Text

Forwards Response to 840626 Request for Addl Info Re 125-volt Dc Sys.Facility Recently Completed Replacement of 125-volt Battery Chargers w/200 ampere-rated Units
	ML20094J432
Person / Time
Site:	Quad Cities
Issue date:	08/01/1984
From:	Rybak B; COMMONWEALTH EDISON CO.
To:	Harold Denton; Office of Nuclear Reactor Regulation
References
	8930N, NUDOCS 8408140317
	Download: ML20094J432 (17)
	v • d • e

-

/'~~N Commonwealth Edison

(

~~ ) One Fust Natiornt P!ns. Chic 7go, Illinois 7 Address Reply to: Post Office Box 767

' \\,

/ Chicago Illinois 60690 August 1, 1984

'Mr. Harold'R. Denton,-Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington,- DC 20555

Subject:

. Quad Cities Station Units 1 and 2 Response to a Request for Additional Information 125 Volt Battery System NRC Docket Nos. 50-254 and 50-265 References (a):

D. B. Vassallo letter to D. L. Farrar dated June.26, 1984.

(b):

D. L. Farrar letter to J. G. Keppler dated May 11, 1984.

(c):

J. G. Keppler letter to D. L. Farrar dated May 7, 1984.

Dear Mr. Denton:

Per Reference (a), your staff requested additional.Informa-tion concerning the 125 Volt DC System at Quad Cities Station.

Our response is in the form of an attachment to this letter.

Please note that-our response' to Questions 3 and 4 assumes the use of a 100 ampere battery chargers, the size originally' installed.

Quad Cities Station has recently completed replacement of its 125 volt battery chargers with 200 ampere rated units.

If you have any questions regarding this matter, please contact this office.

One signed original and forty (40) copies are enclosed for your use.

Very truly yo rs, 8*

J B408140317 840001 PDRADOCK05000h B.

k P

Nuclear Lice s g Administrator 1m cc:

NRC Resident Inspector - Quad Cities R. Bevan - NRR

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kJd dd AY'l0 fx.r/AI'4 8930N 00/

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ATTACHMENT

' Response to Request-for Additional Information on' 125 Volt DC Systems

Reference:

-D.-8.'Vassallo letter to D. L. Farrar dated June 26,.-1984.

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gj Question =.1

Part'l-The'following listiincludes possible loads which may:b'e manually tripped

'in' order taireduce battery load to 62 amps after the first 30 minutes:

' Unit 1-From.125 V'DCETurbine Building Bus lA Service-345kV_ Relay House Feed-

-Escape Lighting' Panel #20

-Escape Lighting' Panel #10

. Escape-LightingLPanel'#30 s

345kV Control Panel 912-2 Turbine EHC-Main Feed Radwaste Control Panel Data Acquisition. Cabinet Relay.and-Metering-Panel-901-29 Supervisory. Master Station Panel

Protection Relay Panel 901-29 l(Main Feed)

'From 125V:DC Turbine. Building Bus 1B Protection RelayLPanel-901-29 F

'(Reserve Feed) and Inverter For--ATWS Cabinet ~ 2201-708.

-Protection Relay Panel 901-29-& ATWS Filter Cabinet 2201-708 (NOTE:- Loads to shed only after SCRAM) l From 125V DC Reactor Building' Bus #1 Escape Lighting Panel 29 V

f i

HUnit'2

[

'From 125V DC Turbine Building-Bus 2A l

Service

-_345kV Relay House Feed Escape Lighting Panel 50

. Escape. Lighting-Panel 59 L

Protection Relay Panel 902-29 (Reserve Feed)

I,-

4801D-2 l

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7-24-84

-Qunation 1- (continutd)

From 125V DC Turbine Building Bus 2B Protection Relay Panel 902-29 Back-Up Reserve Feed & AThS Inverter The loads ~ associated with the above services are-all non-safety related and.are not used to mitigate the consequences of an accident.

Part 2 The Attachment A and associated cell sizing calculation worksheet shows.that without any manual load shedding the battery will last approximately two hours.

O f

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7-24-84 Question 2 Application ot IEEE Standard 485 to Quad Cities batteries is not appropriate since the batteries were never designed in accor-dance with IEEE Standard 485(batteries were designed and delivered about 10 years prior to tirst issuance ot IEEE Standard 485)..

. hoWeVer, in reghrds to temperature Correction tactor, Compensation ror age and cesign. margin the following comments are applicable:

a.

Temperature correction tactor is not requireo since the battery rooms are provided with heating and ventilation to maintain the temperature to the original design basis, b.

The battery capacity test acceptance criteria requires that the battery rueet the manuf acturer's rating.

Therefore, the aging tactor to account for degregation of battery

spacity is not requirea since the batteries are tested O. a routine basis in accordance with manutacturer and Oechnical specifications, c.

The application of design margin in this analysis is not appropriate since the attempt is to show that the battery has sufficient capacity for its application.

The Attachment B and associated cell sizing calculation worksheet shows the loads within the first minute of battery operation.

These loads are within the cattery capability.

(

7-24-84 Qusstion 3 The Attachments C, D and associated cell sizing calculation worksheet show the load cycles and battery endurance calculations for the following scenarios:

Attachment C:

A LOOP concurrent with a LOCA on Unit 1 and sate shutdown of Unit 2 with turbine building 125Vdc main bus 2A fault.

All operating loads to be fed trom Unit 1 battery and charger.

Attachment D:

Sate shutdown of both units with a LOOP and Unit 2 turbine building 125Vdc main bus 2A fault.

All operating loads to be red f rom Unit 1 battery and charger.

The battery endurance calculation shows the battery will last tor about 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months in both scenarios.

0 4

A t

7-24-84 Question 4 This: scenario is in violation of. Quad Cities. technical specifica-tion 1and station practice.

The-battery maintenance and surveillance on any unit battery is performed during two unit outage; however, the Attachment E and its associated cell sizing calculation worksheet "shows1the battery on Unit 1 (worst case) is capable of supplying the required load for sate shutdown ot the operating unit.

In this scenarlo, with availability ot charger, the battery lasts for about 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months .

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. QUESTION 5 L

The original Gould 100 ampere battery chargers had an

~=

automatic load limiting feature which limited the output current to

'120% of rated Eload by reducing the output voltage until the output current is reduced to the setpoint.

Excess current is then supplied

- by the battery,~ avoiding a charger trip.

-The Number 2 125 Volt battery charger tripping on May 10,

' 1984 has-been attributed to a faulty current limit card.

Load was transferred to the Number 2A charger which had been earlier replaced with a qualified. Class lE charger with a rated output of 200 amperes.

Subsequently, the remaining three (3) 125 Volt battery chargers have.been replaced with 200 ampere, qualified Class lE battery. chargers.

These chargers also have current limiting circuitry to prevent tripping under normal operations with any of the postulated load scenarios above.

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Attachment A Sh. 1 Quad Cities 125V DC Load Profile 7-24-84 h

1 2h 1 min.

hr.

next next next next 0-1 2-9 10-11 12-58 59-60 14 15-h 1h Trbulation of Loading:

sec.

min.

hr.

E: cape Lighting 100 100 100 100 100 100 100 100 100 Annunciator Relay Cabinet 15 15 15 15 15 15 15 15 15

& Visual Annunciator indicating Lamps:&

42 42 42 42 42 42 42 42 42 Auxiliary Relays RICI Controls 5

5 5

5 Plant Sirens 15 15 15 15 15 Electromatic Relie f Valves 32 4

4 Trip OCBS (Sw. Yd.)

108 Trip Field ACB 10 Trip ACES 198 Trip Turb. Mts.

10 20 100 Close ACBS Standby Diesel

. Field Flashing 140 3

11PCl Turbine Controls 5

5 5

Tip System Shear Valves 50 HPCI Turbine ' Drain Valves 5

5 5

T.:tal Discharge Currents:

498 327' 207 287 269 191 171 167 167 Q-1, Part 2 - Unit 1 (worst case) with no manual load shedding.

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A i I A.<= n mva r A s o. 2. :

-CELL SIZING WORKSHEET l-M -8d 3

(For-Ref. See ESC-291)

' Project; Date:

Page:

. Lowest Expected

^ Minimum Electrolyte Temp: *F -

Cell Voltage:

Cell Mfg:

Cell Type:

Sized By:

_ (II (2)

(3)

(4)

(5)

(6)

(7)

Required Section Size Capacity at (3) 4 (6A) = Positive Plates T Min Rate or Change in Duration Time to End (fiA) Amps /Pos (Rr) (3)= (68)= Rated Amp Hrs Load Load of Period of Section or Period (amperes)

(amperes)

(minutes)

(GB) K Factor (Kr)

Pos Values Neg Values Section 1 -First Period Only - If A2 is greater than Al. go to Section 2.

I Ai= #76 l Ai-o=41Slui- /

lT=Mi= /

l

// 7

3 i

+**

See i Total

,</,3 Section 2 First Two Periods Only - If A3 is greater than A2. go to Section 3.

1 A l = '[88 A l-0= #8 MI=

1 T= M I + M2= 15 60 67-2 A2= /d/

A 2-A l = 307 M2= 14 T= M2= 14-5::

9-7

~~

See Sub Tot ro. z.

3. 7 2

Total 2,5 Section 3 First Three Periods Only -If A4 is greater than A3. go to Section 4.

I A l e #'7 8 A l -0 ="178 M1=

1 T= M l + M 2 + M3 = u' d G c' S. 3 2

A2= ///

A2-Al=~ 07 M2=

i4-T= M2 + M3 =., '

c- "

's - /

3 A3= /7/

A3-A2=-2c M3= i5 T= M3=

tL

^'

=3 See Sub Tot B. r:.

JJ.=?

3 Total

2. ')

Section 4 First Four Periods Only if A5 is greater than A4, go to Section 5.

I A l = f78

'Al-0= N8 Ml=-

1 T= M 1 +. M4 = /E4 28

/ 7* O 2

A2= N/

A 2-A l =~jo/ M2= '+

T= M 2 + M 3 + M 4 =//7 m -

//. O 3

A3= /Vi A 3-A 2 = -Zo M3= 15 T= M 3 + M 4 = /C 8

Al=/e7 A 4 -A 3 = M = 1" T=M4=

9e t

See Sub Tot r /. is

//.**

4-Total g:;, g 3 Section 5 - First Five Periods Only if AG is greater Ihan AS. go to Section 6.

I Al=

A l M l =-

T=M l +. M 5 =

2 A2=

A2-AI=

M2=

T =M2+

M5=-

~~

~ ~ - - '

3 A3 A 3-A 2-

,y M. p:t T *.I't**11+ fit

g'.

/

Attachment B Quad Cities 12SV DC Load Profile 7-24-84 h

h 1

2h 1 min.

hr.

next next next next 0-1

2-9:

10-11 12-58 59-60 14 15 h

ih

-Tabulation of Loading:

sec.

min.

hr.

Escape - Ligt. ting 100 100 J100 100 100 100 100 100 100

- Annunciator Relay Cabinet 15 15 15 15 15 15 15 15 15

& Visual Annunciator R

Indicating Lamps &

42 42 42 42 42 42 42 42 42~

Auxiliary Relays

.RICI Controls 5

5 5

5 E

' Plant Sirens-15 15 15 15 15 TElectromatic ' Relie f Valves 32 4

4 Trip OCBS (Sw. Yd.)

'108

{,

_ Trip-Field ACB 10 Trip ACBS 198

-Trip Turb. Mts.-

10 Close ACBS 20 100 Standby Diesel 140

~-

Field Flashing HPC1 Turbine Controls 5

5 5

Llip System Shear Valves 50

- HPCI-Turbine Drain Valves 5

5 5

Total Discharge Currenta:

498

'327 207 287 269 191 171 167 167

~

Q Unit 1 (worst case) first minute load profile.

4 Attachment C Sh. 1 Quad Cities 125V DC Load Profile 7-24-84 h

1 2

1 min.

hr.

next next next next 0-1 2-9 10-11 12-58 59-60 14 15 h

1 l

.Tebulation of Loading:

sec.

min.

hr.

j Escape Lighting 100 100 1,00 100 100 100 100 100~

100

' Annunciator Relay Cabinet 15 15 15 15 15 15 15 15 15

& Visual Annunciator Indjcating Lamps &

42 42 42 42 42 42 42 42 42 Auxiliary - Relays

'RICl-Controls 10 10 10 10 10 10 Plant Sirens-15 15 15 15 15 Electroma tic. Relie f. Valves 64 8

8 Trip OCBSl(Sw. Yd.)

108

[

Trip. Field.ACB' 20

-Trip ACBS 204 4

Trip.Turb. Mts.

20 -

Close ACES 20 170

' Standby Diesel 140

/ Field Flashing kHPCI Turbine Controls 10 J10=

10 10 10 10

.10 10 10 l

(Tipj System Shear Valves 50 HPCI Turbine Drain Valyes 10

.10 10 10 10c

~10

-10 10 10-T j.

I' eTotal'. Discharge Currents:

539 342-222 372-

316 210 185 177' 177

! Bnttery Charger' Energized '

252:

196

~50

'65 57 57

~

lQ-3,cPartl1~~LA LOOP concurrent with LOCA in-Unit 1 and safe shutdown of Unit 2.with turbine-

-building 125Vde' main bus 2A fault.

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-CELL SIZING WORKSHEET CFor. Ref See ' ESC-291)

Project:

Date:

Page:

Lowest Expected Minimum Electrolyte Temp: *F Cell Voltage:

Cell Mfg:

Cell Type:

Sized By:

(I)

(2)

-(3)

(4)

(5)

(6)

. (7)

Required Section Site Capacity at (3) 4 (6A) = Pcsitive Plates T Min Rate or Change in -

Duration Time to End (6A) Amps /Pos (R )

Load Load of Period of Section or

'7 (3)s (6Bl= Rated Amp Hrs Period (amperes)

(amperes )

(minutes).

(minutes)

(GB) K Factor (K )

Pos Values Neg Values 7

Section 1 -First Period Only - If A2 is greater than Al. go to Section 2.

i I Ai= cas I Al-0=539lMl= /

lT=M1=

/

l 11 7

f. 6 Sec I Total 1, to Section 2 First Two Periods Only If A3 is greater than' A2. go to Section 3.

~

l A l =.53 9 '

A l-0=639 MI= 1 T= M l + M2= IC D

0 ~7 2

A2=

'/ r A2-Alive M2= I4 T= M2=

l'r

-a.

5 See Sub Tot

<p. 7 L,

2 Total j,7 Section 3 First Three Periods Only If A4 is greater than A3. go to Section 4.

I Ale SD9

' A l -0 = 6#.'l Ml=

1 T= MI'+ M2 +M3=30 6F

'.'. O 2

A2=

'/

A 2 -A l s'/'t y M2= l1 T= M 2 + M 3 = - ::/</

9

.G 3

A3='

O f7 A 3 - A 2 =-/ ' M 3 = '

T= M3=

/C

-~

7. 'e.

See Sub Tot

'.o 3

Total g,,4 Section 4 First Four Periods Only If AS is greater than A4, go to Section E T= M 1 +.. M i =7 Y *

il 4'//. W -

I Al= S39 A l-0 =S W Ml= 1 t

2 A2=

'/"

A 2-A i ="rd'; M2= t'l T= M 2 + M 3 + M 4 5 7b N/t 8f

-/o. M 3

A3=

r f:

A 3-A 2 = -

M3= i; T= M3 +M4 = 7'4 HE 7

.J

-l A l=

SV A 4 -A 3 = - -

M 4 = 7,it T=M4=

7hg i7 7

7"r<c yst.r)* 4 /s/ //004$ A t

Section 5 First Five Periods Only 'If A6 is greater than AS. go to Section 6.

i 1

Al=

A l- 0=

Ml=

T= M 1 +..M 5 =

_2 A2=

A2-Al=

M2=

T= M 2 + M5=

3

a.. t A 'l-A 2 M:t i M t i ? t i + f t r.

.1 1

r-

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Quad Cities 125V DC Load Profile Attachment D Sh. 1 7-24-84 1

2h 1 min.

hr.

l

~

next next next next 0-1 2-9 10-11 12-58 59-60 14 15 h

Ib l

' Tabulation of' Loading:

sec.

min.

hr..

hr.

}

I Escape Lighting 100 100 100 100 100 100 100 100 100 l Annunciator Relay Cabinet 15 15 15 15 15 15 15 15 15

_ &_ Visual Annunciator Indicating' Lamps &

42 42 42 42 42 42 42 42 42 Auxiliary. Relays

~RICI Controls 10 10 10 10 10 10 iPlant Sirens 15 15 15 15 15

~

04 8

8

'Electromatic Relief Valves LTrip OCBS (Sw.LYd.)

108

? Trip Field ACB 20

-Trip ACBS 204

, Trip _Turb. Mts.

20 l-20 170

~-

Close ACBS j

~l

Standby Diesel 140

. Field Flashing

~

HPCI rurbine Controls 10 10

~10

.10 10 10

.10 101 10.

' Tip System Shear Valves i

.j HPCl Turbine Drain d'alves' 10 10' 10-10 10

-10 10 10 10 L otal Discharge currents:

53'9 342-222 372' 266 210

'165' 177:

177-T I

.52 L146 90 65 57.

- 57 '

~

?Bsttery(Charger: Energi.ned

.j

?

Q-3, Part 2' ' Safe: shutdown of both units'with a LOOP and, Unit 2 turbine building.

~

. 125Vdc main-busLfault.

A J

s t;

~

pgaaRY: 4Fp,.sp, 2

{

CELL SIZING WORKSHEET

-(For Ref+.See ESC-2911 Project:

Date:

Page:

Lowest Expected Minimum l

Electrolyte Temp; *F Cell Voltage:

Cell Mfg:

Cell Type:

Sized By:

(1)

(2)

(3)

- (4 )

(5)

(6)

(7)

?

Required Section Site Capacity at (3) 4 (6A) = Positive Plates T Min Rate or Change in Duration Time to End (6A) Amps /Pos (R7) (3)w (68)= Rated Amp Hrs Load Load

'of Period of Section or i

Period (amperes)

(amperes)

(minutes)

- (mintetes)

(GB) K Factor (Kri Pos Values Neg Values Section 1 -First Period Only - If A2 is greater than AI. go to Section 2.

f l A n - 539 l Ai-o=539lMi- /

lT=Mi-

/

l 11 7

-;f. 6 I

i

=*

Sec I Total g, fo Section 2 First Two Periods Only If A3 is greater than A2. go to Section 3.

I A l =.539 Al-0=539 M=

1 T= M i + M 2= /6 So d7 2

A2=

90 A 2-A I Qf) M2= 14 T= M2=

J +1

.g z Ji. S.

l See Sub Tot 4,. -1 S.S 2

Total j,7 Section 3 First Three Periods Only If A4 is greater than A3. go to Section 4.

l I

A l e 539 A l -0 =b39 Ml= I T= M1

M2+M3=M 40

9. O I

2 A2=

'/ O A2-AliOY M 2 = A4 T-M2+M3=

29 GO-

~

~7 5 3

A3=

65 A 3 - A 2 =-25 M3=16 T= M3=

/6 M.O 3

'i li See __ Sub Tot

'). c,

~/. 1:2 3

Total

}g j

Section 4 First Four Periods Only If A5 is greater than, A4. go to Section i I

I A l = 639 Al-0=539 MI=

1 T= M I +.. M 1 =7 /'2M II r/7. O

)

2 A2= 9d A 2-A I J'#f'/ M2= 14 T= M 2 + M 3 + M -I v 7W mL II

-/Og' l

3 A3=

4S A 3-A 2 = PS M3= 16 T= M3 +M4 = 7% He

1

p. o j

i A l=

S7 A -I-A 3 = -M M l = 7//it T=M4=

7 /ig 12.

7 puh Tot 4'/, O D.S Yss, ?; ssL P.* is/ //04/A $ _

. ec 4-rotal g,g Sectie.n 5 First Five Periods Only if A6 is greater than AS. go to Section 6.

I Ala A l-0 =

Ml=

T=Ml+ M5=

2 A2=

A2-Al*

M2-T-M 2 +

M5' t

t 't s't-

[f t I tt;3 - - 'i

^ *

'..e I

Quad Cities 125V DC Load Profile Attachment E Sh. 1 7-24-84 k

h 1

2h 1 min.

hr.

next next next next 0-1 2-9 10-11 12-58 59-60 14 15 h

Ih

)

abulation of Landing:

sec.

sec, sec.

sec.

min.

hr.

i t

- Escape Lighting 162 162 162 162 162 162 162 162 162 l

)

1 Annunciator Relay Cabinet 30 30 30 30 30 30 30 30 30

& Visual Annunciator Indicating Lamps &

84 84 84 84 84 84 84 84 84 Auxiliary Relays t

RICI 5

5 5

5 30 30 30 30 30 Plant Sirens 32 4

4 Electromatic Reliet Valves

Trip OCBS_(Sw. Yd.)

108 f

i 4

1, Trip Field ACB -

10 1

Trip ACBS' 288 l

Trip Turb. hts.

10

~

[

30

'140 Close ABS i

Standby Diesel ^

LField Flashing-210

/

I RPC11 Turbine Controls-5 5

5 5-5 5

5-5 5-j.

1 Tip System' Shear Valves t

HPCI Turbine Drain Valves -

5 5

5

,_e,

=

u

Tctal Discharge Currents:

-707 327 207 287 219 191 161

,157 157 l i

Buttery-Charger Energiz2d 167 99 71 41 37 37 t

t Q LOOP, Unit 2 shutdown with maintenance and surveillance on its.125Vdc system,

, safe. shutdown'of operating Unit 1.

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~ CELL SIZING WORKSHEET m

-(For Ref. See ESC-291)

Froject:

Date:

Page:

Lowest Expected Minimum Electrolyte Temp: "F Cell Voltage:

Cell Mfg:

Cell Type:

Sized By:

lit (2)

(3)

(4)

(5)

(6)

(7)

Required Section Size Capacity at (3) + (6A) = Positive Plates T Min Rate or Change in Duration Time to End (fiA) Amps /Pos (R ) (3)w (68)= Rated Amp Hrs 7

Load Load of Period

- of Section or Period (amperes) lamperes)

(minutes)

(GB) K Factor IKr)

Pos Values Neg Values Section 1 -First Period Only - If A2 is greater than Al, go to Section 2.

1 lAl-767 l Al-0=707 lMl = 1 lT= M l = 1 l

I I '/

6-O-See i Tot al.

/,. O Section 2 First Two Periods Only if A3 is greater than A2, go to Section 3.

I A 1 = 74 7 Al-0=107 Ml=

1 T= M i + M 2=

1C 80

/S O

_2 A2=

7/

A 2-A I it.% M2= n 'i-T= M.!=

lei.

S 7.

7. i-5 Sec Sub Tot A. r<

..n

~~

2 Total j,0 Section 3 First Three Periods Only - If A4 is greater than A3. go to Section 4.

I A1, 707 A l -0 = 74 7 Ml= 1 T= Ml +M2 +M3=? c Go

//. 6 2

A 2=

-//

A2-AIGR M2= l '+

T=M2+M3=

ref r-o

,.".<A 3

A3= 4/

A3-A 2=-3 0 M3= IG T= M3=

IG He

. q.

Sec Sub Tot N. 8

//. o 3

Total o, p3 Section 4 First Four Periods Only II A5 is greater than A4. go to Section 5.

I A l= 7 /> 7 Al-0=7ITI Mi=

1 T= Ml + M4 -/8 b VE 6

//7 6 2

A2=

'l /

A 2-A 1 @N M2=

I4 T= M 2 + M 3 + M 4 218% a rt.

r-

//ec>

3 A3=

~/

A 3-A 2 = -f n M3=

19 T = M 3 + M 4 = /6/4. wt 6

0 4

At=

c/

A 4 -A 3 = -4 M4= i *;- ni.

T= M4 =

/B /et' u

7

~D M G vLu s su peu/g, J See St.6 Tot

//'l.h

///. 7 4-Total

g., /

Section 5 First Five Periods Only if A6 is greater than AS. go to Section 6.

1 Al=

Al-0=

Ml=

T=Ml+ M5=

2 A2-A2-Al=

M2=

T = M 2+

M5=

t 3 '?

A :t

-\\ :'

Mt

'I Pil u i r1r

ML20094J432

Contents

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Dear Mr. Denton:

Reference:

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ML20094J432

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Dear Mr. Denton:

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