Te perature detectors:
Operation - vhen surrounding air reaches the alarm set point.
Setting:
190 F.
S=che and Vapor det,ectors:
Operation -
Ionization type which functions when surrounding air reaches the alar = set point.
?00R BRGINAL o
e f
5-9