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In Response to NRC 781208 Request for Addl Info on Electrical Penetrations,Forwards Info on HPCI Penetrations Which Are Identical to RPS Penetrations.Unit 2 Has No DC Power Penetrations
	ML17173A694
Person / Time
Site:	Dresden
Issue date:	03/14/1979
From:	Janecek R; COMMONWEALTH EDISON CO.
To:	Ziemann D; Office of Nuclear Reactor Regulation
References
	TASK-08-04, TASK-8-4, TASK-RR NUDOCS 7903210026
	Download: ML17173A694 (25)
	v • d • e

-

One First National Plaza, Chicago, Illinois

- .eB*'

. commonwealth Edison Address Reply to: Post Office Box 767 Chicago.. Illinois 60690 Mr. D. L. Ziemann, Chief Operating Reactors Branch 2

. March 14, 1979 Division of Operating Reacto-:s RFGLJi "TQRV u.s. Nuclear Regulatory Commission Ln H

Washington, D.C. *

20555 DOCl\\ET FILE COPY

Subject:

.Dresden Station Units 1 & 2 Systematic Evaluation Program Additional Information for Topic VIII-4 NRC Docket Nos. 50~10/237 Reference (a):

D. L. Ziemann letter to c. Reed dated December 8, 1978

Dear Mr. Ziemann:

In response to Reference (a) requesting additional information on the Dresden electrical penetration in connection with SEP Topic VIII-4 *"Electrical Penetration of Reactor

. Containments," we are submitting two attachments.

Attachment I answers the questions relative to Dresden Unit 1.

The HPCI and RPS penetrations are typical of each other~ therefore, we only provided information on the HPCI penetration.

For the original penetrations, we could not find any information

.relating*to rated short circuit overload currents or continuous current.

Attachment II addresses Dresden Unit 2 penetrations.

Note that we have no DC power penetrations.

Please address any questions you may have concerning this subject to this off ice.

7 9 0 3 2 1 0 0 ~-"'

attachments Very truly yours, Nuclear Boiling Licensing Administrator water Reactors

~{f

~~

'r~

. ATTACHMENT I 9 D_ocket No. 50-10.

.SEP In.formation:. Electrical Penetrations Dresden Unit 1 New Penetrations (HPCI System)

I~

Low Voltage (150-lOOOV ac)

A.

Circuit Information

l.

480V ac MCC ll5 (Compartment. F2) Feed to HPCI InJ ection Valve MJ-l-6104A

2.

Protection Devices

a. Pr:1mary:. lOOA frame )-pole, melded case air circuit breaker, thennal magnetic, 40A trip. Westinghouse type FB40 - see time/current curve SC-3509-77.

b. Secondary:. 600A frame, 3-pole, molded case air circuit breaker, long time.,. short time, 50QA current rating,

Westinghouse type SPCB-600. -**see time/current curve sc.;.J676-76.

J.

Maximum short circuit current available for this circuit is 2i52A (BUS symmetrical}.

4.

External conductor size: 3 conductor #61.JlG, B.

Electric Penetrat:ton In.formation

1.

Conax _modular'* nange-type bol t..on penetration tj'pe LVP, part number.7669-10000-02, Penetration conductor size - #6AWG, rated continuous current - 28A.

2.

Rated short-circuit overload current

550QA for 0,0167 seconds (maximum duration - 0.1333 seconds),

3 *

. Electrical Tests shall be per IEEE Std. 317-1976, as follows:

a. Prototype Tests

1. Conductor Continuity 2,

Dielectric Resistance

-.. '~

~§Yd.~t~9P Resistance

/,1 * ~'!;~Q. C~mt1Puous Current

~~~q. ~p.q;rt Time Overload Current 9,. ~

~~~~¢t *Current and Duration "f,

~~~~Duration of Rated Short Circuit

~~t

~~~; ~ §Q.QJ.tion to the above electrical tests, the

~g~~§J. =t~~=ts of Article 6 of IEEE Std. 317shall

- Pfi! ~~~~~g. Test. data is scheduled to be available mtg ~~9 *

. !,. m@~~~:tn~ ~trength g,

Y!~~t1:~~ Jiesistance C@~4Y~i~? C~ntinuity-and Identification

N~~~;. ~gMmE;~ tests shall 'be per Article 7 of IEEE

~~4, j!?,. T~~~ data will be availab~e after fabrication.

c~~~~~~ february-or March 1979}.

~'

~~~!~~ ~esistance N@~@i ~i~~~ tests shall be per Article 8 or IEEE

~"\\c!, ~!~,

'f~~~ ~ta will be available after installation

{~~!1m_@.~~1 m;l.d to end of 1979}.

g,

~di~ V~l~~~ (~~~~~ ~~ 1,~00V ac)

N@ ~!~ui~~ ~~ R~W ~I ~~~~ penetrations. *

!U~

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)

I

. :x. **~-

~ 3 -

Existing Penetrations I.

Low Voltage ( 150. - lOOOV ac )

A.

Circuit Information

1.

480V ac Pow~r Center 6A ACB52-25l4 Feed to Emergency

.Condenser Prima.17 Steam Inlet Valve W-100

2.

Protection Devices

3.

a.

Primary: !iblded case circuit breaker 11TF." Frame with 15A thermal trip rating and 10 times ma.gnetic*trip setting.

General Electric type TF5 - see.time/ current curve

b. Secondary:* 480V switchgear type air circuit breaker with 600A continuous current rating. General Electric type AK*l-25 with overcurrent trip device EC-1.

See time/current curve in Figure 10 (right side) on page 5-IV-13 and associated expl~tion on page 5-IV-ll.

c :: c.*. -

Maximum short circuit current available for this current is 51.)A.

(RMS symmetrical } * -

4.

External conductor size:

3 conductor #12 AWG.

B.

Electric Penetration In.formation

1.

Bechtel design. *Dresden Unit 1 penetration number Hl.09.

Penetration conductor size is #12 AWG. *Rated continuous current is UI18.vailable.

2.

Rated short circuit overload current*is unavailable and the duration is unavailable.

3.

Electrical Tests:

Insulation Resistance, Prototype test re-sults were all "infinity" on the most sensitive scale of the megger *.. *.See Bechtel Electrical Penetration Report E-1,

e

\\ (aev. 0 dated July-7; 1958} Article 5,J, Note:

This Bechtel Report E-1 also describes the mechanical tests and results, II..

Medium Voltage {greater than lOOOV ac J A.. Circuit Information

.f..

l.

4160V ac Bus l1 ACB 152-1110 Feed to Reactor Recirculating Pump G-l7A.

2.

Protection Devices

a. Prima.17:

4160V switchgear type air circuit breaker rated for l200A.

General Electric Ma.gneblast Type AM 4,16-250 with a Type MS-lJ operating mechanism.

Overcurrent relays provided are:

1.

Two GE IAC66 phase time over current with instan.-

taneous element *

2.

Two Gp: thermal type TMC, J.

One GE PJC ground instantaneous overcurrent, See time/

overcurrent curve*GES-7004.

b. Secondary':*.4160V switchgear type air circuit breaker rated for 1200A.

General Electric Magneblast Type AM4,16-250 with a Type MS-lJ operating mechanism.

Overcurrent relays provided.are:

1. *Two GE IAC77 phase time overcurrent,

2.

One GE IAC77 ground ti.me overcurrent, See time/current curve GES-7005A.

J.

Ma.rlmum short circuit* current available for this circuit is 14,*oOOA (RMS symmetrical).

4. External conductor s:tze:

1/0 AWG triplex.

~-.***-~*****-.- ---* --- -**

- 5 ~

B.

Electric Penetra:tiOn Informaticin

l. **

Bechtel design.

Dresden Unit 1 penetration number HJ.JJ.

Penetration conductor size is #1/0 AWG.

Rated continuous current is umvailable.

2.

Rated short circuit overload current is unavailable and the duration is unavailable.

J.

Electrical Tests: Insulation Resistance. Prototype test III.

DC Power

.results were all "infinity" on the most.sensitive scale of the "megg~r". See Bechtel Electrical Penetration Report E-1 (Rev. 0 dated July 7, 1958) Article 5.J.

Note:

This Bechtel Report E-1 also describes the mechanical tests and results.

A~. Circuit Information

1.

125V de Powei*.Center ACB 72-6JJ Feed to Reactor Enclosure Drain Tanks Isolation Valve M0-506 *

. 2.

Protection Devices

a. Primar:1:

Thermal-magnetic molded case air circuit breaker, 125V de 2 pole with 10,000A interrupting rating.

20 A trip rating. General Electric Type TF-20.

See time/current curve

b. Secondary:. molded case air circuit breaker, 250V de 2 pole with 10,000A interru:Pting rating.

225A thermal trip only.

General Electric type TJ225.

See time/current curve J.

Marfmnm short circuit current available for this circuit is 272A.

4.

External.conductor size:* #12 AWG.

B.

E;l.ectric Penetration Information

1.

Bechtel design.

Dresden unit 1 penetration number In06.

Pene-tration conductor size is #12 AWG.

Rated continuous current is unavailable.

2, Rated short circuit overload current _is* unavailable and the duration is unavailable.

J.

Electrical Tests: Insulation Resistance.

Prototype tests results were all "infinity" on the most.sensitive scale of the "megger".

See Bechtel Electrical Penetration Report E-1 (Rev. 0 dated July 1; 1958) Article 5.J.

Note:

This Bechtel Report E-1 also describes the mechanical tests and results.

9.

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.l.MGltNT IN OPtN AIR __ c:ot.o START i-4 l~l"~AMC £.!.LPOl.CS NONA0.JU$TAbL.t TH~RMAI. +!IOX*A0.JUST.1.Dl.t MAC.lll!:TIC: TRIP NO. K2 !5-5C t l

.. GC:HERAL ~~ ELECTRIC..

DATE 5-l5-53

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. CIRCUli PROTEC.TlV~

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m~n1um:.

internlE:d.iate, and minimum. The

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=--*-*-*_;~ ~ppuig time.fer e:ich of the~e. m the same orae.r,

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thesiime order, are 0.399, '>.2GG. a."ld 0.133

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'Figtr~e 9.. Bus CompartriH:nt..

.. of ~r1wout Swttchge::i.r tJ,1it.

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.~jstic. 'A device.identified.as ic.;.*3*me:ins th.at it consists of a long-time element with a..LC*

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c~i~c~eristic :i:id :in hist.1Ilt"L'leous element.

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.~.par,t.of"thc ele.ct1*ic:il system only the brc:1kcr nc:ircst the fault should tt*ip.

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ATTACHMENT II Dresden Station-Unit 2 Commonweal th Edison Company

Docket No. 50-237

.:. - ----*---*'-'-- --7-:*

=--*

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~: ___.:-=._-~.-~*** X-202D, i-ated at 6000 HP 4160V 60 cps. IFL 724 ampere

. --*-... --- ~---2.. -

See (j) below.

_::=.~~:::~-=--~~~~::_.:. 3*:*.** Marl.mum Short Circuit Current

--*..... **----*--**-**-... a. The ma:rlmum_short circuit current available is limited by the reactance of the recirculating pump M-G set generator.

Calculations made at the time of order indicates that a three.phase short circuit at the load terminals (inside the dryw,..ll}.of the penetration could produce a fault current of approXimately 4,300 rms symmetrial amperes in each of the three phase conductors of the penetration.

(Calculationa attached)

a. Externu l/c 1000 ~cm, 5 KV

b.

Internal~- 1-3/c 750 mcm, 5 KV

- -*-- * -*B.- --*Electrical Penetration Information

-* **--** --*-. ---1. -**-. Manufacturer's Information a *. General Electric Type NSOJ, Rated 5 KV

b. Each penetration has 3-1/c 1000 mcm 5 KV cable

c. Continuous current rating 735 ampere

2.

Rated short circuit current 4300 ampere

a. Starting current for motor 3800 amp for JO sec.

- - - ---~

II. j.

Electrical Test - Reference.. GE Qualification Testing *

a. Continuity Test

b. High Potential Test ~.withstand voltage 2 ti.mes rated

_voltage of cable insulation plus 1000 volts for one

. ininute.

c. Insulation Resistance Test.. resistance greater than 1 x 108 otims at 500 VDC at ambient temperature.

d. Fault Current - See General Electric report 994-75-011 Qualification Test Summary 100 Series Electric Penetration Low Voltage Power Penetrati~n

---~---=-:---~----~~A-~---~ Circuit ~ormation Typcial Circuit - Recirculation Pump 2A Motor Operated __.

Discharge Valve uo2:..0202-5A, 14BP 480V 6 cps Ivr, = 20, Drywell Penetration X205E.

a.

Primary' - General* Electric Type TEF molded case circuit breaker with a 50 ampere thermal/magnetic trip coil.

Interrupting rating 14,000 amps.. (See attached ti.me/

current c~es).

b. Secondary.. General Elect1'ic Type.AK-2-25 circui.t breaker with a 400 ampere thermal/magnetic. trip coil.

Interrupting rating 30,000 amp.

(See attached time/current curves).

J.

Ma.rlmum short circuit current 7,525 ampere RMS (calculations attached.)

4. -..

Conductor Size a:.

1-3/c, #10 AWG, 6oav re.ted B~ *Electrical Penetration Information

-1, Manufacturer ~s Information

a. General.Electric Type NS04 rated 600V ac

b. 3-1/c, #10 600V c

continuous. current rating 16 amps

2.

Rated Short-Cil"cuit Current 8000 amps J.

Electrical Test

a. Continuity.Test

b. High Potential Test - withstand voltage at 2 times rated voltage. of cable plus 1000 volts for one minute.

c. Insulation Resistance Test - resistance greater than 1 x 108 ohms at 500 VDC at ambient temperature. *

d. Fault Current - See General Electric report 994-75-011 Qualification Test SUilllilal'Y' 100 Series Electric Penetration III.

DC Power Penetration

None Inside

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Subject:

Dear Mr. Ziemann:

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