ML20050C988
| ML20050C988 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/30/1979 |
| From: | ISOMEDIX, INC. |
| To: | |
| Shared Package | |
| ML20050C841 | List:
|
| References | |
| RTR-NUREG-0588, RTR-NUREG-588 IEB-79-01B, IEB-79-1B, NUDOCS 8204090466 | |
| Download: ML20050C988 (27) | |
Text
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.s -{ . aso m ecax , QUALIFICATION' TEST OF THERMALLY AGED AND UNAGED ELECTRIC CABLES UNDER A SIMULATED LOCA/DBE BY - SEQUENTIAL EXPOSURE TO ENVIRONMENTS OF RADIATION, STEAM AND
, CHEMICAL-SPRAY -
PERFORMED FOR ESSEX GROUP, POWER CONDUCTOR DIVISION LAFAYETTE, INDIANA *
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BY THE COMPONENT TESTING DIVISION
. ISOMEDIX, INC.
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! . ~'PARSIPPANY, NEW-rJERSEY
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JUNE, 1979 , l 1
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8204090466 820407 *
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<$= y . . L , (*- SECTION 1. INTRODUCTION AND
SUMMARY
A qualification test on low voltage power cables was performed in accordance with the suggestions contained in l IEEE 323-1974, "IEEE Standard for Qualifying Class lE Equip . ment for Nuclear Power Generating Stations", IEEE 383-1974, "IEEE Standard for Type Test of Class 1E Electric Cables, Field Splices, and ConnectionIs for Nuclear Power- Gen,erating . Stations", and in accordance with the temperature / pressure . profile provided by Essex Group.
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The test was conducted to determine the ~ ability of the cables to function during postulated environmental con-ditions simulating normal and design basis ' event / loss-of- - coolant acciden,t service cond5[7ons expected within the con-
'tainment area of a nuclear power generating station.
Eighteen electric cable samples were subjected to radiation followed by a 34 day exposure to environments of steam and chemical-spray, while electrically energized at
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rated voltage and current. The energizing consisted of a potential of 600 volts (a.c.) between conductor and ghound
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and current loading of 20 amps. Approximately 50 feet of each cable sample was sub- .- jected to the exposure environments. The samples were ,irradi-ated in a Cobalt-60 field of gamma radiation at a rate resulting in a total accumulated dose of 200 megarads.
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ISOMEDIX, IN C. . COMPONfnT TESTINC DMS103 309 VIATCHUt:G AVEtiUE. VIEST 0%?:GE. f:EV/ JERSEY 0705
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Measurements o'f insulation resistance, made at 500 Vde, l
' were performed before and af ter each of the environmental . I exposure periods and periodically during the steam - . .
/ chemical- .
I High voltage withstand tests
- spray exposure period ,(LOCA) .
were conducted at the end of the steam / chemical-spray exposure period following a 4.0 times $:able diameter mandrel bend' test. Thirteen (of the eighteen) cables withstcod the entire . test exposure.
'Five cables were not energized during the ,
LOCA due to shorting to ground. All the samples, except #16, withstood the high voltage The high voltage
- applied at the conclusion of the expostire. ,
' withstand test was conducted at a voltage level of 2.4 KVac, .
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The ( corresponding .to 80 volts / mil 5f: insulation ' thickness. ( ,' , sar.,2.5-s had measured charging / leakage curr'ents between 1.5 and 1<:ss than 50 milliamps after 5 minutes at the applied voltage. The test program was conducted during the time period of January,1979 through May,1979 at the test fa'cilities of . Isomedix, Inc., in Parsippany, New Jersey. , 8 D L.- . i
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, SECTION 3. TEST PROGRAM ,
3.1 PURPOSE The purpose of the program is to provide qualificat on tests on electric cables in accordance with the suggestions -
. I contained in IEE 323-1974, "IEEE Standards for Qualifyin'g Class 1E Equipment for Nuclear Power Generating Stations",
IEEE 383-1974, "IEEE Standard for Type Test of Class 1E Electric Cables, Field Splices and . Connections for Nuclear Power Generating Stations", and in accordance with the. temperature / pressure profile as proyided by Essex Group. , 3.2 DISSCUSSIONS , 3.2.1 PHASE I - RADIATION AGING . The cable samples are to be exposed to gamma radiation
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W .. :,;. A , from a. Cobalt-60 source %t a nominal dose rate not to exceed 1.0 megarads per hour to an -accumulated total dose of 200 megarads. ,
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3.2.2 PHASE II - LOCA SIMULATION . At the conclusion of the radiation exposure, the samp15s will be exposed to a simulated loss-of-coolant accident (LOCA) environment by application of steam and chemical-spray for a period of 34 days in accordance with the , temperature / pressure profile as shown if Figure 1. The -
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samples are to be continuously sprayed with a ct}emical , , I solution consisting of 0.28 molar boric acid in solution with 0.94 molar sodium thiosulfate buffered with sodium L . , ISOMEDIX, IN C. - t COMPONENT TESTING OMS 10# . 3D WATCHU?:G AVD:UE. WEST ORA?:CE. i:EW JERSEY 07052 . (201) 735.Stt t
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( ., . r . . j , hydroxide to a pH between 8.0 and 11.0 at room temperature.
. The spray rate is to be 0.25 gpm/ft of exterior specimen surface. . . . .
-3.2.3 PHASE III - POST-LOCA TESTS ,
At the conclusion of the simulated LOCA event, the
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samples are to be removed from the mandrel, straightened . . and recoiled around a mandrel whose diameter is "40 times the cable diameter.- While so wound, the cables are to be immersed in water and subjected to ,a high voltage with-stand tests at 80 volts / mil of insulation thickness. '
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1 l'* 0 335 F/95 PSIG *- . .
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0 ( ( g 315 F/69 PSIG
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-s 271 F/28 PSIG i
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0 - j 271 280 F Within . E
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- i I I I T 15 HOURS.
7 DAYS - 34 DAYS
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4 TEST APPARATUS ~
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4.1 TEST CHAMDER -
- The test chamber used during the environmental exposure was a 24-inch ID by 33-inch high (straight side) vertical - I vessel with penetrations for conne,cting the cables to the .
energiring circuitry. Steam was admitted from the side of the vessel and directed a' gainst a baffle that distributed-it circumferentially in order to avoid direct impingement ' against the cables. A sight glass was positioned on the
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side of the chamber that allowed the solution level to be
- monitored to insure it did not rise above the level :
of the bottom of the cable mandrels.
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4.2 CABLE MOUNTING ..,' '" (
- p The cable samples were mounted on holding rods po-sitioned between two end cap flanges of metal mandrels, '
approximately 20 and 15 inches in diameter. Tie-wraps . were used to secure the cables ~in position relative to ,'
- the vertical ro'ds. The mandrels, with the cables, were' -
installed vertically inside the test vessel. Approximately - four feet of each cable end was brought through the center - of the mandrel. These ends were brought through the vessel . head penetrations, sealed and connected to the energizing lead wires. Sealing was effected by securing the cable ends in aluminum tubes with an epoxy compound. .The tubes were secured to the vessel by standard tube fittings.
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i IS O M E DIX, I N C. '
, CO.'JPONE//T TESTING DIVISION . 309 WATCi!UNG AVEnUF. WEST ORAt:CE. f;EW .!ERSEY 07032 - 001) 733.N11
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' The chemical solution was sprayed onto the cables >
collecting in the bottom of t.he vessel. It was then '. returned to a pump and recirculated. The flow rate - was measured with'a var $able area glass tube flow meter... . 4.4 ENERGIZING CIRCUITRY - During the steam and chemical-spray environmental, -
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exposure period, the cable samples were electrically energized by a 3JT -60Hz power source at a potential- - of 600 Vac and a current load of 20 amperes..
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The cable ends were s'66ured to ter;ninal blocks mounEed on the vessel head. "These terminal blocks were conn.ected to the energizing switch box whicli consisted of' knife switches arranged so that each cable could be individually monitored, isolated during measurements of insulation resistance, or removed from the circuit if a failure *
, oCCured.
Figure 2 is a schematic representation of the energizing connection circuitry. , 4.5 INSTRUMENTATION . Temperature was measured using a Type T thermocouple and pressure was measured with a gage and transducer. Temperatt
/ and pressure were recorded continuously'on potentiometric recording devices. ..
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- CURRENT . POTENTIAL CURRENT
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600 V 20 AMPS o (
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j X . , 3 - .. n y . m . f9 . 3 u . 3 (EVEN CONDU' C TORS OF CABLES .13 THRU 18) - m 8
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ACTUAL TEST
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SECTION 5. . != i 5.1 RADIATION AGING (PHASE I) . The cable samples were .p' laced in a radiation chamber n
- and subjected to a Cobalt-60 source of gamma radiation i at an exposure rate of approximately 0.75 megarads'pe'r ,
hour whic'h resulted in an accumulated dose of 205.5
- megarads. .
Appendix A contains the certification of radiation exposure for the samples. .
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5.2 LOCA SIMULATION (PHASE II) . At the start of the steam exposure, 'the cables were _ energized at 600 volts a.c." and 20 amperes. To initiate the ,e.xposure,. steam wfs rapidly admitted into the vessel raising the temperature and pressure to 280 F and.70 o psig within two minutes and to 346 F'at 113 psig within six minutes. The temperature and pressure were main- ~
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tained at 346 F and 113 psig for the' remainder of the
- - - - - - . . . ethree hour period of the transient. ..
At the end of the three hour transient, a controlled
- temperature drop was initiated that reduced'the temperat'.
o to 140 F over the next two hours. The second transient ,
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was then initiated by introducing steam that, raised the o temperature to 346 F and the pressure to 113 psig within ,
. six minutes. The conditions were maintained at this
(, level for the next three hours. . ISOMEDIX, I N C. u____._- - - _ _ _ _ _ _ _ _ _ _ _ _ - _ . _ _ _ _
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(- . . At that time the temperature and pressure vera reduced { O to 335 F at 95 psig and held for three hours before being
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. reduced to 315 F at 69 psig. These conditions', 315 F at 69 psig, were maintained for the next four hours. i o
After the four hours at 315 F/69 psig the conditions . ,
- were further reduced to 271 F at 28 psig and maintained
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at this' level for the balance of seven days. At that .
, o time, the temperature and pressure were reduced to 180 F and 3 psig. Compressed air was used to maintain the ,
3 psig pressure. These conditions were maintained for
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the remainder of the exposure period. The chemical-spray was started prior to the initiation I of steam and spray remained _on throu'ghout the entire LOCA - ( C. /- .
. simulation. The solution pH was maintained between 9.0 and 10.0. ,
At a total te'st time of 34 days, the system was shut down and the s amples were r~ e moved from the vessel and'iN-spected.,, _ During the LOCA simulation several noteworthy events took place. At an elapsed time of 0.1 hours, cable sample 16 caused
- the leakage current protection fuse to blow and was removed from the energizing circuitry because of a short to ground.
Shortly after cable 16 was removed, cable sampic 6 caused i l ,, the leakage current protection fuse to blow. At 0.6 hours clapsed time, samp.le 6 was removed from the energizing k i . circuitry. .. .
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. At approximately 4.9 hours elapsed time, the leakage w l l,' '
current protection fuse blow. Cabic 14 was found to ~
- have shorted to ground and was removed from further , '
i energization. _
' Af ter an elapsed time of 5.3 hours, cable sample 18. ,
shorted to the potting tube causing a small fire and ,
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-therefore was removed from the energizing ciruitry. -
Cable sample 15 caused the ' leakage c6rrent protection fuse to blow at an elapsed time of 7.3 hours.' The sample - was removed from the energizing' circuitry at that time . due to its shorting to ground. . r.
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5.3 POST-LOCA TESTS (PHASE III) At the conclusion of the LOCA simulation, the cables were removed from the mandrels, straightened, and re- . i coiled .aro'Und a mandrel having a diameter 40 times the , cabic diameter. The samples were immersed in water and . subjected to a high voltage withstand test at .a potential of 2.4 KOac (80 vo'lts'/ mil of insulation thickness) .
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- ISOMEDIX, IN C.
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vp t;* ,1 . SECTION 6. TEST RESULTS 6.1 ELECTRICAL ENERGIZING OF THE TEST CABLES _ Prior to initiating the steam exposure, the cables
. .. B were energiced 'at their full rated voltage (600-volt) ,
and current (20 Amperes). These values were maintained continously on samples 1 through 5, 7 through 13,'and , 17 throughout the 34 day exposure period excepe when measurements of insulation resistance were made. , , 6 .' 2 ' MEASUREMENTS OF INSULATION RESISTANCE (IR) IR measurements were made periodically durin' g the
- test program as a means of monitoring the relative
' performance of the test samples. Specifically, the
(- measurements were made'at the following times:
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- 1. Upon receipt of samples with samples immersed in water.
- 2. After the radiation exposure of a minimum of 200 megarz
' 3. After installation of the samples in the test vessel, before the LOCA, with the vessel flooded with water'.
- o - . . . . . . . . . . 4. Once during each of the two 346 F transients.
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- 5. Once during the 335 F plateau.
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- 6. Once during the 315 F plateau.
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- 7. Seven times during the 271 F plateau ..
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- 8. Eight times during the 180 F plateau. ,
- 9. At the conclusion of the LOCA simulation with the . .
samples still in the vessel and the vessel flooded . with water. (, - . . ISOMEDIX, IN C.
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. 1 The measurements were made after application of 500 Vdc held for one minute, unless specifically noted otherwise.
. Prior to making the IR measurements, the current ar.d voltage were removed from the samples.'Approximately 40 ,
minutes was required to make the IR measurements. At the
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conclusion of the IR measurements, the cables were re-energized. Table 2. contains~ the IR values of the cables. . . y . . C; .
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. . ,8 6.3 HIGH VOLTAGE WITHSTAND TEST . )
At the conclusion of the LOCA simulation, the cable samples were removed from the test vessel, straightened - and recoiled (40 times OD), immersed in water, and then , a high ac voltage was applied between the ' conductor and ,
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ground (water) . A potential ,of 2.4 Kvac was applied for- - 5 minutes. The results of this test are recorded in Table 3.
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- COMPO?/E//T TESTr.*/C DI'/ISIO?/ . 309 WATNfU::G AV!f:UE WEST OM?;"C MC'.*t 'ect:V et' . m
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.HIGH. VOLTAGE WITHSTAND TEST -
Voltage Applied ' Time Held - Leakage Current ' Cable Sample - (volts ac) (minutes) (mA)
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1 2400 5 5.0 2 . 2400 5 5.5 -
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3 . 2400 5 2.5, - 4 2400 5 'l.6 , 5 2400 2:58 . '20* 6 2400 - 1:53 20* . 7 2400 5 1.9 8 2400 5 1.5 - 9 - 2400 5 - 2.1 10 2400 5 3.3 -
.q M400 11 5 ,
1.9
. 12 2400 5 2.2 13 000(4) 2400 5 . 3.9 13 EVEN (3) 2400 -
5 - 3.4 , 14 ODD (4) 2400 5 9.4' -- 14 EVEN (3) 2400 5 - 6.0.
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IS' ODD (4 )" ' 2400 5 2. '6 15 EVEN (3) 2400 5 4 2.8 I
,16 ODD (4) 2400 . ---
Failed on Rise
,16 EVEN (3) 2400 ---
Failed on Rise ,
^
l7 ODD (4) 2400 5 - 4.1 17 EVEN (3) 2400 5 3.8
- 18 ODD (4) 2400 5 6.2 18 EVEN (3) 2400 5 5.1
- Samples 5 and 6 were retested on another lii-Pot Tester and both held
( the 2400 volts for 5 minutes. Leakage current for both was less than 50 milliamps. . NOTE: Cable 15 contained an cicctrical burnout which was removed for the high voltage test.
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SECTION 7. CONCLUSION . Cable Samples 1, 2, 3, 4, 5, 7, 8, 9, 10, 11,,12, 13, , and 17 passed the , entire test program. These samples were ,
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cnergized at'their rated voltage (600 volts ac) and current ,
' load of 20 amperes throughout the entire LOCA Simulation.'
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Cable Samples,6, 14, 15, 16, and 18 were not energized ' ,
-" for the entire LOCA' simulation, but did withstand the applied ,
high voltage. ' Cable sample '16 was' not energized during the LOCA simulation and did not withstand the applied high . voltage. '. _ The failure of samples 6,14 and 18 to be energized during the , LOCA simulation was due to a short located in the potted tubes. The failure of sample 15 was due to an electrical burnout. .
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. 1 ISOMEDIX, IN C. -
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. RADIATION CERTIFICATION .
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I FC B . aw e - s o rvi s o m . , k March 19, 1979 . TO: - Tejinder Sachdeva, " Manager, Component Testing . FROM: Lou Castaldi .. .
SUBJECT:
Radiati'on Exposure of Essex Cables . on a Double Mandrel This will summarize parameters pertinent to the irradiation of a
- double mandrel wrapped with cable samples as' per Essex Group Purchase Order ll4P-09709 and your Special- Radiation Request No. 0058.
The double mandrel was placed in a Cobalt-60 gamma field in an up-right position which paralleled the long axis of the radiation source. The double mandrel was exposed at each of four (4) quadrants as marked' by numbers at the top of the mandrels. By integrating the dose at any point on the mandrels during its 4-position exposure, an average dose rate was obtained which, when multip.l.ied by the total exposure time,
' yields the total dose. .q; ,
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Ths double mandrel was exposed for 274 hours at an average dose rate of 0.75 megarads per hour yielding a total dose of 205.5 megarads. The double mandrel was rotated 900 approximately every 68.5 hours to obtain a uniform dosage. .
. Dosimetry was performed using an Atomic Energy of Canada, Ltd. (AECL) ,
Red Perspex system with Type BC-2 readout. Calibration of.the Perspex is made by AECL using Ceric dosimetry traceable to the U.S. National
... Bureau of Standards. Isomedix regularly cross-calibrates its AECL' .
system with an in-house Harwell Perspex system, and makes semi-annual calibrations directly with NBS, using the NBS Radiochromic Dye system.
' A copy of the dosimetry correlation report is available upon request.
Irradiation was conducted in air at ambient temperature and pressure. Radiant heat from the source heated the samples somewhat, but the - temperature did not exceed 85 F, as indicated by previous measurements'.
- on an oil solution in the same relative position. ,.
Irradiation was initiated on January 24, 1979, and was completed on February 7, 1979.
< , . - a LouLCastaldi
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{ . e p * . . d APPENDIX B . INSTRUMENTATION
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a ISOMEDIX, IN C. .
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J J (,- . ISOMEDIX TEST EQUIPMENT LIST SUPPORT EQUIPMENT , NAME SERIAL # - CLOCKS - Cramer 1948 .
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. .- . Meylan 161 .
, , . .Edwa'rds 240 -
- DOSIMETERS -
. Eon . 4274 .
Johnson 617 Jordan ' 2241 .
.,' J T
(. .- Victoreen 11CM IM 1 l
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( . Is o m e did In c. + 25 Eastmans Fload. Parsippany. New Jersey 07054 (201) 8S7-4700
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. ISOMEDIX TEST EQUIPMENT LIST -
Name Manufacturer' Model S/N Range Calibrati~on' Accuracy , ' Frequency Temp. Esterline-Recorder Ell 24". 0-510 F 10.25% An'ually, Angus n September Pressure Westronics RM11B { Recorder 25153 0-156 12.5 % psig Annually,' _of Span April - Air Gages U.S. Gage 0-200 Prior to Test (3) '
'lt of -
. Span Thermo- Omega Eng. Type T couples , 3/4%, Prior.. to Test Hi-Pot Tester Bend'x, i Inc. 60B4-1-A .. -
0-10,000 . Annually,
,Vac or Vdc 12%,f2%
April Megohmeter General Radio 1864 5652
;i 10-1090gc 5-2X10 12% Annually,
,, ri ohm . April Multimeter Simpson -
260 ' 0-20 Mohm f2 of Annually, scale
- ARC April Temp. Recorder
- Esterline , Ell 24E Q-400 F
- Angus -
, 10.25% Annually, -
. of Span September ,
Amprobe Amprobe Instruments
' 0-6/15/40/100 i3% Annually,'
(
, Amps
- Full Scale April
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. January 12, 1979 - -'
The following cable was tested this date and passed all requirements of paragraph 2.5 of IEEE 383-1974 Standard. . 6X 7/C - #12 AWG,.600V, 4/C X-1406 EP, 3/C X-1406M EP. Mylar-Glass,X-1436 Hyp. Overall Jacket. IP-1067.
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. SAMPLE 13 ,
. Test Parameter and results and follows: .
Burn Time (min.) 20 - Fire Temp. ( E) 1520 +40 - -
. -40 .
Air Pressure ~(cm-H2O) 4.4 - Gas Pressure (cm-H2O) -2.8 . Gas Type '
. Propane f
Core Damage ,(inches) ". (.
,, 38 ,
. ..~2 ~~ -
Jacket Damage (inches) 42 - After*ourn Time (min.)
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0 . T. bbM' ' R. E Schoolcraft , 1
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, January 12, 1979- '
Thefollowingcablewastestedth'isdateandpassedalh. requirements of parpgraph 2.5 of IEEE 383-1974 Standard. 6X 7/C #12 AWG, 600V, 4/C X-1438-M EP, 3/C X-1438 EP, ' Mylar-Asbestos / X-1438 EP Overall Jacket. XP 1068. SRsLE 15 - Test Parameters and results as follows: . Burn Time (min.)
, 20 - -
. Fire Temp. (oF) . . 1520 +40 - -
240 Air Presure (cm-H20) 4.4 ,
. - Gas Pressure (cm-H2O) -2.8 .
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Gas Type - Propanc . Core Demage (inches) 40 - Jac't.et Damage (inches) . 54
, Afterburn Tinie (min.) 0
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4M t.%
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- March 19, 1979 .
( The following cable was tested t'his date and failed all '- requirements of paragraph 2.5 of IEEE 383-1974 Standard. 6X 7/C - #12,.600V, 4/C X-1438-M EP, 3/C X-1438 EP, Mylar-Glass /X-1438 EP Overall Jacket. XP-1068 . , ,
' ' ~
> S.c!PLE 15 - Test Parameters And Results As Follows:
. . . ~'
Burn Time (Min.) 20 .
. +40' -
Fire Temp. (OF) 1520 -40 - Air Pres'sure (cm-H 2O) 4.4 Gas Pressure .(cm-H 2O) :2.8 Gas Type - Propane . - Core Damage (inches) Total - .
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Jacket' Damage.(inches) . Total - gt. ,
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Afterburn Time .(Min.) . 0 ,
. WArc. 2 R. E. Schoolcraft '
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{ , . January 12, 1979 , The following cable was tested this date and passed all requirements of paragraph 2.5 of IEEE 383-1974 Standard. - 6X 7/C - #12 AWG, 600V, 4/C X-1406-M EP*/ X1437 Hyp. Jkt., . 3/C X-1406-M EP / X-1437 EP Jkt., Mylar-Glass / X-14373 XP-1069. Colorable Hyp. Overall Jacket '
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I S.roIPLE 17- - Test parameters and results as follows: . . Burn Time (min.) 20 , Fire Temp. (oF) , 1520 +40 - *
-40 .
Air Pressure (cm-H20) - 4.4 Gas Pressure (cm-H2O) -2.8 .
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- g. Gas Type , .p. '" Propane. . -
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- Core Damage (inches) .
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. 38 -
JacP.et Damage (inches) 48 . . . Afterburn Time (min.) O 4 L+-c.. % A F
- R. E; Schoolcraft .
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