ML18043A572

Forwards Info Re Atypical Low Voltage & Medium Voltage Containment Penetration Circuit & Direct Current Power Penetration Circuit.Concludes Simultaneous Occurrence of LOCA & Mas Fault Condition Need Not Be Considered

ML18043A572
Person / Time
Site:	Palisades, Big Rock Point  File:Consumers Energy icon.png
Issue date:	03/19/1979
From:	Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Ziemann D Office of Nuclear Reactor Regulation
References
TASK-08-04, TASK-8-4, TASK-RR NUDOCS 7903260213
Download: ML18043A572 (13)

Text

Gener<'\! Offi:-:es: ~12 West Michig~n Avenue. Jac".<.son, Michigan 49'201

• Aro:;a Code 517 786-0550 r.Iarc:h 19, 1919 Lirector, Nuclear Reactor Regulation At.t Mr D :;:, Ziemann, Chief Opere.ting Reactors Branch i~o 2 US :ifaclear Regulatory Commission

~-iashington, DC 20555 DOCI<...t;TS 50-155 AND 50-255. - LICENSES DPR-6

.A~TD DPR PALISADES AND BIG ROCK POINT

?L.UVTS - EUC'I'RIC PEI:JETRATIONS OF P.RACTOR

'.:;0i'.?J:AI~TI'1:81IT, SEP TOFIC VIII-4

~iRC letter dated tecember 8, 1978 requested GonsLlID.ers Power Company to provide infor:naticn pertaining to a typical low-Yoltage containrne!l.t 3_Jenetration circuit, a typical medium-Yoltage penetration circuit and. a typical direct current power penet.rat.ion circuit at Palisades and Big Rock Point. ~he requested ~nfor~ation is proviced in Enclosure (1) for Falisades and in ~nclosure (2) for Big Rock Point.

Consume.rs ?ower Compa~y is concerned that the assumptions inherent in the intro-duction to your ~uest.ions are unnecess2.rily severe. These assumptions appear t.o oe taken directly from Regulatory Guide l.63 dated July 1978. Section D of tne

uid.e states that it will be used in the evaluation of submittals for construc-t.ion permit applications docketed after August 31, 1978. The original Guide was issued in 1973. The Palisades ar..d Big Rock ?oint Plants are, of course, con-siderably older than this.

The implicat.io.:::i that a short ci:ccuit condition will develop simultaneously wi-;;h a ;:'aili.rre of tne :;:iri.:r!.ary prctective C.e--rice and at a time when contairi~ent in-tegrity is requir<.::C. see:ns to be ~induly ce>nser7ac;ive in tnat it exceeds the requirements oi' t11e siEgle: fai:'..u.re criteria.

7903260 J./3

2 Consumers Power Company concludes that this implication may be based on a scenario wherein a Loss of Coolant Accident (LOCA) occurs, causing hostile environment in containment, which in turn causes the worst expected fault.

The single failure criteria now requires that the primary protective deYice be assumed to fail. The conclusion that LOCA conditions necessarily cause worse case faults even in "nonqualified" circuits does not seem to conform to typical design conditions or experience. A number of containments have been pressurized in the past to design (or close to design) conditions and circuit faulting was not observed. Secondly, the "nonqualified" circuits within containment usually contain the same general materials and equipment as the qualified circuits. The difference is usually only the documentation provided.

Consumers Power Company concludes that the simultaneous occurrence of a LOCA, a maximum fault condition and failure of the primary protective device is sufficiently improbable that it need not be considered.

David P Hoffman Assistant Nuclear Licensing Administrator CC JGKeppler, USNR.C BCC SEP Owners Group

Question(l) Circuit l Circuit 2 Circuit 3 A.l. Typical circuits Power to primary Power to pressurizer Power to bearing oil selected coolant pump P50A - relief isolation lift pump P81B-125 4160 VAC valve M0-1042A-48o VDC VAC A.2. Provide trip curves Attachment l* Attachment 2* Attachment 3*

(current versus time) for the primary and secondary protection devices A.3. Maximwn short circuit 30,318 amps** 417 amps** 2405 amps**

current available to (including max off- (offset insignificant) the selected pene- set - 44,870 amps) I-'

\0 tration circuit -l CX>

A.lf. Conductor size 11wo - 750 MCM per One - #12 AWG per One - #1/0 per pole external to the phase phase One - #8 shunt field electrical pene- wire tration B.l. Manufacturer's Viking Industries, Viking Industries, Viking Industries, electrical pene- Inc Type P-1, Part Inc Type P-5, Part Inc Type P-5, Part tration identifi- No 23-0052-0000 No 23-0027-0000 No 23-0027-0000 cation number Size of conductor(s) 1500 MCM //12 AWG #1/0 in the penetration E{ Rated continuous 790 full load arnps*** 14 full load amps*** 76 full load amps ****

~. current for each g conductor

~

<D I-'

(l )Question

. numbers refer to the numbers used in NRC letter dated .December 8 , 197 8 .

Question(l) Circuit 1 Circuit 2 Circuit 3

!:d M

15,000 amps tJ.l B.2. Rated short circuit 80,000 amps 1,, 500 amps 1-i::J 0

overload ~

tJ.l M

Duration of rated 3 cycles 3 cycles 3 cycles t-3 short circuit over- 0 load LJ M

B.3. Description of all electrical tests of See previous submittal dated 12/8/77 to J G Keppler from D A Bixel, Docket 50-255, License DPR-20, Palisades Plant - Response to IE Bulletins

!~

e these penetrations 77-05 and 77-05A ())

and results of these "

tests (l)Question numbers refer to the number used in NRC letter dated December 8, 1978.

• In the case of breakers with more than one trip device (such as magnetic and thermal trip devices), the entire breaker was assumed lost.

• • The faults were conservatively assumed to occur at the penetration inside of containment.

• • • In the purchase specification, the Architect Engineer provided these current valves (on the basis of listed load currents) to the penetration manufacturer speci_fying that the conductors and connectors

~

f-'

inside the penetration be sized for these load currents.

• 0 Ul

~ ****Table 17-23, Standard Handbook for Electrical Engineers 10th Edition, Fink, Donald G and Carroll, m John M, McGraw-Hill, Inc, 1969.

~--~~-*----_ ___,9...___ _ _ _ _ _ __,.,..___ _ _ _ _~*

( ..--.......

Attac~~at J.

CURRENT IN AMPERES g g ggg 40 !iD 90 70 10!10~ § : ~ ~ ~~~taoa 1000

.5 .£ .7.B.91 S B 7 9 910

" 30 700 700 BOO 600 500 400 300

, 1oa BO 70

• o 30 10

~ * ::l:;::

z r*

5 v '

z"'

""'z "'"'

z"'

2 0 zR 1

.9

.1

.8

.5

• 3

.1

.1

• 08

.07

• DS 5 6 7 8 910 ,. 40 !O 60 70!DSO~

CURREl\I IN AMPERES )( /00 Fo, ................. ; __U*'H,::.... ~a~:~:~;-~~~:~~;7::T~:~;;:::::::::::::::::;~~~_t:~~'~:.RE;~~--~-~-~~~~~~'.~~'.~--~-~~\:~s -**-----------------------------------------------------

BASIS FOR DJ.. T-A St~r:::::'..::.:""ci!----*-**-------------------------*-*****--*-************* Dated**-*****--------------------------*****---------------***** 1

!.. T ~m* rr.r.df' .:: **..**.**.*....... fJ.c.~------.Volts .c..e. at. .............................. p.f .. S::i.rtin; c.t 25C "ith no ini:.ic.l load............... !'o *. _:.:!:.:.:_;_;::_:._i.:~::1 .....::..'.....-...i ............ .

I

.. C:.:n*t:~ ue piot:~c! te .... *-****-*----***-**-**************Test poir.ts so \*ariatiom shouic! bt' ---****-********-***-*------*-*****-*******-*-----  ::>ate ... .?."~L.,_J ....... L-:.7_:1 ____________________ _

Tl~C:-CL'RP.E:NT 46 5257 CH/..R..i..CTER£TIC

\ ,

Jl.:..3l:l3..1..:>'f'l:i.VH~

l.!'-131::ii::ln:::i*::i:,.,11..:.

1--= ~-"-;~~,-~~:*::I ******------p'20! i:>P!t::; .J:.! t;1!-"" JSZ ;a .::.:p:i::s 'Td **--------*-----*-------------*;tr :>"'J il{O.\"*--~~~;;.-****--*-****--------;~ OJ?':.!.: .;:.;1_:.

---

***-----**---*-------------***----- ?3P?Q ----***-***----------------------***----**----**** .....* '"P.:'"'?Ui.??S V .l VG ~o= S!S""-;"3:

---*******-**--------************---*--*u1 *s:.iun Jin.:! ******::;?5~"Jl:..:U/V *::;; *7.71*7.~""J!,?:::?r* ~-?Ii?~/ **-;;r;-** ".:/,*:-~5y*--1 _:

I  ;:::.\~.;J JI.LS;';:i3.lJ¥1fr':-iJ Qf

.:x::BC:1J*'3~'\11. ---------*-------**********----,.*:*~-~----:.*:..~----

x sni:::dlW ~I .L'Hllllfl:J to*

o*

LO"

,,.ao* ~.:r t' ,.

l

~  ::l z "'

g .

z

~ --z 09 CL 09 009 COi OD! CCL 006 '"

gos-01 CL 09 a; OI' ot ., ~ s* ::r :.:

S'31:!Jd1~v NI .LN:nnm:i

l t

.,., ~ ., n ..

ll.!.3~3.!..:lYl:::l'fH::>

LSZ~ 3)' J.....,.3<:1.':::ln::i*3;...i1..:.

- ---****--******************** *********-****- - Jq ?!'1.0l{i liUO!*:?!-'":?.\ 09 SfU!Od ;i3.l ********-********************* **...* ;::: ?d;;OJ':! :;:"J' <;:~.*..!:"::) *::

............ p<?O! P!H'.!! o~ '*P!--~ ..::;<:: ~<! .':U!1~*:s 'Td *********-------------------****\]$!'Cl ~ljO;\*;-**~x- ***- -----******--**** ;'t!' d?~t.:.: ~:~OJ.!. . :

• -------------****------***---------------------- - -* -* par~a *---*-*--****---------------------*-** .... ****- i?~"?:!":::; 'i.l Y<l "dOJ S!iVS I**** * --*-****-------*--*-****------------*--**u 1 *s'1un .Hn.:i*** ******************:a*f.:;z**-*;::*.rr1:.::: *::r;-- **...**:*c**-;:-::-rr~ *1-;*~ ~~.:!

5'3.\~:1J JI.!.srn~.L:J';(f';-"HJ l.~~3:~n:.1J*::r~*;u  ?-~-:-7;1*... '?'a**---

I OIX 53o3dlW )II .LK?:ln!O:J

..T..;

...;:--;:--.;_..c;:.......,..:;-~-=.,-----,~~.,....:'--'-..;:...~=__;:=:....,...~=...,...~~,_-+~=;__.....,.~~::..:::c:,:..:;:....:..;....::,:....c:,:___;'~'~--~'~~~....:.,:.-'--;._;:~__;:~.;_--;~~"'--~~~..;....::....:....:....:_~,,.

to*

SO" LO" eo*

oo*

I

' ~

~:_,

009 COB gosoaoL os D!i at Ot DLG II L 9 !i ,.CCCL S3~3dlW NI .lN3IDIO:J

\

RESPONSE TO DECEMBER 8, 1978 NRC LETTER - BIG ROCK POINT PLANT REQUEST 1 Identify each typical circuit selected.

Response

Case A - Power to the reactor clean-up pump (typical low-voltag~ circuit, 480 V).

Case B - Power to the recirculation pumps (typical medium-voltage circuit, 2400 V).

Case C - Power to the emergency condenser outlet valve (typical direct current circuit).

REQUEST 2 Provide the trip curves.

Response

.case A - See Attachment 1 ..

Case B - See Attachment 2.

Case C - See.Attachment 3.

REQUEST 3 State the maxim.um short circuit available to the selected penetration circuits.

Response

Case A - 1,541 amps.

Case B - 18,450 amps.

Case C - 635 amps.

REQUEST 4 State the conductor (external to penetration), size for the circuit.

Response

Case A - 3 conductor 12 AWG.

Case B - 3 conductor 4/0 AWG.

Case C - 1 conductor 12 AWG.

Enclosure (2)

RESPONSE TO DECEMBER 8, 1979 NRC LETTER - BIG ROCK POINT PL.Al~, PAGE 2 REQUEST 5 State the manufacturer's electrical penetration identification number, size of conductors in the penetration and rated continuous current for each con-ductor.

Response

Big Rock Point penetrations were manufactured to a design specification pre-pared by the plant Architect Engineer. No manufacturer's identification number exists. The identification number in the following table is a Consumers Power Company number .

ID Iiiumber Conductor Size Rated Continuous Current(l)

Case A H-43 le 8 AWG 34 Case B H-87 le 4/0 AWG 176 Case c H-45 le 8 AWG 34 REQUEST 6 State the rated short circuit overload current and duration.

Response

See attachments.

REQUEST 7 Provide a description of all electrical tests* .for these penetrations a:.nd state results of these tests.

Response

The penetrations selected are identical to those used in Dresden 1. Letter from MS Turbak (Commonwealth Edison) to Edson Case, December 9, 1977, dis-cusses the environmental qualification of these penetrations. The specification called for an electrical test in which the penetration "units carrying the insulated conductors were meggered with a 500 volt megger and all readings read infinity on the most sensitive scale. The readings were taken between adjacent conductors and between periphery conductors and the pipe."

(l)From ':L'able 27, Page 14-213, ?ender and Del Mar; "Electrical R..'1.gineers Handbook Fourth Edition,". Wiley & Sons, Inc, 1949.

Enclosure (2)

RESPONSE TO DECEMBER 8, 1979 NRC LETTER - BIG ROCK POINT PLAl.IJT, PAGE 3 Attachments 1-3 show the fault current, the protection device trip curves and current-time correlations. for when the conductor center line, and insulator inside wall become molten. The correlations were calculated by solving heat transfer equations and assuming the following:

l. No heat transfer out of insulation (or jacket, if jacketed).

2. Instantaneous fault current applied ..

3. No credit taken for the fact that the conductor attached to the penetration is smaller and may melt first thus opening the circuit.

This calculation was performed because the thermal withstand capability has not been tested.

Enclosure ( 2)

e 0 0 0 0

~

0 0 Cl Oe!IO 0 0

~

0

~

! g g

: 0

~

1'GQ soa 800 1aa SQQ -......,,-

~oa 400 lOO 200 100 90 90 10 so

~a 40 10 z

8 Cl)

• .\

)

..../

.03

.Cl

.07

~'i:f~:!::'1~~;:==='~:;:;;;:;~;.;::;~~~f;:;;~.os

.cs

';.,,.--.-.~;.t::~-J".l="f:""1!>.::":':t!~~~;;:;:::::::;-:t-,C::-:::+/-i:::======:r7::::0:-:::,=:::::::""'::=::::::==---==7.===r:"'t::::::-=::::==::i=:-=-:O-::::::::::+/-':'i:':=~========~~="'~===='='~='="="-:7'l

.l1 40 sa SiJ 10 ao'3c~ 0 0 0

~

0 0

0 0 ~~

~o

~

0

~

CtJRR£.'ff !!'I .:..~IPERES ~10

... '0.1.s. ..~ ...Po....-.r. .............. TlME-CURRENT c:-lARACT'ER!STlC CtJ::tVE.S

!'"or ....**...*...* C ~,a,~- lJF. f\.11'<\.F-................................................ Fuse Llnks. ln....................................... . ..... j BASIS FOR DATA 3t>"ci,rds ......................................................... Da!ed ............................................. ........ . ..

1. Tesrs J":":.ade ~t.*--*--*---****------ ..4ei.O ..Voits .J... c "\t. ... ----***--**********-****** p.f .* Startin~ :it =sc with :io initial load .............. .  :-;0-------**** ****-*** .....

. C~r1es ue ?iotted :o **-****************----**--*-******-**:'l!st ~oints :10 va.ri:Uion! 'hould be ....... *-*******-*--***** .... ."............ . Date ....... '!.-~*~-~- .,, *

'T'!M"E*Ct..!'IRENT 48 5Z57 CHAP.A~i:t9TIC

CURRENT JN AMPERES tl!OOS s a 1 s g 10 20 30 40 50 60 70 8090~ sg o a D

~

a al g g~

!DOG 900 900 800 BOO "700 700 300 600 500 500 400 400 300 100 90 BO 70 so so 40 10 5

• z Q

~

r...

2 z0

<ll I

.9

.a

.7

.s

.s

.4

.oa

.07 JD 4D so so 10 aoso~ 000000 Q

c:

I

~mo 00

i

':l

> 0

.Q 0 0

0

~

::. <::I ':::I r-- ~ m~

. CURHENT i:-1 A:'.IPERE.5 >< IC I

-0 .J:> lG._1(oc:.l::. ...f1o IN 1"'.'...... --*-***---- Tl;\IE*CURRENT CHARACTERISTIC CURVES  !

For .. rf..~p.,r;.;__;:o .R. ..."'.Rs~.\ 1<.C- *-* P.~1.tl\..\L \'>l<:l.'. _\._ _____ *---------*---* *----- Fc*e Un ks. In.----------------*--*--*----*-*--------._ .. - ---*I BASIS FOR DA TA 5:.nci>rd*. .... . . ..... -**-*------------*-*-*--------***-*--- *-- Dated------------------*---*----------------*--------*-----*-*

l. Tosts made °'**----*--*-*--*-2400..... .Voits "-"at. ........ --------------*-----*- p-i .* Startin; at 25C -.;,~ r.o initial load------**-****- j No......

.2. C:.:.r.*~, are plotted !o ..................................... Test ;oints so variations sflouid be.*--***------------------.---*****-***-*--*--.

I

] Date ...

• • =-* . -~-- .t:;J;

-:'3.... ."/..4"...... 7. ,

I TIME-CUr:l.REHT 48 5257 CHAR ... CTERSTIC

e A-rrAC. l'IM EN"!" 3 e

CURRENT IN AMPERES a

0 0 0 o o a ooa 0 0 o o a cog Q

~

0 0 Cl 0 Cl CICICI

.7 .9 .9 1  ! 6 7 6 910 30 40 50 ea 10 aogo! Q 0 Q

~ ~ g~ N Cl Cl c,g 0

CIQO

<lll Cl-100(!

900 8DO 700 700 800 900

!00 soo 400 <DO

---

20070 300 100 90 80 so 40

L'.:-~'.i~\'.:'i: ,;,,~,;;;h::::i-i* j,;1 '

0 c:: s;:.

i5 u

• 4 -

~

CJ)

~

~

!;:;: :'.:. ~+~--~ -~;:-'.~;;

.7 ::~: .... ;*:: ... - - - -~*~:.::_*:::

.6 1:* *- .... :.*:: **-**:::: :.::.: :~:.:~::::::::::::. :: *;~.::.;.:

.,.i .1.:_'ct~&4kft~~B;*~~~c~tf:~,~~B~~~~'.~~=~;~j~~:~~;-~~;,1~;:;t~~~~~i~m~~:t~~~~'..:~~~~~~~~:!~T-~~~~':,~~~~~r~~j;:~::=:~;;

[D" ;'cc,~~i'CCETf[ J[i~~1~f~~#§~~~ rec*~~~~ ~~~~~,~~~~:~= .

.OJ 0

.5 .S 1.a.3 L J 5 6 7 8910 :a ~IJ 40 ~US07013.0905 g  :§ g g gggg~ g g g g g53:3'.§

- "I M "I' ..., <O ,_. ;:;) ci <.::I :ll <:: C Cl ~ O <::-:: O *~

CL'RR£:\'T li'J A~1IPERES - ~* '"' .... "' ~ - ::. *n -~

-a, c:;.._e..,.c:J:. ..P.::u.Nl"'................... Tl~!E-Ct.:RRE~T CHAR.\CTERISTIC C'..!RVES For .E"~~y' .. C.:u.~Oe::NS.i=.;:.. Cu:D-~. 'viv...\-10.l.CX..~.. Fuse L;o;.,, In ...*. *--*-------**-**--*-------*-*--*** .. '

• • • • 1 DA.Si.3 FOR DATA .5~.1r.C:l.r"1.i ................ -------***-****---------------****----Dated--------------------------------------------------*-*-*-

l. T1~:;ts made at. ***.*.*........ J.2..~---------Yoi~l ~t .........*...*.**....******.... ?-i.. S!o.rtin;; at 25C *Nith no 1r.itiai !oi:!.d ....*.*...

. C:.irvl'5 3.te piattrd to ................................** 7cst points so variations shouid be ..*. ------***--****-*****- *.....*.*.....*..... ~:~~~~~~~~~~--~~!~~?~:~-.7.~ i .. -

K...E TIM£-CURR£:NT CH~.=< .... CTE~STIC 48 5257

<LLIFl"!.L ll t.'lu:n co.