ML13329A748

Rev 10 to 125V DC Battery No 1 Sizing

ML13329A748
Person / Time
Site:	San Onofre
Issue date:	06/21/1991
From:	Matiog A Southern California Edison Co
To:
Shared Package
ML13329A747	List: ML13329A746 ML13329A748 ML13330B540
References
DC-1604, DC-1604-R10, NUDOCS 9108020178
Download: ML13329A748 (34)

Text

ENCLOSURE 2 125V DC Battery No.1 Sizing Calculation No. DC-1604, Supplement V 9108020178 '910729 PDR ADC 5

F JI:

5 00:206 PDR

(For ICCNs Only)

DCP/MMP NO.

REV.

ICCN NOJPREIMINARY CCN NO. NA CCN CONVERSION:

CL.RV CALCULATIONC NO.RE.

CN-I-LS Southern California Edison Company CANCNO.TCCNCAO.

REV.

INTERIM CALCULATION CALCULATION TITLE:

CHANGE NOTICE (ICCN)/

CALCULATION CHANGE NOTICE I-2sv PC 5P-r-r-FLY RI.

I sfING (CON)

S.NjST GNATOR OICCNAORELMARY CCN N1O CC CONVERSION PAX DAE((rqPAGEL OF-41..

ADOV

'AA99f Lr-M eT V

INITCAATNG DOCUMENT (NCR. SPR.

LAER) 2.OTHER AFFECTED DOCUMENTS (CHECK~ AS APPLICABLE):

O YES 13 10 OTHER AFFECTED DOCUMENTS EXIST AND ARE IDENTIFIED ON ATrACl4EDISBfIS4 FORMS.

THE APPICABLE SOURCE DOCUMENT IS IDENTIFIED AS FOLLOWS:

EQ THIS CON OR Q3 THE FOLLOWING DOCUMET 3o SCE DESIGN APPROVALS:

ORIGINATOR DATE ORIGA INDEPENDENT REVIEW EIGR.

DATE D

GROUP SUPERVISING ENINERDAE S

DISCIPLINE MANAGER DATE DISCIPME MANAGER DY

4.

CONVERSION To C ON DATE______________________________

S E CM-SONGS SCU e

Nw A/

FR

9A~ 2.OF-2'q CALCULATION TITLE PAGE otf=TVs.

Ofe 2g SONGS Unit DCPuMP No. & Rev.

Caic.No.

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I 4 G Engln**rng System Number Primary Station System Designator

__Claae Tech Spec Effecting O YES NO Section No.

Equipment Tag No.

Computer STANDARD COuPUTER PROGRAM PROGRAM NO(S)

VERSION/RELEASE NO.

Program YES F

NO ld% 12.5 RECORD OF ISSUES SCE TOTAL LAST DISC. or REV.

DESCRIPTION NO. of SHEET ORIG.

IRE GS DM DATE ESC

____________41__________________SHEETS NO.

Space for RPE Stamp, reference alternate calc., and notes as applicable.

This cale. was prepared for the Identliled DCP/MW. OCP completion and turnover acceptance to be verified by receipt of a memorandum directing OCH Conversion. Upon receipt, this tale. represent the as-built conditlon. Memo date by S

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Page 30 2-1 CALCULATION CROSS-INDEX SUPPLEMENT V Subject Caculation No.

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NES&L DEPARTMENT CALCULATION SHEET C.PAGE OF PRELIM. CCN NO.PAE O

CCN CONVERSION Project or DCP/1MP Station Blackout Calc No. DC-1604 Rev.

10 CCN NO.

kbject SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V3 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S. MATIONG TABLE OF CONTENTS Sheet 1.0 PURPOSE V5 2.0 RESULTS/CONCLUSIONS and RECOMMENDATIONS V6 2.1 RESULTS/CONCLUSIONS V6 2.1.1 Battery Capacity V6 2.1.2 Battery Terminal Voltage V6 2.1.3 Battery Charger Capacity V6 2.1.4 Battery Surveillance Test V7 2.2 RECOMMENDATIONS V8 Table 2.2.2: Service Test Profile V9 3.0 ASSUMPTIONS V10 4.0 DESIGN INPUT Vi Table 4.8: SBO Event Detailed V13 Load Profile 5.0 METHODOLOGY V18 5.1 Battery Capacity Calculations V18 5.2 Battery Terminal Voltage Calculations V18 5.3 Battery Charger Capacity Calculations V19 SCE 26-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET Cee.

N-1 PRELIM. CCN NO.

PAGE OF CCN CONVERSION Project cb DCP/WP Station 8(ackout Calc No.

DC-1604 Rev.

10 CCN NO.

tbject SONGS 1I 125V DC BATTERY NO.

1 SIZING Sheet Mo.

SUPPLEMENT V Sheet V4 of V28 REV ORIGINATOR DATE IRE I DATE REV ORIGINATOR DATE IRE DATE 0

A. S. MATIONG TABLE OF CONTENTS (CONTINUATION)

Sheet

6.0 REFERENCES

V20 7.0 NOMENCLATURE V21 8.0 COMPUTATIONS V22 8.1 Battery Capacity V22 Table 8.1:

Battery Sizing V23 SBO Event Loading Conditions Figure 8.1: Battery Discharge Characteristics V26 Curves For GNB Type NCX-2550 8.2 Battery Terminal Voltage V27 Table 8.2:

Battery Terminal Voltage Calcs.

V27 SBO Event Loading Conditions 8.3 Battery Charger Capacity V28 SCE 26-426 NeW 4/90

NES&L DEPARTMENT CALCULATION SHEET

.CCN No. N PRELIM.

CCN NO.

IPAGE OF C CN CONVERSION Project or DCP/N Station Blackout CaLc No. DC-1604 Rev.

10 CCN O.

Subject SONGS I 125V DC BATTERY NO. -

1 SIZING Sheet No.

SUPPLEMENT V Sheet VS of v28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A.

S.

MATIONG 1.0 PURPOSE The purpose of this calculation supplement is:

To demonstrate that Battery No. 1 (D04) has the capacity and the capability to continue to supply power to the required components identified in Station Blackout Analysis Document No. 90050 during a 4-hour station blackout (SBO) duration, as well as support Emergency Diesel Generator (EDG)

No.1 manual random restart attempts throughout the SBO duration.

To demonstrate the capability of each battery charger, per Technical Specification 4.4.D.2.c(4) requirement, to restore the battery to a fully charged state within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> following SBO recovery.

Acceptance Criteria:

The battery, operating at 80% capacity and 610F electrolyte temperature, shall be able to satisfy the SBO duty cycle requirements. In addition, the battery terminal voltage shall be at least 106.91 volts to ensure at least 105 volts is maintained at the inverter terminals throughout the 4-hour SBO duration.

Each battery charger shall have adequate ampere capacity to restore the battery to a fully charged condition within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> following ac recovery from a station blackout event.

Since no design basis accidents or other events are assumed to occur immediately prior to or during station blackout, this calculation supplement is limited only to the verification of battery capability to provide for the SBO load requirements as well as the charger's ability to restore the battery in its fully charged state within the specified recharging time.

Credit is taken for manual dc load shedding operations during the SBO duration.

SCE 28-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET

[CCU NO. N PRELIM:.

CCN NO.

PAGE OF CCN CONVERSION Pr4ject or DCP/W Station Blackout Caic No. DC-1604 Rev.

10 CCN NO.

Sibject SONGS I

125V DC BATTERY No.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V6 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A.

S. MATIONG 2.0 RESULTS/CONCLUSIONS and RECOMMENDATIONS 2.1 RESULTS/CONCLUSIONS 2.1.1 Battery Capacity The results of the calculations shown in Table 8.1 indicate the battery can cope with the 4-hour station blackout, as well as support Emergency Diesel Generator (EDG) No. 1 manual random restart attempts throughout the 4-hour SBO duration, provided manual shedding of dc loads are performed in the sequence of operations identified in Sections 2.2.1 and 4.8.

2.1.2 Battery Terminal Voltage The results of the calculations shown in Table 8.2 indicate a minimum battery voltage of 107.59 volts, thereby ensuring at least 105 volts at the inverter input terminals during the SBO duration.

2.1.3 Battery Charger Capacity The results of the battery charger sizing calculation in Section 8.3 indicate a required charger ampacity of 555.35 amperes.

Each battery charger is rated 1000 amperes.

Therefore, each charger has the capacity and capability to restore the battery to a fully charged state within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> following ac power restoration.

0D SCE 26-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET PRELIM.CCN NO.

PAGE OF CCN CONVERSION Project or DCP/WP Station Blackout Catc No. DC-1604 Rev.

10 CCN NO.

Subject SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V7 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0 A.

S.

MATIONG 2.1.4 Battery System Surveillance Requirements Battery Service Test The new SBO-based load profile is more severe than the SISLOP-based accident load profile.

However, there is no present requirement for battery service testing to the SBO profile.

Should a service test to the SBO load profile be required in the

future, station maintenance procedures, which presently use a service test profile based on the accident load profile shown in calculation Supplement T, shall be revised accordingly as recommended in Section 2.2.2.

• Battery Charger Capability Verification The 555.35 amperes charger ampacity required to recharge the battery following SBO recovery is well within the surveillance requirements of Technical Specification 4.4.D.2.c(4) and Station Maintenance Procedures S0123-I-2.5 and SO123-I-2.6, which specify verification of battery charger capability to supply at least 800 amperes for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

Therefore, no change to Technical Specification 4.4.D.2.c(4) or Station Maintenance Procedures S0123-I-2.5 and SO123 1-2.6 is required.

2.2 RECOMMENDATIONS Based on the above results and conclusions, the following actions are recommended:

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PAGECO PRLM. CCN NO.

tPAGE OF CCN CONVERSION Pruject or DCP/W Station Blackout Catc No. DC-1604 Rev.

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Abject SONGS 1 125V DC' BATTERY NO.

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SUPPLEMENT V Sheet V8 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S.

MATIONG 2.2.1 When the new SBO requirements are implementd, revise Emergency Operating Instruction SO1-1.0 60 to include the following manual dc load shedding operations during SBO:

DC Bkr. No.

Trip After Load Description See Note 30 minutes Emergency RCP Thermal Barrier Pump 72-139 45 minutes Emergency Bearing Oil Pump 72-102 90 minutes Turbine Plant Annunciator 72-104 90 minutes Reactor Plant Annunciator 72-109 90 minutes Hydrogen Control Panel 72-110 90 minutes Digital Fault Recorder 72-111 90 minutes Turbine Controls 72-121 90 minutes Chemical Control Board 72-122 90 minutes Containment Spray System 72-123 90 minutes Sphere Isolation Valves 72-124 90 minutes Sequencer No.

1 72-127 90 minutes HVAC Control Board Annunciator 72-129 90 minutes Radwaste Control Board Annunciator 72-131 90 minutes Inverter No.

4 72-134 90 minutes NIS Coincidentor Cabinets A and B 72-136 90 minutes Inverter No.

2 72-140 90 minutes Emergency Lighting Switchboard 72-141 90 minutes Control Rods 72-138 180 minutes Emergency Hydrogen Seal Oil Pump NOTE: Turn off pump at the Control Room.

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CCN NO.

PAGE OF CCN CONVERSION Project or DCP/WP Station 8tackout Calc No.

DC-1604 Rev.

10 CCN NO.

Suaject SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V9 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S.

MATIONG 2.2.2 Should a surveillance test based on the SBO load profile be required, revise Station Maintenance Procedures S0123-I-2.5 and S0123-I-9.301 to reflect the new surveillance service test profile shown in Table 2.2.2, which envelops the accident load profile.

TABLE 2.2.2 BATTERY SURVEILLANCE SERVICE TEST PROFILE Period in Mins.

0-1 1-30 30-45 45-90 90-180 180-239 239-240 DC Amps 1195 741 646 434 256 140 283 The minimum battery terminal voltage is 106.91 volts for Station Maintenance Procedure S0123-I-2.5 and 1.845 volts per cell for Station Maintenance Procedure S0123-I-9.301.

0 SCE 26-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET

!"C "

NO. N-P PRELIM. CCN NO.

IPAGE It OF

.*ICCN CONVERSION Project or DCP/W Station Blackout Catc No.

DC-1604 Rev.

10 CCN NO.

4biect SONGS I 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V10 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S. MATIONG

{/74 LJ I 3.0 ASSUMPTIONS 3.1 Based on SONGS 1 Station Blackout Analysis Document No.

90050, Rev.

0, no credit can be taken for manual dc load shedding operations prior to 30 minutes into the station blackout.

3.2 After failure of the Emergency Diesel Generator to automatically start during the first minute, depending on starting air supply capability, multiple manual start attempts are assumed to occur randomly as follows:

During the 1-30 minute period of the duty cycle.

During the 30-45 minute period following manual tripping at the Control Room of the RCP Thermal Barrier Pump at the 30th minute. Credit is taken for DSD operation and Charging Pump operation within one hour.

During the 45-90 minute period of the duty cycle following manual tripping of the dc breaker for the Emergency Bearing Oil Pump 'at the 45th minute.

During the 90-180 minute period following tripping of additional dc load breakers at the 90th minute.

These load breakers are listed in Table 4.8.

During the 180-240 minute period following tripping of the dc breaker for-, the Emergency Hydrogen Seal Oil Pump at the 180th minute.

SCE 26-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET CC1N.

A PRELIM. CCN NO.

PAGE 1-OF CCN CONVERSION Project or DCP/WP Station Blackout Catc No. DC-1604 Rev.

10 ccN NO.

Subject SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet Io.

SUPPLEMENT V Sheet V11 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S. MATIONG Vill S60, 624 1

4.0 DESIGN INPUT 4.1 IEEE Stds 485-1983 and 450-1980 recommendation that a battery be replaced when its actual capacity drops to 80% of its rated capacity and. SONGS 1

Technical Specifications 4.4.D.2.e requirement that battery capacity is at least 80% of the manufacturer's rating when subjected to a performance discharge test.

4.2 Technical Specification 4.4.D.2.b.(3) which specifies 61 0F minimum battery electrolyte temperature.

4.3 SONGS 1 SBO Analysis Document No. 90050, Rev. 0, which identifies the 4-hour coping duration for SONGS 1,

designates the Dedicated Safe Shutdown (DSD) system as the alternate AC (AAC) power source, and analyzes AAC availability within one hour of SBO event and capability to power the required DSD equipment and instrumentation throughout the SBO duration.

4.4 Emergency Operating Instruction S01-1.0-60, Rev.

8 Loss of All AC Power identifying the non-vital dc loads to be shed. This includes the Emergency Bearing Oil Pump which, based on Westinghouse's estimated 30-40 minutes time for the turbine to come to rest following SBO initiation, can then be manually tripped after 45 minutes (Reference 6.6 of this calculation supplement).

4.5 Minimum 105 volts required at the inverter terminals based on inverter input low voltage shutdown setting of 104+/-1 volts dc (Reference 6.11).

4.6 Battery Charger walkdown information (360 amperes normal continuous dc output current on 5/28/91) from A. B. Samanta of Station Technical.

SCE 26426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET J,-'O PAGE OF CCN CONVERSION Project or DCP/et Station Blackout Calc Mo. DC-1604 Rev.

10 CCN NO.

SUbject SONGS 1 125V DC 9ATTERY NO.

1 SIZING Sheet Mo.

SUPPLEMENT V Sheet V12 of V28 REV OIGINATOR DATE IRE DATE REV ORIGINATOR DATE 0

A. S. MATIONG (I

4.7 The proposed replacement for the Train B battery bank (Battery No.

2) will be adequate to support the station blackout requirements.

Control Room instrumentation and controls supplied from Train A Inverters 1 and 3, and Train B Inverter 5 will be sufficient to satisfy the minimum control room instrumentation during station blackout (Reference 6.12).

As such, loads noted in Table 4.8, including Train A Inverters 2 and 4, can then be manually tripped in order to reduce loading on Battery No. 1.

4.8 The resultant load profile shown in Table 4.8 developed based on:

The SISLOP-based loading tables of Table 5.1.142 of Supplement T, Revision 3 (DC-1604 Revision 9),

considering those loads associated with a LOP only. The random load (EDG restart) value for this calculation (Supplement V) is developed from the 0-1 minute loading of Supplement T Table 5.1.142.

Cycle XI load changes (the 10 amperes contingency load is used instead of the actual net load added since the service test was performed based on the load profile which included this 10 amperes contingency load).

Cycle XII contingencies (10 amperes).

Manual load stripping of selected dc loads to reduce battery loading.

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LA TILJ NOEE IeC NO. N-i IPRELIM. CCN NO.

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Subject SONGS 1 125V DC BATTERY NO. 1 SIZING sheet No.

SUPPLEMENT V Sheet V13 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S. MATIONG TABLE 4.8 SBO Event Detailed Load Profile Breaker No.

0 to 1 to 30 to 45 to 90 to 180 to Random

& Load ID 1 min 30 min 45 min 90 min 180 min 240 min Load Manual Actions Required 72-101 9.1 0.0 0.0 0.0 0.0 -

0.0 None Reheater Stm Dump Control 72-102 15.9 15.9 15.9 15.9 0.0 0.0 Open DC breaker 2 90 minutes Turbine Plant Ann 72-103 77.3 4.4 4.4 4.4 4.4 4.4 None 4160V Swgr 1A and 1C 72-104 17.4 -

17.4 17.4 17.4 0.0 0.0 Open DC breaker 990 ainutes Reactor eD...

Plant Ann 72-105 0.0 O.0 0.0 0.0 0.0 0.0 90.0 None Emerg DG1 Exe Control 72-106 0.0 0.0 0.0 0.0 0.0 0.0 None Area Load Freq Cont 72-107 0.0 0.0 0.0 0.0 0.0 0.0 None 480/4160V ACS Test Panet

)

72*108 56.1 0.1 0.1 0.1 0.1 0.1 None Cen & Xfmr Relay Bus SCE 26-420 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET ICCN NO. N-1PAE6 PRELIM. CCN NO.

PAGE 16 OF 1 CCN CONVERSION Project or DCP/WP Station Blackout Caic No. OC-1604 Rev.

10 CCN NO.

Subject SONGS 1 125V DC BATTERY NO.

I SIZING Sheet No.

SUPPLEMENT V Sheet V14 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE A.

S.

MATIONG S4 q. 6 Table 4.8 Continuation Breaker No.

O to 1 to 30 to 45 to 90 to 180 to Random

& Load ID i min 30 min 45 mn 90 min 180 min 240 min Load Manual Actions Required 72-109 2.7 2.7 2.7 2.7 0.0 0.0 Open DC breaker a 90 minutes Hydrogen Cont PnL 72-110 3.8 3.8 3.8 3.8 0.0 0.0 Open DC breaker 9 90 minutes Digital Fault Rec 72-111 7.6 4.3 4.3 4.3 0.0 0.0 Open DC breaker a 90 minutes Turb Cont 72-112 2.7 1.0 1.0 1.0 1.0 1.0 None 480V Sugr No. 1 72-113 0.0 0.0 0.0 0.0 0.0 0.0 None Turb Prot 72-114 31.5 0.0 0.0 0.0 0.0 0.0 21.0 None Emerg DGI Fuel Oit Pp 72-115 36.0 0.0 0.0 0.0 0.0 0.0 None Generator Field Cant 72-116 1.5 0.6 0.6 0.6 0.6 0.6 None 480V Swgr No. 3 72-117 27.4 27.4 27.4 27.4 27.4 27.4 None DO Btdg Emerg Ltg 72-118 0.0 0.0 0.0 0.0 0.0 0.0 None SIS/LOP Lockout Rty SCE 26-426 NEW 4/90

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10 CCN NO.

Subject SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V of V2 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S.

MATIONG

& ' (w@ rC-. (/z4

<qf Table 4.8 Continuation Breaker No.

0 to 1 to 30 to 45 to 90 to 180 to Random

& Load ID 1 min 30 min 45 min 90 min 180 mtn 240 min Load Manual Actions Required 72-119 23.9 23.5 8.3 8.3 8.3 8.3 15.6 None ELP-1 Right Feed 72-120 94.6 63.2 0.0 0.0 0.0 0.0 Turn off pump from Control Room Emerg RCP 2 30 minutes Thermat Barrier Pp 72-121 4.6 4.6 4.6 4.6 0.0 0.0 Open breaker a 90 minutes Chemical Cont Board 72-122 2.1 2.1 2.1 2.1 0.0 0.0 Open breaker a 90 minutes Containment Spray Sys 72-123 5.5 5.5 5.5 5.5 0.0 0.0 Open breaker 2 90 minutes Sphere Iso Valve 72-124 8.0 0.0 0.0 0.0 0.0 0.0 Open DC breaker 2 90 minutes Sequencer 1 72-125 0.0 0.0 0.0 0.0 0.0 0.0 Noof Portable Exe Control 72-126 19.1 17.3 2.8 2.8 2.8 2.8 16.3 None ELP-1 Left Feed 72-127 0.9 0.9 0.9 0.9 0.0 0.0 Open DC breaker a 90 minutes HVAC Cont Board Anm SCE 2&426 NEW 4/90

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IPAGE OF CCN CONVERSION Project or DCP/wP Station Blackout Catc No. DC-1604 Rev.

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Subject SONGS I 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V16 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0 A.

S.

MATIONG Table 4.8 Continuation Breaker No.

0 to 1 to 30 to 45 to 90 to 180 to Random

& Load ID 1 min 30 min 45 min 90 min 180 min 240 min Load Manual Actions Required 7...........................................................

72-128 2.2 0.1 0.1 0.1 0.1 0.1 None Cond Steam Dump Cont 72-129 1.9 1.9 1.9 1.9 0.0 0.0 Open DC breaker 2 90 minutes Radwaste Cont Bd Ann 72-130 12.7 2.9 0.1 0.1 0.1 0.1 None SI Valves 72-131 54.7 54.7 54.7 54.7 0.0 0.0 Open DC breaker a 90 minutes Inverter 4 72-132 24.9 0.0 0.0 0.0 0.0 0.0 None Cen Bus Disc switch 72-133 0.0 0.0 0.0 0.0 0.0 0.0 None Spare 72-134 4.0 4.0 4.0 4.0 0.0 0.0 Open DC breaker 2 90 minutes NIS-Cofnc Cabs AAB 72*135 37.5 37.5 37.5 37.5 37.5 37.5 None Inverter 1 72-136 50.2 50.2 50.2 50.2 0.0 0.0 Open DC breaker 2 90 minutes Inverter 2 72-137 37.1 37.2 37.2 37.2 37.2 37.2 None Inverter 3 SCE 28-426 NEW 4/0

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Subject SONGS 1 125V DC BATTERY NO.

1 SIZING sheet No.

SUPPLEMENT V Sheet V17 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S. MATIONG w.24 i-Table 4.8 Continuation Breaker No.

0 to 1 to 30 to 45 to 90 to 180 to Random

& Load ID 1 min 30 min 45 mn 90 min 180 min 240 min Load Manuat Actions Required 72-138 174.0 116.0 116.0 116.0 116.0 0.0 Open breaker a 180 minutes Emergency Hydrogen Seat OIL Pp 72-139 318.0 212.0 212.0 0.0 0.0 0.0 Open DC breaker a 45 minutes Emerg Brg OfL Pump 72-140 6.0 6.0 6.0 6.0 0.0 0.0 Open DC breaker 2 90 minutes Emerg Ltg Switchboard 72-141 3.8 3.8 3.8 3.8 0.0 0.0 Open DC breaker 2 90 minutes Cont Rods Cycte XI Contingency 10.0 10.0 10.0 10.0 10.0 10.0 None Cycle XII Contingency 10.0 10.0 10.0 10.0 10.0 10.0 None TOTAL 1194.7 741.0 645.3 433.3 255.5 139.5 142.9 Applicable for the 0-1 Minute and the Random Load columns, the load shown for each breaker column represents the load on that breaker coincident with the peak loading during that particular minute of the duty cycle.

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PAG OF CALCULATION SHEET

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10 CCN NO.

s*ject SONGS 1 125V DC BATTERY NO.

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SUPPLEMENT V Sheet V18 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 101 A. S. KATIONG 4A1,q[c.

5.0 METHODOLOGY Using the resultant load profile shown in Table 4.6, battery capacity and terminal voltages, as well as battery charger capacity are calculated as follows:

5.1 Battery Capacity Calculation The end-of-discharge voltage is first determined by adding the worst case battery-bus and bus-inverter voltage drops to the minimum inverter terminal input voltage. The voltage drops are calculated using the following formula:

VD= 2 XIX RxL where: I = load in amperes R = conductor resistance in ohms/1000 ft at 750C L = circuit length in feet With the end-of-discharge voltage established, the required battery capacity is then calculated using the GNB NCX-2550 discharge characteristics curves per IEEE Std 485 guidelines.

5.2 Battery Terminal Voltage Calculation The battery terminal voltages calculated for each period of the battery duty cycle are calculated as follows:

Load Amps is the load amperes for the period.

Adjusted Load Amps is the Load.Amperes multiplied by the Aging Factor and the Temperature Correction Factor.

Adlusted Load Amps per Positive Plate is the Adjusted Load Amperes divided by the number of positive plates.

CE 26-426 NEW 4/90

NES&L DEPARTMENT

__NO._

CALCULATION SHEET PRELIM. C";'NO.

PAGE OF 1 CCN CONVERSION Project or DCP/MMP Station Blackout Catc No.

DC-1604 Rev.

10 CCN NO.

ubject SONGS I 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V19 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S.

MATIONG 4 I Sc I

Expended Amp-Hours per Positive Plate is the Adjusted Load Amperes per positive plate multiplied by the period duration.

For succeeding periods, it is the Expended Amp-Hours per Positive Plate of the period plus the Expended Amp Hours per Positive Plate of the preceding period.

Cell Volts is the cell voltage read directly from the battery discharge characteristics curves corresponding to the specific Amps per Positive Plate and Expended Amp-Hours per Positive Plate. The Begin voltage corresponds to the specific period Amps per Positive Plate and Expended Amp-Hours at the beginning of the period. The End voltage corresponds to the specific period Amps per Positive Plate and Expended Amp-Hours at the end of the period.

Battery Volts is the Cell Volts multiplied by the number of cells.

5.3 Battery Charger Capacity The ampere capacity of the charger is calculated using the following formula:

A = L + 1.1 (C/H) where: A = required capacity charger in amperes L = continuous load amperes H = number of hours for recharging C = ampere hours removed from the battery SCE 26-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET O.C.O b

PRELIM. CCN NO*

PA GE 0 OFM CCN CONVERSION Pcoject dr DCP/MP Station Stackout Calc No. DC-1604 Rev.

10 CCN NO.

Subject SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet Mo.

SUPPLEMENT V Sheet V2of vof REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S. MATIONG

6.0 REFERENCES

6.1 IEEE Standard 485-1983, Recommended Practice for Sizing Large Lead Storage Batteries for Generating Stations and Substations.

6.2 IEEE Standard 450-1987, Recommended Practice for Maintenance, Testing and Replacement of Large Lead Storage Batteries for Generating Stations and Substations.

6.3 Lotus 123 Computer Application Program, Release 2.01.

6.4 NUMARC 87-00, Guidelines and Technical Bases for NUMARC Initiatives Addressing Station Blackout at Light Water Reactors.

6.5 SONGS 1 Station Blackout Analysis Document No. 90050, Rev. 0.

6.6 Letter from R.G. Perez to R. Radakovic, dated 3/27/84 Westinghouse Site Input to Preliminary Battery Sizing Calculations.

6.7 One Line Diagram Dwg. 5102173, Revision 27.

6.8 Circuit Schedules M-30415-32 and M-30419-50.

6.9 SCE Electrical Engineering Guide, Section E9.2.

6.10 Emergency Operating Instruction S01-1.0-60, Rev. 8.

6.11 Repetitive Maintenance Order Nos.

96810000001, 96810000002, 96810000003 and 96810000057.

6.12 Letter from Bernie Carlisle to A.T.

Kaneko, dated 6/21/91, Minimum Instrumentation and Controls Required in the Control Room During a Station Blackout, San Onofre Nuclear generating Station, Unit 1.

SCE 26-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET j P Po..G OF PRELIM. CCU NO._PGE O

CCN CONVERSION P

-oect or DCP/MIP Station Blackout Cac No.

DC-1604 Rev.

10 CCN NO.

Sabject SONGS 1 125V DC BATTERY NO.

I SIZING Sheet No.

SUPPLEMENT V Sheet V21 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S. MATIONG

(

s 7.0 NOMENCLATURE D02 is the equipment designator for Battery Charger Set A D03 is the equipment designator for Battery Charger Set B D04 is the equipment designator for Battery No. 1 SCE 26-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET

,ICCN NO.PA PRELIM. CCN WO.PAE O

1 CCN CONVERSION Prbject or DCP/WP Station Blackout Calc No. DC-1604 Rev.

10 CC N N

O.

S'Albject SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V sheet v22 of v28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S.

MATIONG 8.0 COMPUTATIONS 8.1 Battery Capacity The minimum end-of-discharge voltage for the 58-cell battery bank (Vattery) is the sum of the minimum inverter input voltage (Vinverter),

the worst case battery-bus voltage drop (VDbattery-bus) and bus-inverter voltage drop (VDbs.inverter)*

From References 6.7, 6.8 and 6.9:

Battery-Bus feeder : 3-1/C#500 MCM per pole 47.5 ft circuit length 0.0265 ohm/1000 ft @ 75oc Bus-Inverter feeder: 1/C#4/0 MCM per pole 132 ft circuit length 0 0.0626 ohm/1000 ft @ 75 C The worst case voltage drop on the battery-bus feeder occurs during the initial minute of the duty cycle when battery load is at maximum (1195 amperes).

VDbettery-b

= 2(1195)(0.0265/3)(47.5/1000)

= 1.0028 volts The Inverter 4 supply feeder voltage drop represents the worst case bus-inverter voltage drop. Inverter 4 draws the most current (54.7 amperes) and is located farthest from the dc bus. Inverter 4 is located at the 4KV Switchgear Room while Inverters 1, 2 and 3 as well as the dc bus are all located in the DC Switchgear Room.

VD.Iedrter = 2(54.7) (0.0626) (132/1000)

= 0.9040 volt The minimum required inverter input voltage is:

Vfinverter 105 volts SCE 26-426 N6W 4/90

NES&L DEPARTMENT CALCULATION SHEET

,C E.

PRECLIM.

CCN NO*

AG O CCN CONVERSION arojecl or DCP/MW Station Blackout Calc No.

DC-1604 Rev.

10 CCN NO.

Sthject SONGS 1 125V DC BATTERY NO.

I SIZING sheet mo.

SUPPLEMENT V Sheet V23 of v28 I

REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A.

S.

MATIONG Therefore, the minimum battery end-of-discharge voltage is:

V=attery = 105 + 1.0028 + 0.9040

= 106.91 volts or 1.845 volts per cell Using the methodology described in Section 5.1, in conjunction with the battery discharge characteristics curves of Figure 8.1, battery capacity is calculated as shown in Table 8.1 below.

TABLE 8.1 Battery Sizing Calculations SBO Event Loading Conditions Lowest Eapected tlestrolyte Temps Nintlus Celt Voltage:

Cell Nfrs Cell Type:

Poes.

Plates:

61 F 1.845 cuS NC*2550 17 (1)

(2)

(3)

(4)

(5)

(6)

(7)

Care in Duration Time to End Capacity at Required Sectian site Load Lead of Period of Section T Kin tate (3)/(6) a Positive Vlates Period (aperes)

(apere)

(malutes)

(afrastes)

• • • .Asps/Pos.

Pt.

Poe. Values Me. ValuesSection I

• First Period Onty If A is greeter than Al. go to Section 2 I

AAl A- *OIa Tat a 1195.00 1195.00 1

1 104 11.49 Section Is Total 11.49 Section 2

• first Tw Perlods Onty

• if A3 is greater than AZ. go to SectIon 3 S

At At. 0 N1 a T w N14Q a 1195.00 1195.00 1

30 74 16.15 2

AZ AZ-Ala NZ T a NZ a 741.00

• 454.00 29 29 74

• 6.14 Section 2:

sdTotal 16.15

• 6.14 Total 10.01 SCE 26-426 NEW 4/90

N ES& L D EPA RTM EN T

_NO._

• CALCULATION SHEET OPRELIM.

CCN No.

PAGE % OF jCCN CONVERSIO Itroject'or DCP/MMP station Blackouit Catc Mo. DC-1604 Rev.

10 CCN NO.

SOblect SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V24 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0 A.

S.

MATIONG TABLE 8.1 Continuation Section 3

• First Three Perfods Only

• If A Is greater than A3, go to Section 4 I

Ala Al-0 NI Ta MI2**3M 1195.00 119,.00 1

As 65 18.38 2

Al.

A2 - At a M2

• T

• M2+N3 741.00

-454.00 29 44 65

• 6.98 3

3a A3 -AZm

3.

TaK3a 646.00

• 9500 Is 15 section 3:

S"b-Total 18.38 Total 10.28 Section 4

• First four Periods Only

• If AS Is greater than A4, go to Section 5 1

Al m At N.

a T a N1M2*N3+4 1195.00 1195.00 1

90 48 24.90 2

AZ AZ-At

• Q T - Z*M3*4, 741.00

-454.00 29 89 4

-9.46 3

AS A3 - AZ -

3 a am3.*4 646.00

-95.00 15 60 58

-1.64 4

A4 aAS.

A4.

Ta4a 434.00

-212.00 0S 4s 65

-3.26 Section 4S Sub*Totat 24.90

-14.36 Total 10.54 Section 5

• First Five Perofds Only - If A6 Is greater than AS. so to Section 5 1

Atl At l-N1 T

• NI N4*M3.K++S 1195.0 1t95.00 1

180 33 36.2 2

AZ.

AZ-t a

Mt a T w MZ*3+N4+MA 741.0

-454.00 29 179 33

-13.76 3

A3 AS - AS a N1 a Ta M*Meg.

46.00

-95.00 15 150 36

-2.64 4A4 a

A4

• A3 a X4 a

. agN4g.I 434.00

-212.00 45 135 39

-S.44 S

Asa AS-Aa 13 TuaGN 256.00

-178.00 90

-3.71 Section S:

Sub-Total 36.21

-25.54 Total 10.67

$C 21-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET 1ICON".NOPAGE OF2 CCN CONVERSION iroject or DCP/IW Station Stackout Caic No.

DC-1604 Rev.

10 CCN NO.

Saiect SONGS 1 125V DC BATTERY NO, 1 SIZING Sheet No.

SUPPLEMENT V Sheet V25 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S. MATIONG TABLE 8.1 Continuation Section 6 - First Six Periods only

• If AT is greater than A6, go to Section 7 1

Al*

Al **

T *14+M2+.....16 a

1195.00 1195.00 1

240 27 4.26 2

AZ A2Al a

2 TAl *M3N4+S+M6 741.00

• 454.00 29 239 27

• 16.81 3

AS.

A3

• A2 6 N3.6 T =M4*MS*M6 646.00

• 95.00 Is 210 29

• 3.28 4

A4 0 A4

• A3 s X4 a To M4+MS+M6 434.00

• 212.00 45 195 31

-6.84 S

AS.

AS - A4.

NS T *N5*146 256.00

• 178.00 90 150 36

.4.94 6

A6*

A6-AS.

M6S TM6Na 140.00

-116.00 60 60 58

-2.00 Section 6:

Sib-Total 44.26

• 33.87 Total 10.39 Random Load Only (Emergency Diesel Generator Restart) f AR Al*m MR T

M*

143.00 143.00 1

1 104 1.38 Naius Section Site Ran etion size Wserrested Size 10.67

+

1.38 12.05 this.

Size Teop. Correction Fctor Agig factor Required Size 12.05 a

1.11 a

1.25 16.71 Kergin * (Actual Site

• Realired Size) a 1005 I

Actiat Siae 1.68 5 NOTE:

The random load represents the EDG manual restart loads which could occur anytime between 1-240 minutes. The load associated with EDG auto-start is already included in the peak loading for the 0-1 minute period..

SCE 20-426 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET lCC,7NO.m-M PAGE OF CCN CONVERSION P oject or DCP/Iw Station Blackout Catc No. OC-1604 Rev.

10 CCw NO.

suject SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V26 of V2 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A. S.

KATIONG G4. 6'(I~.L. k FIGURE 8.1 Battery Discharge Characteristics Curves GNB Type NCX-2550 2.00 INITIAL VOLT's

-1.90 AVRG OLTS TO.7 l

0 T

1.80 >

DISCHARGE CHARACTERISTICS 1.70 OP GNB TYPES:

W NCX & NAX-600 NCX & NAX-1650 1.60

-. T-NCX & NAX-7SO NCX & NAX-1800

"""gNCX

& NAX-900 NCE & NAX-1950 240t NCX & NAX-1050 NCX & NAX-2100 40

-NCX

& NAX-1200 NCX & NAX-2250 2NCW

& NAX-1350 NCX & NAX-2400 9

4 NCX & NAX-1 500 NCE & NAX-2550"

>: 200-

/1 v

1 r

WITH FULLY CHARGED SPECIFIC ISO~ ~~

GRAI V

V AVITY OF 1.215 0 770F. (25eC.)

0

. TEST NO. T-4774 100 0

w w

2 40 1, 7g 20 0

10 20 30 40 50 60 70 80 90 100 110 120 AMPERES PER POSITIVE TO-1070118 SCU 26-420 NEW 4/90

NES&L DEPARTMENT CALCULATION SHEET CCN No. N-P PRELIM. ccN No.

I PAGEU OF7 1 CN CONVERSION Project or DCP/eIP Station Stackout Catc No. DC-1604 Rev.

10 CN NO.

bject SONGS I i25V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V27 ofV28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DAT 0. A. S. MATIONG (621 8.2 Battery Terminal Voltage Using the methodology described in Section 5.2, in conjunction with the battery discharge characteristics curves of Figure 8.1, battery terminal voltages during the discharge duration are calculated as shown in Table 8.2.

TABLE 8.2 Battery Terminal Voltage Calculations SBO Event Loading Conditions Time Period In Minutes 0.1 1-30 30-31 31-45 45-90 90-180 180-240 Load Amps 1195.00 741.00 739.00 646.00 434.00 256.00 140.00 Adjusted Load Asps 1658.06 1028.14. 1094.74 896.33 602.18 355.20 194.25 Adjusted Load A"p 97.53 60.48 64.40 52.73 35.42 20.89 11.43 per Positive Plate Expended AWsMrs 1.6 30.86 1.07 13.93 57.42 88.76 100.19 per Positive Plate egin 1.855 1.915 1.880 1.930 1.955 1.945 1.945 Cat Vots an 1.855 1.aas 1.910 1.915 1.905 1.910 1.935 Sgin 107.59 111.07 109.04 111.94 113.39 112.81 112.81 Battery Votts End 107.59 109.33 110.78 111.07 110.49 110.78 112.23 The EDG manual restart random load is imposed on the 30 31 minute because the lowest battery terminal voltage is calculated to be at the 30th minute. The initial minute end voltage which is lower is not considered to be the conservative voltage because the battery voltage recovers immediately following a load reduction and that diesel generator restart is not likely to occur immediately following a failed auto-start.

SCE 2420 NEW 4/90

CALCuUATION S

ECCT NO. N.

CA LULATIO. SHEET PRELIM. CCN NO.

PAGE OF CCN CONVERSION Project or DCP/MW Station Btackout Cate Mo.

DC-1604 Rev.

10 CCN NO.

• 1bject SONGS 1 125V DC BATTERY NO.

1 SIZING Sheet No.

SUPPLEMENT V Sheet V28 of V28 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0

A.

S.

MATIONG 6 D 8.3 Battery Charger Capacity Using the methodology described in Section 5.3, the required battery charger capacity is calculated below.

From the resultant load profile, the amperes removed from the battery (C) and the maximum continuous load (L) are:

C =

1195(1/60) + 741(29/60) + 709(15/60) +

434(45/60) + 256(90/60) + 140(59/60 + 283(1/60)

=

1407.95 ampere hours From Design Input 4.6:

L =

360 amperes The required recharging time (H) is:

H =

8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> The required charger ampere capacity (A) is:

A =

L + 1.1(C/H)

=

360 + 1.1(1407.95/8) = 555.35 amperes Battery chargers A and B, each rated 1000 amperes, therefore, have the capability of restoring the battery to a fully charged state within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> after ac power restoration.

SCE 26-428 NEW 4/90

ENCLOSURE 3 Justification for Removal of Loads From Battery No. 1 During a Station Blackout Justification For Removal of Loads From Battery No. 1 During a Station Blackout The Control Room must remain functional for the four hour coping duration of the SBO. Plant coping during the SBO is performed utilizing the DSD diesel.

The DC loads on-battery No. 1 listed below are removed during the station blackout and are not required for the Control Room to remain functional. The justification for removing loads at the indicated times during a blackout are provided. It should be noted that the plant configuration after removing the DC loads listed below is no different than the plant configuration when using the DSD diesel for plant shutdown after an Appendix R fire.

1)

DC Breaker No. 72-120 - Emergency RCP Thermal Barrier Pump The Emergency RCP Thermal Barrier Pump can provide alternate cooling to the RCP seals. However, during an SBO event, the thermal barrier pump is not credited. Seal cooling is provided along with RCS inventory makeup by the North Charging pump powered by the DSD diesel.

The SBO RCS inventory calculation assumes seal leakage consistent with NUMARC 87-00 guidelines for RCS inventory loss until charging is established utilizing the DSD diesel.

This load can be shed at any time.

2)

DC Breaker No. 72-139 - Emergency Bearing Seal Oil Pump.

The Turbine Bearing Emergency Oil Pump can be shed after the turbine comes to rest. Westinghouse estimates that the standard time frame for the turbine to come to rest is 30 to 40 minutes. The pump can be manually tripped after this occurs which can be assumed to be 45 minutes.

3)

DC Breaker No. 72-138 - Emergency Hydrogen Seal Oil Pump.

The Emergency Seal Oil Pump is used to prevent hydrogen leakage from

-the generator. After the DSD diesel has been started and loaded, operators will be available to remove hydrogen from the generator.

This process includes depressurizing, degassing and CO2 flushing.

Assuming one hour to start and load the DSD diesel and two hours to degas and partially flush the generator, this pump can be manually tripped after three hours.

-2

4)

DC Breaker No.

72-102 Turbine Plant Annunciator DC Breaker No. 72-104 - Reactor Plant Annunciator DC Breaker No. 72-109 - Hydrogen Control Panel Annunciator DC Breaker No. 72-127 - HVAC Control Board Annunciator DC Breaker No. 72-129 - Radwaste Control Board Annunciator These annunciators do not provide an instrument or control function and can be removed at any time.

5)

DC Breaker No. 72-110 - Digital Fault Recorder This provides a diagnostic tool to monitor pre-fault and post fault conditions in breakers and power supplies. This is not required to cope with a SBO and can be removed at any time.

6)

DC Breaker No. 72-111 - Turbine Controls After the turbine has tripped, these controls are no longer required and can be removed at any time.

7)

DC Breaker No. 72-121 - Chemical Control Board This provides the capability to obtain a Steam Generator Blowdown sample. This load is not required to cope with a SB0 and can be removed at any time.

8)

DC Breaker No. 72-124 -

Sequencer No. 1 The EDG has failed to start as part of the SBO scenerio and auto sequencing of the EDG is not required. This load can be removed at any time.

9)

DC Breaker No. 72-140 - Emergency Lighting Switchboard This provides DC control power to the incoming normal and standby supply breakers for the AC lighting switchboard. This load can be removed at any time.

10)

DC Breaker No. 72-141 - Control Rods Once the reactor has tripped this load is no longer required to cope with a SBO and can be removed at any time.

11)

DC Breaker No. 72-122 - Containment Spray System DC Breaker No. 72-134 - NIS Coincidentor Cabinets A and B Accidents are not assumed to occur concurrent with the SB0 event.

Therefore these loads are not required to cope with an SBO and can be removed at any time.

-3

12)

DC Breaker No. 72-123 - Sphere Isolation Valves This breaker powers the isolation valves for the sphere sample, sump discharge, and RCS drain.tank discharge lines. They all fail closed on loss of DC power. Closure of these valves meets the SBO position on establishing containment integrity. This load can be removed at any time.

13)

DC Breaker No. 72-131 -

Inverter No. 4 DC Breaker No. 72-136 -

Inverter No. 2 Inverters 1 and 3 will provide the minimum instrumentation required for the Control Room to remain functional during a SBO. Inverters 2 and 4 provide instrumentation that is redundant to that provided by Inverters.1 and 3.

Additionally, with the shedding of these breakers, the control valves powered by Inverters,2 and 4 are left in the same configuration as when the breakers are shed during a plant shutdown after an Appendix R fire which utilizes the DSD diesel.

SBO-BAS.MG2