ML20148L862
| ML20148L862 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon, Millstone  |
| Issue date: | 10/26/1978 |
| From: | Cleveland J GENERAL ELECTRIC CO. |
| To: | Allison D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20148L837 | List: |
| References | |
| 781016-01, 781016-1, NUDOCS 7811200384 | |
| Download: ML20148L862 (13) | |
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G E N E R Al h El.E CT RIC NUCLEAR ENERGY PROJECTS DIVISION GENERAL ELECTRIC COMPANY,17s CURTNEA A'.E., SAN JOSE. CAUFCRNIA 9s125 MC 682, Ext. 52996 October 16, 1978 U. S. Nuclear Regulatory Ccanissien Division of Project Management Office of Nuclear Reactor Regulatien Wasnington, D.C.
20555
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Attention:
Mr. D. P. Allison, Project S nager Light Water Sctors Branch No. 1 Gentlemen:
This letter is in response to questions raised during a meeting August 30, 1978 between the General Electric Company and the NRC's Light Water Reactor Branch No.1, to discuss the qualification of electrical penetration assemblies su; plied for the Diablo Canyon Project.
Sub-sequent to the aforementiened meeting, additional information was requested by Division of Operating Reactors regarding pene: ration assembly repair and the acceptability of repaired assemolies.
The follcwing sumari::es the NRC interests addressed herein:
1 Justification of qualification by similarity of the Diablo Canyon penetration assemblies, 2.
Verification that repaired assemblies are qualified for their intended application, and 3.
General Electric knowledge of penetration assemblies which have been repaired.
RESPONSE TO OUALIFI(.ATION BY SIMILARITY to this letter pr:vides the rationale for cualification by similarity. Diablo Canycn utilizes the canister design assembly, currently in use in a nuccer of o;erating reactors, e.g., Millstone 1, Oyster Creek, Monticello, Dresden 2 & 3, Quad Cities 1 & 2, etc. The canister design is envircnmentally cualified due to the similarities in its design to the 100 series electrical ;enetration assemblies which have successfully completed several simulated LOCA environmental cual-ification tests. Attach ent 1 cencludes that the results of the 100 781120 o'38y
i G E N E R A L (j) E L E CT a l C Mr. D. P. Allison U.S. NRC Page 2 October 16, 1973 series environmental qualification are directly applicable to the canister assembly due to distinct design similarities, i.e., epoxy, steel and conductors. Also, relative to environmental considerations the canister assembly is a more conservative design than the 100 series.
(The 100 series LOCA environment qualificatien test report was submitted to the Power Systems Branch during the August 30, 1973 meeting.)
ENVIRONMENTAL OUALIFICATION OF ELECTRICAL PENETRATION ASSEMBLIES EXHIBITING _ GAS _ LEAKAGE
~~
At:ach. ents 2 and 3 are reports of LOCA and post-LOCA envircr. ment cualificatien tests, perferred on two :enetration assemblies received fr:m.'tillstene 2.
Both assemolies were found to be deficient, i.e.,
exhibited gas leakage in excess of specification. The penetrations were returned to General Electric C:mpany and subsequently subjected to the year-long environmental pualification test described by Attachments 2 and 3.1 The test demonstrates that at~ temperatures well below tha4-I.e.&
pos tulated to cccur curing a LOCA)(ics:-LOCA';c ;;r(ee:rr!), the stresses which created the fissures were alleviated such that a leak tight b:undary (per the re:uirements of IEEE 317-1972) was fermed.
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Feretratien assemblies exhibitinc excessive cas leakata in. he field are field re; aired.
Tne re: air consists of colling, by a34?G%,~a cnemically compatisie resin into :ne fissure. The repairec assemoly is then gas-leak tested pursuant to IEEE-317. Periodic surveillance of the seals serify the acceptability of the repair.
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- n nc case has General Elec ric re: aired a penetration assembly -nere b::n redundant seals exhibitad leakage and wnere the fissure was so lar;e that re; air was impcssible. Only General Electric C:mpany autnor-i:ed :erscnnel have made :nese repairs. No :enetration assembly ex-nibiting gas leaks pricr to final release to a cus 0mer has ever teen shipped.
Esth canister and 100 series asse-blies employ an epoxy system a: :Se electrical is later and part :f tne :ressura barrier.
In botn ces ;rs tnere is a circur#erence of steel witn e:cxy em eded therein.
E:o; exnioits ena *:-:so cr more orders of eagni ::e greater :narnal
<c.-t tnan steel. Any fissure in the epoxy is the result of shrinkace :
mechanical f.act.. e.
1 Eviden:e
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'G E N E R A L @ E L E C T RI C Mr. D. P. Allison U.S. NRC Page 3 October 16, 1978 During any postulated incident where containment temperature rises, the epoxy will necessarily expand and soften, causing the small fissures to seal. The aforementioned repair procedure ensures that at any tem-perature elevation a gas tight seal will be provided.
General Electric's recomendation for periodic monitoring of the seals
.o assures that annoyance leakage will be remedied, and that any remote postulated event will not violate the containment barrier through the assurance that two reliable seals are in place; A'.c.;.:;h 411 qualifica-tions have demonstrated that only one seal is necessary to maintain containment integrity.
Each epoxy system currently utili:ed in General Electric's electrical penetration assemblies has demonstrated sufficient margin to maintain I
pressure integrity (tested at 102 psig saturated steam conditions).
The I
Millstone 2 qualification test demonstrates the relative mechanical properties of epoxy and steel. Therefore, the Diablo Canyon 1 penetration assemblies will maintain containment integrity in the unlikely event of a LOCA.
Very truly yours,
{
James W. Cleveland, Sr. Engineer SWR Product Standards l
JWC:bp/1048-50 Attachments cc: Mr. G. C. Lainas, Chief I
Plant Systems Branch U. S. Nuclear Regulatory Commission Division of Operating Reactors Mr. R. A. Young
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j Pacific Gas & Electric Co.
l 77 Beale Street, Ra.1805 San Francisco, CA 94106 bec: G.
nerwood i
3arton A. Smitn Mr. L. Davidson k,. R. Morgan Nortneast Utilities Service Co.
W. H. D'Ardenne P. O. Box 270 N. G. Lurla Hartford, CT 06101 R. Schuster R. O. Brugge Mr. J. F. Kilty J
Operating Plant Services bp/lCa 0
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l ATT40HMENT 1 l
4 COMPARISCN OF CANNISTER AND 100 SERIES PINETPATICN DESIGNS 1
The 100 Series Electrical Penetration design can be used as the basis for qualification of the cannister design because of the direct corr' elations between the two penetration designs.
The 100 Series modular design was develeped by reducing the 12 inch cannister cencept to a 2-1/2 inch module.
The materials that would be expcsed to the LOCA environment are the same in both configurations.
These materials included steel, XR5126 epcxy, electrical conducters, and potting beards.
Both the cannister and the modular design used an epcxy system as the electrical isolator and part of the pressure barrier.
Th e cannister design included a steel header plate embedded in the epcxy l
l and the conductors were routed through this plate before being spliced together and held in place by the petting beards.
The 100 Series modular design has cnly the epcxy ec provide a barrier l
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between the envirennent and the pin type ccnnection.
The pin l
connections in the medule are less than 1-3/4 inches from the I
environment as compared with a minimum of 3 inches to the splices in the cannister design.
The spacing between conductors in the 100 Series design is closer than in the cannister design.
The conductor center-:c-center distance in the =edular design is.140 inches as cc pared te 306 inches in the cannister design for the same si:ed conducters.
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The distertion of the splices during crimping may result in a y
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reduced distance between cendue crs.
Mcwever, the reduced distance is still further apart than the spacing between conductors in the 100 Series design.
The fc11cwing should be noted in summaricing the two penetration designs:
1)
Overall design configuratiens are basically the same 2)
Materials subject to the LOCA environment are the same 3) 3cth designs were built to the same overall quality standards and design parameters l
Additional conservative features in the cannister design are:
- 1) the separation between cenducters is greater than in the
=cdular design, 2) the splice cennecticas are a mini =c= cf 3 inches frc= the exposed surf aces as ec= pared ec 1-3/4 inches en the modular design, and 3) the cannister has the additional p ctection of a steel header elate embedded in the ec. ox'I.
Based on the design similarities and the =cre conservative features in the cannister design, the qualification testing
.eerfc= red en the 100 Series =edules de=enstrates the acceptability od the cannister deste.n.
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4 CMINISTER M;D MODULE CONFIGU.:.ATIONS_
I CA':N STER DESIGN 1
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[hTK??.0TOTY?E ITST REFORM LOW VOLTh
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SIMLJLTX; ECUS LOCA CL*R?I: T 6 VOLTACE TEST4)
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flRST H ACE F(Fl?T.?l'. ICE 5ElfTEL SPE21?ICAT M
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hich This report is applicable to the icv vol: age electric penetrations w i
the LOCA service we required to car:y a specified curren:/ voltage dur ng i
environ =ent.
his test: #4/0 "No generic design penetratica modules were selected for tThe 4/0 =odule was cc (4 conductor) and #16 (140 conductor).the #16 module was only 1 :adiated prior to aged prior to the test;In additien, only Icv vol:cge pcVer vire sizes (#8 thru 4 To: the #16 AVG values tested in the specification.
lected by
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specified curren:odule, assumed ceprating values for current and vol: age ve:e se ]
l Ceneral Electric Cc=pany.
l 2.0 RE Tr?.ENCES
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Bech:cl Specification 76Cl.-I-34 para. 12.3.2b7
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Ceneral Electric Co=pany, Table I, Oata Sheet
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3.0 T!sT RIOUI?_NE't-S_
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d t rs Si=ultaneously vi:h the bel::v listed 1,0CA envirenzenz, the 4 0 con uc o shall carry 145 a:ps 2460 Vac.
259 260 220 Te=perature *F 54 40 20
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Pressure psig 100 100 100 23 hours2.662037e-4 days <br />0.00639 hours <br />3.80291e-5 weeks <br />8.7515e-6 months <br /> RH 15 =in. 45 =is.
Dura:1cn 0120 Vac.
~he assu=ed electrical loadi g f or the #15NJG =odule is 3 amps i
4.0 TEST FARD*JA?I l
Ev e. No.-
. Serial No.--
.N a_:_e.
Y7257-312 157CiS37G001 Y7:57-259 4/0 157C45360003
- 16 5.0 TEST SIT l?_
h is : unted The :ve =edules vere installed in an actual header plate w 3
2 A Caired to self contained au:oclave.
con:aining H EO,/NaOH :o make the pH of the solutien 10..
- is used te boil the solu:1en and raise the tempera:ure 3
In addi:icn, ni::: gen gas is added to the vessel heater eleech:
Figures 1 and 2 define in the autoclave.
( 10 psig) to achieve :he specified envirenecnt.
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the elec: ical :est set up during the LOCA environ:.en.
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LC'4 */OLTAGE ELECTRIC ?INET?.CICNS l{.,,p.~1.h 941-51610-5
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SIE'i.TA;; ECUS LOCA, CCF.?Im 6 /OLTAGE TEST RETE */INCE ECitTEL SPECIT:CA!!CN 760.'.-E34 3
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RCvisto 6.0 TEST F55UL_'5, The tvo =edule.s were subjected to :he envirenzen: and ele :rical leading defined in para. 3.0.?rior to this tes:ing, :he cdules received the folleving aging.
- 4/0 66 ther:41 cy cles, 50-150-50*F, 3 to 4 cycles per day @l00% RH 5x107 Rad, ga= a exposure
- 16 No thermal aging 5x107 Rad, ga==a expcsure Af ter ce=ple:1cn of all testing, both sedules were helium leak tigh:
to less than 1x10-0 cc/sec G20 psig.
An exact value is not provided since the recorders en the heliu: = ass spec::::eter shewed no sign of change f rom the calibra:1cn of 1x10-9 cc/sec.
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~he ef fec:s of irradiatien en :he epexy inthe =edule is to increa:e the 0
f electrical insulatica resis:ance.
As :he specified value of 1x10 Rad is no: a::ained un:11 the end of ?cs: LOCA, a tes t en the ::dules which vere previously irradia:ed :o :his value veuld no: cens ci:ute realis tic condi-tices.
~he value selected (5x10/ R) increases the nardness of the apexy In addi:ien, 5x10/ R but has negligible af f ect en electri:a1 preperties.
is the exposure tha: the see:ndary seal experiencen due to prete::1cn
- l fre= :he headerpla:e. Tnis test, therefore, as cer.due:ed, af fords the 6:n' e of elec:rical breakd:vn during LXA servica
=edule with the grea:es:
environ =en:s.
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PaoTorn REST RE?cRT 1-5161'0-5 LO VOLTAGE ELECT?.~C ?E iET?ATICMS SDfULT/dEOUS LOCA..CUFJENT & VOLTACE TEST
- tIFERENCE SEC)lTEL $?ECIFICATION 7604-E34
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HILLSTCNE 2 ELECTRIC RENETRATION 941-S1610-6 POSI-LCCA PROTOTYPE TEST - FINAL REPORT
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- EoE'JCE BECHTEL SPECIFICATICN 7E04-E34 2
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n n...i n atvivan PROT 0iTPE TEST REPORT MILLSTCNE 2 ELECTRIC PENETRATION POST-LOCA PROTOTYPE TEST FINAL REPORT Prepa.ud by:
N. G. Luria Test Conductor:
B. J. Nale:inski l
781120 0 372 PRINis 7" s
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941-51610-6 POST-LOCA PROTOTYPE TEST - FINAL RE?CRT at:t:ENCE RECHTEL SPEC'~lCATICN 750'-E34 2
rinst ract res 3
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RevistoY con e : in 1.0 SUMBARY For the period frcm 3 March 1974 thru 10 March 1975, including a one week shugdewn, the icw voltage pcwer and centrol modules were subjected toUpon ccepletien 165 F, 5 psig,100% RH envircrcent.
units exhibited a leak rate of less than 1 x 10'* cc He/sec at 1 atm. 0 The high voltage, over the same period was subjected to 220 F, pressure. 100% RH envirencent and was also helium leak tignt to less than 20 psic 1 x 10'6 cc/sec 01 atm pressure.
2.0 Reference
- 1) Bechtel Specification f7604 E 34
- 2) GE Test Report - 1.cw Voltage pcwer f 941-51610-5
- 3) GE Test Report - High Voltage 174-502-1 3.0 Test Recuirement Bechtel Specificatien #7604-E-34 para 5.5(2).
" Items B, F, G (10w voltage centrol and ccwer)* shall remain electrically operable under the ccnditiens stated belew..."
4 pressure, psig 54 40 20 5
tEriperature, F
239 260 220 160 15 min 45 min 23 hrsy 1 year duratien q
Y see references 2 & 3 (It is assumed that the assembly shall remain helium leak tight te less than 1 x 10- cc/sec after ccepletien of the test.)*
- Brackets are GE clarification.
4.0 Hardware Identification l
The fo11cwing hardware was subjected to the required (or greater) l envircnment.
Name_
@icNo.
S/N_
174B9302G001 6574036 Hfsh Voltage 157 CA837GC01 Y7257-312 14/0 Module Asm 11 6 AWG Module Asm 157C4836GCC3 Y7257-259 nwsu 941-51610-6
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?.' O W PROTOTYPE TEST M.PCRT MILLSTCNE 2 ELECTRIC PE4':ETRATICN 941-51610-6 POST-LOCA PROTOTYPE TEST - FINAL REPORT REFERENCE BECHTEL SPEC:FICATICN 7504-E34 4
3 riasi nctten n o....m atvisicN.
5.0 Test setuo The above hardware was installed in the fo11cwing auteclaves, in a vertical position to simulate a worst case ccnditien.
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Penetratien l
Name Autoclave l
1.cw Voltage Peuer S/N 330 Lew Voltage Centrol S/N 330 l
High Voltage S/N 5641 Tests were cenducted at GE, San Icse, Ca. f acility, Bldg. W i
6.0 Test Results l
The tests for Lew Voltage were ccnducted frem 3/3/74 to 3/10/75,wi'.h a cne week shutdewn for a periodic test ecu1ctent maintenance.
ine,ests for High Voltage were ccnducted frcm 3/3/74 to 3/3/75.
The test units were subjected continucusly to the follcwing envircnment:
+-
Lew Voltage High Power & Centrol Volta'e temperature, CF 165 220 pressure, psig 5
20 duration 1 year 1 year
$100%
s100%
5 py During eenths 6, 7,10 & 12, the 1ew voltage units were brcugt to ambient ccnditions and the leak rates were measured at less
...an 1 x 10~8 cc He/see @ atm cressure. Af ter 1 year, h1ch voltage was measured to have a leak rate less than 1 x 10,jhe cc He/sec 0 amb cenditiens.
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ll The following electrical reasure. ents were recorded en the test units:
Date of Insulation Test Resistance Hioot Continuitv s
I t.cw Voltace Power
(!4/0) 3/12/75 0
50 VDC n No Change 1
j (S/NY7257-312)
.5 x 10 a 100 VAC 6
7 1/15/75 1 x 10 n 100 VAC 10/2/74 2.8 x 10 n 700 VAC l
5 1
5 9/3/74 3 x 10 a 2.3KVAC l
i 4
I 9
6 100 VAC No Change 3/12f75
.5 x 10 a 7
(S/NY7156-259) 1/15/75 1 x 10 n 15C VAC 10/2/74 5 x 10" n 450 VAC 5
9/3/74 1 x 10 a 500 VAC l
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