ML20128G963

Responds to NRC 850309 Questions 010.32 & 010.33 Re Safe Shutdown & Alternate Shutdown.Responses Will Be Included in Future Amend to FSAR.Marked-up Fire Protection Program Review Sections Encl

ML20128G963
Person / Time
Site:	Comanche Peak
Issue date:	05/21/1985
From:	Beck J TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Nonnan V NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
References
NUDOCS 8505300364
Download: ML20128G963 (14)

Text

- _ _ _ _ _ _

Log # TXX-4478 TEXAS UTILITIES GENERATING COMPANY File # 10010 MKYWAY TOWEN

• 400 NORTH OLIVE MTHEET, L.B. 88

• DALLAM,TEXAM 73301 May 21, 1985 1"*J.!!f Director of Nuclear Reactor Regulation Attention: Mr. Vincent S. Noonan, Director Comanche Peak Project Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION DOCKET N05. 50-445 AND 50-446 RESPONSE FOR REQUEST FOR ADDITIONAL INFORMATION ON SAFE SHUTDOWN AND ALTERNATE SHUTDOWN

Dear Mr. Noonan:

Attachment 1 provides the responses to NRC Auxiliary System Branch Questions 010.32 and 010.33 requested in NRC letter dated March 8, 1985.

These responses will be included in a future amendment to the CPSES FSAR.

Also attached (Attachment 2) are marked up copies of the referenced sections of the CPSES Fire Protection Program Review (FPPR).

Should you have any questions in this matter please contact this office.

Sincerely, Y.

J. W. Beck BSD/grr Attachments c- S. B. Burwell A. L. Vietti Distribution: Original plus 40 copies He feeJ.

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L A usvsMsox or texan (TELETEER ELECTRIC COMPANY

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, , CPSES/FSAR

~

10010.32 ;In~.the-response to 010.26, the app 1icant identified the following high:to low pressure interfaces that require post

, fire operator actions to prevent overpressurizing the systems:

a. Pressurizer Power-0perated Relief Valves

[ ,

b. Normal-Letdown Isolation Valves

c. Excess Letdown Isolation Valves d.': Reactor Head a'nd Pressurizer Vent Valves

'In order to. complete our evaluation, we require a description of the. post fire operator actions that include the priority-of the operator actions, the number of actions, and 'the time allowed for each action. In addition, verify.that these operator actions are listed in the safe shutdown procedures.

~

R010.32- CPSES Safe Shutdown systems are designed to preclude-spurious. operation of high-to-low pressure interface valves. Operator action to prevent these spurious' operations is only required for Cable Spreading Room / Control' Room fire scenarios and is described below.

Table 4-1.4 of the CPSES Fire Protection' Program Review (FPPR) provides'a summary of_ operator actions required at

-the Hot Shutdown Panel (HSP). To prevent spurious operation of.the Train B Pressurizer Power Operated Relief Valve,1-PCV-456, and _ the Excess Letdown Isolation Valve, 1-8153,'the operator, at the HSP, connects the alternate power _ supply path to these valves by transferring control to the Hot Shutdown Panel.

~ Table 4-1.3 of the FPPR provides a summary of operator actions required ~at.the Shutdown Transfer Panel (STP). To u

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t CPSES/FSAR

. prevent spurious operation of the Train A Pressurizer Power Operated Relief Valve,1-PCV-455A, and the Normal Letdown Isolation Valves,1-8149A, 8149B and 1-8149C, the operator,.at the STP, connects the alternate power supply path.to these valves by transferring control to the Hot Shutdown Panel.

Priority of operator actions and the time allowed for each operator action are given in FPPR Figures 4-2 and 4-1,

.respectively.

FPPR Table 4-1.1 provides a summary of operator actions required at various locations throughout the plant. To prevent spurious operation of the Reactor Head and

. Pressurizer Vent Valves, 1-HV-3607, 1-HV-3608, 1-HV-3609 and 1-HV-3610 respectively, the operator disconnects DC power at the 125V DC switchboard in the DC Inverter-Equipment Room, by turning off the DC input to the respective distribution panels.

FPPR Figure 4-3 indicates the priority of these actions and the time allowed.

All operator actions are listed in detail in CPSES procedure ABN 803A,." Response to a Fire Affecting Control Room or Cable Spreading Room".

.,-t j

l

,_ ,_ CPSES/FSAR Q010.33 In order to complete our evaluation, we require the applicant to confirm that acceptable coordination and

-selective-tripping of breaker / fuses is provided for safe ishutdown circuits and the ac and de power systems.

. Q010.33 LThebreakerfusecoordinationstudyisscheduledtobe completed.by 06/15/85. Proper coordination is being assured by verifying that the protective device for the p_ branch circuit has a lower time-current characteristic than the protective device for the common power supply.

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TABLE 4-1.1-TEXAS UTILITIES GENERATING COMPANY COMANCHE PEAK STEAM ELECTRIC STATION

SUMMARY

OF ACTIVITIES'FOR AUXILIARY OPERATOR.1 3 .- -

y ,

BASIS OF ACTIVITV SECilVN l

• COMPONENT.

1 ACTION _ -.._.....Il I. l 1 IPCPX1, 1PCPX2 (1)- - PRE CLUDE LOS% OF SEAL INTEGRilV. l (3) TRIP REACTOR' COOLANT PUMPS AND REMOVE- ,

JUA BREAMER CLOSE FUSES AT SwGH 1A1. IPCPX3 .IPCPX4 1:

I 3A2 143..IA4.

l LOCAL CONTROL (2) M A INT AINS COO' I NG F OR STATIC L OL At. s.V *> T AR T UPS TRAIN A HVAC ROOM l st) PANEL CPX-VAACUP- INVERTERS AND BATTERY CHAkhtRS. l COOLER. 1A I l

tr 1EDI -(3) . DISCONNECT POWER TO CAUSE [

(J) OPEkATE SWITCHES TO DISCONNECT DC POWER 1PV4252 SSW PUMP at HECIRC- l XED1*1 10 STEAM GLNERATOR PORVS. REACTOR VENT VALVE TO FAlt IN 1HE Cl OSf D l -l' j

I SOL AT IuN V At VES. VOLUME CONTROL TANK (SAFE) POh!!!ON.

j' VENT 1504ATION V A L.v E S . PRESSURIZER VENT l 1 ISOLAI!ON VALVLS. 55W PtlMP al RECIRC IVIEC1 REMOVES DC INPUT TO THE'IN- {

1 VALVE, AND CCP al RECIRC VALVE. VERTER. THE INVERTER SUPPtILS .i l

POWER TO 1C5-8220 AND THL I/P l CONVERTERS THAT CONTROL % I PORVS IPV2325 AND IPV23/t.

Wv34,67, lhvSs.de ,t l'

15D1-1 CAUSES RX VfSSEL VENT.lSOLAf!ON l VALVES AND (cps 1 RECIRC VALVE {'

1Fv4536 TO F Alt. IN THE CL OSt p l (SAFE) POSITION, REMOVE S POwf R l f

FROM SG PORV IPV2325 ANO IPV2321 J' LIMIT Sw!TCHES. I REMOVES POWER FROM SG PORV j l e IED2 f j s IED2-1 IPV2326 AND IPV2328 LIMIT (

g. WITCHES. CAUSES PRESSURIltR )

l rwt VALVFS TO Fall IN THE l MFt LOSED (3At t ) PO$ti!ON. l DEENERGIZES THE DC INPUT TO THE l IVIEC2 j

' INVERTER. THE INVERTER SUPPLIES POWER TO 1C5-8221'AND THE t/P l [

CONVERIERS THAT CONTROL 5G l l

PORVS IPV2326 AND IPV2328.

1... _-._..---.l PAGE 1 OF 2 1/ SUM. OF ACTIVITIES /4-1.1 P!74

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TABLE 451.1 TEXAS UTILITIES GENE 1ATING COMPANY-CDMANCHE PEAK STEAM ELECTRIC STATION

SUMMARY

OF ACTIVITIES FOR AUXILIARY OPERATOR 1 REFEREN[I l BASIS OF ACTIVITY SfCTION COMPONENT ACTION ~

I *

(4) DISCONNECT POWER TO ALLOW FOR SWITCH: -l (4) OPEN BREAKERS FOR THE.FOLLOWING ON MOV 1-8111 MANUAL ALIGNMENT CAPABIL11Y l MCC 1EB4-1: MOV 1-88128 OF 1-8111 LHARGING PUMP MINI- .. l n' 1-8111 FLOW ANO 1-HHI?B RWSt.lO RHR j -

l

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o MOV 1-8H128 o TIEC4 PUMP 2. I l

h' TRANSF TIEC4 TRIPPING TIEC4 AT MCC IE84 DEENERGl2ES AC INPUT TO IVIEC2.

.THE INVERTER SUPPLIES POWER 10 I l

' 1CS-8221 AND THE 1/P CONVERTERS l THAT CONTROL SG PORVs IPV2326 l {

l ANO 1Pv232H. i -I l-HS 67tOA (5) PNOVIOES CHILLED WATER TO SAFF (5) AT LOCAL CONTROL PANEL (1CHCICES) START SHUTDOWN EQUIPMENT HOOM COOtfRS.

CHILLER PALMAGE HS-5 OD (6) PROVIDES ROOM COOLING TO COM- l (6) LOCALLY START COMPONENT COOLING WATER HS- OC PONENT COOLING WATER PUMP ROOM. 1 PUMP ROOM F AN d2Pg, CMJLT*

l I-LCV-112D (7) ALIGNS RWST TO CHARGING PUMP (7) MANUALLY OPEN:

SUCTION FOR SOURCE OF BORATED o RWST TO CHARGING PUMP SUCTION VALVE MAMEUP WATER.

1-8111 (8) PROTECTS THE CENTRIFUGAL (8) MANUALLY OPEN: CHARGING PUMP DURING LOW o MINIFLOW CHARGING ISOLATION VALVE FLOW CONDITIONS.

1-LCV-1128 (9) PREVENTS LOSS OF NPSH TO (9) MANUALLY CLOSE VOLUME CONTROL TANK 5UCTION OF CHARGING PUMPS ISOLATION VALVL LCV1128 I-HS-58028 (10) PROVIDES ROOM COOLING TO l (10) LOCALLY $ FART CHARGING PUMP ROOM FANQgpf (2(L. 1-HS-5 2C CHARGING PUMP ROOM 1-8483A (11) TO MAINTAIN PRESSURIZER

(!!) MANUALLY REGULATE PRESSURIZER LEVEL ICS8345 LEVEL AT APPROXIMATELY 50%

CONTROL VALVE PAGE 2 OF 2 J

t/ sum. OF ACTIVITIES /4-1.1 Pt74 l

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• TABLE 4-1.3 (CGNTINUED)

TEMAS UTILITIES GENERATING COMPANY i

COMANCHE. PEAK. STEAM ELECTRIC STATION

SUMMARY

OF ACTIVITIES FOR REACTOR OPERATOR 1 REFERENCE

• COMPONENT BASIS OF ACTIVITY SfCitoN ACTION - ,

l o CONTROLL ER 1-LCS-56844 1-HS-5684A2 l .

0 CONTROLL ER ' 1-LCS-56848 1-HS-568482 l START-SwtTCH: 'l 1-HS-5684A3 l 1-HS-568483 t SWITCH - (6) OISCONNECT POWER TO AL LOW F OR (6) TURN-OFF AT MCC IE -1:

MOV 1-HV-24918 MANUAL ALIGNMENT CAPABILliv OF o STEAM GENERATOR OOP al ISOLATION VALVE MOV 1-Hv-24928 AFw TO SG ISOLATION VALVES.

o STEAM GENERATOR LOOP s2 ISOLATION VALVE o STATIC 1NVERTER IVIEC2 l DEENERGIZES AC INPUT TO INVERTER.

THE INVERTER SUPPLIES POWER 10 l ICS-8221 AND THE 1/P CONvFRIERS l THAT CON 1ROL SG PONVS I PV / J 2 ti I l j

AND 1PV2328.

i j

MANUALLY OPEN: VALVE: , 17) ESTABLISH AUMILIARY FEEDWATER l o l (1) 1-HV-24918 FLOW PATH TO STEAM GENERATOR I j L l o 1/SG MDAFwP SUPPLY LINE CUTOUT 1AF-076 1-HV-24928 OR 2.

I o 2/SG MDAFwp SUPPLY ISOLATION 1AF-084 l 1

CABINET (8) ELIMINATES ALL COMPONENTS POWERED (H) ALIGN 6.9MV SwlTCHGEAR SUS IEA2 BY 1EA2-1 BY TRAIN 8 FROM SPURIOUSLV OPER- l o VERIFV INCOMING BREAMER ATING INCLUDING 1-8100, 1-80018, I (START-UP 345KV) TRIPPED 1-83SjA, 3-834]B, 3-83 SIC, j o VERIFY INCOMING BREAKER (BUS 1A2) 1EA2-2 I 1-8351D.

TRIPPED ,'

1EG2 o MANUALLY TRIP DG FEEOWATER BREAKER AND l REMOVE 304 BREAKER CLOSE BUSES l l

VALVE: (9) PREVENT UNCONTROLLED RCS MAkE-UP ,

(9) MANUALLY CLOSE HI HEAD SAFETY INJECTION 1-80010 CAPABILITV. l l VALVE 1 i PAGE 2 OF 3 T/%UM. OF ACTIVITIES /4-1.3 PIF4

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TEXAS UTILITIES-GENERATING COMPANY COMANCHE PEAK STEAM ELECTRIC STATION

SUMMARY

OF ACTIVITIES FOR REACTOR OPERATOR 2 M

- 2'4 .

r--~~NrrrRrwit StLIEUN

- "'il COMPONENT gY BASIS OF.ACTIVITV . ,

ACTION i- l

' l SWITCH: (1)- STOP HEAT AND POWER GENERATION. l (1) IN1P THE REACTOR ykt CRMRT HOT SHU';DowN (2) PRECLUDE: LOSS OF RCS INVENIORV. l (2) >PFnATE sw1TCHES AT TFE HSP TO ENS RE \ PANEL (HSP): UNCONTROLLED COOLDOWN. PHLSSukt sIVS Ct04_tu)tS_G. PORVS CLOSED.CPRES$UR_; REDUCTION. l CPI-ECPRLV-01 1 7 4 tN PUN (hJbb@hbe. ANU LLIUUWN ISOLATED l "A" START DIESEL GENERATOR (3) PROVIDE EMERGENCY POwfR TO I 2 tal suB5EQUtNT TO DIESEL GENERATOR"A" OUTPUT BREAKER "A" OUTPUT BREAKER EMERGENCV SAFEGUARD DUSES. l l

CLOSE OtESEL GENERATOR AI THE HSP t l

l TRAIN "A" HSP (4) ESTABLISH COOLING TO DIESE L s.t N - l

14) STAki h!ATION SERVILE WATER PUMP F1 SWITCH: ERATOR. CENTRIFUGAL CHANGjNG l

I-HS-4250C PUMP LUBE OIL COOLER AND COMPON- l ENT COOLING WATER HEAT E M(.H A ngl H ,

l l

< TRAIN "A" HSP (5) ESTABLISH AUMILIARY FfEDWAftH th) START MDAFW PUMP #1 5 WITCH: FLOW TO STEAM GENERATORS.

I l-NS-2450C TRAIN "A" HSP (6) MAINTAIN STEAM GENERATOR

.(b) MANIPULATE AUXILIARY FEEDWATER ISOLATION CONTROL: INVENTORY.

VALVES 1-PV2453A OR 1-PV24530 TO 1-FK-2453C CONTROL STEAM GENERATOR INVENTORY 1-Fk-2453D TRAIN "A" HSP (7) ESTABLISHED COOLING WATER TO (T) START SAFETV CHILLED WATER RECIRCULATION SWITCH PUMP AND ELECTRICAL AREA ROOM PUMP #5 1-HS-6TOOFL FANS.

TRAIN "A" HSP (8) ESTABLISH COMPONENT COOLING (8) START COMPONENT COOLING WATER PUMP #1 SWITCH: WATER TO SEAL WATER HEAT EM-1-HS-4518C CHANGER. UPS A/C AND SAFETV CHILLED WATER CONDENSERS.

TRAIN *A" HSP (9) ESTABLISH PRIMARY INVENTORY (9) START CENTRIFUGAL CHARGING PUMP at TO SWITCH: CONTROL.

LSTABLISH CHARGING FLOW 1/1-APCt PAGE 1 OF 1 T/ SUM. OF ACTIVITIES /4-1.4 P!T4

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9 TEXAS UTILITIES GENERATING COMPANY COMANCHE PEAK STEAM ELECTRIC STATION Main Control Room & Cable Spreading Room Fire Scenarlo Reactor Operator No. 1 (Time In Minutes) .

25 30 35 ~

10 '15 20 l I l l l _ l u

l, [ l l 1 Tripped.

1 l 1Control

- 5 l l Room l l 1Evacuated 1IlllIl1il1 l' l I I I l l R.

-1 SFGD Bldg.. 810'-6". Rm. 83 1

l-----l e Sip contact HSPs Complete Saltch L8ne Up e Switchgear Bus 1EA1 Remove 30A Breaker Close Fuses & Manually l e t o ts, enker s fue l-----) o Containment.-Spray Pump #1 (BKR APCS 1) o Containment Spray Pump 83-(BKR APCS 3) o Safety Injection Pump al (BMR APS11) w Switchgear Bus IEB1 Manually Trip Breaker fors ll o Positive Displacement Charging Pump (BMR IAPPD1) g e MCC 1EB1-1 Turn-Off MOV 1-HV-2452 and IVIECI (see NOTE li ll e MCC 1EB3-2 (Adjacent to STP Panell' Turn-Off MOV l-HV-H8114 Transfer Control and Start Electrical Aved Fans 1-LCS-5684A (1-HS-5684A2/1-HS-5684A3) and 1-LCS-56848 (1-HS-568482/1-HS-568483) l--------- -l Arrived e SFGD Bldg. 852*-6". Am. 100 MCC 1EB2-1 e MCC IEB2- 1 Tur n-Of f MOV 1-HV-249tB. MOV 1-HV-249?B and IvlEC2 Isme NOTE 11 Manually

(----l SFGD Bldg.. 859'-6". Rm. 100A, (Second Cubicle on Plat f or m). Platform).

open 1AF-076 .(MOV 1-HV-24918) and (Third Cubicle un Manually Open 1AF-084 (MOV 1-HV-24928) l-----l SFGD Bldg., 852*-6". Rm. 103 e 6.9kV Switchgear Bus 1EA2 Verify:

o Incoming Breaker (Start-UP 345kV) Tripped (IEA2-1) o Incoming Breaker (Bus 1A2) Tripped (IEA2-7) o Remove Panel Cover & Remove id Manually Trip304 DGBreaker Feeder Close Breaker Fuses IEG2for DG Fe der De edker 6N1e 5FGO r Bit 9 810*-6*, Rm. 775 l--------l -.

[------l Manually Close 1-88'018.__ Manually Opees 1-8351A avid 1-83518 L- . must 4; l---l w Rm. 77N Manually Open 1-835tC and 1-83510

~' -

Manually Close 1-810t '

FIGURE 4-1 7 ---

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TEMAS UTILITIES GENERATING COMPANY COMANCHE PEAK STEAM ELECTRIC STATION Mdin Control Room & Cable Spreadtrig Room Fire Scenerlo konctor Operator No, 1

• * * - -  :... ;C.

. . .y- _

Ho1E 1: . . . _----- . -_ .._ --

IVier7 IVIErl .:r n - '

m .

Tripping IVIEC2 w MCC 1E82-1 deenergizes the AC Tiisipirig IV1EC1 e MCC 1E81-1 deenergizes the The inverter suppites input to the inverter. The inverter supplies As- Insmut to the inverter. power to ICS-8221 and the I/P .:onverters that s.own e ' t .a 1CS-8220 & the I/P converters that control SG PORVs 1PV2326 & 1PV2328. {

..unt s o f SG PORVs IPv2325 & IPV2327.

two l t. 2:

The following valves will tse deenergized when power is removed from 6.9kV switchgear bus IEA2r 1-83S1A

.1-83518 1-8351C

' 1 -il .1510 1 OWO l-62Cf6 p/

4 FIGURE 4-1 (continued) 1 t

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.1

. TEXAS UTILITIES GENERATING COISPANY , '!

COMANCHE PEAK STEAM ELECTRIC STATION Main Control Room & Cable,$preading Room Fire.Scenerlo Reactor Operator.No. 2-

-(Time In Minutes) ,

b 10. 15' 20 .

25 30 JS H. -

. l . l. _ , l __I l l i I l' l l l l 'l I l l I l l l l . l l' I I I I' l l l l ! l ~ ' Lil

.I 'R. Tripped,' Control Room Evacuated l----lSF60 Slog., 831*-6".'Rm. 96 Proceed to'HSP~

l' e the HSP. Switch Lineup Complete. {

-l----------------~~---- Stattoned at HSPt i Diebel Generator Started I Station Service Water Pump Started

! MOAFw Pump Started I AFW Flow Established to Steam Generators 1 and 2 I Safety Chilled Water Recirculation Pump Started i Component Cooling water Pump St arted 1- Centrifugal Charging Pump Started I

1 a

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. f. "**' * : . C. ' '[ ~ i TEXA5 UTILITIES GENERATING COMPANY CDMANCHE PEAK STEAM ELECTRIC STATION.

' Main Control Room & Cable Spreading Room Fire. Scenario

-Auntitary, Operator'No. 1

's ' *

(Time In Minutes) lu 15 20 25 30 35

'u S l- I I I I I I 'l' I I 'l i I I I- 1 I I I I ! _I I I I I I i 1 1 I I I I I l' Turbine Bldg..'810*-6" Rm. 31 Remove the 30A Breaker Close Fuses & Manually Trip Dreakers to RCP's't.2.J 2-l--------)

and 4 (BKRs IPCPX1, 1PCPX2. IPCPx3 IPCPx4)

[-----l E&C B109.. 77*. Rm. 115C Start Train *A- UPS HVAC . Unit e Panel CPX-VAACUP-1A' by' Placing the Remote Sm 6 ' t h ' isi the "UN" l

l--l Position E&C Bldg.. 792*-0" (see NOTE 1)- .

E l--------]

o Rm. 321 w 125v DC Switchboar d 1ED1 Turn-Off Switches tur xEDn-1 l t t> t - 1 ents tvilCl o Rm. 119 e 125V DC Switchboard 1ED2, Turn-Off Switch IED2-1 and IVIEC2 Elev. Rm. 179 e MCC IFB4-1 Turn-Ott MOV 1 6111 MOV l--------l Aua. Bldg. to 790'-6*.

2-88126 and TIEC4 (see. NOTE 2)

[-------l E&C Bldg. 778'-O" Rm. 115A (enter from Aun. Bldg. 790' 6"). Start Ctil l i e r Pkg. by Placing Switch 1-H5-6710A un the Chiller Phy. Control Panel (1CHCICES) in the -ON* Position l-----l Aua. Bldg.. 810'- " Re. 205 Start CCW Pump Rooms o Transfer el and Start CCW Houm Fan 1 1 C 5-5R00 (1-HS-5800 -B -H5*5800C) 1--------) Aua. Bldg., 810'-6":

o in Corridor 207 adjacent to. doorway ut Pm. 20 e . g Manuelty Open 1-LCV-112D o In Rm. 203 Manually Open 1-HV-Hlli end Manually Close 1-LCV-1128 l--l Aus. B i tle . 610 ' - 6" . Outside Hm. 200:

o Near Doorway in Curr tdue 207 Teanstes Conteut and Start CCP Huum Fan 1-t r$ -hMO2 (1-NS-5802-B/1-HS-5H07-C) l --------- Aus. t$ 4 :19.. H//', 4m. / t i'8 Valww Opea r . Huum Lusst e al 1 H4t434 us 10 St6345 Manual l y t .6 Maintain Pressurtees. Level

• Approntmately '30%

FIGURE 4-3

., , p ------;-- -

7- ,.

, .e .s

,j ;i 7" .. C; , (. 'f '

4 ' "9 ' ! .

i TEXAS UTILITIES GENERATING COMPANY

' COMANCHE PEAK STEAM ELECTRIC STATION.

' Main Control Room & Cable Spreading Room Fire Scenario Auntilary Operator No..!

a Nott,ts The following valves will be deenergized by' turning off the specified switch at the correspondinu 125V do sw i t chtscar d s e 1E02 j w itD4 1ED2-1

)

ItD;-t 1PV2326 (deenergizes power 1Hvar20 7 1PV2328- to limit switches)-

'Inv %06 1HV3609-I' IPv4536 1HV3610 IPd2325-(desnergtzes power to IPv2327 limit switches) atui 1 IPVI254 IVIEC2 The a v 16 e's . Deenergizes the DC input to the inverter.

Dewi$iul ses thw DC input to the. inverter. The inverter supplies power to ICS-8221 enis the 1/P 6n.wesee supplies power to 1C5-8220 and the I/P converters that control SG PORVs IPV2326 and IPV2J28 seanvweters that control SG PORVs 1PV2325 and IPV2327.

IV1EC2. The inverter supplies power to 105-8221 and the I/P Nott 4: Totpping TIEC4 e MCC IE84-1 doenergizes the AC input to converters that control SG PORVs 1PV2326 and IPV2328.

I i

l 4

FIGURE 4-3 (continued) o i

^

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