ML20237E244
| ML20237E244 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/21/1987 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| GN-1420, NUDOCS 8712280231 | |
| Download: ML20237E244 (4) | |
Text
_-__-_
. Georgia Power Company Post Office Box 282 Waynesboro, Georgia 30830 Telephone 404 554-9%1 404 724-8114 Southern Company Services, Inc.
Post Office Box 262s Bnmingham, Alabama 35202 Telephone 205 870 6011 VOgtle Project December 21, 1987
)
U. S. Nuclear Regulatory Commission File:
X7BC35 ATTN:
Document Control Desk Log: GN-1420 Washington, D. C.
20555 NRC DOCKET NUMBER 50-425 CONSTRUCTION PERMIT NUMBER CPPR-109 V0GTLE ELECTRIC GENERATING PLANT - UNIT 2 REMOVAL OF CONTROL ROOM TEMPORARY GYPSUM BOARD FIRE WALL Gentlemen:
Unit 1 is protected from the fire hazards associated with Unit 2 construction activities through the existence of fire barriers, administrative
- controls, and fire protection capability in conformance with the guidelines defined by Branch Technical Position (BTP) CMEB 9.5-1. Section C.1.e(3).
For the period of Unit 1 operation and Unit 2 construction, the Unit 1 and Unit 2 control rooms are separated by two temporary I
walls, a steel wall on the Unit I side and a gypsum board fire wall on the Unit 2 side.
The steel wall acts as a bullet-proof security boundary as well as a pressure boundary to maintain the positive pressure requi rements within the Unit I control room relative to the adjacent areas.
The gypsum board wall acts as a three-hour fire barrier between the two control rooms.
A continuous fire watch has been established in the Unit 2 main control room area (includes back panel locations) until the structural steel members required to support the control room ceiling fire barrier (comnon to the Unit I and 2 control rooms) are fire proofed.
In order to facilitate the completion of the Unit 2 control room, i.e.,
suspended ceiling installation and interconnection of HVAC ducts, the temporary vertical fire barrier must be removed.
In addition,' barrier removal at this time will preclude the possibility of a major schedule impact resulting from additional dust that could occur from the removal of 5 layers of gypsum board.
The bullet-proof steel security barrier will -remain in place until immediately prior to the Unit 2 control room area being placed gl ~ '
under the administrative control of GPC Nuclear Operations.
A temporary platform constructed of wood planks has been installed as shown on the sketch to ' accommodate' ceiling installation and protect the benchboards from overhead activities.
All other L
untreated wood scaffolding and platforms ' will be removed prior pW to the removal of the three-hour rated vertical barrier.
The 0
remaining platform is currently scheduled to be removed by June
\\(
1, 1988, prior to the removal of the security barrier wall.
8712280231 871221 4
PDR ADOCK 0500042eg F
J q
File:
X7BC35 Log:
GN-1420 December 21, 1987 Page two If. additional scaffolding is required for construction activities, it will be constructed of fire retardant lumber, limited to an individual size of 72 sq. ft. and arranged such that hose stream discharge from the floor can still effectively reach the area above.
While the bullet-proof steel security barrier does not qualify as a rated three-hour fire barrier, it does present an obstruction to the propagation of flames should a fire occur.
l The features listed below, in addition to the non-combustible.
security barrier, will preclude the remaining Unit 2 control room construction activities from compromising the safety of the Unit I control room. These features are:
The structural steel required to support the fire barrier ceiling common to the Unit I and 2 control rooms is protected with fire proofing.
Except for the area crosshatched on - the - attached sketch, any wood brought into the Unit 2. control room area will. be fire retardant.
Each additional wood scaffolding will be limited to 72 square feet.
A continuous fire watch will be in place until all untreated wood is removed.
l Nuclear Operations personnel are presently working in the Unit 2 control room 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> a day which increases the probability of early detection of a fire.
l l
Approximately 10 portable. fire extinguishers (ABC rated) are in the room.
Immediately adjacent to the control room entrance is a fire hose cabinet with 150 feet of hose (3-50. ft. lengths) capable of spraying all areas.
Sufficient pressure is available to compensate for the additional -hose length.
The bullet-proof steel security barrier will keep water spray from damaging any components in the Unit I control room.
Because of ~ the positive pressure requirements on the Unit I control room and the. seals necessary to achieve that. pressure, the propagation of smoke from the Unit 2 control room to the Unit I control room is unlikely.
t File:
X7BC35 Log:
GN-1420 December 21, 1987 Page three During the Unit 1 control room pressurization test, sealing for air leaks was performed from the Unit I side, i.e.,
the steel wall side.
Additionally, the gypsum board wall has numerous penetrations for seismic support of the pressure / security barrier which were closed only with mineral wool fiber and are not a i r-tight.
Thus, although the gypsum board wall was installed at the time of the pressurization test, we believe it did not contribute to the effectiveness of the pressure boundary of the Unit I control room.
This will be verified after the gypsum board wall is removed.
Therefore, removal of the gypsum board wall will have no impact on the pressure boundary, the maintenance of the positive pressure requirements in the Unit I control room with respect to adjacent areas or Unit I control room habitability.
The schedule for removing the gypsum board fire wall is early January 1988.
Therefore, should your staff have any concerns with the above actions, please contact us as soon as possible.
Sincerely,
.h Y J. A. Bailey Project Licensing Manager JAB /wkl Attachment xc: NRC Regional Administrator NRC Resident inspector I
J. P. O'Reilly P. D. Rice L. T. Gucwa R. A. Thomas J. E. Joiner, Esquire J. Hopkins (2)
G. Bockhold, Jr.
R. Goddard, Esquire R. W. McManus Vogtle Project File l
ll l
i 4
I N
I M
I I
1 I
I OO R
.e o
r L
t f
O T
i I
t R
R x
I T
UC N
ES e
O Y
I I
C RAR RE I
o OI P R I
l MR T
EA I
I T B I
N l
I I
I l
I l
l I
I QU
/
\\
I 1
I
\\
NhNN\\hN NN l
I l
l I
I r
M O
1 O
CR 1
R i
F I
~l Y
L o
O f
R e.
R I
AR r
RE r
T OI I
\\
i N
PRR t
O UA s
a I
C
\\
N I B e
2
'Nu
'y o
T I
N i
UN I
I I
I I
I I
3 c
se_
.vt i,
t e,
_R t
i,R R
rs b
=
'l