Text

Rev 0 to Minimizing Separation Requirements for Cables
	ML20137M287
Person / Time
Site:	Clinton
Issue date:	05/17/1985
From:	; SARGENT & LUNDY, INC.
To:	;
Shared Package
ML20137M160	List: ML20137M163; ML20137M167; ML20137M175; ML20137M185; ML20137M193; ML20137M197; ML20137M206; ML20137M215; ML20137M239; ML20137M267; ML20137M281; ML20137M287; ML20137M300; U-600412, Forwards Calculations Providing Design Basis for FSAR Discussion on Electrical Separation,Including Rev 0 to 19BD-2,19BD-8,19BD-11,19BD-12,19BD-13,19BD-15,19BD-16 & 19BD-17 & Rev 1 to 19BD-5,19BD-7 & 19BD-10;
References
	19-BD-16, 19-BD-16-R, 19-BD-16-R00, NUDOCS 8601280232
	Download: ML20137M287 (2)
	v • d • e

Cales Fe, Minimizing StpCration Calc. No. 19-80-16 SMGE?iT kLUT10Y

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necuirementa for Cablea R e,. 0 0. 5// 7 Ar C '**C ^ "

X Lfety-Related Non-Lfety-Refsted Page 1 of 22 Prewed by I 2 h2M C'.ent Illinois Power Ccmpany CataS-/d-56 Protect Clinton Power Station - Unit 1 Reviewed hv/g _ Dets f./A f r Prei. No. 4536-35 Epo No. Approved by ht4 V. hr Date f-/ 7-S

/ s REVISION STATUS: @ . y i V, ' E ~Y' 6. .'.'. -

%i& MS ; I9O Revision 0 - First issue of all pages PURPOSE:

The purpose of this calculation is to determine whether a faulted

!19/22, #19/25, 116 or # 20 AWG cable (s) in a conduit, pull box, or junction box which is less than 1 inch away from another cable will have an adverse af fect on the other cable. .

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Calcz For Minimi2Ing SCparation Caic. No.19 -BD-16 SMiGENT k LUNDY acquirements for Cables n o. o ost.

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c"c^oo Xl he,,y_neisted Non-hf ety-R eisted - Age 2 of 22 c: rt Illineis Pcwer Company Precered by cet, hotect Clinton Power Station - Unit 1 Revweed by Date ho, No. 4536-35 Econ No. Acoroved by Date QA CALCULATION' REVIEW CHECKLIST

-TYPE JF CALCULATION

@ Hand-PreparedDesignCalculationOnly Cc=puter-Aided Design Calculation Only Both Hand-Prepared and Computer-Aided Design Calculation

, FOR' HAND-PREPARED DESIGN CALC FOR CCMPUTER-AIDED DESIGN CALC (check the appropriate ite=s) (check the appropriate items)

Detailed review of the original A review to determine if the engineerin;

, calculation. design and analysis computer program (s) used have been validated and docu=ented Review by an alternate, simplified and that the calculation, regardless of or approx 1= ate method of calcula- the program used, contains all the tion. necessary documentation for recon-struction at a later date. (MUST BE 1 Review of a representative sample PERFORMED) l .of repetitive calculations.

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O Revi'" of the calculation 8E8108C O ^Pr'o' gram"is suitable to the problem bein; a si=ilar calculation previously analyzed.(MUST BE PERFORMED) perfor=ed.

A review to determine if the input data

- as specified for program execution is

consistent with the design input, correctly defines the problem for the com'puter program algorithm and is sufficiently accurate to produce results within any numerical limitation of the a program.'(MUST BE PERFORMED) .

a!

, . A review to verify that the results 8 obtained from the program are correct

and within stated assumptions and

limitations of the program and are l -

consistent with the input. (MUST BE

. PERFORMED) a

] Validation documentation for temporary changes to listed programs or develop-mental programs or unique single appli-cation programs shall be reviewed to

., assure that methods used adequately validate the program for the intended j application. (WRERE APPLICABLE)

REVIEWER: M. -; DATE: S"-/ 7, 8 S"

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. . C8cs For Minimizing Separction cue. co. 19-BD-16 SMCE'fT h LU'lDY aequirements for cables Re.. o D.,

ansween c -"C ^

X l Lferv Rosad l N on-hf ety-R ested N;, 4 of 22 c*t Illinois Power Cercanv P tored bv Den Promet cliy, ten power Station - Unit 1 Rev.ewed by '0:n Frei No. 4536-35 Esmo No. Aporeved hv ! 0ets ME"'HCDOI CGY :

Since current interrupting devices will clear a f ault involving high

=agnitudes of current very quickly, the wires involved will generate negligible beat. The worst case failure of wires for which the sepa, ration criteria cust protect adjacent wiring (i.e, one inch separationl is a sustained overcurrent condition where the magnitude of the current is just below that which will cause the protective device to operate. This condition generates the greatest amount of hest over a period of time and has the greatest potential for causing da= age to nearby circuits.

For . circuits which are fused, fuse f ailure is not considered since the only recognized node of failure for a fuse is to open a circuit.

i If this type of failure occurs, no problem will exist since the

, current will be interrupted. ,

. By varying the distance a id number of conductors, the calculation .

p determines the maxit::um continuous . current which may ficw in each

[ conductor of a cable sinultaneously.while the cable is,in an enclosed ,

raceway without.the outside . cable._ jacket temperature of the other

,.._ cable also in an enclosed raceway exceeding 130 C which,is the overload _,

a rating of the cable insulation. ._- - . . . . . . .

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,_3y.taking protective device tolerance into account, the maximum current __

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C! eet Illinois Power Company Prepared by Date Pro ect Clinton Power Station - Unit 1 Rmewed by l Date Prei. Mo. 4536-35 Ecuro No. Acoroved by l Dees METHODOLOGY (Continued)

This approach is used for conduits which are touching and conduits which are separated by 1/8" or greater air gap.

For conduits which are touching S&L Standard ESA-105 is used assuming conservatively that there is a 10011 heat transfer from the f ailed conduit to the outer jacket of the other cable.

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. For conduits which are separated by 1/8" or greater air gap the , _

. data developed by MAD (DIT-CLI-MAD-0001-00 and 0002-00) provides j .the. W/FT needed to raise a receiving conduit containing .a cable

i. to 130 C. These values are provided for both a horizontal and a i vertical configuration of ' a f ailed cable in conduit. . Based on this

. value, the maximum current is calculated.

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, Finally, it is demonstrated' that the values for maximum current '

i developed for conduits can be applied conservatively. to failed i_. cables in pull boxes or junction boxes. _ , _ , , . , , _ , , _ _

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t j C-C^oc Safety-Reisted X i Non-Sof'fv-R'isted Psge 6 of 22 c:,ent Illinois Power Company Preo.ree b, lcese l f Proiect Clinton Power Station - Unit 1 Revisived hv l 0ste Prov. No. 4 $3 6-8.f. Eouio No. Aceroved by lDets

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l; METHODOI.OGY (Continued) i I

For this calculation, each type of .19/22, A p19/25, i16 and 420 AWG cable used on Clinton is looked at. The Cr-A and Cr-C thermocouple 4

I type dables are excluded,since when a thermocouple circuit is l

i short circuited, negligible current will flow.

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. AS ST.NPTIONS : ._

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It has been assumed that one cable is installed in a conduit for the 4

cable carrying a sustained overcurrent and that all, conductors for , _ .

, a cable are carrying a sustained overcurrent simultaneously. _This._ . _,

calculation is valid if more than one cable is in the conduit provided

.only one cable is carrying.a sustained overcurrent. These assumptions L Are . conservative since it is .)tighly unlikely that all conductors of a' , l

[ cable or other cables in a raceway associated with other, circuits l . will have the said f ailures at the..same time. ... .

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Recuirements for Cablan Date C '* 'C "C X Safety-Reisted Non-Saf ety-R ektW % 17 of 22 C:ent Illinois Power Comeany Prepared by Date P oieet Clinton Power Station - Unit 1 Reviewed hv ! Oate Proi. No. ~4536-35 Eauio. No. Approved by l Dete Crrr,r e m r .,, m t y p r e yA6vrs Orv en: pec Fan c o vos ir 7 Caucair . iv rro rperious o? PAL y.. Fan. &C$ D.C.. HCL $0X nub 3 cam

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c-c^oo x sterv-R amd Non-Lfety-Reuted P ,e 18 of 22 ciet Illinois Power Company preo. red ev om >

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X Safety-Reisted Non-Safety-Redeted Pnp 19 of 2 2 Cf.ent Illinois Power Co. meany Preoeredbv l 0ste Pro;ect Clinton Power Station - Unit 1 R eviW hy Oete Proi. No. 4536-35 Equio No. Aoproved tv Date

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. . Cdes For Minimizing Separation c,ie. me 19-BD-16 SARGENT t LUNDY Requirements for Cables R, O o ,,,

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C-C^ C X saf ety-p eisted l N o n-saf erv-R eis ted ?>g. 20 of 22 Cbent Illinois Power Company P toared bv Oste Pretect Clinton Power Station - Unit 1 Reseaed by l0ste Prei. No. 4536-35 Euro No. Aceroved by l Date ANALYSIS OF RESULT FOR PULL BOX Since the amount of heat needed to raise the pull box temperature to 130 C is significantly greater than that needed to raise the conduit to 130 C, using the value of fuse size developed for conduits in contact is conservative. Although this calculation was perforned for'a pull box positioned horizontally, the conclusion is valid regardless of the position. This is true because heat dissipated by radiation alone exceeds the amount for the conduit, and the radiation co=ponent is independent of position.

For cases where a failed cable is in a pull box near a conduit but not in contact (ninimum 1/8"] with the conduit it will be conservative

to use the ncminal current values for protective devices developed _

fc: vertical conduits with 1/8" spacing using the value of .the largest

conduit attached to the box. This is conservative because the h nominal current value used for the failed cable in the pull box was I

developed for a conduit which is smaller than the pull box. This is f substantiated with the data supplied by MAD (DIT-CLI-MAD-0001-00 and '

p 0002-001 which shows that as the size of the conduit containing the

.. . failed cable is increased, the amount of heat needed . to raise the . .

,. . temperature of the nearby conduit is greater. The. values for ,_ _ _

j L_.yertical condufts (tables 5, 6, 7, 81 shall be:used since pull boxes _,.

g ._ have large vertical surf aces regardless of the pos.ition. of the box. --- .

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h_ If a f ailed cab.le..is..in a._ conduit _near a pull box but not,in contact r' ...(minimum .1/ 8.".l. ,with the . pull box , it will be conservative to use the ,

[ ... fuse yalues..de'feloped for a. horizontal or vertical conduit depending I .

p. on the position of the conduit.

This is conservative because the L... worst . case f or a receiving . conduit.. in. MAD 's analysis. is the smallest t

s iz e ..(i.. e . 3/4" conduit] .and.all pull boxes will always .be larger than.a.3/4".. conduit size used in the calculation.'

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ua p., Minimizing Separation ge.u. 19-BD-16 SARGENT E LUNDY aequirements for Cables R ,v o e s ,,

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C~C^GC X Lf ety _ R eisted N on-Lf ety-R elated hce 21 of 22 CI,ent Illinois EO**er CCCpany Prewed by Cate haieet Clinton Power Station - Unit 1 Reviewed by Date Pro, No. 4 5 3 6-3 5 Ecuic No. Aporeved ev :

Oste For interactions between pull boxes whether in contact or not, use the values for conduits in contact. This will be conservative.

Using the values for conduits in contact eliminates ovaluating two large surfaces adjacent to each other.and is conservative.

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, N on-Saf ety-R elated he 22 of 22 C:et Illincris Power Company hecared t , 0.t.

homet Clinton Power Station - Unit 1 Rmewed by Date Proi No. 4536-35 Ecu'o No. Acoroved by l Cate CONCLUSION:

Separation of less than one inch of a faulted 119/22, 119/25, #16 and

20 AWG cable in a conduit, pull box, or junction box and any other circuit is acceptsble p cvided the faulted circuit is protected by a fuse or qualified breaker which is smaller than the maximum current with tolerance defined in the calculation for that particular separatier configuration.

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