ML20101J753

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Derate Circuits DGE4A,DGE14A,DGE32A & MCE4A for TSI Fire Barrier
ML20101J753
Person / Time
Site: Summer 
Issue date: 12/02/1992
From: Lynn M
SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML20101J726 List:
References
DC08490-008, DC08490-008-R03, DC8490-8, DC8490-8-R3, NUDOCS 9604020130
Download: ML20101J753 (6)
v • d • e


Text

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ES-412 ATTACHMENT I PAGE1OF2 REVISION 1 coq gowoi8 %V SUBJECT CODE SOUTH CAROLINA & ELECTRIC AND GAS COMPANY PAGE CALCULATION RECORD 1

OF 4 CALCTITLE Deree Ckts DC759 A,CC79% CALC NO.

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A PARENT DOCUMENT SYSTEM SAFETY CLASS CAL CLASS 2

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i ORIGINATOR DISC ORGANIZATION DATE MC. Lpd EE

scarc, n/20/92 Dc-e49 -cc8 k#

XREF NO.

s A. CALCULATION INFORM ATION CONTENT DESCRIPTION:

C SEE REVISION Urmik(PR ACFFDhhN(hl O[rCU[iq (frrtPr (TSIYotL codduit h 2r $c W m enf Ch ?) { h( St P

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AFFECTED COMPONENTS / ANALYSIS:

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CONTAINS PRELIMINARY DATA / ASSUMPTIONS NO f /YES, PAGES D

COMPUTER PROGRAM USED:

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YES, VALIDATION NOT REQ'D (REF. 3.5}

YES, VAllDATED (OTH ER5]

YES, VAllDATED [ES-4121 PROGRAM VALIDATION CALCU LATION B. VERIFICATION O CONTINUED, ATTACHMENT VERIFICATION SCOPE:

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VERIFIER:

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ASSIGN BY:

SGCM i

v -N.EAD ENGINEER (GESIGNEE)/DATE APPROVA DATE VERIFIER /DATE w 0 25M

//f 3nl1 V C. RECORDS REEL FRAME TO PR'i k

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\\ INIT/D'ATg ORIGINAL MAINTAINED BY:

Y SCE&G DE VENDOR 9604020130 960329

'.> D R ADOCK 05000395 SCE&G P

PDR DISTRIBUTION:

CALC FILE [ORIGINAll DSE SGC- / SYSTEM ENG\\0 AuTbE FILE 20.6602 [ ATTACH. I ONLY, COPY)

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ES 412 ATTACHMENT I PAGE2OF2 REVISION O SOUTH CAROLINA ELECTRIC & GAS COMPANY PAGE REVISION

SUMMARY

2 OF i CALCULATION NO.

SUMM ARY DESCRIPTION i

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POWER AND INDUSTRIAL SYSTEMS DIVISION - READING PAGE [

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CALCULATION P ROJ E CT :

IDENTIFIER V.

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Summer Nuclear Station DC-849-00R ggggg A SU BJ E CT:

.I4E4 A,D6E/4A Ap 3(:qES2A C L ASSI FIC ATION I

Compones

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Derate Ckts.MCE4A,for TSI Fire Barrier NSR

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bECTION N AME AND NUMBE R" MKF'-2/ 572

  • 0 go 422.

l Flectrical Ennineerinc / 0421 MRF-21 %9 50-41R REVISION O

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DATE Of-gf,-86 o 2 - lo)-6 8 6&L6-88 REVIEWER / VERIFIER gg,%

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DATE l-2.B-86 l'-7,3-88 4-2.S -M ASSUMPTIONS / PRELIMINARY DATA

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PAGES REFERENCE g

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THIS CALCULATION REQUIRES O REVIEW PER E-1 NO. 9

@ VERIFICATION PER DCP 2.05 RESULTS ARE NOTED BELOW.

REMARKS REMARKS REMARKS REMARK 5 THE REVIEW OF THE CALCUL ATION INCLUDED EVALUATION AGAINST THE FOLLOWING QUESTIONS:

WERE INPUT 5, INCLUDING CODES, STANDARDS, AND REGUL ATORY REQUIREMENTS, CORRECTLY Y6'$

SELECT 2D AND APPLIED?

ARE ASSUMPTIONS REASONABLE AND ADEQU ATELY IDENTIFIED?

HAVE APPLICABLE CONSTRUCTION AND OPERATING EXPERIENCES g

BEEN CONSIDERED?

l l

WAS AN APPROPRI ATE CALCULATION METHOD USED?

l 15 THE OUTPUT RE ASONABLE COMPARED TO INPUT 5?

Gilbert / Commonwealth THIS IS A PERMANENT DESIGN RECORD DO NOT DESTROY

d SUBJECT Derste Circuits MCEAA.DGE4A. DGE14A.

) Gilbert Associates,inc.

and DGE32A for Tst Fire Barrier Reading. Pennsylvania 4

' 't MICROFILMED paws CALCULATION g,,g,,,,gg c H,,,,

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,y j DATE 01 76-88 c2-f9-88 2

  • ZW W $

1 PURPOSE To determine the new ampacity for the 125Vdc 'A' train power circuits MCE4A, DGE4A, DGE14A, and DGE32A because a section of conduit, through which the circuits are routed, was wrapped with TSI fire barrier material in fire zone CB-2 room 12-04.

2.

DESIGN INPUTS I

DI-832-011 and DI-832-012 3.

COMPUTER PROGRAM USED None 4.

ASSUMPTIONS 6.8 percent ampacity derating for cables in conduit with a 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> wrap is as shown in TSI catalog, dated October 1982. Since the derating factor for TSI wrapped raceway is questionable, this calculation will conservatively assume a 28 percent ampacity derating as indicated by test results for cable in trag as I

telecopied by T5t. (Refer to G/C DlR No. DI-832-011, Attachment 5). *e cr+metic-cW ed : 2 ::n,0 -

2 cc~e~::t b cep::,,_._,, y 5.

CALCU LATION The following identifies circuits and respective circuit parameters for 'A' tram circuits routed through e

XX-7177A - 3.0" G.

Circuit No.

Conduit No & Size B/M No.

OD MCE4A 1-2-1/0 AWG A25 1.22" 32B DGE4A 1-2-6 AWG

  • iHP

.0.82" O.8 7 Q

DGE14A 1-2-2 AWG A3A 1.09" DGE32A 1-2-10 AWG A3D 0.61" Circuit parameters are as provided by G/C drawing No. 5-200-912, Table 1.

The following conductor sizes and ampacities are applicable to aforementioned circuits, and are as e

provided by V. C. Summer Project Design Criteria Section 4.10, for 600 Volt rated cable in single lay power (SLP) tray in 40*C ambient air (cable in conduit is conservatively assumed to be the same as cable PfY-in SLP tray).

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Cc.Lt Size Ampacity

  1. 1/0 AWG 130 amps
  1. 2 AWG 96 amps
  1. 6 AWG 55 amps
  1. 10 AWG 28 amps The following are maximum short term full load amps for 'A' train feeder cable, per G/C Calculation No.

e DC-832-010, Table 3A-1:

Circuit Number.

Time Followino LOOP Maximum Current DGE4A (was DGE1 A)

Oto 2.25 seconds 3.877 amps DGE14A (was DGE11 A) 6 to 10.25 seconds 10.554 amps DGE32A (was DGE25A) 6 to 10.25 seconds 2.69 amps PROPRIETARYINFORMATION OF GILBERT ASSOCIATES INC FOR INrERNAL UsE ONLY yllS ISMM_ANENT RECOR_D DO NOT DESTROY

l

  1. 6 SUBJECT Derate Circuits MCE4A, DGE4A. DGE14A, C-849-008 3

') Gilbert Associates,Inc.

and DGE32 A for Tsl Fare Barrier l

l Reading, Pennsylvania REVl d

j

[

4 2

"U

'#GES CALCULATION ORIGINATOR c u,ww c*A44(

g DATE 01-26-88 07 - (*) - 8 8 M2.8 -$ $

5.

CALCULATION (continued):

ll 3" O conduit I.D. is approximately 3.068" l

l Maximum short term (0 to 2.25 seconds following LOOP) full load amps for the 'A' train main control l

board feeder cable MCE4A is 42.375 amps, per G/C calculation No. DC-832-010, Table 1 A, Circuit 8A.

Derating factor for cable in conduit with 40% conduit fill for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> barrier is 28% (refer to assumption).

Reauired Circuit Ampacity e Required Ampacity for MCE4A = (42.375 amps)(1.10 load uncertainty)(1.05 future load growth) l

= 48.943 amps or 49 amps e Required Ampacity for DGE4A = (3.877 amps)(1.10 load uncertainty) l

= 4.7647 amps or 4.3 amps Required Ampacity for DGE14A = (10.554 amps)(1.10 load uncertainty) e l

= 11.6094 amps or 11.6 amps Required Ampacity for DGE32A = (2.69 amps)(1.10 load uncertainty) e 2.959 amps or 3 amps

=

I g

Conduit Fill q

Conduit Fill

= 3.1417 [(1.22/2)2 + (MI/2) 2 + (1.09/2)2 + (0.61/2)2]+ 3.1417 (3.068/2)2

= 3.1417 [0.3721 +.&468T + 0.2970 + 0.0930] + 7.3927 b

o. e2,

= gor 40%

Percent fill is equal to or less than 40%; therefore, the conduit fill is in accordance with the T5I catalog data.

Derated Circuit Ampacity e Derated Circuit Ampacity for MCE4A

= (130 amps)(1 - 0.28 derate per TSI) + 1.10 safety margin

= (130 amps)( 0.72) + 1.10 i

= 85.090909 amps or 85 amps l

l e Derated Circuit Ampacity for DGE4A

= (55 amps)(1 - 0.28 derate per TSI) + 1.10 safety margin

= (55 amps)( 0.72) + 1.10

= 36 amps e Derated Circuit Ampacity for DGE14A

= (96 amps)(1 - 0.28 derate per TSI) + 1.10 safety margin

= (96 amps)( 0.72) + 1.10 j

= 62.836364 amps or 63 amps s Derated Circuit Ampacity for DGE32A

= (28 amps)(1 -0.28 derate per TSI) + 1.10 safety margin

= (28 amps)( 0.72) + 1.10

= 18.327273 amps or 18 amps PROPRIETARYINFORMATION OF GILBERT ASSOCIATE 5 Nc " 4 tNTERNAL UsE ONLY DO NOT_ DESTROY TMIS A. PERMANENT REM S

O

^

SUBJECT Derate Circurts MCE4A.DGE4A. DGE14A,

) Gilbert Associates,Inc.

and DGE32A for TSI Fire Q DC-849-008 4

Reading, Pennsylvania REV.l

[

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'^" 5 CALCULATION ORIGINATOR e w...wd,,0.,

CM DATE 01-26-88 o 2 -(S -F2 Conclusion Although the derating factor provided by T5I may not be exact; the 85 amps calculated ampacity of the

  1. 1/0 AWG cable exceeds the required 49 amps ampacity by a margin of 73% (i.e.,85 - 49 + 49), the 36 amps calculated ampacity of the #6 AWG cable exceeds the required 4.3 amos ampacity by a margin of 737% (i.e.,36 - 4.3 + 4.3), the 63 amps calculated ampacity of the #2 AWG cable exceeds the required 11.6 amps ampacity by a margin of 443% (i.e.,63 - 11.6 + 11.6), the 18 amps calculated ampacity of the I
  1. 10 AWG cable exceeds the required 3 amps ampacity by a margin of 500% 0 e,18 - 3 + 3). These margins are in addition to the 10% safety margin and extremely conservative devating factor included in the calculation. Therefore, the circuit ampacity is acceptable after placement of a one hour T51 fire barrier on the conduit.

i

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PROPRIETARY INFORMATION OF GILBERT ASSOCIATES INC.- FOR INTERN AL USE ONLY THISIS A PERMANENTRECORD DO NOT DESTROY

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