ML20033C813

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Verification of ESF Switchgear Voltage Levels
ML20033C813
Person / Time
Site: Summer 
Issue date: 06/08/1981
From:
SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML20033C812 List:
References
ES-01-E56, ES-1-E56, NUDOCS 8112040314
Download: ML20033C813 (21)
v • d • e


Text

b Nichols to Denton Letter November 30, 1981 SOUTH CAROLINA ELECTRIC AND GAS COMPANY VIRGIL C.

SUMMER NUCLEAR STATION START-UP PHASE I INSTRUCTION VIAS ER TEST COPY FOR INFORMADON ONU VERIFICATION OF ESF SWITCHGEAR VOLTAGE LEVELS ES-01-E56 REVISION O JUNE 2, 1981

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Safety Relater (X)

(vii 6d. C]

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WRITTEN BY:

FATE b

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APPROVED BY:

LEAD SYSTEM SUPERVISOR DATE TEST DATA APPROVED BY:

LEAD SYSTEM SUPERVISOR DATE

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SUM-C 1096-1

'EV. 0 8112040314 811130 PDRADOCK05000g

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LIST OF EFFECTIVE PAGES PAGE REVISION 1096-1 0

1096-1A 0

1096-1B 0

1096-2 0

1096-3 0

1096-4 0

1096-5 0

1096-6 0

1096-7 0

1096-8 0

1096-9 0

1096-10 0

1096-11 0

1096-12 0

ATTACHMENTS Table 8D-1 Attachment I i

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Attachment II -

Table 8D-2 i

Attachment III - Table 8D-3 Attachment IV

- Table 8D-4 l

l REVISION NO.

APPROVAL DATE G

6,-T-W/

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SUM-C 1096-1A REV.0 i

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INDEX VERIFICATION OF ESF SWITCHGEAR VOLTAGE LEVELS 1.0 PURPOSE-2.0 SCOPE 30 PREREQUISITES 4.0 INSTRUCTIONS ATTACHMENTS Attachment I - FSAR Volume X - Table 8D-1

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Attachment II - FSAR Volume I - Table 8D-2 Attachment III-FSAR Volume X - Table 8D-3 Attachment IV - FSAR Volume X - Table 8D-4 s

SUM-C 1096-1B REY. O u

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1.0 PURPOSE

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1.1 This procedure in conjunction with FSAR Appendix 8D will be used to verify the proper voltage levels on the ESF switchgear.

2.0 SCOPE 2.1 Voltage and load readings to be taken on the following Transmission lines and buses:

2.1.1 115 KV Safeguards Line 2.1.2 230 KV Bus 2.1 3 7.2 KV Bus ISW 1 Di.

2.1.4 480 V Bus XSW 1DAl 2.1 5 480 V Bus XSW 1DA2 2.1.6 480 V Bus XMC 1DA2X 2.1.7 480 V Bus XMC 1DA2Y 2.1.8 480 V Bus XMC 1DA2Z C',

2.1 9 7.2 KV Bus ISW 1 DB w

2.1.10 480 V Bus XSW 1DB1 2.1.11 480 V Bus XSW 1DB2 2.1.12 480 V Bus XMC 1DB2X 2.1.13 480 V Bus XMC 1DB2Y 2.1.14 480 V Bus XMC 1DB2Z c v **i awyse 2.1.15 480 V Bus XMC 1g(1X

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  • l 2.1.16 480 V Bus XMC 1E/1X w-([cs,El 2.1.17 480 V Bus XMC 1EC1X

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  • E f, 4&c G,s xy iggo 30 PREREdDISITES48 y C"'

x)" esat 31 Verification of transformer tap settings as specified in Table 5 of FSAR Appendix 8D and SFR 2955 32 Notify shif t supervisor and have switchgear fed from the offsite source as specified in this procedure.

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SUM-C 1096-2 REV. O

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33 Assure that the work will be performed using the' late,st copy of this procedure.

4.0 INSTRUCTIONS 4.1 General 4.1.1 All voltage readings will be taken across all three phases with a Fluke digital voltmeter. In the case cf the light load condition, the highest voltage reading will only be recorded on each of the buses. In the case of the accident load condition, the lowest voltage readings will only be recorded. The 7.2 KV bus voltage readings will be taken'from the 7.2 KV bus pots (60/1 ratio).

The 480 V Bus voltage readings will be taken from )kL the load breaker stabs and the MCC bus voltage readings will be taken from the incoming line sections.

4.1.2 Current readings on the 7.2 KV Switchgear will be taken from the bus ammeters located on the switchgear with a clamp on ammeter (clamped on ammeter leads). This will be CT secondary current.

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Actual bus current will be clamp on ammeter reading times CT ratio.

'480 V Switchgear ammeter readings will be taken from the Delta CT's 6oing to stud 6 of the 87T d " f

,f h Transformer differential re2ays (located on g

Cubicle 3) of the 480 V ESF Transformers. Actual

,rg buscurrentwil[lbeclampenammeterreadingtimes cd

  • 1 CT ratio t4*s do.I,4J by 4.1 3 Voltage readings of the 230 KV Bus #1 and the 115 KV Parr ESF line will be re:orded for both the i

accident load and light load conditions prior to l

recording voltages and currents on the ESF switchgear.

I 4.1.4 Accident loads will be fed from the 115V line via f

XTF4 and XTF5 (parallel together) and with both l

7.2 KV buses 1DA and 1 DB fed from this system.

Next the 7.2 busses 1DA and 1DB will be fed from the 230 KV System via transformer XTF31 and 30P bus IC being fed from the same transformer.

For light loads only one bus (the bus under test) will be tied to the particular line being monitored.

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i SUM-C 1096-3 REV.2

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4.2 Usin6 data sheets attached to this procedure for the various conditions ao described in appendix 8D of the FSAR, fill out the data sheets with the load on the switchgear as close as possible to load list of letter' CGGS-23395 NOTE:

Light.oad conditions will be taken under shutdown conditions. Accident conditions will be recorded during Safeguards testing following a simulated Safety Injection.

43 Instrument used in recording current will be an Amprobe Model ACD-1 Accuracy 3% 0-10 amps and 2.5% 100-800 amps.

Instrument used in recording voltage will be a digital voltmeter - Fluke Model 8600A. Accuracy.23% @ 100V and 31% @ 1000V.

4.4 Voltage levels must not exceed calculated voltages of attachments I and II nor be below ce]culated voltages of attachments III ans IV.

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i SUM-C l

1096-4 REV.0

r ESF TRAIN "A" LIGHT LOAD CURRENT AND VOLTAGE READINGS

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FED FROM TRANSFORMERS XTF4 and XTFS CT PT Ecuipment Ratio Ratio Current Calculated Actual Current Voltage 115KV Line 1000/1 ISU 1DA 200/1 60/1 45.3 XSU 1DA1 600/1 398.5 XSU 1DA2 400/1 270.6 XMC 1DA2X

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XMC 1DA2Y XNC 1DA2Z ISU 1EA1 240/1 '

21.65 XMC 1EA1X XMC 1EC1X

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  • Eml-tiply readings tr4+y 4s TEST EQUIPMENT CAL DUE DATE COMMENTS:

Performed By:

System Test Supervisor Approved by Lead System Supervisor

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SUM-C 1096-5 REV.0

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ESF TRAIN "B" LIGHT LOAD CURRENT AND VOLTAGE READINGS FED FROM TRANSFORMERS XTF4 and ITF5 CT PT Equipment Ratio Ratio Current Calculated Actual Current Voltage 115KV Line 1000/1 XSU 1DB 200/1 60/1 39.5 XSU 1DB1 600/1 388.5 XSU 1DB2 400/1 187.6 XMC 1DB2X XMC 1DB2Y XMC 1DB2Z XSU 1EB1-240/1 16.84 XMC 1EB1X XMC 1EC1X j

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o #:ltiply readings ti_y

/3 Tcd

  • 3

.es 3

TEST EQUIPMENT CAL DUE DATE i

COMMENTS:

Performed By:

Systec Test Supervisor 2

Approved by Lead System Supervisor I

SUM-C 1096-6 REV.O

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ESF TRAIN "A" LIGHT LOAD CURRENT AND VOLTAGE READINGS FED FROM TRANSFORMER XTF31 CT PT Eauiument Ratio Ratio Current Calculated Actual Current Voltage 230XV Line 2000/1 XSU 1DA 200/1 60/1 45.3 XSW 1DA1 600/1 388.5 XSU 1DA2 400/1 270.6 XMC 1DA2X XMC 1DA2Y XMC 1DA2Z XSW 1EA1 240/1 21.65 XMC 1EA1X XMC 1EC1X p]./jd w b

o Multiply readings 'd 8 Tc - # 3)

TEST EQUIPMENT CAL DUE DATE COMMENTS:

Performed By:

j System Test Supervisor Approved by Lead System Supervisor i

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SUM-C 1096-7 REV.0 l

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ESF TRAIN "B" LIGHT LOAD CURRENT AND VOLTAGE READINGS FED FROM TRANSFORMER XTF31 CT PT Eauipment Ratio Ratio Current Calculated Actual Current Voltage f:30KV Line 2000/1 XSW 1DA 200/1 60/1 39.5 XSU 1DA1 600/1 388.5 XSW 1DA2 400/1 187.6 XMC 1DA2X XMC 1DA2Y

-XMC 1DA2Z XSU 1EA1 2,40/1 16.84 XMC 1EA1X XMC 1EC1X

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D ;secl =

67 i-i o =& irl.: readings % g Tu 4 3 1 TEST EQUIPMENT CAL DUE DATE l

l COMMENTS:

Per. formed By:

System Test Supervisor Approved by Lead System Supervisor l

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l SUM-C l

1096-8 REV.0-l.

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ESF TRAIN "A" ACCIDENT 10AD-CURRENT AND VOLTAGE READINGS-

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FED FROM TRANSFORMERS XTF4 and XTF5, 7,

s.

CT PT s

Ecuipment Ratio Ratio-Current Calculated Actual Current Voltage i

115KV Line 1000/1 XSU 1DA 200/1 60/1 194.13 X80 1DA1 600/1 1492.7 XSU 1DA2 400/1 1279.8 XMC 1DA2X XMC 1DA2Y XMC 1DA2Z XSU 1EA1 240/1 139.53 XMC 1EA1X XMC 1EC1X

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0,6..d=

6 o J'ultiply readings -ti[cc- [ (Tees

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TEST EQUIPMENT CAL DUE DATE COMMENTS:

Performed By:

System Test Supervisor Approved by Lead System Supervisor SUM-C 1096-9 REV. 0_

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. USF TRAIN "B"' ACCIDENT LOAD CURRENT AND V0TAGE READINGS trD FROM TRANSFORMERS XTF4 and XTF5 e

O CT PT Eauitment.c, Ratio Ratio Current Calculated Actual Current Voltage i

J 15KV Line 1000/1 XSV 3DB 200/1 60/1 195.82 XSW 1DB1 600/1 1686.34 XEW 1DB2 400/1 1057 3 XMC 1DB2X XMC 1DB2Y XMC 1DB2Z XSU 1EB1 240/1 196.0 XMC 1EB1X XMC 1EC1X

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  • 7)

TEST EQUIPMENT CAL DUE DATE l

COMMENTS:

Performed By:

System Test Supervisor Approved by Lead System Supervisor i

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.I SUM-C 1096-10 REV.0 l

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ISF TRAIN " A" ACCIDENT LOAD CURRENT AND VOLTAGE READINGS FED FROM TRANSFORMER XTF31 CT PT Eouipment Ratio Ratio Current Calculated Actual Current Voltage 230KV Line 2000/1 XSU 1DA 200/1 60/1 194.15 XSW 1DA1 600/1 1492.7 XSU 1DA2 400/1 1279.8 Xf4C 1DA2X XMC 1DA2Y IMC 1DA2Z XSW 1EA1 240/1 139.53 i'

_XMC41EA1X XMC 1EC1X X""

1 C 400/1 1477.5 v

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b o "ultipip readings ti$cc- [

JTcw -m 3 TEST EQUIPMENT CAL DUE DATE COMMENTS:

l Performed By:

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t System Test Supervisor l

ApprovedbylLeadSystemSupervisor l

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SUM-C 1096-11 REV.0 L

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ESF TRAIN "B" ACCIDENT LOAD CURRENT AND VOLTAGE READINGS FED FROM TRANSFORMER XTF31 I

CT PT Equirment Ratio Ratio Current Calculated Actual, Current Voltage 230KV Line 2000/1 XSU 1DB 2C0 /1 60/1 195.82 XSU 1DB1 600/1 1686.34 t

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ISW 1DB2 400/1 1057.3 XMC,1DB2X XMC 1DB2Y

  • XMC 1DB2Z XSW 1EB1 240/1 196.0 XMC 1EB1X XMC 1EC1X l '-

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104 1 C 400/1 1477.5 o".ul$[1 readings

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TEST EQUIPMENT CAL DUE DATE COMMENTS:

Performed By:

l System Test Supervisor Approved by Lead System Supervisor

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SUM-C i

1096-12 REV.0 t

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T ATTACHMENT I PAGE 1 of 1

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TABLE 8D-1 Calculated Voltage Levels on ESF System Buses Conditions a

Leading:

Light load for bus 1DA or 1 DB b

Source:

Two ESF transformers in parallel c

Voltage:

Ascume motor terminal volta 6e at 110 percent of motor voltage rating.

Resultant Voltage Levels Voltage Percent of Calculated Point Calculated Nominal Bus Voltage a) 115kV Transmission Line 119 35kV 103 79 b) 7.2kV Bus XSW1DA 7.46kV 103.69 c) 6 9kV Motor Terminal None Running d) 480V Bus XSW1DAl 505 5V 105 32 e) 480V Bus XSWlDAl 505.lv 105 23 f) 480V Bus XMC1DA2X 504.8V 105 18 g) 480V Bus XMC1DA2Y 504.4V 105 09 h) 480V Bus XMC1DA2Z 504.6V 105 14 i) 460V Motor Terminal 506.0V (110 of Motor

(

Nominal Rating) j) 7 2kV Bus XSWlDB 7.46kV 103.69 k) 6.9kV Motor Terminal None Running

1) 480V Bus XSW1DB1 505 4V 105 3 m) 480V Bus XSW1DB2 506.0V 105.42 n) 480V Bus XMC1DB2X 505 7V 105 36 o) 480V Bus XMC1D$2Y 505 5V 105 32 p) 480V Bus XMClDB2Z 505.7V 105 36 q) 460V Motor Terminal 506.0V (110 of Motor Nominal Rating) r) 7.2kV Bus XSWlEA 7.46kV 103 69 s) 6.9kV Motor Terminal None Running t) 480V Bus XMClEAlX 497 2V 103 59 u) 460V Motor Terminal None Running v) 7.2 KV Bus IEB 7.46KV 103 69 w) 6.9kV Motor Terminal None Running x) 480V Bus XMC-1EBlX 497.2V 103 6 y).460V Motor Terminal None Running AMENDMENT 22 NOVEMBER, 1980 t

SUM-C 1096-13 REV.0

T ATTACHMENT II PAGE 1 of 1 b

TABLE 8D-2 Calculated Voltage Levels on ESF System Buses Conditions a)

Loading:

Light load for bus lI A or 1 DB b)

Source:

Emergency auxiliary transformer c)

Voltage:

Assume motor terminal voltage at 110 percent of motor voltage rating.

Resultant Voltage Levels Voltage Percent of Calculated Point Calculated Nominal Bus Voltage a) 230kV Bus 238.7kV 103 795 b) 7.2kV Bus XSWlDA 7.46kV 103 69 c) 6.9kV Motor Terminal None Running d) 480V Bus XSW1DAl 505 5V 105 32 e) 480V Bus XSWlDA2 505 1V 105.23 f) 480V Bus XMC1DA2X 504.8V 105.18 g) 480V Bus XMC1DA2Y 504.4V 105.09 h) 480V Bus XMC1DA2Z 504.6V 105 14

1) 460V Motor Terminal 506.0V (110 of Motor
f.,

(_.,

Nominal Rating) j) 7.2kV Bus ISW1DB 7.46kV 103.69 k) 6 9kV Motor Terminal None Running

1) 480V Bus XSW1DB1 505 4V 105 3 m) 480V Bus XSW1DB2 506.0V 105 42 n) 480V Bus XMC1DB2X 505 7V 105 36 o) 480V Bus XMC1DB2Y 505.5V 105 32 p) 480V Bus XMC1DB2Z 505 8V 105 38 q) 460V Motor Terminal 506.0V (110 of Motor Nominal Rating) r) 7.2kV Bus XSWlEA 7.46kV 103.69 s) 6 9kV Motor Terminal None Running t) 480V Bus XMC1EA1X 497 2V 103.59 u) 460V Motor Terminal None Running v) 7.2KV Bus XSW1EB 7.46KV 103 69 v) 6.9kV Motor Terminal None Running x) 480V Bus XMC1EBlX 497 2V 103 6 i

y) 460V Motor Terminal None Running AMMENDMENT 22 NOVEMBER, 1980

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4 SUM-C 1096-14 REV.0

F ATTACHMENT III PAGE 1 of 1

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TABLE 8D-3 Calculated Voltage Levels on ESF System Buses Conditions a)

Loading:

Accident load for bus 1DA or 1DB b)

Source:

Two ESF transformers in parallel c)

Voltage:

Assume motor terminal voltage at 90 percent of motor voltage rating.

Resultant Voltage Levels Voltage Percent of Calculated Point Calculated Nominal Bus Voltage a) 115kV Transmission Line 109 0kV 94.79*

b) 7.2kV Bus XSW1DA 6 57kV 91 34 c) 6.9kV Motor Terminal 6.57kV 95 31 of Motor Nominal Rating d) 480V Bus XSW1DA1 433 3v 90.29 e) 480V Bus XSW1DA2 421.8v 87.89 f) 480V Bus XMC1DA2X 421.ov 87 72 g) 480V Bus XMC1DA2Y 419.8v 87.46 h) 480V Bus XMClDA2Z 416.6v 86.8 i) 460V Motor Terminal 414.0v (90.0 of Motor

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Nominal Rating) j) 7.2kV Bus XSW1DB 6.57KV 91 34 k) 6.9kV Motor Terminal 6 57KV (95 31 of Motor Nominal Rating)

1) 480V Bus XSW1DB1 430 9V 89.78 m) 480V Bus XSW1DB2 427.2V 89.01 n) 480V Bus XMC1DB2X 426 5V 88.86 o) 480V Bus XMClDB2Y 424 9V 88 54 p)) 460V Motor Terminal 480V Bus XMC1DB2Z 425 0V 88 55 q

420.8V (91.49 of Motor j

Nominal Rating) i r) 7.2kV Bus XSW1EA 6.57kV 91.26 s) 6 9kV Motor Terminal 6.57kV (95 23 of Motor Nominal Rating) t) 480V Bus XMC1EA1X 434.6V 90.56 l

u) 460V Motor Terminal 433 9V (94 33 of Motor l

Nominal Rating) v) 7.2kV Bus XSW1EB 6 57KV 91.27 w) 6 9kV Motor Terminal 6 57KV 95 24 of Motor Nominal Rating x)'480V Bus XMC1EBlX 430.0V 90.42 y) 460V Motor Terminal 432.8V 94.09 of Motor Nominal Rating AMENDMENT 22 NOVEMBER, 1980

  • 3ncludes 1 1/2% relay tolerance.

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l SUM-C 1096-15 REV.0 l

o ATTACHMENT IV PAGE 1 of l'

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TABLE 8D-4 Calculated Voltage Levels on ESP System Buses Conditions I

a)

Loading:

Accident load for bus 1DA or IDB b)

Source:

Emergency Auxiliary Transformer c)

Voltage:

Assume motor terminal voltage at 90 percent of motor voltage rating.

Resultant Voltage Levels Voltage Percent of Calculated Point Calculated Nominal Bus Voltage a) 230kV Bus 218.9kv 95 21*

l b) 7.2kV Bus XSWlDA 6.57kv 91 34 i

c) 6.9kV Motor Terminal 6.57kv 95 31 of Motor Nominal Rating d) 480V Bus XSWlDA1 433 3v 90.29 e) 480V Bus ISW1DA2 421.8v 87.89 f) 480V Bus IMC1DA2X 421.0V 87.72 g) 480V Bus XMC1DA2Y 419.8V 87.46 h) 480V Bus XMCkDA2Z 416.6V 86.8 i) 460V Motor Terminal 414.0V 90.0 of Motor (j

Nominal Rating j) 7.2kV Bus ISW1DB 6 57kV 91 34 k) 6.9kV Motor Terminal 6.57kV 95 31 of Motor Nominal Rating

1) 480V Bus XSW1DB1 430 9V 89 78 m) 480V Bus ISW1DB2 427.2V 89 01 g

n 480V-Bus XMC1DB2X 426 5V 88.86 o

480V Bus XMC1DB2Y 424 9V 88.54 p

480V Bus XMClDB2Z 425.0V 88.55 q

460V Motor Terminal 420.8V 91.49 of Motor Nominal Rating r) 7.2kV Bus XSW1EA 6.57KV 91.26 s) 6 9kV Motor Terminal 6.57KV 95.23 of Motor Nominal Rating

) 480V Bus XMClEA1X 434.6v 90 56 u) 460V Motor Terminal 433 9v 94 33 of Motor Nominal Rating v) 7.2KV Bus XSW1EB 6 57KV 91.27 v) 6.9kV Bus XSWlEB 6.57kV 95 24 of Motor Nominal Rating x) 480V Bus XMClIB1X 430.0V 90.42 l.

y) 460V Motor Terminal 432.8V 94.09 of Motor l

Nominal Rating

  • Includes 1 1/2% relay tolerance t

AMENDMENT 22 NOVEMBER, 1980 SUM-C 1096-16 REV. O.

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7 Nichols to Denton Letter CONDITIONS Page 1 of 2 November 30, 1981 1.

Loading:

Simulated Saf ety Injection Signal Load f or Buses 1DA-1DB per Test Procedure SUM-C-1096 Subsystem ES01-E56 2.

Source:

Emergency Auxiliary Transformer Calculated Measured Calculated ~as Compared with.

Bus Voltage Voltage Measured Voltage 230KV 229.58 229.58 1DA 7074.06V 7112.4V

.54% lower 1DA1 471. 99V 475. 3V

.7% lower 1DA2 471.75V 474.6V

.81% lower 1DA2X 471.46V 463. 6V

.45% lower 1DA2Y 470.93V 475.97 1.04% lower 1DA2Z 470.4V 473.lv

.57% lower 1EA1 469. 96V 471.57

.33% lower 1EA1X 469.76V 471.37

.33% lower t,

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1DB 7074.067 7110V

.5% lower 1 dbl 471.5V 477.2 V 1.19% lower 1DB2 472.1SV 473.2 V

.22% lower 1DB2X 471. 86V 473.1 V

.26% lower IDB2Y 471.18V 474.5 V

.7% lower 1DB22 471.14V 473.6 V

.52% lower i

1EB1 469.9V 472.2V

.49% lower 1EB1X 469.6IV 472.1 V

.53% lower i

l b

e

c Nichols to Denton Letter Page 2 of 2 November 30, 1981 CONDITIONS 1.

Loading:

Simulated Safety Injection Signal Load for Buses IDA-IDB per. Test Procedure SUM-C-1096 Subsystem ES01-E56 2.

Source:

Two ESF Transformers in Parallel Calculated Measured Calculated as Compared Bus Voltage Voltage With Measured 115KV ll3.59KV~

ll3.59KV 1DA(7.2kV) 7012.4 V 7009.2V

.05% higher 1DA1(480V) 469.04V 467.9V

.24% higher 15A2(480V) 470.07V 467.4V

.57% higher 1DA2X 469.86V 467.9V

.42% higher 1DA2Y 469.05V 466.6V

.53% higher 1DA22 467.67V 466.0V

.36% higher LEA) 465.85V 463.8V

.44% higher LEA 1X 465.65V 463.9V

.38% higher 1DB 7012.4V 7020V

.11% lower 1 dbl 466.07V 465.5V

.12% higher 1DB2 471.17V 466.9V

.9% higher 1DB2X 470.88V 466.9V

.85% higher 1DB2'Y 470.2V:

466.5V

.79% higher 1DB2Z 470.16V 466.3V

.82% higher 1EB1 465.79V 463.9V

.4% higher l

1EBlX 465.5 V 463.2V

.5% higher i

l i

l

i Nichols to Denton Letter November 30, 1981 EFEECP ON SYSTEM VOLTAGE m s'rms LARGEST NON-SAFETY MTOR M is test was performed during hot functional testing with the plant buses at a load representative of normal conditions.

W e largest non-safety related load is reactor coolant p ep.

Mere are three reactor coolant pumps, one on each non-safety related bus.

Ebr this test the non-safety related buses were powered frm the emergency auxiliary transformers. Se A&B pumps, powered frcm the secondaries of a three winding transformer were running. Se C pmp is I:owered from one secondary of a three winding transformer.

We other secondary feeds safeguards bus im. m en starting the C pznp, voltage recordings were made on the C pump bus, as well as both safeguards buses.

S e voltage drop on non-safety related bus 1C was 11.61% and recovered to within 1.46% of original voltage in approximately 15 seconds. m e voltage drop on safeguards bus 1DB, which was powered fr m the c.:her secondary of the transformer, was 1.22% and recovered to within.31% of original voltage in approximately 14 seconds. %e voltage drop on safeguards bus 1DA, wttich was powered frcm the 115kv system through the safeguards transformers was.35% and recovered to within.21% of original voltage in approximately 15 seconds.

Although the voltage recovery time of approximately 15 seconds exceeds the tine delay on the degraded voltage relays, an actual degraded voltage trip is not likely with the small voltage drops involved. %e degraded voltage relays will protect the safeguards buses frcm dropping below the minimum operating voltages when starting these large motors.

L m

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