ML18114A535

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Analysis & Sys Mod for 480 Volt Emergency Power Sys.
ML18114A535
Person / Time
Site: Surry  Dominion icon.png
Issue date: 05/03/1979
From:
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18114A534 List:
References
ZAR-790503, NUDOCS 7905070657
Download: ML18114A535 (24)
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Text

ANALYSIS AND SYSTEM MODIFICATION FOR 480 VOLT EMERGENCY POWER SYSTEM SURRY POWER STATION UNITS 1 .Al'/D 2 DOCKET NOS. 50-280 50-281 LICENSE NOS. DPR-32 DPR-37 ISSUED: May 3, 1979 VIRGINIA ELECTRIC AND POWER cm1PANY 790507 a*~.5 7

I. BACKGROUND Stone & Webster Engineering Corporation (S&W), while c:onducting an electrical load study of the Surry Power Station 480V Emergency Power System> discovered that maximum possible loading combinations on each of the redundant t~SOV emergency load centers would result in exceeding the capacity of the load center components. The load tabulations, upon which this conclusion was based included the follow-ing assu.rnptions:

(a) Each bus was considered separately with no diversity factor included for the division of loads between buses.

(b) All loads were assumed to be operating simultaneously at full load with no factor included for duty cycling.

(c) Load was based on the equipment rated brake horsepowers rather than actual system conditions.

Slimmation of the load tabulations thus determined indicated overloads;

. which, if they occurred and remained constant, would result in trip-ping the incoming line breakers by the long-time element of*the direct acting *trip device. Virginia Electric ancl Power Company (VEPCO) was informed of these findings at a me.eting held in the VEPCO Richmond dfices on March 22, 1979, follo,.;ed by S&W letter No. NUS-8199 dated March 29, 1979.

  • Because of the. safety functions of the Lf80V emergency system, an in-vestigation was initiatP.d immediately. following the March 22 meeting to determine a corrective action which would bring the system into conformance with design bases, including the conservative assumptions for loading listed abovee Also, VEPCO; pursuant to Surry Power Station Technical Specifications, Section 6.6.2.A.9 reported the occurrance by phone to the :tfoclear Regulatory Comrdssion (NRC) on March 23, 1979. Licensee Event Report No.* 79-008/0lT was sub-mitted to the NRC on April 5, 1979.

The corrective acticm which was subsequently ascertained to be most acceptable was the addition of a load center to each redundant train of the L180V system. This modification increases the 480V emergency power system capacity to easily accomodate the max.imum connected load on each bus for all station conditions. In addition, this modi-fication results in minimal disruption of existing circuits and mini-

. mal interruption of bus availability. The modified system conforms to the guidelines of. IEEE 308 and to the design bases requirements of the Surry FSAR.

II.

e ELECTRICAL LOAD ANAL-:i:SIS OF PRESENT SYSTEM e

A. Description of Existing liSOV Emergency Power System The 480V emergency power system for eachunit presently consists of two redundant buses ( 11 H11 and "J") powered from their respective 4160V emergency buses through a 4160V/480V, 1000/1333KVA transformer. The transformer secondary is connected to the 480V bus through a 1600A incoming line breaker. Each 480V loacl center bus powers the following safety-related loads:

(a) One containment spray pump (b) One low head safety injection pump (c) Two recirculating spray pumps (d) Two 480V motor control centers A one-line diagram of the Unit 1 4-80V emergency power system is in-cluded as Sketch 128Lf6. 23 EKS-1. A tabulation of the equipment con-nected to the 480V emergency power system is included in Appendix A of

  • this report.

B. Load Analvsis

1. Method of Analysis This analysis examines the capability of the Surry 480V emergency power suppJ_y system to meet desj_gn basis electrical loading requirements *. Each component of this system was analyzed under the following unit conditions.
a. Normal unit operation - 100% power
b. Loss of coolant accident (LOCA)
c. Loss of station power (hot standby)
d. Loss of coolant accident concurrent with loss of offsite power.

A detailed study of the controls for each load was undertaken using the station elementary and logic diagrams. This study determined which loads would be connected to the 480V buses for each of the above conditions.

To calculate bus loadings, the following guidelines were estab-lished:

a. All loads which cycle under automatic control (sump
  • pump, air compressors, etc.) were assumed running when analyzing a bus. This approach is highly conservative since it does not consider load duty cycling or di-versity factor.
  • b. Where available, drive equipment brak'e-horsepower

. was used for load tabulation. If brake-horsepower

.was not available, motor nameplate horsepower was used.

-e e

c. *where the control room operator has a choice of equip-ment providing redundant services (i.e., control room chillers) it was assumed that the equipment connected to the bus under analysis was in service.
d. All motor operated valves on these buses were con-sidered short term loads of relatively low demand.

The majority of these valves have operating times of-

. less than 30 seconds. They were not listed as con-tinuous loads on the bus.

e. The breaker trip points were determined from the time vs, current trip characteristic curves for the device. Because of manufacturing tolerances this curve is a band. The lower bound of this band was used to determine the earliest possible time at which the breaker could trip.

Each load on the 480V emergency bus was also reviewed with station operating supervisors to establish which are connected for various unit conditions. This review established which loads ran only for refueling or were started by manual con-trol (such as hydrogen recombiner). In addition, some loads were determined to be automatically shed by a consequence lim:.i.ting safeguard (CLS) signal, To assure the adequacy of the. remainder of the 480V emergency power system, additional checks were made. Using the results of the Load Tabulation of Part 2, the feeder cables from 4160V_

switchgear to load centers and from load center tomotor con-trol center were examined. Each was checked for required ca-pac.ity and allowable voltage drop. Also 1+160V and 480V feeder breakers to the 480V emergency power system were analyzed for

. load ~arrying capacity.

'.2. Tabulation of Results The bus loadings for Surry's 480V emergency buses have been compiled using the guidelines of Part 1 of this section. The

-..;arious unit conditions have been ,nbbreviated in the tabulation

-- as:

Normal Unit Operation - 100% power - Normal Loss of Coolant Accident - LOCA Loss of Station Power - (hot standby) - LOSP Loss of Coolant Accident With Loss of Offsite Power - LOCA

. w/LOOP

e LOAD IN ICvA EQUIP. LOCA RATING NORMAL LOCA LOOP W/LOOP MCC lIU-1 500 118 384 365 384 MCC lHl-2 500 121 275 293 275 HCC lHl-lA 250 35 25 25 25 Load Center 11 lH11 1333 607 1661 1026 1661 MCC lJl-1 500 270 368 348 368 N:CC lJl-2 500 278 367 393 367 MCC lJl-lA 500 35 29 29 29 Load Center "lJli 1333 866 1737 1059 1737 Ampacity and voltage drop for feeder cables are tabulated below.

PERCENT MAXIMUM VOLTAGE CABLE AMPACITY LOADING-AMPS DROP 4KV Feeder-Load Center lH 330 241 0.03 4KV Feeder-Load Center lJ 330 230 0.02 480V Feeders MCC 11-11-1 660 481 0.49 480V Feeders HCC lHl-2 660 367 0.92 480V Feeders MCC lHl-lA 143 48 1.10 480V Feeders MCC J.Jl*-1 660 461 0.27 480V Feeders MCC lJl-2 660 493 1.00 480V Feeders MCC lJl-lA 185 60 1.10

3. Analysis of Results Results of the load analysis are best examined from the tabulation section in Part 2.

a.. All 480V motor control centers ar:i.d their feeder cables are ca-pable of meeting load demand for the various plant conditions postulated. Voltage drop for all MCC feeders are within the normal allowable of 3 percent total drop for the entire feeder.

b. 480V load centers J.H and lJ and their feeder cables will supply loads for nonnal plant operation a:1d for a loss of station
  • power condition. During LOCA conditions these buses would

.experience an overload condition for the worst case loading.

This worse case loading does not include load diversity or

- utilization factors.

The overload on bus lH could represent 125% of the load center rating.

The over.load on bus lJ could represent 130% of the load center rating.

The design capacity of the following components would be ~xceeded.

a. 1000/1333 KVA, load center transformers
b. 1600, 480V incoming line breakers
c. 1600 AMP, main bus work within the switchgear

e e Of these components the one immediately affected by the overload is the 1600.A load center incoming line breaker. The breaker would sense the overload on its long time adjustable overcurrent trip elements, and based on the trip curves should trip anytime between 120 and 300 seconds.

The transformer is capable of carrying overload currents as given in ANSI Guideline C57.96 (dry type transformers). The 4KV cables feeding the load centers are capable of handling *these overloads.

In summary, the components of the Surry 480V emergency buses are capable of hand.ling loads of normal operation, and loss of-station power (hot stand-by). Under worst cases conditions) the load centers could be overloaded dm~*i.ng a loss of coolant accident and during a loss of coolant accident coincident with a loss of offsite power. Rowever,*the load center would not be subjected to any electrical damage or failure due to this overload. The 480V incoming line breaker for the "J" bus could trip as early as 320 secs following a LOCA and the "H" bus could trip as early as 520 secs following a LOCA. These trip times are also pessimistic~ since the upper hound of the trip characteristics indicate that the "H 11 bus may never trip and the "J" bus may trip as late as* 7 00 secs.

~.

A. -~.)'Stem Description

  • A 480V load center will be added to each train of the emergency power system. The equipment to be used will be Class IE load centers pur-chased for North Anna Units 3 and 4 and transferred from storage there.

The load center transformer primaries will be connected in parallel with the primaries of the existing load center transformers to the lil60V feeder breakers presently in use. Feeder cables to the exist*-

ing motor control centers (MCC) (i.e., two MCC 1 s per load center}

will be disconnected from the existing load centers and connected to t*he new load center of the associated redundant train of emergency power. The modification for Unit 1 is diagrammed on Sketch 128/f6 .23 EKS-2, and Unit 2 will be modified similarily.

B. Design Basis The design of the modified system is in full conformance with the design basis for emergency power systems as stated in the Surry Power

  • Station FSAR, Section 8 .5. In addition, the design. meets require-ments as detailed below:

.1. Perfonnance Reg_~irements A 480V load center is being added to each train of the emergency power system to increase capacity for accom.1110-dation of the most conservatively determined load (i.e.,

maximum connected load for each bus). The modified sys--

tern, in accordance with IEEE Standard 308-1974, Section 5.2.2 will be capable of transmitting sufficient energy to start and operate all required loads.

2. Codes and Standards This modifi::::ation has been designed in accordanre with and meets the requirements of IEEE Standard 308-197Lf for Class IE distribution system capac~ty, independence,*

auxiliary devices, and feeders.

The new load centers meet the seismic qualification re-quirements for Class IE equipment of IEEE Standard 3Lf4-1971.

3. Redundancy~ Diversity, and Separation The modified system is consistent with the existing system design and with the design bases stated in the FSAR, as concerns redundancy, diversity, and separation, and meets the requirements of IEEE Standard 308-1974 for distribution

. system redundancy and separation.

c. Schedule* for Implementation The modification to Unit 1 is essentially complete. The modification to Unit 2 is expected to be complete by July 15, 1979.

e e IV. TEST PROGRAM A. Installation Testing Specific electrical tests are required in steps of the Final Design Controlling Procedure for this modification. These tests involved:

1. All insulated cables were tested for insulation resistance prior to terminating in accordance with current Vepco Electrical Installation Specifications, which are consis-tent with current industry standards and practices.
2. The load center transformers (4160V to 480V) were Doble tested under the supervision of a.n ITE factory technician prior to shipment. The transformers also were Doble tested in place prior to being energized.
3. High potential dielectric withstand tests were performed on all 4,160 volt cables prior to termination.
4. Phase rotation sequence for the load centers and motor control centers were recorded before any bus outages.

After completion of the modHic.ation phase rotation was again taken to verify that it had not been altered.

5. The 480V breakers for the new load center were electrically tested and inspected in accordance with the vendors instruc-tion manuals and the station 1 s periodic tests for 480V breakers.

B. Functional Testing of the Load t"'.enters

1. A furctional test of the existing and new load center will be performed by operating as many of the connected loads as possible, using station procedures. As many loads as practical will be maintained on the.load centers at the same time as an additional check of operability .

. Appropriate system voltage checks will be recorded.

I_ - --

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APPENDIX A TABULATION OF LOADS 480V EMERGENCY POWER SYSTEM SURRY - UNIT l

  • e 480V UNIT SUBSTATION "lH" TABULATION OF LOADS lI

\ I:'

BREAKER UNIT SUBSTATION lH NO. DESCRIPTION OF LOAD 14Hl Incoming Line, 1600A 14H2 Pressurizer Heater; 250 Kw 14H3 LHSI Pp, 1-SI-P-lA; 250 Hp 14H4 Inside Recirc Spray Pp, 1-RS-P-lA; 300 Hp 14H5 Containment Spray Pp, 1-CS-P-lA, 250 Hp.

14H6 MCC lHl-1 14H7 Outside Recirc Spray Pp, l-RS-P-2A; 300 Hp 14HB Containment Recirc Fan, 1-VS-F-lA; 125 Hp 14H9 Future 14Hl0 MCC lHl-2 .

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e 480V UNIT SUBSTATION-~lH" TABULATION OF LOADS SECTION MOTOR CONTROL CENTER lHl-1 NO. DESCRIPTION OF LOAD 1-C

  • Feeder to MCC lHl-lA (See Page 4) 1-D Control Room Emerg Supply Fan l-VS-F-41 1-E Charging Pump Service Wtr Pp 1-SW-P-IOA 1-F Computer Feeder Back-up 1-F 480V Pwr Receptacle 2-D Radiation Monitoring (2-5KVA XFMRS) 2-D Vital Bus (1-lO~'VA XFMR) 3-D Control and. Relay Room A/C Cond. Pp 4-A Chilled Wtr A/C 1-VS-AC-l 4-A Chilled Wtr A/C l-VS-AC-7 4-B Chilled Wtr A/C 2-VS-AC-7 4-B Chilled Wtr A/C 2-VS-AC-9 4-E A/C Chiller Pp l-VS-P-2A 5-A Control and Relay Room Wtr Chiller l~VS-E-4A 5-B Battery Charger lA-1 5-B Battery Charger lA-2 5-C Charging Pp Cooling Wtr Pp l-CC-P-2A 5-D Emerg Generator Fuel Oil Pp 1-EE-P-lA 5-E Heat Tracing (1-30 KVA XFMR) 6-A Safeguards Cond Pp l-HS-P-3B 6-E Relay Room Emerg Supply Fan l-VS-F-42 7-D Seal Oil Back-up Pp 8-C Heat Tracing (l-15KVA XFMR) 8-C Heat Tracing (l-30KVA XFMR) 8-D Turning Gear

480V UNIT SUBSTATION "lH" TABULATION OF LOADS SECTION MOTOR CONTROL CENTER lHl-2 NO. DESCRIPTION OF LOAD SOUTH 2-D Boron Inj Tank Heater l-Sl-TK-2 4-D Control and Relay Room Group No. 2 5-Dl 480V Power Receptacle 5-D2 Aux Bldg Elevator 6-D Hydrogen Recombiner A 9-A Gaseous Waste Blower l-GW-C-3A 10-A Boric Acid Trans Pp l-CH-P-2A 10-B Aux Bldg Centra Are* Exhaust Fan, 1-VS-F-BA NORTH 1-D -: Charging Pp Aux Oil Pp 1-CH-P-lA 2-A Aux Feedwater Pp Motor Heater 2-D Containment Vacuum Pp 1-CV-P-lA 3-A 3-B Emerg Generator Fuel Oil Pp 1-EE-P-lD Gaseous Waste Blower l-GW-C-2A 3-D Containment I.A. Comp l-IA-C-3A

. ~

. ' 4-A Safeguard Area Sump Pp 1-DA-P-lA

'. it 4-D Recirc Spray Pp Motor Htr

,r. 5-A

' Cont Spray Pp Motor Htr 5-D Safeguards Area Exh Fan l-VS-F-40A 6-A LHSI* Pp Motor Htr 6-D Recirc Spray Pp Motor Htr 7-A Boric Acid Tank A Htr 7-D Boric Acid Tank B Htr 8-Dl 4KV Bus lJ Heater 8-D2 Incore Instrument Drive D 10-D Emerg F.W. Make-up Pp l-FW-P-4A 11-B Control Rod Cooling Fan l-VS-F-60A 1-C Control Rod Cooling Fan l-VS-F-60F

e 480V UNIT SUBSTATION "IR" TABULATION OF LOADS SECTION MOTOR CONTROL CENTER IHI-IA NO. DESCRIPTION OF LOAD 1-A Incoming Line Section 1-B Space 1-C Air Compressor No. I 1-D Air Compressor No. 2 1-El Battery Charger l-E2 Diesel Generator Control Cab.

l-D2 480V Power Receptacle 1-Fl Lighting Cabinet (I-7.5 KVA XFMR)

......~---

e f

480V UNIT SUBSTATION "lJ" TABULATION OF LOADS

~ i BREAKER UNIT SUBSTATION lJ NO. DESCRIPTION OF LOAD

14Jl Incoming Line, 1600A
f
r

'r' .

. r, 14J2 14J3 Spare LHSI Pp, 1-SI-P-lB; 250 Hp

'. i

~ ~

14J4 Inside Recirc Spray Pp, 1-RS-P-lB; 300 Hp I.'

~

14J5 Containment Spray Pp, 1-CS-P-lB, 250 Hp 14J6 MCC lJl-1 (See Page 2) 14J7 Outside Recirc Spray Pp, l-RS-P-2B; 300 Hp 14J8 Containment Recirc Fan, 1-VS-F-IB; 125 Hp

';* i:

': 14J9 Pressurizer Heater, 200Kw

t n

14Jl0 MCC lJl-2 (See Page 3)

480V UNIT SUBSTATION II lJ~'

  • TABULATION OF LOADS SECTION MOTOR CONTROL CENTER lJl-1 NO
  • DESCRIPTION OF LOAD
I!

I 1-C 2-Al Turning Gear Motor Vepco Test Equip Reep 2-A2 Heat Tracing XFMR Cab 2, 30 KVA 2-B Roadway Lighting 3-Al Rad Monitoring 3-A2 Vital Bus 1-IV FDR 3-Bl Low Pressure co Sys Refrig 2

3-B2 RSS Trans Cooling Fans 4-B Gen Brg Lift Pump 4-C Charging Pp Service Wtr Pump 4-D Emer Gen F.O. Pump 1-EE-P-lC 4-E Charging Pp Cooling Wtr Pump 5-Cl Batt Chgr lB-1 5-C2 Batt Chgr lB-2 5-D Spare 5-E Safeguards Duplex Cond Pump 1-HS-P-3B 6-A Cont and Rel Rm A/C Cond Pp 1-VS-P-lB 6-B A/C Chiller Pump l-VS-P-2B 6-C Cont and Rel Rm Wtr Chlr 6-D Charging Pp Aux Oil Pp 1-CH-P-lB

      • 6-E MCC lJl-lA Gen Rm No. 3 7-Dl Semi-Vital Bus Feeder 7-D2 FDR 30 KVA Heat Trace XFMR Cab 9 8-D2 FDR 15 KVA Heat Trace XFMR Cab 4

480V UNIT SUBSTATION "lJ".

TABULATION OF LOADS SECTION MOTOR CONTROL CENTER 1J2-2 NO. DESCRIPTION OF LOAD EAST II t 1-D Cont Air Compressor r

/*'

f 2-A Inst Air Compressor 3-B Cont Vac Pp 1-CV-P-lB 3-C Cont Spray Pp Mtr Htr 1-CS-P-lB 3-D Safeguards Area Sump Pp 1-DA-P-lB 3-E Stm Gen Aux Fd Pump Mot Htr l-FW-P-3A 4-D Recirc Spray Pp Mtr Htr 1-RS-P-lB D Recirc Spray Pp Mtr Htr 1-SI-P-lB I

6-D Hydrogen Rec B f 7-D Lo Hd Saf Inj Mot Htr 1-SI-P-lB f r'

,, 8-D Recirc Spray Pp Mot Htr 1-RS-P-2B

'f ti

~* ;- 9-C Boric Acid Tk Htr l-CH-E-6C 1 .

9-Dl 4Kv Swgr Bus H Htr FDR 9-D2 Incore Inst Drive "E" 10-C Control Rod Drive Cooling Fan 1-VS-F-60C WEST 1-Dl Personnel Hatch l-D2 Mn Air Dryer 1-IA-D-l 2-D Charging Pp Aux Oil Pump 1-CH-P-lC 3-D Boron Inj Tank Htr l-SI-TK-2 4-D2 Cont Air Compressor Dryer l-lA-D-2 6-B Emer Make-Up Pp l-FW-P-4B 8-D Control Rod Drive Cooling Fan l-VS-F-60D 9-D Blower l-GW-C-3B 9-E Safeguards Supply HV Unit l-VS-HV-4 10-B Boric Acid XFER Pump 10-C Aux Bldg Central Exh Fan 1-VS-F-SB L

e I

I . 480V UNIT SUBSTATION "l.J" TABULATION OF LOADS SECTION MOTOR CONTROL CENTER lJl-lA NO. DESCRIPTION OF LOAD 1-A Incoming Line 1-B Filler 1-C Space 1-D Air Compressor No. 1 1-El Diesel Generator Control Cab.

l-E2 -. Spare 1-Fl Battery Charger l-F2 480V Power Receptacle 2-A Space 2-:B Air Compressor No. 2 2-C Space 2-Dl Lighting Cabinet 1S9 2-D2 Lighting Cabinet lSlO

e A,Ependix Q Loading Sequence Post LOCA

LOCA e

  • CASE I HALF OF OPERATOR SELECTED LOAD ON*EACH BUS (lH, lJ)

BUS lH LOAD IN KVA 15 Sec 120 Sec. 300 Sec. Loads MCC lHl-1 169 169 169 MCC lHl-2 275 275 275 C LHSI lA 223 223 223

' i

t Cont Spray 225 225 225

' i Inside RS 277 277

i \ Outside RS 277 iI , I
1 KVA Total Load 892 KVA 1169 'KVA 1446 iI I Corres. Current 1120 AMPS 1467 AMPS 1814 AMSP
! From !TE Breaker Trip Curve
Min Trip - 520 sec; Max Trip -

l,, l QO

[:.

! BUS lJ LOAD IN KVA q

q' .

I *

' I j.. l 15 Sec. 120 Sec. 300 Sec+ Loads

' ~
' !. MCC lJl-1 310 310 310 MCC lJl-2 220 220 220 B LHSI lB 223 223 223 Cont Spray 225 225 225 Inside RS 277 277 Outside RS 277

[ [

r' :I Total Load 978 KVA 1255 KVA 1532 KVA

' ' Corres. Current 1227 AMPS 1575 AMPS 1922 AMPS H t {

f:: From !TE Bkr Trip Curve; Min Trip 320 sec; Max Trip 700 sec.

f

'f

e LOCA CASE II MAXIUM LOAD ON BUS lH MINIMUM LOAD ON BUS lJ BUS lH LOAD IN KVA 15 Sec 120 Sec 300 Sec Loads*

MCC lHl-1 299 299 299 A MCC lHl-2 275 275 275 C LHSI 223 223 223 Cont Spray 225 225 225 Inside RS 277 277 Outside RS 277 t

[;

Total 1022 KVA 1299 KVA 1576 KVA Corres. Current 1282 AMPS 1630 AMPS 1978 AMPS From ITE Bkr Curve: Min Trip 290 sec; Max Trip 550 sec BUS lJ LOAD IN KVA 15 Sec 120 See 300 Sec+ Loads*

MCC lJl-1 180 180 180 MCC lJl-2 220 220 220 LHSI 223 223 223 Cont Spray 225 225 225 Inside RS 277 277 Outside RS 277 Total 848 KVA 1125 KVA 1402 KVA Corres. Current 1064 AMPS 1411 AMPS 1759 AMPS From ITE Bkr Curve: Min Trip 400 sec; Max Trip 00sec.

(1) Load current based on equip. nampeplate volt= 460 volts

  • A= l-VS-E-4A, l-VS-P-2A, 1-VS-P-lA B = Control Rod Cooling Fans 60C, 60D C= Control Rod Cooling Fans 60A, 60F D = l-VS-E-4B, l-VS-P-2B, 1-VS-P-lB

e

  • LOCA CASE III MAXIMUM LOAD ON BUS lJ MINIMUM LOAD ON BUS lH BUS lH LOAD IN KVA 15 Sec 120 Sec 300 Sec+ Loads I

i; MCC lHl-1 169 169 169 f' 128

~ f MCC lHl-2 128 128

.t t* ~

F.'.

LHSI Cont Spray 223 225 223 225 223 225 Inside RS 277 277 Outsider RS 277 f~

it r:

Total KVA 745 KVA 1022 KVA 1299 KVA h' .. Corres. Current 935 AMPS 1282 AMPS 1630 AMPS lit5.

,; From ITE Bkr Trip Curve: Min Trip 470 sec; Max Trip - oO t~

fl'~

ff

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~* !.

BUS lJ LOAD IN KVA

~- .

rf

15 Sec 120 Sec 300 Sec+ Loads F

MCC lJl-1 310 310 310 D MCC lJl-2 367 367 367 B LHSI 223 223 223 Cont Spray 225 225 225 t'! Inside RS 277 277

~l Outside RS 277

~tf:

t;f*

f'.' Total Load 1125 KVA 1402 KVA 1679 KVA Corres. Current

  • 1412 AMP 1760 AMPS 2107 AMPS From ITE Bkr Trip Curve: Min Trip 250 sec; Macx Trip 500 sec

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,--,-,--.-;:,..;..:;..:..:..-1 TITLE CHECKED I O N E. L, 1-lE ' l:>1i)..<=4RJ...i,,\ . I SCALE: NONE CORRECT -48D I/ E.ME.~. V"~E.~ S'('STEl'I\ DATE: 41'1(""11 I APPROVEO REVISIONS@

~ 1/f/'17 I l@L .1@1 ISKETCH NUMBER l@IIZB4',Z3-£K.6.:"'.J..-:J.

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AGENDA

  • Meeting with NRC and VEPCO May 3, 1979 on l180V Emergency Power System Analysis and Hodification for Surry Power Station Units 1 and 2.

A. Background B. Descripti.on of Existing 480V Emergency Power System C. Description of Modification D. Test Program E. Classification of Modification

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