ML17261A215
| ML17261A215 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 07/21/1980 |
| From: | White L ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17250A458 | List: |
| References | |
| TASK-08-04, TASK-RR NUDOCS 8007290740 | |
| Download: ML17261A215 (83) | |
Text
ROCHESTER GAS @HO ELECTRIC COi?PORATIC'I
'x s 8r ~AS i APERCU,.OC4co(~x, M.F. t>049 LEON O. iVHITK.JR VLCC epCSIOCNT July 21, 1980 Director of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield', Chief Operating Reactors Branch N5 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
SEP Topic VIII 4 Electrical Penetration of Reactor Containment R.E.
Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Czutchfield:
This letter will serve as Rochester Gas and Electric's response to the assessment of SEP Topic VIII-4 issued by letter dated March 24, 1980 from Mr. Dennis L. Ziemann.
Specific comments are enclosed for your review.
We have reviewed the concerns set forth in the-SEP-=Technical Evaluation and believe that clarification of certain design features of the Crouse Hinds electrical penetrations will resolve them.
The following information is provided to supplement our April 12, 1979 submittal and to permit revision of the Staff Technical Evaluation.
Silver brazing is used in the two largest categories of power penetrations while soft. solder is used on all others.
However, the NRC Staff assumed a soft solder seal for all penetrations.
This greatly understates the thermal capabilities of penetrations using the high temperature braze.
The melting temperature for the silver brazing is 1100'F or 600'C.
Formula 1 obtained from the RG&E's submission (IPCEA-P-32-382) was developed to allow the user to determine the maximum time a cable may be subjected to a short circuit load without damage to the insulation.
The Qp$
formula is based on the heat content of the conductor material and the temperature limits of the insulation
'li>"
with the assumption that the time interval is so short that the heat developed during a short. circuit is con-tained in the conductor.
eaa8~
THIS DOCUMENT CONTAINS POOR QUALITY PAGES
s
'/
~l k
II
'y'
ROCHESTER GAS AHD ELECTRIC CORP.
DATE July 21, 1980 Mr. 'Dennis M. Crutchfield SHEET NO.
Consequently, this expression should not be used to determine the time it takes to reach the maximum short circuit temperature of the bushings used in Ginna penetrations since it does not take into account any heat dissipated.
The "heat sinking" will greatly increase the time to melt a seal for a given short circuit current.
A more realistic approach is to use the actual test data for each penetration to2make such a determination.
Specifically, the tested I t values can be adjusted to account for a 140'C ambient temperature using the relationship shown as Formula 1.
The I t value for the N2 AWG size penetqations, using 2
the C-H test data shown below is 7 x 10 TEST DATA:
( 64. 8 Maximum Peak Current) for 3.0 cycles.
180
+ 234 140
+
234'0297 A
.0297 A
log 180' 234'5o
+ 234o I t
( 25'C)
To adjust this value to a 140'C ambient a factor derived from formula 1 can be developed as follows for the soft solder seals:
0 0
I t (140o)
I t (25
)
Thus the I t for thy 52 type penetration at 25'C can be 2
reduced from 7 x 10 to 1. 4 x 10 to include a 140'C ambient.
The resulting allowable time2is determined to be
.15 seconds at 9.6 KA.
Using the I t values for this specific penetration yields a more realistic result.
The backup clearing time for the AE-6 penetration of.1 seconds is sufficient to comply with the staff's criteria.
2.
Therefore, all penetrations are acceptable:
the two largest power penetrations because they employ silver brazing and not soft solder and all other penetrations as analyzed above.
There are two large penetrations used to feed the reactor coolant pumps.
The Technical Evaluation postu-lates that one of the two feeds
- opens, without a fault, causing the remaining feed to overheat when subjected to full load current.
The calculated time to failure was 6.5 minutes.
ROCHESTER OPS AiVO ELECTRIC CORP.
July 21, 1980 Mr. Dennis M. Crutchfield SHEET NO.
3.
This conclusion is based on a soft solder seal and continuous current ratings of the cable.
Zn actuality, this penetration has a silver braze seal and has a
continuous current rating of 1000 amperes.
The 450 ampere rating in the RGGE report reflects the rating of the 750 mcm cable.
Should the postulated condition
- occur, remote as it might be, no seal failure would result.
There would, however, be a degradation of the cable insulation and a breaker trip would result to clear the problem once the insulation failed.
The staff's evaluation of the CE-21 penetration indicated that no data was submitted on mechanical stresses of the tested values.
The C-H testing program demonstrated both the ability'o withstand short circuit currents and the mechanical stresses associated with the high asymetrical test currents.
The test reports
( see enclosures) indicated that certain penetrations required additional bracing in order to pass.
The required bracing was installed.
4 ~
5.
The direct current penetration, CE-23, does not comply with the staff's criteria in that the backup device, at all fault current levels, does not respond fast enough to prevent a seal failure.
Both the primary and secondary protective devices are fuses.
The most likely failure mode is for the fuse to fail open.
However, all dc control circuits in all penetrations will be reviewed and additional fuse protection will be installed.
A concern has been identified in the'evaluation report which deals with low magnitude faults.
While some backup devices respond to high level faults they do not clear in sufficient time on low magnitude faults.
Low voltage penetrations, CE-21,AE6 and the medium voltage penetrations CE-25 and 27 are currently being reviewed to improve the backup breaker characteristics.
When the reviews described above are complete the Ginna electrical penetrations will meet current licensing criteria for operating plants.
That is, the as-built penetrations were designed so that the containment structure can, without exceeding the design leakage rate, accommodate the calculated pressure and temperature resulting from any loss of coolant accident.
ROCHES R GAS AHO EL CTRIC CORP.
July 21, 1980 Mr. Dennis M. Crutchfield SHEE7 NO.
4 Enclosed please find responses to the additional questions raised by a member of the NRC Staff concerning this SEP Topic.
Very truly yours,
Response
to NRC's Request for Additional Information Ref:
SEP TOPIC VIII-4, ELECTRICAL PENETRATIONS Question:
1.
Please provide responses to the following:
Response
a)
Quantify the softening point of the silver brazing used in your larger penetrations and identify the basis for this point.
The softening point of the silver brazing used in the 500 mcm and 750 mcm, Configuration Sketch "E" type penetrations is assumed to be the lowest temperature listed for silver braze as shown in attachment 1.
The lowest ASME classification of brazing filter metals range from 1145-1400'F.
For conservatism 1100'F or 600'C is used.
Question:
b)
Clarify the discrepancy between your citation of silver brazing in the subject letter and the statement made by your Mr. George Link to Mr. A. C.
Udy of EG&G Idaho to the effect that your analyses were all based on soldered seals.
Response
It should be noted that the term "silver solder" is often used to describe the material which should properly be referred to as "silver braze" in accordance with the ASME definition, so that some misunderstanding may have developed.
C-H has recently located additional drawings which detailed the high temperature braze seal and which establishes the 1000 ampere rating on the bushing.
These drawings enclosed as attachment 2.
Question:
Response
c)
Clarify the discrepancy between the statement in your letter that silver brazing is used in the largest power penetrations and the statement in your April 12, 1979 report that, "Details of each penetration can be seen on the Crouse-Hinds drawings....".
(Crouse-Hinds Drawing 0100350 Sheet 2 of 3 states that the 750 mcm penetration has a glass/metal feedthrough.)
The glass/metal feedthrough detail shown on C-H drawing 0100350 sheet 2 of 3 applies to configurations A,B,C,D and F only and not to Type E, the 750 mcm penetration.
The C-H drawings of the power penetrations show the silver braze used to seal the conductors fed through the bushings.
Question:
2.
Please provide responses to the following:
a)
Clarify the discrepancy between your reference to test data and Paragraph 2.52of your April 12, 1979 report that states that the I t values were calculated.
Response
Question:
Question:
Response
The "manufacturer's calculations" referred to in paragraph 2.5 are based on test data for penetration types A and E.
All others were based on analysis.
b) If the I t values were calculated, provide the mathe-2 matical models of the containment and penetration heat transfer that were used in the calculations.
If actual tests were run, provide a description of the test set-up, procedures, and results.
c)
Justify the use of a single test point to determine the
- shape, slope, and intercept of a line.
The ambient temperature condition during short circuit testing was assumed to be 25'C.
)he data (current and time) were used to establish an I t function which was then adjusted using formula 1.
The model assumes that all heat developed during the short circuit is contained within the conductor so that penetration geometry and heat transfer characteristics are not used.
It should be noted that IPCEA P-32-382 is based on this conservative
=-model.
Since the IPCEA standard does not contain an explicit derivation of the I t relation, we have included one in the attachments.
Since no heat is assumed to be transferred out of the conductor, the adjustment of I t values for different ambient tempera-tures is accomplished by changing the initial temperature in the IPCEA formula as described in our letter.
Certified Test Reports are included as attachment 5.
Question
Response
3.
Justify using the 450 amp cable rating for the 750 mcm penetration in your April 12, 1979 report and provide the basis for the 1000 amp rating you now wish to use.
C-H has recently located design information on the Alite bushing used on the 750 mcm penetration.
These data are enclosed as attachment 3 which show that the bushing and seal integrity are rated for 1000 ANPS.
ATTACHMENTS TO RE UEST FOR ADDITIONAL INFORMATION Ref:
SEP Topic VIII-4, Electrical Penetrations 2.
3.
5.
ASME Table QB-432 Grouping of Brazing Filler Metals Crouse-Hinds Drawings 0100332 - High Amperage Insulator For 75 mcm; 5 Kv 0100292 S/A of Insulator and Cable Seal for 750 mcm cable Data. Sheet Alite High Amperage Bushings Derivation of the IPCEA, ( I) t formula (A)
Crouse-Hinds Test Reports:
a) Certified Test Report on Electrical Penetration-3 Conductor M-573-1968 b) Short Circuit Test on 52 AWG. low voltage limit
'I h
DATA QB-130 F-NUMBERS QB f31 Get)eral All p;t <<s in this Article are identified by the number I-1-3. followed by the specific page identi-l'ying nulnbcr, which is indicated at the bottom of e<lcli pag<c.
Tlte I')lfowing F-Number grouping of brazing filler metals in QB-432 is based essentially on their usability <<hara<<teristics, which fundamentally deter-F-NUMBERS QB-430-QB-432 mine the ability of brazers and brazing operators to make satisfactory brazements with a
'given filler metal. This grouping is made to reduce the number of brazing procedure and performance qualifications where this can logically be done. The grouping does not imply that filler metals within a group may be indiscriminately substituted for a filler metal which was used in the qualification test without consider-ation of the cotnpatibility from the standpoint of metallurgical properties, design, mechanical proper-ties, and service requirements.
~) c Itg ~
g l~'J t",
QB432 F-NUMBERS Grouping of Brazittg Filler Metals for Procedure and Performance Qualification SFA-5.8 Recorrrinended Joint Clearance at Brazing Temperatures, in.
F-ASME QB No.
Classification Nominal Composition, %
Ag Cu Zn Cd Ni Li Other Brazing Range
- Temp, F
With Chemical Fluxes With Atmosphere Brazing*
432.1 F-i0 t BAg-1 BAg.la UAg.8 UAg ea 45 15 50 155 72 28 72 27.8 16 24 165 18
~
~
~
0.2 114 5-1400 1175-1400 143j-1650 1410-1600 0.001%.003 0.001%.003 0.001&.003 0.001&.003 0.000%.002 0<000%.002 0.000%.002 0.000&.002 432.2 F-t02 BAg-2 BAg-2a BAg-3 BAg.4 UAg.5 BAg 6 BA-7 BG-13 BG 13a UG-18 35 30 50 40 45 50 56 54 56 60 26 27 15.5 30 30 34 22 50 42 30 21 18 23 20 15.5 16 3
28 2
25 16 17 5
1
~
2 5Sn 10 Sn 0.025 P 1295-1550 1310-1 550 1270-1500 1435-1650 1370-1550 1425-1600 1205-1400 1575-1775 1600-1800 1325-1550 0.002&.005 0.002%.005 0.002&.005 0.002&.005 0.002%.005 0.002-0.005 0.002&.005 0.002%.005 0.002-0.005 0.002%.005 0,000%.002 0.000-0.002 0.000-0.002 0.000-0.002 0.000-0.002 0.000&.002 0.000%.002 0.000-0.002 0.000%.002 0.000-0.002 BG.19 92.5 7.3 0.2 1610-1800 0.002-0.005 0.000-0.002 432.3 F-io'CuP-1 BCuP.2 8CuP.3 BCuP.4 UCuP.5 Cu Rem.
Rem.
Rem.
Rem.
Rem.
Ag:-.
P 5
7.3 5
6 6
15 5
1450-1700 1350-1550 1300-1500 1300-1450 1300-1500 0.001-0.005 0.001-0.005 0.001-0.005 0.001&.005 0.001-0.005
<VOTES:
t 1) Fur nrax <<iu;ri strength use a press fit at room temperature, of 0.001 fir.lfn. of diameter.
i2') At r<o"uvre Lrazirrg includes brazing in vacuum, in addition to such gaseous atmospheres as hydrogen, argon, dissociated ammonia, etc.
Attachment 1
(Q8-432 continues on nexr page)
N 1
f h
~ I C '
t
/>t> y Qs Q>J>>,
r'.>>t>->
. '">>~o DILVEHHKIIZENQfg QQV5 STOCK NUMBER 1ifICOhigh purity silver brazing alloys
"{COSIL35
" rnlloyhas a wide range between melting and flow points.,
-is more sluggishly and ls used where fit-up is poor and "Intge fillets are desired.
"ICOSIL45
~ be used for such similar applications as AIRCOSIL 50.
- !~y has a lower melting point than AIRCOSILSO.
i"tCOSIL 50
- i; ncral purpose alloy suitable (or brazing assemblies of
". iiioy, tool and stainless
-vfnrcombinations of these metals.
Wire Size 1/32" 3/64" 1/16" 3/32" 1/8" 1/32" 3/64" 1/16" 3/32" 1/8" 1/32" 3/64" 1/16" 3/32" 1/8" Random Coils 925 350'I 925.3500 925-3502 925.3503 925.3504 925 4501 925 4500 925 4502 925 4503 925>>4504 925 5001 925.5000 925.5002 925 5003 925 5004 4 oz.
Package 925-3541 925.3540 925.3542 925-3543 925-3544 925 4541 9254540 925>>4542 925 4543 925 4544 925 5041 925.5040 925-5042 925 5043 925.5044 50 oz.
Package 925-3551 925 3550 925 3552 925 3553 925 3554 9254551 925.4550, 925.4552 9254553 925-4554 925.5051 925 5050 925-5052 925 5053 925-5054 i>'ITIFICATION OF AIRCOSIL SILVER BRAZING ALLOYS AWS.ASTM Solidus
~
alACO Alloys Class Silver Copper Zinc Cadmium Others a F Liquidus oF Brazing Temp.
Range aF
~~,
~ 1
> ~
tilCOSIL 50 uflCOSIL 3
'iflCOSIL45 flCOSIL 35
'u{COSIL 30 uilCOSIL S
-"ilCOSIL 15 uflCOSIL A'u{ICOSIL8
'tflCOSIL C'.flCOSiL0
"'ICOS IL E "ltCOSII. F
- ICOSIL G
'ICOSIL H';lCOSILJ
""{:OSILK
'lCOSIL L zulCOSIL M "flCOStl.
P':l{:OSILR
- .cosit. So
'n Alloys m
'!ERS{yIITHSOLOERS BAg-1 a 50 15.5 16.5 BAg 3 50 15.5 15.5 BAg-1 45 15 16 BAg 2 35 26 21 BAg 2a 30 27 23 BCuP 3 5
88.75 BCuP 5 15 80 9
53 38 20 45 35 20 45 30 30 38 32 BAg 4 40 30 28 40 36 24 BAg 5 45 30 25 BAg 6 50 34 16 8Ag.7 56 22 17 60 25 15 BAg 13 54 40 5
BAg 8 72 28 85 40 30 25 B>>g >8 60 3t>
ade on special order only.
18'6 24 18 20 Ni3 P 6.25 PS Ni 2 Sn5 Ni 1 Mn 15 Ni 5 Sn 10
'160 1170 1125 1125 1125 1190 1185 1410 1315 1140 1370 1240 1235 1250 1270 1145 1245 1325 1435 1760 1240 1115 1175 1270 1145 1295 1310 1480 1500 1565 1500 1500 1410
'l435 1415 1370 1425 1205 1325 1575 1435 1778 1560 1325 I 1 75.1400 1270.1500 1145 1400 1295.1550 1310.1550 1300 1550 1300 1500 1600 1750 1500*1700 15OO 1700 1410 1650 1435 1650 1445.1650 1370-1550 1425.1600 1205.1400 1325.1550 1575 1775 1435.1650 1 780.2100 1560 1750 1325.1550
>l
~
"'COSII Easy
"'{COSILMedium
'{COSILHard 65 20 70 20 75 22 15 10 3
1240 1275 1365 1325 1360 1450 1325 1550 1390.1600 1450 1650 nSPHORUS AND PHOS SILVER ALLOYS
>I>~
I!i()
153 154
"- n Copper.Rod
'"nt Copper Strip Silver 6 r"n<.Silver 6>VI
~ni Silver 2 BCuP.2 8 CUP-1 8CuP.4 8CuP-3 93 95 6
875 6
88 2
91 P 7 1305 P 5 1305 P 7.25 1185 P 6 1190 P 7 1190 1485 1650 1380 1480 1450 1350 1550 1450.1700 1300 1500 1300 1550 1350.1500 5.3
t I
Attachrrent 3
M ZiieH Zsws s~~es susHiWGS Alite high current, hermetically sealed bushings are quickly and easily brazed or ivelded into final as-semblies to form strong, trouble-free, gasketless bonds capable of ivithstanding very high temper-atures.
Their mechanical strength characteristics and thermal shock properties far exceed those of glass or porcelain. Impact-and corrosion-resistant, Alite high amperage bushings retain their superior dielectric properties at elevated temperatures.
Their lustrous smooth, hard, easy-to-clean glaze assures hiLh surface resistivity.
13/I6'-II/I6'LAZED 2.000'e Metal Parts: Kovar
'r'.a~4PVg
'Res. T.MWestlngtsause Electric Corporation Part Na.
HC-100 HC-125 HC-150 HC-175 HC-225 2.750 3.250 3.500 4.000 4.500 1
1 I/e 1 I/s 1 s/4 2 I/e
.906 1.156 1.406 1.719 2.156 lee 1%
2 2IA 3
Current Carrying Capacity (Asnps) 500 1000 1500 2000 3000 Jj
~ha r, M~m-sr nr w r~8,. 'E ~/~'oi~wE '
!csa'ster, 4a~eine.
s~ hJ~'rs=:
~ "rr c.
" ',~'~~~'~'~"-'0'eYj'e"
>M% /8/ lee'~v "i~
~~~of rc
~"
Special purpose units shown:
- 1. Hermetic transformer housing.
- 2. High current hushing designed for heavy center conductor.
- 3. and 4.
Special high voltage custom designs.
lw s
it
~
C'
~
~
ac ~el' Ualiia n c li ALI]TE iia t vn i ~ alla HIGH TENPERATURE HERNETIC BONDING PROCFSS Our method of high temperature metal-lizing and brazing provides a ceramic-to;,
metal seal that is strong, permanent and vacuum-tight.
In this process, a special refractory metallizing compound is applied to the ceramic over areas where metal components are to be bonded. Subsequent high temperature firing in a controlled at-mosphere produces a smooth integrally-bonded metallic surface to which the met-al parts are then brazed with fine silver or other high temperature braze metals. Due to the inherent high temperature stability of the ceramic and the bond, operating temperatures of Alite terminals are re-stricted only by the tern'perature and oxi-dation limits of the braze material and metal parts.
NETAL PAR7S bletal flanges and terminal caps are formed of low expansion type nickel-iron ivith fused-on silver plating.
On special order other types of plating or other metals such as nicl'el. iXIonel. copper, or stainless steel can be supplied to meet,diEerent cn-vironrnental conditions.
Terminal studs made of nickel plated low carbon steel or unplated type "R-i~'lonel are included as standard equipment. Studs made of other materials in various finishes, lengths and thread sizes are available on special order.
Terminals can also be supplied without studs. or with center conductors.
FINAL ASSEA1BLY AlETHODS The sturdy construction of Alite terminals permits a wide range of installation tech-niques. For service at extreme high tem-peratures they are usually brazed to main assemblies by torch, induction or furnace brazing.
WVelding the terminals to equip-ment is also possible by resistance or inert arc welding techniques.
Low temperature soft soldering is a
suitable method of
Attachment 4
DZEXVATTQNof the
- IPCEA, I
t Formula.
A Assume all ohmic heat is retained within the conductor during the short circuit.
(i.e. adiabatic heating)
Q =
R =
L =
A
~(T)
=
Cp
=
To heating rate conductor resistance conductor length conductor cross sectional area conductor resistivity conductor specific heat capacity Effective absolute zero for conductor material (Celcious scale)
Conductor heating rate per unit length, Q/L = I R L
R = ~L(~T A
Q/L = I ~T A
Rate of change of temperature.
dT I
~T A
Cp
~(T) = r(Tc To)
~
~
dTdt let Tc - To =
I I 2 A
(Tc To}
r Cp i()'l 0
dt r
Cp I
<t
~C l
Tcl - To
\\
Attachment 5
CERTl Fl ED TEST REPOPT
'N ELECTR1CAL PENETRAT1ON - g CONDUCTORS REPORT
~1-575
~
~
r 4
~ 6 CROUSr - H1NDS CO,'.\\P ANY BY KEARNEY. CO/.'IPANY LECTRl CAL RESeARCH LABMATORY DcCOO'ij',
1LLlNOl S 1 9o8
~ e Al"575 Page I
Kearney Company Electrical Research Laboratory
- NcCook, I I I inois I,
Sample Description 2D Efectrlcaf penetration - $ conductor, consisting of stainless-steel
- canister, 8" pipe, 5 feet long, viith 2 headers v)1th g ceramic insulators in each, Three conductors vtere trained and braced internally v~1th fiber discs.
'. Conductors under test 750 fhC'('nused conductor 500 tACN I
'I Sample identif iod as a mock-uo unit with Ion voltago ceramics9 Cat.
No. 010025l, order No.
F<<S'IL(77-CD Ob 'ecf of Test Inves t i gate short-c ircuit current cap ah i I Test Program, conducted on August 28, f968.
A, Shot /,'I, (f8,700:A asym.
RNS for 82. c (For current calibration se
.Sym.
RfAS )
After the shot~
tes t s amp f e leads-of-the bridge circuit A
It les of tho des igno yc l es, osc.
1/7 e osc.
f/6-60,000 A
'es
- istance, including was measured at 27 mM.
,BD 5 KV DC voltage vras appf ied to measure leakage current - negligible (pA range)'o No gas leak detected at 65 psi by "SNOOP" No visible damage to ceranics or bracing discs, Shot b2o,6$,000 A asym..RIES fo; 7 cyc l es, osc.
(88 (Use calibration osc.
1/6).
After rhe snot, resistance and leakage current nere about the same.
Higher gas
! eak detected on..unviedged.ceramicso
~
No f eak on vjedged ceramics.
No visiblo damage to ccrqmIcs or bracing discso (Cont I nuod P ag e 2, )
/
~
~
I e
~ v
~ ~
I
~~"575 Page 2i C.
~Shot t","
9 ~ ~Shot r~r' Eo Shot
-,rgb F,
. Shot.
~6o G,,~Sho t L~.,
Test Circuit Kearney Company I'tcCook, Illinois (Continued
-')
This was a one-half cycle fesi shof fo merely reduce possibility of an inrush current to fho test transformertoccurrlng on the HV side or tes t l'ransformer during lhe folloviing tosio S
s ee o c l10.
7l,)F00 A asym.
R/PS for 9 cycles, osc. Iltl
. (For currenf calibration see osc ly9-
-80,000 A sym.
Rlt'.S)
After the shot, resistance and leakage curront were ab'out the
- same,
'No additional gas leako No vis lb le damage to coramics or bra'c ing discs.
No test:
see explana; ion unde." shot ji-'$
See oscollt2.
t
. 79~200 A asym,
'R/hS for fOy cyc l os,
- osc, iLg
{Use caf ibration osc. ij9).
~After ihe shot, resistance and leakage current were abou ihe same>
No g as l eak.
No visible damage to ceramics or bracing discs,'
80, lQO.A asym.
RBS for lO cycles,
- osc, JQ.,
(Uso calibration osc, lg9).
After the shot, resistance and leakage. current vjere about i he same, No gas feako No vis lb le danago to
- b. ac ing discs The rest sampl o was. energized through a l2,000 KYA 9KY special monenf ary trans former, connoc ted for y60V on the.secondary
{tes',) side.
Cl osing in for maximum asynnetry was accompl ished by spark ing over an air gap v(ith a
l2~~KV surge generator synchronized to f ire at Oo of the 60-H supp l y vol tage.
Des irab i o short durat ion t iming was approximarod by us ing an appropr iate back-up protect ion fuse cuf'out, Currents a current KVA es, in cycles through fhe t, sf specimen viere measured by means of f rans rormer on f he high>>vo l tag e s i de of the l2,000'ransform"r.
Durat ions or'urront fl ov~ vJero counted from aciual oscil lograms,.
t
.(Continuod P'ago'go) t 1
'1 t
t
~4
~ ~
~ ~
>'575'ago ~,
Kearney Co.".,pany h'cCook, t f l inois
-(Continued -
)
)
)
Al f measured'ts ivere made in accordance v(ith the appf lcab le standard speci fications.
Common sound engineer ing practices vIero fof lovred in measurements nor specifical ly standardized.
Asymmetr ical Rh(S currenis v.ere determined in accordance nf th fhe apoendix of, AiEE Standard for Air SvIitches, lnsul ator Uni is and Bus Supports",
Pub f.
No 22, dated
- lharcn, f960; see curve h( of Fig. 5.
Cert i f icat ion
)
Stai ements made and dafa shovin in'his report.h<<<5g, con-s ist ing of $ pages, are to the best or'y knowledge and bof I correct vI f thin, i he usual f imi ts or commerc l af tes t ing pract i Tost v,'as vlf tnessod by '.(r. Jim Kef fy, Eng incer, Nuclear
~
Penetration Eagfneorfng, or'rouso-H~inds
- Company, t
'ost conductod by:
)
)
i
~ '
)
ef~
CGo Josoph Sudz ius Tos t Eng incor Approved by:
) ~
)
~ l.
) ~
Alo".Vit!<us Chiof Engineer
)
. ~
~ r AY: r,.".
~
~
)
~ )
~,
9-f7-6S h'icCook, l l l inois
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NRP PEIir TRATICCf SHORT CIRCUIT TEST ON 42 Ab'G LCM VOLTAGE UNIT DEVICE TESTED A Crouse-Hinds Company low voltage electrical penetration
- assembly, Sample No. 2, per Catalog No. 0100253-1, having thr'ee (3) pairs of cables identified as Pairs ItAll IIBll d ItCll PROCEDURE The Crouse-Hinds test sample was installed in the High Current Laboratory and each pair of cables were connected, in turn, to the A and B phases of a 4375 kVA generator and subjected to a total of seven (7) single phase short circuit tests at individual curren magnitudes, ranging from 8.56 total kA (T ial 41) to 37.4 tota1 kA (Trial j7) measured at maximum crest of first period.
Each of the three pairs consisted of adjacent cables in 'the penetration
- assembly, and each pair was short circuited by a short length of cable at far end of sample.
There was no external bra,cing or mechanical support of the free ends of cables for Trials No. 1 through No. 6.
~ Prior to Trial No. 7 (last test), the free ends of 'C" cable pair were taped together with glass tape (at both lire and short circuit ends),
The test current was initiated by a synchronously controlled making switch and interrupted by the generator back-up breaker.
Duration of current flow ranged from 2 to 4 cycle s.
Measurements of insulation resistance, conductor resistance and gas leakage de-tection were made on each cable pair before test, after Trials No.
3 and No. 7.
The insulation resistance was measured with a 500 volt meggar set.
The conductor resistance was measured with a Kelvin Bridge.
The gas leakage detection checks were made at 65 PSI of air with a bubble solution known as "Snoop".
Temperature measurements were made midway of shorting cable with a therocouple and bridge, after Trials No.
5 and No. 7.
A Siemens Magnetic Oscil1omat was used to monitor t¹ current flow and time for all trials.
RESULTS 1.
Three external splices or joints fs.iled when cable pair "A" was subjected to approximately 37.0 total 1A, Trial No. 6.
2.
Cable pair "C", having the additional strength, contributed by the glass tape wrapping, withstood 37.4 total kA.
3.
Refer to Tabulations of Data for complete listing of current measurements, insulation resistance, conductor resistance and observations.
Francis J. Ke13y Richard Greene Crcuse-Hinds Company
SHE'ET L of Tf <l
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05000244 RECIPIENT IO CODE/NAME ACTION:
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//ZSF/8 ROCHESTER GAS AND ELECTRIC CORPORATION i
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89 EAST AVENUE, ROCHESTER, N.Y. l4649 LEON D. WHITE. JR.
VICE PRESIDENT TELEPIIONE AREA CODE lid 546.2700 July 21, 1980 Director of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch 55 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
SEP Topic VIII 4 Electrical Penetration of Reactor Containment R.E.
Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Crutchfield:
This letter will serve as Rochester Gas and Electric's response to the assessment of SEP Topic VIII-4 issued by letter
, dated March 24, 1980 from Mr. Dennis L. Ziemann.
Specific comments are enclosed for your review.
We have reviewed the concerns set forth in the SEP Technical Evaluation and believe that clarification of certain design features of the Crouse Hinds electrical penetrations will resolve them.
The following information is provided to supplement our April 12, 1979 submittal and to permit revision of the Staff Technical Evaluation.
Silver brazing is used in the two largest categories of power penetrations while soft solder is used on all others.
However, the NRC Staff assumed a soft. solder seal for all-penetrations.
This greatly understates the thermal capabilities of penetrations using the high temperature braze.
The melting temperature for the silver brazing is 1100'F or 600'C.
Formula 1 obtained from the RG&E's submission (IPCEA-P-32-382) was developed to allow the user to determine the maximum time a cable may be subjected to a short circuit load without damage to the insulation.
The formula is based on the heat content of the conductor material and the temperature limits of the insulation with the assumption that the time interval is so short that the heat developed during a short circuit is con-tained in the conductor.
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ROCHESTER GAS AND ELECTRIC CORP.
DATE July 21, 1980 Mr. Dennis M. Crutchfield SHEET NO.
Consequently, this expression should not be used to determine the time it takes to reach the maximum short circuit temperature of the bushings used in Ginna penetrations since it does not take into account any heat dissipated.
The "heat sinking" will greatly increase the time to melt a seal for a given short circuit current.
A more realistic approach is to use the actual test data for each penetration to2make such a determination.
Specifically, the tested I t values can be adjusted to account for a 140'C ambient temperature using the relationship shown as Formula 1.
The I t value for the N2 AWG size penetyations, using 2
the C-H'test data shown below is 7 x 10 TEST DATA:
37."4 KA total RMS (64.8 Maximum Peak Current) for 3.0 cycles.
To adjust this value. to a 140'C ambient a factor derived from formula 1 can be developed as follows for the soft solder seals:
0 0
180
+ 234 140
+ 234 I t (25'C)
.0297 A
log 180' 234' 2
25o
+ 234o I t (140o)
I t (250)
Thus the I t for thy N2 type penetration at 25'C can be 2
reduced from 7 x 10 to 1.4 x 10 to include a 140'C ambient.
The resulting allowable time2is determined to be
.15 seconds at 9.6 KA.
Using the I t values for this specific penetration yields a more realistic result.
The backup clearing time for the AE-6 penetration of.1 seconds is sufficient to comply with the staff's criteria.
Therefore, all penetrations are acceptable:
the two largest power penetrations because they employ silver brazing and not soft solder and all other penetrations as analyzed above.
2.
There are two large penetrations used to feed the reactor coolant pumps.
The Technical Evaluation postu-lates that, one of the two feeds
- opens, without a fault, causing the remaining feed to overheat when subjected to full load current.
The calculated time to failure was 6.5 minutes.
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July 21, 1980 Mr. Dennis M. Crutchfield SHEET NO.
This conclusion is based on a soft solder seal and continuous current ratings of the cable.
In actuality, this penetration has a silver braze seal and has a
continuous current rating of 1000 amperes.
The 450 ampere rating in the RG&E report reflects the rating of the 750 mcm cable.
Should the postulated condition
- occur, remote as it might be, no seal failure would result.
There would, however, be a degradation of the cable insulation and a breaker trip would result to clear the problem once the insulation failed.
3.
The staff's evaluation of the CE-21 penetration indicated that no data was submitted on mechanical stresses of the tested values.
The C-H testing program demonstrated both the ability'to withstand short circuit currents and the mechanical stresses associated with the high asymetrical test currents.
The test. reports
( see enclosures) indicated that certain penetrations required additional bracing in order to pass.
The required bracing was installed.
4.
The direct current penetration, CE-23, does not comply with the staff's criteria in that the backup device, at all fault current levels, does not respond fast. enough to prevent a seal failure.
Both the primary and secondary protective devices are fuses.
The most likely failure mode is for the fuse to fail open.
However, all dc control circuits in all penetrations will be reviewed and additional fuse protection will be installed.
5.
A concern has been identified in the evaluation report which deals with low magnitude faults.
While some backup devices respond to high level faults they do not clear in sufficient time on low magnitude faults.
Low voltage penetrations, CE-21,AE6 and the medium voltage penetrations CE-25 and 27 are currently being reviewed to improve the backup breaker characteristics.
When the reviews described above are complete the Ginna electrical penetrations will meet current licensing criteria for operating plants.
That is, the as-built penetrations were designed so that the containment structure can, without exceeding the design leakage rate, accommodate the calculated pressure and temperature resulting from any loss of coolant accident.
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ROCHESTER GAS AND ELECTRIC CORP.
July 21, 1980 Mr. Dennis M. Crutchfield SHEET NO.
Enclosed please find, responses to the additional questions raised by a member of the NRC Staff concerning this SEP Topic.
Very truly yours,
0 II
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Response
to NRC's Reguest for Additional Information Ref':
SEP TOPIC VIII-4, ELECTRICAL PENETRATIONS Question:
1.
Please provide responses to the following:
a)
Quantify the softening point of the silver brazing used in your larger penetrations and identify the basis for this point.
Response
The softening point of the silver brazing used in the 500 mcm and 750 mcm, Configuration Sketch "E" type penetrations is assumed to be the lowest temperature listed for silver braze as shown in attachment.
1.
The lowest ASME classification of brazing filter metals range from 1145-1400'F.
For conservatism 1100 F or 600'C is used.
Question:
b)
Clarify the discrepancy between your citation of silver brazing in the subject letter and the statement made by your Mr. George Link to Mr. A. C. Udy of EG&G Idaho 'to the effect that your analyses were all based on soldered seals.
Response
It should be noted that the term "silver solder" is often used to describe the material which should properly be referred to as "silver braze" in accordance with the ASME definition, so that some misunderstanding may have developed.
C-H has recently located additional drawings which detailed the high temperature braze seal'nd which establishes the 1000 ampere rating on the bushing.
These drawings enclosed as attachment 2.
Question:
Response
c)
Clarify the discrepancy between the statement in your letter that silver brazing is used in the largest power penetrations and the statement in your April 12, 1979 report that, "Details of each penetration can be seen on the Crouse-Hinds drawings....".
(Crouse-Hinds Drawing 0100350 Sheet 2 of 3 states that the 750 mcm penetration has a glass/metal feedthrough.)
The glass/metal feedthrough detail shown on C-H drawing 0100350 sheet 2 of 3 applies to configurations A,B,C,D and F only and not to Type E, the 750 mcm penetration.
The C-H drawings of the power, penetrations show the silver braze used to seal the conductors fed through the bushings.
f
Question:
2.
Please provide responses to the following:
a)
Clarify the discrepancy between your reference to test data and Paragraph 2.52of your April 12, 1979 report that states that the I t values were calculated.
Response
Question:
Question:
Response
The "manufacturer's calculations" referred to in paragraph 2.5 are based on test, data for penetration types A and E.
All others were based on analysis.
b) If the I t values were calculated, provide the mathe-2 matical models of the containment and penetration heat transfer that were used in the calculations.
If actual tests were run, provide a description of the test set-up, procedures, and results.
c)
Justify the use of a single test point to determine the
- shape, slope, and intercept of a line.
The ambient temperature condition during short circuit testing was assumed to be 25'C.
(he data (current and time) were used to establish an I t function which was then adjusted using formula 1.
The model assumes that all heat developed during the short circuit is contained within the conductor so that penetration geometry and heat transfer characteristics are not used.
It should be noted that, IPCEA P-32-382 is based on this conservative model.
Since the IPCEA standard does not, contain an explicit derivation of the I t relation, we have included one in the attachments.
Since no heat is assumed to be transferred out of the conductor, the adjustment of I t values for different ambient. tempera-tures is accomplished by changing the initial temperature in the IPCEA formula as described in our letter.
Certified Test Reports are included as attachment 5.
Question
Response
3.
Justify using the 450 amp cable rating for the 750 mcm penetration in your April 12, 1979 report and provide the basis for the 1000 amp rating you now wish to use.
C-H has recently located design information on the Alite bushing used on the 750 mcm penetration.
These data are enclosed as attachment 3 which show that the bushing and seal integrity are 'rated for 1000 AMPS.
ATTACHMENTS, TO RE VEST FOR ADDITIONAL INFORMATION I
Ref:
SEP Topic VIII-4, Electrical Penetrations 2.
3.
5.
ASME Table QB-432 Grouping of Brazing Filler Metals Crouse-Hinds Drawings-0100332 High Amperage Insulator For 75 mcm; 5 Kv 0100292 S/A of Insulator and Cable Seal for 750 mcm cable Data Sheet.
Alite High Amperage Bushings Derivation of the IPCEA, / I) t formula (A)
Crouse-Hinds Test Reports:
a) Certified Test Report on Electrical Penetration 3 Conductor M-573-1968 b) Short Circuit Test on 52 AWG. low voltage limit
I,
DATA QB430 F-NUMBERS QB-431 Gcncrttl All p:i es in this Article are identified by the number I 1-3, followed by the specific page identi-l'ying nuinhcr, which is indicated at the bottom of etlcli I):180.
Tlic lollowing F-Number grouping ofbrazing filler metals iii QB-132 is based essentially on their usability characteristics, which fundamentally deter-F-NUMBERS QB-430-QB-432 mine the ability of brazers and brazing operators to make. satisfactory brazements with a given filler metal. This grouping is made to reduce the number of brazing procedure and'performance qualifications where this can logically be done. The grouping does not imply that filler metals within a group may be indiscriminately substituted for a filler metal which was used in the qualification test without consider-ation of thc coinpatibility from the standpoint of metallurgical properties, design, mechanical proper-ties, and service requirements.
r) S>mfa QB-432 F-NUMBERS Grouping of Brazing Filler Metals for Procedure and Performance Qualification SFA-5.0 Recon<>>tended Joint Clearance at Brazing Temperatures, In.
F-ASME QB No.
Classification Nominal Composition, %
Ag Cu Zn Cd Ni Li Other Brazing Range
- Temp, F
With Chemical Fluxes With Atmosphere Brazing'32.1 F.1 01 BAg-1 GAg.la GAg.8 GAg Ga 432.2 F-1 02 GAg-2 GAg-2a GAg-3 OAg.4 OAg.5 GAg 6 BA-7 OG-13 BG.13a OG-18 45 ro 72 72 35 30 50 40 45 50 56 54 56 60 15 16 15.5 1 6.5 28
~
27.8, 26 21 27 23 15.5 15.5 30 28 30 25 34 16 22 17 50 5
42 30 24 18 18 20 16 3
2 1
2 0.2 5Sn 10 Sn 0.025 P 1145-1400 1175-1400 1435-1650 1410-1600 1295-1550 1310-1550 1270-1500 1435-1650 1370-1550 1425-1600 1205-1400 1575-1775 ieoo-18oo 1325-1550 0.001&.003 0.001&.003 0.001-0.003 0.001&.003 0.002&.005 0.002&.005 0.002-0.005 0.002-0.005 0.002-0.005 0.002-0.005 0.002-0.005 0.002%.005 0.002-0.005 0.002-0.005 0.000-0.002 0.000-0.002 0.000%.002 0.000-0.002 0.000%.002 0.000&.002 0.000-0.002 0.000%.002 0.000%.002 0.000-0.002 0.000-0.002 0.000-0.002 0.000-0.002 0.000-0.002 OG-19 92.5 7.3 0.2 1610-1800 0.002-0.005 0.000%.002 432.3 F-103 GCuP-1 BCuP-2 OCuP.3 BCuP.4 OCuP-5 Cu Rem.
Rem.
Rem.
Rem.
Rem.
Ag P
5'.3 5
e 6
7 15 5
1450-1700 1350-1550 1300-1500 1300-1450 1300-1500 0.001&.005 0.001M.005 0.001%.005 0.00M).005 0.001M.005 NOTES:
t1) For n<ax<h>>u:>> strength use a press fit at room temperature, of 0.001 in./in. of diameter.
(2) Au<<osphere I.'razing includes brazing in vacuum, in addition to such gaseous atmospheres as hydrogen, argon, dissociated ammonia, etc.
Attachment 1
(QO 432 contin<<cs on next page)
l
~ A SILVER
/j ) )" C~
LVx-)J
~ I'< )-'4 0 BBAZItNGM,E.OVS STOCK NUMBER
":ICOSIL35 (alloy has a wide range between melting and flow points.
~s more sluggishly and is used where fit-up is poor and "la(ge fillets are desired.
Wire Size 1/32" 3/64" 1/16" 3/32" 1/8" Random 4 oz.
Coils Package 925-3501 925.3541 925.3500 925.3540 925.3502 925-3542 925-3503 925 3543 925.3504 925-3544 50 oz.
Package 925.3551 925.3550 925-3552 925 3553 925.3554
<':ICOSIL 45
- nbe used for such similar applications as AIRCOSIL So.
- ".oy has a lower melting point than AIRCOSIL50.
I'BCOSIL 50
- >,vncral purpose alloy suitable for brazing assemblies of
!. alloy, tool and stainless
- ))Inrcombinations of these metals.
1/32" 3/64" 1/16" 3/32" 1/8" 1/32" 3/64" 1/16" 3/32" 1/8" 925.4501 925.4500 925.4502 925-4503 925.4504 925.5001 925.5000 925.5002 925.5003 925 5004 925-4541 gzs.nsno
'25-4542 925.4543 925.4544 925.5041 925 5040 925.5042 925.5043 gzs.sonn 925.4551 925.4550 925 4552 9254553 925 4554 925-5051 925 5050 925 5052 925.5053 925 5054
'-'.)tITIFICATIONOF AIRCOSIL SILVER BRAZING ALLOYS AWS-ASTM Solidus
>1IBCO Alloys Class Silver Copper Zinc Cadmium Others F
Liquidus oF Brazing Temp.
Range oF
( ~\\ I I ~ ~
I)))
~ (
()lt~)
()i~
<)i.)
(I(,
~
.)
I ~"
- .'BCOSIL 50
')itCOSIL 3
'tBCOSIL 45
'(IICOSIL35
',tilCOSIL 30
- tACOSIL 5
- tACOSIL 15
'tACOSIL A')ACOSIL8
'.tBCOSIL C'.(IICOSIL0
- )BCOSIL E
'titCOSIL F uitCOSIL G
",ACOS)L H'IftCOSILJ ACOSIL K
.)ACOSiL L
- )BCOSIL M
')ACOSIL P'iCOSILR
- 'tCOSIL 60 anni Alloys BAg 1a 50 8Ag.3 50 BAg.1 45 BAg 2 BAg.2a 30 8CuP-3 BCuP.5 16 9
20 20 30 BAg.4 40 40 BAg 5 45 BAg.6 50 BAg.7 56 60 BAg 13 54 BAg-8'2 85 40 made on special order only.
15.5 16.5 15.5 1 5.5 15 16 26 21 27 23 88.75 80 53 38 45 35 45'0 38 32 30 28 36 24 30 25 34 16 22 17 25 15 40 5
28 30 25 3
VEBSMITH SOLDERS "WICOSII. Easy
")ICOSIL Medium
-'ICOSIL Hard 65 20 15 70 20
'lo 75 22 3
'MPHORUS AND PHOS-SILVER ALLOYS 18'6 24 18 20 Ni3 P 6.25 P5 Ni 2 Sn5 Ni1 Mn 15 Ni5 Sn 10 1160 1170 1125 1125 1125-1190 1185 1410 1315 1140 1370 1240 1235 1250 1270 1145 1246 1325 1435 1760 1240 1115 1240 1275 1365 1175 1270 1145 1295 1310 1480 1500 1565 1 500 1500 1410 1435 1415 1370 1425 1205 1325 1575 1435 1778 1560 1325 1325
'l360 1450 1175.1400 1270 1500 1145-1400 1295-1550 1310.1550 1300-1550 1300 1500 1600 1750 1500.1700 1500 1700 1410 1650 1435.1650 1445-1650 1370.1550 1425.1600 1 205.1400 1325 1550 1575 1775 1435-1650 1780 2100 1560-1750 1325.1550 1325.1550 1390-1600 1450 1650 (ltn I ')0 152 l53 ISn
'nt Copper.Rod
"",ot Copper Strip
<<nt Silver 2 BCuP-2 BCuP-1 BCuP 4 BCuP-3 6
6 2
93
.95 87.5 88 9'I P7 Ps P 7.25 P6 P7 1305 1305 1185 1190 1190 1485 1650 1380
- 1480, 1450 1350 1550 1450 1700 1300 1500 1300 1550 1350-1500 5.3
Pt Attachment 3
MPIH ANjPSBASS 8USHlNGS Alite high current, hermetically sealed bushings are quickly and easily brazed or ivelded into final as-semblies to form strong, trouble-free, gasketless bonds capable of ivithstanding very high temper-atures.
Their mechanical strength characteristics and thermal shock properties far exceed those of glass or porcelain, Impact-and corrosion-resistant, Alite high amperage bushings retain their superior dielectric properties at elevated temperatures.
Their lustrous smooth, hard, easy-to-clean glaze assures hieh surface resistivity.
I3/I6'-
II/I6'I.AZED 4 6/I6 2.000" Metal parts: Kovara
-P Pic
"'3p
- 4. r e
jgpr vQ P Reg. T.MWestinghouse Electric Corporation Part No.
MC-100 HC-125 HC-150 HC-175 HC-225 2.750 3.250 3.500 4.000 4.500 1
1'/4 1 I/s 1%
2 '/4
<<906 1
~ 156 1.406 1.719 2.156 1%
1%
2 2t/2 3
Current-Carrying Capacity (Amps) 500 1000 1500 2000 3000 eA'
/. A
" p. i p I<<. 1
'A?i~+ <<c
'ppcI.
4iaa784%%ik'~s..<<e,p/tt)vA,
'1
>+I'M ra 2+vi --AA<"+:. '+r,~+; i~',Ag" p',Ipp
~ <<+<p.0t/
p'c spadix+
p~+A~'p~
~
~'P Special purpose units shown:
- 1. Hermetic transformer housing
- 2. High current bushing designed for hcavy center conductor.
and 4.
Special high voltage custom designs.
PE I
I 'P P*
I P
I
-. q P'
P P I
PP
-i1 I
'P ~
P PP "I
P P
P P
P P P p P
.'~<C<<I p~<<IPt<<(PP Ph P
V PPIP S
t'
HIGH TENPERATURE HERNETIC BONDING PROCESS Our method of high temperature metal-lizing and brazing provides a ceramic-to-metal seal that is strong, permanent and vacuum-tight.
In this process, a special refractory metallizing compound is applied to the ceramic over areas ivhere metal components are to be bonded. Subsequent high temperature firing in a controlled at-niosphere produces a smooth integrally-bonded metallic surface to which the met-al parts are then brazed with fine silver or other high temperature braze metals. Due to the inherent high temperature stability of the ceramic and the bond, operating temperatures of Alite terminals are re-stricted only by the tern'perature and oxi-dation limits of the braze material and metal parts.
NETAL PARTS bietal flanges and terminal caps are formed of low expansion type nickel-iron with fused-on silver plating.
On special order other types of plating or other metals such as nicl'el, iblonel, copper, or st'ainless steel can be supplied to meet dilferent en-viron>>iental conditions.
Terminal studs made of nickel plated low carbon steel or unplated type "R" illonel are included as standard equipment. Studs made of other materials in various finishes, lengths and thread sizes are available on special order; Terminals can also be supplied without studs, or with center conductors.
FINAL ASSENBLY NETHODS The sturdy construction of Alite terminals permits a wide range of installation tech-niques. For service at extreme high tem-peratures they are usually brazed to main assemblies by torch, induction or furnace brazing. Welding the terminals to equip-ment is also possible by resistance or inert arc welding techniques.
Low temperature soft soldering is a
suitable method of
\\
4 r
l
Attachment 4
.:DZBIVATXQN:ofthe
- IPCEA, I
t Formula.
2 A
Assume all ohmic heat is retained within the conductor during the short circuit.
(i.e. adiabatic heating)
Q R
L A
~(T)
Cp To heating rate conductor resistance conductor length conductor cross sectional area conductor resistivity conductor specific heat, capacity Effective absolute zero for conductor material (Celcious scale)
Conductor heating rate per unit length, Q/L = I R L
R = ~L(~T A
Q/L= I ~T A
Rate of change of temperature.
dT I
~T A
Cp
~(T) = r(Tc To) dT I
r (Tc To) dt A
Cp let Tc To =
I 2
~
( (~)2 Jl 0
dt r
Cp
I
CER71FlED TEST REPOP7
'N ELECTRl CAL PENETRATI ON>> g CONDUCTORS REPORT
~1-575 CROUSc. -
H I NDS CO",tPANY BY KEARNEY COi-',(PAN ELEC7RlCAL RESEARCH LABO'RATORY
- DcCOOA, 1LLlNOlS 1 9o8
~ 1 I
~ e e
Kearney Comipany Electrical Research Laboratory
)hcCook, l l l inois Sama I e Des cr i o t i on
'. Conductors under test Unused conductor 750 I'ICOS 500 A(CN
\\
Sample identified as a mock-uo unit with lov< voltage ceramics, Cat.
No.
Ol 0025 l ~ order No. F<<8/$ 77-C.
2o Ob ect of Tes, Electrical penetration - $ conduci or, consisting of stain! ess-steel
- canister, 8" pipe, 5 feet long~ with 2 headers niih g ceramic insul arors in eacho Three conductors vlere trained and braced internally with fiber discs.
invest i gate short>>c ircui t current capab i l it les of tho des i gn,
.~tP, 1
~
4
'8, i 968.
A, Shot
/III, (t),700:A asym.
RNS f or 8~ cyc I es, osc.
I/7 (For current calibration see osc.
!$6-60,000 A
.Sym, RBS)
After the shot, test sample resistance, including leads of ihe bridge circuit, was measured at 27 mM..
KV DC vol tage was appl ied to measure leakage current
<< negligible (pA range)'o No gas leak deiected at 65 psi by "SNOOP" No visible damage to ceramics or bracing discso S..
Shot /E2,,6?j,000 A asyn.RI!S
.fo; 7 cyc I es, osc.
!58 (Usa cal ibration osc. I/6),
After the shot, resistance and leakage curreni nere about the samie.
, Highor gas.! eak detected.
on,u.nwedge'd.;.cer.amies No leak on wedged ceramics.
No visibl o damage to corqmlcs or bracing discs
't
~
1 (Cont inuod Page 2o)
~ !"
~
~
1
~ ~
~
~
i~
>~"575 Pago 2o EE Kearney Company Ii'cCook, illinois E
I C,
~Shot fr'" 'Cont Inca d -')
This was' one-hal f cyclo test shot fo morel y
- reduce possibility of an inrush current to the test transformer.occurring on the HV side of fes t trans former dur ing the.fol 1 ovilng fes t, See
- osc, fLIO.E 0, ~Shot EI, 7l E)IOO A asyn.
RIIS'or 9 cycles, osc.
Ilail (For current cal ibration see osc 1$9-
-80,000 A sym.
RAS)
After the shof, resistance and.leakage curront were ab'ou?
the
- same,
'No additional gas leako No vis lb 1 e damage fo ceramics or bra'c ing discs.
E.
Shot 8~5.
No tesf:
see exp l anat lan unde," shot gj$ o See os R,
. Shot:
sE 6.
79,200 A asyrs,
'Rl'IS for IOh cycl osE
- osc, ILI9 (Usa ca! !brat Ion osc,
!99I.
After fhe shot, res is?ance and 1 ca<age current vier e ahou the saneo No gas leak.
No visible damage fo ceramics or bracing discs, II G,
~Shot /
HOI IOO,A asym.
RIIS froIO cyclos, osc, Ilp (Use cai ibrai ion osco lg9).
A f I er the shot, res is?ance and 1 eakage current
~ v(ere about the samoo No gas 3 eako No visible damage to brac ing d;scs.
Test Circuit The rest sampl o vias. energized through a
12,000 KVA 9KV special momentary frans former, connected for $ 60V on the.secondary
{fes f ) side.
Closing in for maximum asymnetry vias accompl ished by sparking over an air gap viil'h a f25KV surge gene!-ator synchronized to f ire at 0
of the 60-Hz supp l y vol tage.
Desirablo short dura? ion timing was approximafod by using an appropriate back-up protect ion fuse cutout, Curreni s f hrough f he tos t spec imen were measured by means o f a current transrormer on the high>>vol fage s'lde of fhe 12,000'YA test transformer.
Durations or" current f1ovi vlere coun? od ln cycles from acfua] oscil lograms,.
~
.(Continued Pago'o )
I
~ E s
\\
~ ~
Koarncy Company J".cCook~
l l l inois
. ~
>h-575'ago jo Asymmetr ical Rh(S currents v.'ere determined in accordance vti th the appendix of Ai EE "Standard for Air SvIi tches, insul ator Units and 8us Supports",
Publ.
No, 22, dated
- lharcn, l960; see curve h'l of F
5..
igo Certification
-(Continued
)
Al l measurerm nts nero made in accordance vIith the appl icablo standard specifications.
Common sound engineering practices v(ero fol lovIed in measurements nor spec ifical ly standardized, Statements made and data shovin in this report,h(-57$, con-s ist ing of 5 pages, are to rho best of my knowledge and bol lef~
correct vjithin. the usual l imits of commcrclai testing practice, Test v,'as nltnessed by '.(r.
Jim Kel ly, Engineer, Nuclear
~
Penotrat ion Engineering, of Crousc-H~inds
- Company,
..; Tost conducted by:
'L
~
Joseph Sudz i us Tost Engineer
~ =
Approved by:
(( i
~
~ 1.
Ale" Vitkus Chi o f Eng incor
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NRP PEhr TRATICCf SHORT CIRCUIT TEST ON 42 ARTS LOH VOLTAGE UNIT DEVICE TESTED A Crouse-Hinds Company low per Catalog No. 0100253-',
IIAll 1IBII d ttCtl voltage electrical penetration
- assembly, Sample No. 2, having three (3) pairs of cables identified as Pairs C
The Crouse-Hinds test sample was installed in the High Current Laboratory and each pair of cables were connected, in turn, to the A and B phases of a 4375 kVA generator and subjected to a total of seven (7) single phase short circuit tests at individual, current magnitudes, ranging fxom 8.56 total kA (Trial jl) to 37.4 total kA (Trial g7) measured at maximum crest of first period.
Each of the three pairs consisted of adjacent cables in 'the penetration
- assembly, and each pai was short circuited by a short length of cable at far end of sample.
There was no external bracing or mechanical support of the free ends of cables for Trials No. 1 through No. 6.
Prior to Trial No. 7 (last t'est), the free ends of "C" cable pair were taped together with glass tape (at both line and short circuit ends).
The test current was initiated by a synchxonously controlled making switcn and interrupted by the generator back-up breaker.
Duration of current flow ranged from 2 to 4 cycles.
Measurements of insulation resistance, conductor resistance and gas leakage de-tection were made on'each cable pair before est, after Trials No.
3 and No. 7.
The insulation resistance was measured with a 500 volt meggar set.
The conductor resistance was measured with a Kelvin Bridge.
The gas leakage detection checks were made at 65 PSI of air with a bubble solution known as "Snoop".
Temperature measurements were made midway o2 shorting cable with a thexocouple and bridge, aWer Trials No.
5 and No. 7.
A Siemens Magnetic OsciU.omat was used to monitor the current flow and time for all trials.
RESULTS 1.
Three external sp3.ices or joints failed when cable pair "A" was subjected to approximately 37.0 total kA, Trial No. 6.
2.
Cable pair "C", having the additional strength, contributed by the glass tape wrapping, withstood 37.4 total kA.
3.
Refer to Tabulations of Data fox complete listing of current measuxements, insulation resistance, conductor resistance and observations.
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