ML20210B548
| ML20210B548 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/28/1987 |
| From: | Julie Ward SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20210B553 | List: |
| References | |
| TASK-2.K.3.05, TASK-TM GL-86-05, GL-86-5, JEW-87-491, NUDOCS 8705050354 | |
| Download: ML20210B548 (16) | |
Text
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SACRAMENTO MUNICIPAL UTluTY DISTRICT C 6201 S Street. P.O. Box 15830 Sacramento CA 95852 1830,1916)452 3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA APR 2 81987 JEW 87-491 Director of Nuclear Reactor Regulation Attn:
Frank J. Miraglia, Jr.
Division of PWR Licensing-B U. S. Nuclear Regulatory Commission Washington, D. C.
20555 IMPLEMENTATION OF TMI ACTION ITEM II.K.3.5
" AUTOMATIC TRIP OF REACTOR COOLANT PUMPS" GENERIC LETTER NO. 86-05 The District endorses the Babcock & Wilcox Owners Group (BWOG) methodology for reactor coolant pump trip as described in Generic Letter 86-05.
Attached is the District's response to the request for information contained in Section IV of that letter.
If you have any questions, please contact Mr. Robert Little at (209) 333-2935, x4477.
Sincerely, John E. Ward Deputy General Manager, Nuclear cc:
G. Kalman, NRC, Bethesda A. D'Angelo, NRC, Rancho Seco Attachments W
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RANCHO SECO NUCLEAR GENERATING STATION O 14440 Twin Cities Road, Herald, CA 95638-9799;(209) 333 2935 A
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- RESPONSE TO GENERIC ~ LETTER 86-05
.A.
Determination of RCP Trip Criteria 1.
Identify the instrumentation.to be used to determine the RCP trip h
setpoint, including the degree of redundancy of each parameter signal needed for the criterion chosen.
1
Response
r The instrumentation'used to determine when to trip the RCP's are the j
instruments used to determine subcooling margin. Adequate subcooling margin can be determined using redundant (two channels) SPDS displays showing the variable subcooling margin curve and redundant Subcooling-Margin Monitors (SMM).
2.
Identify the instrumentation uncertainties for both normal and adverse-containment conditions. Describe the basis for the selection of the adverse containment parameters. Address, as appropriate, local conditions such as fluid jets or pipe whip which might influence the instrumentation reliability.
Response
The calculated uncertainties of the instrument strings (pressure &
temperature) used to display subcooling margin are:
SPDS Normal Adverse Pressure 1 59 psig i 301 psig i
Temperature i 12 'F i 12 'F i
l SMM l
Pressure 1 46 psia 1 270 psia l
Temperature 1 6 'F 1
6 'F The uncertainties with the subcooling margin indication vary due to the slope of the saturation curve.
The uncertainties are lower at-higher temperature and pressure.
The variable subcooling margin curve on the SPDS displays is based on these uncertainties and is offset i
from the saturation curve by approximately 20*F at the upper end and i
50*F at the lower end.
The 50'F of subcooling' margin limit for the SMM is also based on these uncertainties.
1 The adverse containment condition pressure uncertainty values are based l
on the pressure transmitter manufacturers' specificationlof accuracy for in containment use following a design basis LOCA.
This is very conservative because in the time frame that operator action is required to trip the RCP's on loss of subcooling the transmitters will not have
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been impacted to the degree expected later.in the LOCA scenario.
Increased containment temperature, pressure and humidity will not i
influence the temperature uncertainty as the RTD's have explosive-proof sealable connection heads tested to 60 psig.
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- Pipt whip and fluid jets will nst Effcct.th3 prcssure transmittcrs as thsy aro lecct d cutsido the seccndary shield wall.
Each SMM display 4
receives-input from two RlD's which have sealable connection heads.
The highest temperature value is normally used and if one RTD is lost to pipe whip the other-is used.
I 3.
In addressing the selection of the criterion,~ consideration of uncertainties associated with the BWOG or plant specific supplied analyses values must be provided.
These uncertainties include both uncertainties in the computer program results and uncertainties resulting from plant specific-features not representative of the BWOG generic data group.
Response
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l The B&W analysis summarized in " Analytical Justification for the j-Treatment of Reactor Coolant Pumps during Accident Conditions" i
(Reference 1 of Generic _ Letter 86-05's' Safety Evaluation) is inherently conservative; therefore, it can be concluded that the results represent a conservative estimate of plant behavior. Due to the built-in conservatisms, we hold that the final numbers-represent worst-case values and actual transients will be less severe.
This is typical of i
all safety related calculations, so that determination of calculation i
uncertainties are not necessary or meaningful. The generic model used in the BWOG analysis'has been reviewed to ensure it envelopes Rancho Seco specifics, and since it does, it is concluded that its results represent worst case behavior.
j B.
Potential Reactor Coolant Pump Problems 1.
Assure that containment isolation, including inadvertent isolation, I
will not cause problems if it occurs for'non-LOCA transients'and accidents.
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1 a.
Demonstrate that if water services needed for RCP operations are terminated, then they can be restored fast enough to prevent seal-j damage or failure once a non-LOCA situation is confirmed, t
b.
Confirm that containment isolation with continued pump operation l
will not lead to seal or pump damage or failure.
Response
The Component Cooling Water (CCW) supply to the RCPs is not isolated by a Safety features Actuation.
In addition, the motor operated valves
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are diesel generator backed, and the air operated valves will have two new backups before plant restart.
Thus, upon loss of off-site power or loss of instrument air, the CCW will be maintained.
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A Safety features Actuation will result in isolation of the'RCP Seal
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Return line but not the RCP Seal Injection line.
Plant Operating.
Procedure A.2, " Reactor Coolant Pump System", section 7.0 addresses
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loss of seal injection flow. RCP operation is allowed to continue provided CCW is available and provided temperature and leakage in the seal injection chamber meet specified limits.
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t Thus vital water services for RCP operaticn are n3t terainsted by a Safety Features Actuttion.. Prcc;dures already_in place are adequate i
to. deal with interruption of seal return flow without damage to the pumps or. seals.
2.'
Identify the components required to_ trip the RCPs, including relays, power supplies and breakers.. Assure that RCP trip, when determined to be necessary, will occur.
If necessary, as a result of the location of-
~any critical component, include the effects of adverse containment conditions on RCP trip reliability. Describe the basis for the adverse
{-
containment parameters selected.
Response
i The electrical components which are required to trip the RCP circuit' breakers are listed in attachments 1 through-4. and those which are required to trip the incoming supply, feeder circuit breakers to the l
6.9 kV busses which supply power to the RCPs are' listed in attachments i
5 and 6. lists the electrical equipment which is required
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to provide 125V de control power to the above circuit breakers. These 3
attachments cover information on identification, function, location and reference drrwing no. for each component and piece of equipment.
i shows a simplified electrical single line diagram for.the I
125V de system which supplies control power to the above circuit breakers. Attachments 9 and 10 are the electrical elementary diagrams for the RCP P-210A. Electrical elementary diagrams for RCPs P-2108, l
P-210C and P-2100 are typical of that for RCP P-210A.
The RCPs can be tripped manually from two separate locations via the Control Room and the 6.9 kV switchgear.
The preferred location of tripping the RCPs is from the Control Room.
This can be done by activating a Roto-Tellite backlighted pushbutton control switch, located on the Primary System Panel (H2PS). This j
switch is manufactured by Master Specialty and is of the same type as i
one used in class 1E applications at Rancho Seco.
Pressing this control switch (BLP82) energizes a tripping relay which, in turn, opens the associated RCP circuit breaker.
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The reactor coolant pumps can also be tripped from the Control Room by
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opening the incoming supply feeder circuit breakers to busses S6A and S68.
By pressing the appropriate Ruto-Tellite backlighted pushbutton j
control switch, located on panel H2ES, the associated incoming feeder circuit breaker can be opened to de-energize the associated bus, thus j
turning off power to both the RCPs connected to that bus.
Reactor i
coolant pumps P-210A and P-210C are powered from bus S6A, and reactor j
coolant pumps P-2108 and P-2100 are powered from bus S68.
I The reactor coolant pumps can alternatively be tripped locally from the 6.9 kV switchgear 56A and S68, located in the Auxiliary Building.
Switchgear S6A and S6B are type 7.5 HK-500 metal-clad switchgear j
manufactured by I-T-E Imperial Corporation. This can be done by turning a General Electric type SBN control switch to the "off" 1
1 1
p;sition, which cn:rgiz:s a tripping relay which in turn cp:ns the asscciatcd RCP circuit bretkor. Sitilar SBN type c ntrol switches are utilized in class 1E applications at Rancho Seco.
The 6.9 kV bus incoming feeder circuit breaker can also be tripped in the same manner from the switchgear.
The control power for each RCP control circuit is supplied from 125V de distribution bus SOE.
RCPs A and C control circuits are supplied power through 125V de circuit breaker 72-E23 and RCPs B and D control circuits are supplied power through 125V de circuit breaker 72-E24.
The 125V de bus normally receives power from the main battery charger H4BE. Should the main charger fail, the battery (BE) will feed the power to the bus, until the bus is manually transferred over to the stand-by battery charger H4BEF, before the battery gets fully discharged.
In the unlikely event of loss of 125V de control power to the circuit breaker, it can be tripped mechanically at the switchgear, without any control power.
This can be done by pressing a " trip" button located on the circuit breaker panel of both the RCP circuit breakers and incoming supply feed circuit breakers to busses S6A and S68.
The location of all components listed in attachments 1 through 7 are either in the control Room or Auxiliary Building grade and mezzanine levels.
These locations are in a mild environment per Engineering Report No. ERPT-E0187 (Equipment Qualification USER Manual).
It will thus be seen from the above that the RCPs can be reliably tripped manually either from the control room or from the 6.9 kV switchgear, with or without the 125V de control power.
C.
Operator Training and Procedures (RCP Trip)
In response to NRC questions concerning the identification and management of primary system voids, the BWOG response identified potential changes to the ATOG procedures to incorporate proposed detection and management schemes.
l Each licensee should endorse this program as described, and provide an implementation schedule for the revised ATOG.
If a licensee does not endorse the provided proposal, then a suitable alternate proposal must be provided including an implementation schedule.
Response
SMUD endorses the BWOG response to the RCP trip criteria.
1he current Emergency Operating Procedures provide guidance to the operators for detection and control of primary system voids. Training has been conducted by the Rancho Seco Training Department and by Babcock & Wilcox at the simulator. No further schedule is required. _.-_
ATTACHMENT 1 Electrical Components Required to Trip RCP P-210A Circuit Breaker Component Component Component Location SMUD Drawing Identification Function Equipment (Building)
Reference (BLPB2) RCP P-210A START /STOP Manual TRIP of Panel H2PS E-203, Sh. 1 Backlighted Pushbutton Switch RCP P-210A (Control Room)
BKR 52-6A03 (Energize (TR))
(TR) Trip Relay
< Energize (TC) Trip 6.9KV Switchgear Room E-203, Sh. 1 Coil for BKR 52-6A03 (Auxiliary Building)
Grade Level (TC) Trip Coil Energized to 6.9KV Switchgear Room E-203, Sh. 1 De-energize BKR (Auxiliary Building) 52-6A03 Grade Level BKR 62-6A03 Feeder Breaker for 6.9KV Switchgear Room E-203, Sh.1 RCP P-210A (Auxiliary Building)
Grade Level 72-E23 125 Volt DC Control Panel SOE (Auxiliary E-107 Power BKR (Bus 6A)
Building) Mezzanine E-305, Sh. 2 Level E-744, Sh. A RCP P-210A Local ON/0FF BKR Manual Trip RCP 6.9KV Switchgear E-203, Sh. 1 Control Switch for 52-6A03 P-210A at Local (Auxiliary Building) E5.02-12 I
Switchgear S6A03 Grade Level i
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ATTACHMENT 2 r
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Electriedl Com>onents Required to Trip RCP P-210B G1rcuit Breaker D
Component Component Component Location SMUD Drawing e
Identification Function Equipment (Building)
Reference (BLPB2) RCP P-210B START /STOP Manual Trip RCP Panel H2PS (Control E-203, Sh. lA P-2108 (Energize TR)
Room)
Backlighted Pushbutton Switch j BKR 62-6803 b
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(TR) Trip Relay Energize (TC) for 6.9KV Switch bar
E-203, Sh. lA-9 BKR 52-6B03 Room (Auxiliary Building) Grade Level
-(TC) Trip Coil Energized to 6.9KV Switchgear E-203, Sh. lA De-energize BKR Room -( Auxiliary 52-6B03 Building) Grade Level BKR 52-6B03 Feeder Breaker for
'6.9KY Switchgear E-203, Sh. lA RCP P-210B Room-(Auxiliary-Building) Grade Level 72-E24 125 Volt DC Control Panel ~0E (Auxiliary E-107 Power BKR (Bus 68)
Building) Mezzanine E-305, Sh. 2 Level E-744, Sh. A RCP P-2108 - Local ON/0FF BKR Manual Trip RCP.
6.9KV Switchgear E-203, Sh. lA Control Switch for 52-6803 P-2108 at Local Room (Auxiliary E5.02-12 Switchgear S6B03 Building) Grade Level I
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ATTACHHENT 3 Electrical Com)onents Required to Trip RCP P-2100 Circuit Breaker Component Component Component Location ShUD Drawing Identification Function Equipment (Building)
Reference (BLPB2) RCP P-210C START /STOP Manual Trip of RCP Panel H2PS (Control E-203, Sh. 18 Backlighted Pushbutton Switch P-210C (Energize TR)
Room)
BKR 52-6A02 (TR) Trip Relay Energize (TC) for 6.9KV Switchgear E-203, Sh. IB BKR 52-6A02 Room (Auxiliary Building)
(TC) Trip Coil Energized to 6.9KV Switchgear E-203, Sh. 1B De-energize BKR Room (Auxiliary 52-6A02 Building)
BKR 52-6A02 Feeder Breaker for 6.9KV Switchgear E-203, Sh. 18 RCP P-210C Room (Auxiliary Building) 72-E23 125 Volt DC Control Panel SOE E-107 Power BKR (Bus 6A)
(Auxiliary Building) E-305, Sh. 2 Hezzanine Level E-744, Sh. A RCP P-210C - Local ON/0FF BKR Manual Trip RCP 6.9KV Switchgear E-203, Sh.1B 1
Control Switch for BKR 52-6A02 P-210C at Local Room (Auxiliary E5.02-ll Switchgear S6A02 Building) s wW r w* "W w
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ATTACHMENT 4 Electrical Components Required to Trip RCP P-21')D Gircuit Breaker i
,3 Component Component Component Location SHUD Drawing Identification Function Equipment (Building)
Reference i
(BLPB2) RCP P-210D START /STOP Manual Trip RCP Panel H2PS (Control E-203, Sh. 1C 4
Backlighted Pushbutton Switch BKR P-2100 (Energize TR)
Room) 52-6B02 (TR) Trip Relay Energize (TC) for BKR 6.9KV Switchgear E-203, Sh. 1C l
52-6B02 Room'(Auxilia,ry Building)
(TC) Trip Coil Energized' to 6.9KV Switchgear E-203, Sh. 1C De-energize BKR Room (Auxiliary Building) i J
BKR 52-6B02-Feeder Breaker for 6.9KY Switchgear E-203, Sh. 1C RCP P-210D Room (Auxiliary Building) 72-E24 125 Volt DC Control Panel SOE.
E-107 Power BKR (Bus 6B)
(Auxiliary Building) E-305, Sh. 2 Mezzanine Level E-744, Sh. A RCP P-2100 - Local 0N/0FF BKR _
Manual Trip RCP 6.9KV Switchgear E-203, Sh. 1C Control Switch for BKR 52-6B02 P-2100 at Local Room (Auxiliary E5.02-11 jt Switchgear S6B02 Building) l 11.
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ATTACHMENT 5 Electrical Components Required to Trip Incoming Feeder Circuit Breaker 6.9 kV Switchgear 56A Component Component Component Location SMUD Drawing Identification Function Equipment (Builaing)
Reference Bus 6A Panel H2ES (Control E-208, Sh. 2A BLPB2 (Backlighted Pushbutton Manual Trip (TR) to Switch) Trip X86 BKR 52-6A01 (Energize Room)
De-energize BKR 52-6A01 )
(TR) Trip Relay Energize (TC) Trip 6.9KV Switchgear E-208, Sh. 2A Coil for BKR 52-6A01 Room (Auxiliary Building)
(TC) Trip Coil Energized to De-6.9KY Switchgear E-208, Sh. 2A energize BKR 52-6A01 Room (Auxiliary Building) 72-E23 125 Volt DC Control Panel SOE E-107, Power BKR (Auxiliary Building) E-208, Sh. 2A Mezzanine Level BKR 52-6A01 Feeder BKR Bus 6A 6.9KV Switchgear E-208, Sh. 2A.
Room (Auxiliary Building)
Local 0N/0FF BKR Control Switch Manual Trip BKR 6.9KV Switchgear E-208, Sh. 2A Limit Auxiliary Transformer 52-6A01 at Local Room (Auxiliary E5.02-35 No. 1 -X86/52-6A01 Switchgear S6A Building)
BLPB2 (Backlighted Pushbutton Manual Trip Bus 6A Panel H2ES (Control E-208, Sh. 3 Switch) Trip X976 BKR 52-6A04 Via De-energization Room) of BKR 52-6A04 (TR) Trip Relay Energize (TC) for 6.9KV Switchgear E-208, Sh. 3 BKR 52-6A04 Room (Auxiliary Building) 4
i ATTACHMENT 5 (Continued)
Electrical Components Required to Trip Incoming Feeder Circuit-Breaker 6.9 kV Switchgear 56A Component Component Component Location SMUD Drawing Identification Function Equipment (Building)
Reference (TC) Trip Coil Energized to Open 6.9KV Switchgear E-208, Sh. 3 BKR 52-6A04 Room (Auxiliary Building) 72-E23 125 Volt DC Control Panel SOE (Auxiliary E-107 Power BKR Building) Mezzanine E-305, Sh. 2 Level BKR 52-6A04 Feeder BKR Bus 6A 6.9KY Switchgear E-208, Sh. 3 Room (Auxiliary Building)
Local ON/0FF BKR Control Switch, Manual Trip DKR 6.9KV Switchgear E-208,.Sh. 3 Start-up Trans. No.1-X976 52-6A04 at Room (Auxiliary E5.02-8 BKR 52-6A04 Switchgear S6A Building) a y
T ATTACHMENT 6 Electrical Components Required to Trip Incoming Feeder Circuit Breaker 6.9 kV Switchgear 56B 1
Component Component Component Location SMUD Drawing Identification Function
' Equipment (Building)
Reference f
(BLPB2) Backlighted Pushbutton Manual _ Trip Bus 6A Panel H2ES (Control E-208, Sh. 2 Switch Trip X86 BKR 52-6B01 by Energizing (TR)
Room)
E-402, Sh. lA 4
to De-energize BKR 52-6B01 (TR) Trip Relay Energize (TC) for 6.9KV Switchgear E-208, Sh. 2 BKR 52-6B01 Room (Auxiliary-Building)
(TC) Trip Coil Energized to.
6.9KV Switchgear E-208, Sh. 2 j
De-energize BKR Room (Auxiliary j
Building) 72-E24 125 Volt DC Control Panel SOE
' E-107 Power BKR (Auxiliary Building) E-208, Sh.12A:
Mezzanine Level BKR 52-6B01 Feeder BKR Bus _68 6.9KV Switchgear~
E-208, Sh.'2 Room (Auxiliary.
Building)
Local ON/0FF BKR Control Switch, Manual Trip BKR 6.9KV Switchgear E-208, Sh. 2 Unit Auxiliary Transformer 52-6B01 at Local Room (Auxiliary.
E5.02-36 No.1 - X86/52-6B01 Switchgear S6B
. Building)
(BLPB2) Backlighted Pushbutton Manual Trip Bus 6B Panel H2ES (Control:
E-208, Sh. 3A Switch, Trip X976 BKR 52-6B04 Via De-energization Room)
E-402, Sh. lA l
of BKR 52-6804 (TR) Trip Relay Energize'(TC) BKR 6.9KY Switchgear
'E-208, Sh. 3A 52-6804 Room (Auxiliary.
Building)
d ATTACHMENT 6 Electrical Components Required to Trip Incoming Feeder Circuit Breaker 6.9 kV Switchgear 56B P
Component Component Component Location SMUD Drawing Identification Function Equipment (Building)
Reference (TC) Trip ' oil Energized to Open 6.9KV Switchgear E-208, Sh. 3A BKR S2-6B04 Room (Auxiliary Building) 72-E24 125 Volt'DC Control Panel SOE (Auxiliary E-107 Power.BKR
. Building) Mezzanine E-305, Sh. 2 Level BKR 52-6B04 Feeder BKR Bus 6B 6.9KV Switchgear E-208, Sh. 3A Room (Auxiliary Building)
Local ON/0FF BKR Control Switch Manual Trip BKR.
6.9KY Switchgear E-208,:Sh. 3A Start-up Transformer No.1 -
52-6B04 at Switchgear Room (Auxiliary E5.02-7 X976, BKR 52-6B04 S6B Building)
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1 ATTACHMENT 7 Electrical Components of the 125V dc Control Power Source for RCPs P-210A, B, C and D Component Component Component Location SMUD Drawing-Identification Function Equipment (Building)
Reference (BE) Battery 125V DC Battery Bus West 480V Switchgear E-107 SOE Room (Auxiiiary E-744, Sh. 7 Building) Hezzanine Level (H4BE) Master Battery Charger Master Battery West 480V Switchgear E-107 Charger for BE Room (Auxiliary E-744, Sh. 4 Battery
' Building) Mezzanine Level (H4BEF) Alternate Battery Charger Alternate Battery West 480V Switchgear E-107 Charger for BE Room (Auxiliary E-744, Sh. 4-Battery Building) Mezzanine Level (SOE) Non-Yital 125V DC Bus 125V DC Power SOE-Panel E E-107 Distribution Bus (Auxiliary Building) E-305, Sh. 2 E-744, Sh. 4 (S-2A1) Motor Control center 480V AC Power West 480V Switchgear E-744, Sh. A Room (Auxiliary E-744, Sh. 5 Building) Mezzanine Level a
ATTACHMENT 8 72-E23 72-E24 To RCPs A & C Control Circui
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p To RCPs B & D Control Circuits.
125V dc Bus SOE To
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Main Battery Stand-by Charger
~ Battery H4BE.
. Charger O
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125V dc Bat ery
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480 V From n
MCC S2A1 480 V 480 V 4
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OVERSIZE i DOCUMENT PAGE PULLED SEE APERTURE CARDS NUMBER OF OVERSIZE PAGES FILMED ON APERTURE CARDS APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC i
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