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APPENDIX R MULTIPLE HIGH IMPEDANCE CABLE FAULT FLAME TEST REPORT MAY 27, 1988 PREPARED BY PHILADELPHIA ELECTRIC COMPANY PHILADELPHIA, PA. 19101 NUCLEAR ENGINEERING DEPAR~ MENT ENGINEERING DIVISION N2-1, 2301 f%RKET STREET PREPARED BY: -I) #-2 7- // | |||
: 4. B. fock, Electrical Engineer Power Distribution Configuration Branch REVIEWED BY: \m, S 'D ' % | |||
R.M.dones( Acting Branch Head f Power DistrN>ution Configuration Branch l APPROVED BY: , | |||
W.d.pfer,Mgager ' / | |||
Engineering Services Section l | |||
APPROVED SY: | |||
d b W T[ | |||
J. 'm(rke II, Branch Ehginedr 7 te als Laboratory | |||
'3 sting and Laboratories Division , | |||
8806210052 880615 '. 1 PDR ADOCK 05000277 - | |||
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$ DCD ; | |||
Page i Revision Record Revision Page Section Description Date 0 All All First Issue May 27, 1988 l | |||
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i Approvals Revision Date Prepared By Reviewed By Approved By | |||
i Page Ii Table of Contents Section Title Pm 1.0 Objective 1 2.0 SuTmary 2 3.0 Conclusions 3 4.0 Introduction 4 5.0 Test Simulation 6 5.1 Flame Source 6 5.2 Cable and Cable Tray 6 5.3 Test Circuit 8 5.3.1 Test No. 1 8 5.3.2 Test No. 2 8 5.3.3 Tost No. 3 8 6.0 Test Procedure 10 6.1 Flame Source Preparation 10 6.2 Cable Tray Preparation 11 6.3 Test Rocm Preparation 11 6.4 Power Supply 12 6.5 Test Circuit Connection 12 6.6 Test Sequence 13 7.0 Test Results 15 7.1 Test No I 15 7.2 Test No. 2 17 7.3 Test No. 3 18 8.0 Figures 21 9.0 Pictures 36 10.0 List of References 64 11.0 List of Data Acquisition Instrunents 65 | |||
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NOTE Utilization of this test report by persons without access to pertinent factors, and without proper regard for their purpose could lead to erroneous conclusions. Philadelphia Electric Comany cannot asstme responsibility for the use of this report not under Its direct control. | |||
PHILADELPHIA ELECTRIC COMPANY 2301 Market Street Philadelphia, PA 19101 | |||
1.0 Objective This test report presents the test results of three separate energized cable flame tests. The tests were performed to: (1) determine the characteristics of fire induced cable insulation failures as they relate to leakage current through Insulation degraded by fire, (2) determine the effect on a ccmnon power supply where multiple Individually fused cables are Installed in a manner simulating typical power plant practice and are subjected to a fire source. The results will be used to consider the effects of fire related simultaneous high impedance faults in compilance with 10CFR50, Appendix R. | |||
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; 1 l l l- 2.0 Strivna ry Generic Letter 86-10 "Irrelementation of Fire Protection Requi rements" (Apri l 2f+, 1986), Enclosure 2 Itan 5.3.8 requires < | |||
consideration of simultaneous high Impedance faults for all conTnon bus associated cables located in a fire area. | |||
A series of energized cable flame tests were conducted in order i to address the concerns identified In the generic letter. The tests I | |||
Included a simulated 120 VAC distribution panel arrangement with l coordinated supply circuit breaker and fused load circuits. The results of this test will be used to consider simultaneous high Impedance faults for spect fic cormen bus arrangements. | |||
This report describes the test specimen selection, the test set-up and procedure and presents the test results and conclusions. | |||
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l 3.0 conclusions The cable flame tests reported upon herein were conducted by Philadelphia Electric Conpany to provide data which supports the premise that simultaneous high impedance faults from fire damage do not occur in a menner such that electrical coordination of power sources (as designed for PECo nuclear facilities) is Jeopard i zed. The test results confirm the pranise as stated. | |||
Supporting evidence from Tests 1 and 2 includes the following: | |||
: 1. The time to failure varies randomly within ranges which are dependent on proximity to flame source and nunber of Intervening cables between a subject cable and the flane source. | |||
: 2. The failure mode consists of an Initial period of transient insulation breakdown which is very current Ilmited as opposed to approaching the trip threshold of fuse or breaker sizes used in power distribution panels. | |||
: 3. The insulation resistance or alternatively the leakage current during the initial Insulation breakdown transient has a wavefonn with alternating peaks and , | |||
valleys, j 4 The period of Initial transient high impedance Insulation breakdoan is generally enveloped within a 1 minute duration. | |||
In addition to fully supporting the results of Tests 1 & 2, l Test 3 provides the folloaing: | |||
: 5. Failure of Insulation after the Initial transient breakdown, cascades to a very Icw insulation Impedance within less than 1 second. | |||
: 6. The electrical protection device actuation will be i principally influenced by the high current during the l cascading insulation breakdown as opposed to the lower , | |||
Initial transient leakage current. The fault during the l cascading Insulation breakdown is less than 1 second in l duration. l 1 | |||
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4.0 Introduction The PBAPS Safe and Alternative Shutdown System Analysis evaluated each plant fire area to determine the affectr of an | |||
. Appendix R fire on the ability to achieve safe shutdown. For analysis, fire damage to electrical power, control and Instrunentation cables was defined as short, ground, optsn or hot short circuits. Associated circuits (safe shutdown or non-safe shutdown) were considered those i.e. circuits that have a conmon power source or comon enclosure with the active safe shutdown equipment. | |||
A 10CFR50, Appendix R Electrical Coordination St0dy was performed for PBAPS safe shutdown electrical buses frcrn 4.16KV to 120VAC and including the 125/250 VDC System. | |||
The coordination study detennined that the existing design is coordinated and that faults on associated circuits due to flame damage, of the type analyzed, are not a concern. | |||
Also, fault current available at all distribution levels is adequate for the proper operation of the current actuated protective devices. | |||
In 1986 the NRC Issued Generic Letter 86-10 (April 24, 1986) "Inplementation of Fire Protection Requirements". | |||
Enclosure 2 of this letter provided NRC responses to questions raised by the Industry during a series of NRC Regicnal , | |||
Workshops. Question 5.3.8" Short Circuit Coordination I Studies," asked If high Impedance faults should be considered | |||
* l in the coordination studies. The NRC response requires l that simultaneous high Impedance faults (below the trip point ( | |||
for the breaker of each Individual circult) for all associated j circuits Iccated in the fire area, should be considered in i the evaluation of the safe shutdown capability. | |||
During the NRC review meeting on PBAPS Appendix R held, July 30, 1987, PECo responded to questions regarding nultiple high Impedance faults stating that the prospect that they j occur on associated circuits In a fire area is very low i because the raceway system is solidly grounded and nuclear grade cable is used. | |||
A subsequent review of NUREG-0050 and 0061 associated with the Browns Ferry Fire was conducted. The fire damage resulting to cables Installed in cable tray and conduit was reported to be caused by flame and tecperature. The loss of control circuit function associated with these cables was reportedly due to short circuits. Evidence of high Incedance faults or tripping of related upstream protective device trips was not found in these reports. | |||
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1 l Nuclear Industry cable suppliers were contacted as well l | |||
as PECo cable test experts to gain insights related to their experience with failure nodes of cable during flane testing. | |||
Significant flane testing to IEEE 383-1974 has been perforned on 600 Volt multiconductor nuclear grade cables. The l acceptance criteria used in these tests has been: (1) time to short circuit, (2) flane propagation and (3) char distance. | |||
Testing was conducted on energized cables using Indicating lights to signal when conductor to conductor or conductor to ground Insulation breakdown occurred. | |||
This test report presents the results of three separate | |||
; flane tests on energized cables, the purpose of which was to I | |||
collect data on high Impedance faults. The tests were perforned using high speed recording analyzers and data loggers to measure transient changes In cable Insulation resistance and leakage current at tine Intervals as low as 0.5 milliseconds. | |||
The first two tests were conducted on a 120 VAC energized multiconductor power cable circuit. Insulation leakage current resulting from flane danage was neasured using a high speed recording analyzer. The recorder was autocatically triggered at a low insulation resistance value. The third test was run using a coordinated 120 VAC circuit breaker and fuse arrangenent. Current through each fuse was neasured using transducers and recorded by an IBM-PC and data logger. | |||
These tests were not tenminated until a tine after the energized cables developed short circuits, in order to verify coordination. | |||
In considering typical poner plant voltage levels, testing was perforced at 120VAC because 120VAC buses are the nore nunerous, share more of the associated cable loads and are considered nore susceptible to high Impedance faults. | |||
Testing at 120VAC is conservative since at higher voltages, additional voltage stress adds to cable flane danege and ; | |||
cable short circulting. Protective device clearing levels l will occur quicker than at lower voltage levels. ) | |||
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5.0 Test simulation Testing was perfonned in the PECo test laboratories. A roon In the Material Testing Laboratory measuring 19.5 X 10.5 X 12 feet with a glass observation window was used. The room was ventilated by means of two exhaust hoods, used to clear the stroke and furnes produced from the flame test. | |||
The cable, cable tray and the flame source were located in the test rocm. Electrical connections to the cables, gas pipir.g to the burner and other Instrunentation were routed outside the room through sealed penetrations. | |||
5.1 Flame Source A 70,000 BTU per hour ribbon gas burner using commercial grade propane as the fuel was used fcr the flame. The flame source and set-up met the requirements of IEEE 383-1974, Section 2.5 Flame Test, and Regulatory Guide 1.131, Issued for conTnent August 1977. | |||
This arrangement was chosen since It represents a rectgnized Industry standard a-d the flame test is repeatable. | |||
Ccmnercial grade propane and air were premixed using a venturl mixer and supplied to the gas burner. The propane flow rate corresponded to a heat Input rate of approximately 70,000 1 1600 BTU per hour based on the gross heating value of propane, and the supply airflow of 163 2 10 standard cubic feet per hour. Flow rates were nonitored using two callbrated rotameters. The set-up foi the flame source is shown in Figures 1 and 2. | |||
5.2 Cable and Cable Tray The cable and cable tray arrangement was set up to sinulate fleid installed conditions and facilitate the testing within the confines of the test facility. | |||
A horizontal tray configuration was used. It was loaded with single and multiconductor cables tyrically used in 120VAC power and control circults. | |||
The test tray used was open ladder steel construction, 4 foot long, 6 inches wide and with 3 Inch sideralls. | |||
The single and multiconductor cables were Installed in a loop with both ends exiting the same end of the tray to facilitate electrical connections. The percent fill of cable tray was 28.5%. The cable Installation approximated three (3) levels of cables In the tray (bottenHniddle-top), as i | |||
shown in Figures 4 and Picture 3. | |||
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The cables used in the test were procured under PECo Specification 125-P-7 for PBAPS. The cables were obtained from PECo stores by material code nurber. The followim cables were used: | |||
PECo Materlai Code Manufacturer Description 125-09508 Brand-REX 1/C #12, Copper conductor, 600 Volt cross-linked polyethylene Insulation. | |||
125-09512 Rockbestos 4/C #12, Copper Conductor, 600 Volt cross-linked polyethylene insulation with an overall black flame retardant neoprene. | |||
125-09516 Brand-REX 2/C #10, Copper Conductor, 600 Volt cross-linked polyethylene Insulation with an overall black flaan retardant neoprene. | |||
Each flane test was conducted using randomly looped lengths of the above cable Installed per Section 6.2. The following Is a sunnery of the numbers and types of cables used in each test: | |||
12-Cables - 2/C M10 (Code 125-09516) 12-Cables - 4/C #12 (Code 125-09512) 6 -Cables - 1/C N12 (Code 125-09508) 7 | |||
The cables have the following construction: | |||
Conductors Thickness-MILS 0.D. Inches Code No No. KCMIL(AWG) Strands insulation Jacket Min. Max. | |||
125-09508 1 12 7 30 None 0.152 0.167 125-09512 4 12 7 30 45 0.475 0.522 125-09516 2 10 7 30 45 0.460 0.506 5.3 Test circuit 5.3.1 Test-No.1 A recording analyzer measured the voltage across a resistance load box which was proportional to the ieakage current caused by insulation flame damage to a 4/C 1612 energized cable test specimen located in the cable tray. Two (2) conductors of the test specimen were electrically connected together and tied to the line side of the power supply through the resistive load box as shown in Figure 3. All other cable conductors in the tray were electrically connected to the steel tray which was tied to the neutral side of the power supply. The steel tray and supports were isolated frcm ground. With the circuit energized in the initial condition prior to applying the flame source, there was no current ficw in the circuit. The current path due to cable Insulation degradation would be frcm the energized conductors across the insulation to a neutral conriected conductor or to the cable tray. This current would be a direct result of the cable / conductor insulation flame damage and leakag:: | |||
current. Pictures 1, 2 and 3 show the test set-up and instrunentation. | |||
A 120VAC test lab pcwer supply, capable of providing 50 amperes, was connected through a supply circuit breaker to the test set-up. Since there was no load current on the energized cable, the measured current was purely leakagc. | |||
The recording function of the analyzer was autcmatically triggered when the leakage resistance dropped to (reached) 200 ohns. The trigger had a 400 millisecond (ms) preset, so that 400 ms of data prior to trigger was recorded. The recorder took sample readings each 0.5 millisecond for a 4 second period (or 8000 data points). Each sample data point consisted of a reading of the power supply voltage and the voltage across the fixed resistance 8 | |||
Ioad box. Using these values, the analyzer was set-up to calculate the leakage resistance and leakage current. Figure 5 shows the range, trigger and program used by the recording analyzer for these calculations. | |||
. The data is displayed in graph form or dt.gitized in tabular form. A permanent hard copy of the digitized data was made for docunentation retrieval . | |||
5.3.2 Test No.2 The test set-up and methodologies were the same as for test No,' meept the recording analyzer was triggered at 'ms of Insulation leakage resistance Instead of 200 otins. Also the recording time was increased frcm 4000 milliseconds to 8000 milliseconds. | |||
Data points were measured and recorded each millisecond. | |||
This second test was performed to confirm the results and repeatability of the first test. | |||
5.3.3 Teac No.3 This test was conducted using the same flame source and cable tray arrangements as the first two tests. | |||
Eight (8) circuits representing 66% of the cables were energized at 120VAC and fault current was monitored durIng the entire duratton of the test as shown in Figures 10 and 11. Power for each circuit was supplied through Individual fuses which were fed frcm a ccrmen circuit breaker simulating a coordinated ccxmen bus arrangement. The flame test was run until after either the breaker tripped or the fuses blew, in order to test for high inpedance fault effects on electrical coordination. | |||
The following circuit breakers and fuses were obtained frcm the PBAPS Storeroom for use in the test: | |||
Type Manufacturer DeserIptIon Circuit Breaker Westinghouse Type EB, TM 30A @l20VAC Fuse, 10A Bussmann Type KTK Fuse, 30A Bussmann Type KTK i Fuse, 30A Bussmann Class RKS, Type FRN Six (6) of the energized circuits were fused with l Bussmann, Type KTK, 10 Am. fuses. The remaining l | |||
two (2) circuits were fused with Bussmann, Type KTK and FRN 30 Am. fuses, as shown In Figure 10 and Picture 11. | |||
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The current through the mein supply circuit breaker and each fused circuit was nonitored and recorded. | |||
A calibrated current transducer was used to monitor current through the fuses. The output of each transducer was connected to a Fluke 2280 B Data Logger. The current supp1!ed through the circuit breaker was nonitored by the logger. | |||
The test measured and recorded the leckage current through the circuit breaker and each Individual fused circuit as a function of tlne. Each current data point was scanned and recorded once a second. | |||
The test data shows the time when leakage current started to flow and the point at which the fuse f a i l ed. Continuity checks were nede after the test to confinn that the fuses had failed. | |||
The data logger ir.terfaced with a RS232 Interface rrodem to an IBM-PC, so that the data was stored on a floppy disc as shown in Figure 11. The data was then printed and plotted 6.0 Test Procedure 6.1 Flame Source Preparation The sane flame source set-up was used for all three (3) tests. The ribbon burner, alr-gas venturl mixer, air and gas rotameters and 20 lb. ccmrercial propane gas tank were all connected per Figure 2. All connections were sealed and the caroleted installation was checked for leaks with gas sniffing devices. | |||
The temperature of the flame source was checked prior to running the test. Af ter the flame source was ignited, the rotaneters were adjusted by needle valves for 70,000 BTU /HR. | |||
The tarperature was measured using a type "K" thennocouple, located in the flane, 3 inches above the top of the burner face. The temperatures were in the range of 1500 0F to 1600 CF, during the tests. | |||
The thermocouple remained in place and was used to monitor the temperature during all three tests. | |||
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6.2. Cable Tray Preparation The same cable tray arrangement and cable loading was used for aII three (3) tests. Sultable lengths of the spectfled types of cable were individually randcmly Irid in a loop configuration, inside the 4 foot long cable tray. Both ends of each cable exited frcm the same side of tl'e t ray to . | |||
facilitate electrical connections. | |||
For tests 1 and 2,the non-energized cable conductors were connected together to the steel cable tray and tled to the power supply neutral. The cable tray was sup;orted horizontally over the flarre source (burner) usir<; a four legged frame. The frame was Isolated frcm grour.;' using insulators under each of the four 1 cgs, as shcw in Picture 3. | |||
In both tests a 4 conductor cable was energized and monitored for leakage current. Two (2) of the conductors were connected together and tied to the line side of the power supply. The other two (2) conductors were tied to the non-energized conductors, cable tray and neutral side of the power supply. | |||
Any leakage current between the line side conductors and other conductors or cable tray was measured and recorded. | |||
For test nurber 3, elght (8) cables were energized with 120 VAC and monitored (4-2 conductor and 4-4 conductor cables). | |||
Two (2) of the conductors of the 4 conductor cable were tied together and connected to the line side of the power supply. | |||
The other two (2) conductors were tied to neutral along with all non-energized cables and the cable tray. One (1) conductor of the 2-corWuctor cable was tied to IIne and the other to neutral, as shown in Figure 10 and Picture 12. | |||
6.3 Test _Rocm Preparation Only the ribbon gas burner, cable tray and cable and thertrocouple were inside the test rocm. All piping, electrical and Instrtmentation connections exited the room via sealed penetrations. All rocm openings were sealed with the l I | |||
exception of a louvered opening on the main door to the room. | |||
During the test two exhaust hood ventilation fans were kept running, which kept the rocm at a slight negative pressure l with respect to the rest of the test laboratory area. This j caused air ficw frcm the test laboratory area tc the test rocm, via a 2' X 2' louvered opening in the door. The smoke , | |||
was exhausted to the outside through the main building ventilation system and ductwork (a snoke detector in the main ventilation ductwork was bypassed to avoid autcmatic shutdown of the ventilation system). The volune of the room is 2457 cubic feet. | |||
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Each of the three tests were video taped using a cacorder g; located outside the test rocm. The filming was performed '/ | |||
through glass observation windows in the test rocm. | |||
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6.4 Pcwer Sucoll U | |||
The capability of.the 120 yAC, 60 HZ. power supply was checkedbyconnectingadirectshortcircuitacrot.s'.be.ku.ver supply and nuasuring the mcmentary short circuit cu. rent. , | |||
The current was recorded at'49.9 anperes using a h;ok! | |||
Olgital Tong Set. , | |||
The pcwer supply to the test' specimen was corboitEd thrcugh a circuit breaker to protect the test laboratory Inst runentat ion. The cable lengths were short (less than 10') and therefore cable resistance had neg11 gable effect on the current supply. < | |||
6.5. Test Circuit Connection The circuit connections for tests nunbers 1 and 2 are stovn in Figure 3. The basic circuit is a voltage divider , | |||
network. Two (2) resistances are in series. One (1) ) | |||
resistance is a fixed value resistance load, which provides l two functions: | |||
: 1) Voltage Input to the analyzing recorders | |||
: 2) Limits the fault current to below 50 amperes The voltage input to the recorder was proportional to the current flow thrcugh 2.a circuit. Initially there was no current ficw due to the series resistance of the undamaged cable Insulatice, which is on the order of a hundred megohms. | |||
As cable insultatloc flame damage occured and the resistance dropped, a voltage proportional to leakne current throgh this resistance developed across the fixed resistance load box. I Resistarce values of the load box were set and measured i prior to the tes't along with megohnneter meesurements of the I cable insulation resistance. All connections were made and i checked including operation of the analyzer prior to the l test. | |||
l After the data frcm the test was collected and analyzed, manual calculations were performed to verify the Internal program used to calculate leakage resistance and current. | |||
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if The circuit connections for test nunber 3 is shown on Figures 10 and 11. The test circuit was set-up to simulate a 3, ccordinated breaker r , t'use panel arrangement. Each of eight (O energized cables were reparately fused and all , ere supplied tnrough a ccamon circuit breaker. | |||
' A current-to-millivolt transducer was wirec In series with each circult and used to measure leakage current due to cable insulation damage from the flame source. The entr.ut frcm each transducer was conr.ccted to a data logger. Total current through the circuit breaker was measured with a clamp on anmeter arri connected to the data logger. The Data s I Logger hed a scan rato of 10 channels /second. | |||
The Data Logger was' connected via a.1 RS232 Interface modem int erface to an IBM-FC Data frcm the test was a floppy disc, thrt ugh this Interface. and stored for future enalysis. | |||
Data was collected at'a 1 second scan rate frem the beginning of the test to the conclusion. The test was concluded alter the majority of the circults shorted and their fuses failed as | |||
! a result of f)are damage. | |||
6.5 Test Sequence' Test monitoring and data collection for .he three flame tests was autcmated. The only manually recorded datr. | |||
was the following. , | |||
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: 1. Test room arblent temperature | |||
: 2. Resistor load box value | |||
: 3. Time required to trigger analyzer (Only for Tests 1 , | |||
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: 4. Total fiarne test time During each test the terrperature of the flame source was observed continuously along with the power supply line voltage. I I | |||
For test nutber 1 and 2, the follcming sequence 4 L.vf -l 6.6.1 Record the afblent rocm te.Toerature. l 6.6.2 Measure the resistance of the load box. | |||
6.6.3 Connect the test specimen to the power supply voltage source. | |||
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6.6.4 Check all connections of the test circuit and inputs to the analyzing recorder. | |||
' 6.6.5 Energize and adjust the analyzing recorder and 3 i | |||
check the trigger set points. | |||
6.6.6 Close the power supply breaker and measure the voltage, using the voltmeter. | |||
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6.6.7 Igalte the flame source and adjust the rotameters *i to supply 70,000 BTU's per hour. At this point the timer is started at T=0. | |||
6.6.8 Monitor the flame test and flame source temperature until the analyzing recorder triggers, f | |||
6.6.9 Record the time to trigger from the start of the | |||
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test (T=0), s 6.6.10 After the recorder is triggered, continue the test '/J for approximately 15 seconds, while data is being recorded. , f 6.6.11 Shut down the flane source and open the voltage supply circuit breaker. | |||
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For test nuTber 3 the following sequence was used: | |||
6.6.1 Record the ambient roon temperature. | |||
6.6.2 Check the test specimen connections to the transducers and data logger, j 6.6.3 Close the comnon power supply circuit breaker. | |||
9 6.6.4 Ignite the flame source and adjust the rotaneters 'I to supply 70,000 BTU's per hour. At this point the timer is started at T:0, s | |||
6.6.5 Start the data logger at T:0, 6.6.6 Monitor the flame test and flare source tanperature until, either the circuit breaker trips or the fuses fall . | |||
6.6.7 Shut dcwn the flame source, open the mitage supply circuit breaker and stop the data logger. | |||
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7.0 Test Results: | |||
7.1 Test No.1 The analyzer triggered at 10 minutes from the start of the test. The analyzer was triggered at a cable insulation resistance value of 200 obns between the energized conductors , | |||
and neutral. Eight thousand data points were recorded during the four (4) second period. Figure 6 shaas a graph of the i cable Insulation leakage resistance versus time for the recording period. The energized cable did not experience a short circuit. During the recorded period the maxirrun insulation leakage resistance between the energized conductor and neutral was 272 ohrs which occurred at 601 MS and the mininun resistance was 18.57 ohms which occurred at 3752 MS. | |||
The maximum and minimum currents recorded were 5.508 Amos and 0.416 Anos. The following is a listing of various maximum and minimum points recorded. | |||
Insulation Leakage Points Time (Milliseconds) Resistance (OH45) Current (hMPS) 1 451 168.5 0.659 2 601 272.0 0.416 3 994.5 183.8 0.614 4 110.3 214.7 0.526 5 1831.5 128.0 0.877 6 1947 165.0 0.683 7 2202 116.0 0.966 8 2468.5 201.7 0.560 9 3752 18.57 5.508 10 3834 188.2 0.599 11 3918.5 21.2 4.880 12 3994 215.7 0.524 F!gure 7 is a graph of the current through the energized conductor into the high Impedance fault as a direct result of the cable flame darege to the Insulation. The average current is 1.009 Amperes for the 4 second period. The maxinun current peak of 5.508 Amps occurs at 3752 MS. and reaches that peak from an Initial value of 2.055 Anos in 6.18 cycles. The peak then drops to 0.7310 Arps in 2.97 cycles denonstrating the transient nature of the fault resistance. | |||
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s Pictures 4 to 7 show the extensive cable Insulation damage In the lower portion of the tray which is to be expected since they were closest to the flame source. In many cases the bare conductors were exposed. The top rrest cables experienced I | |||
minor visible damage which is attributed to the non-propagating - | |||
i and flame retardant properties of the nuclear grade cable being test W. | |||
Picture 5 shows the location and conditton of the energized 4/C 912 cable. Careful Inspection of the cable in the flame g I | |||
area did not reveal bare conductor. It is therefore concluded | |||
* l that the leakage current occurred between the conductors of - | |||
the same cable. i 1 | |||
In sunmry, the test data shows that short circuit leakage current of a limited magnitude, as measured, occurs due to Ir.sulation flame damage. The leakage current is Ilmited to very low values by the high impedance of the fault and does not reach a sustained valve for the range and test period measured. Test results show there was no distinct pattern to the fluctuations in leakage current during the period, except that they were transient. | |||
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l 7.2 Test No.2 A second test was conducted using the same arrangement as test 1 to support and confinn the results. Two minor nx>difications were made. | |||
The changes fram test no.1 vere: | |||
: 1) Since the cables were randomly installed, the position of the energized cable in the cable tray flane area was different. This resulted in different times to trigger, supporting the hypothesis that cable damage is a function of position relative to the flame source. | |||
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: 2) The recording analyzer was set to trigger at 75 ohns j instead of 200 ohns. The scan rate and recording l | |||
time were Increased fran 0.5 ml111 seconds and 4000 milliseconds to 1.0 millisecond and 8000 milliseconds. | |||
The analyzer triggered at 8 minutes and 5 seconds fran the start of the test. Eight thousand data points were recorded during the eight (8) second Interval after the analyzer triggered. | |||
Figure 8 is e graph of the cable Insulation leakage resistance versus time. The energized cable did not experience a total short circuit. | |||
During the recorded period the maximtn1 Insulation leakage resistance was 4969 ohns which occurred at 6146 MS and the minimun was 21.34 ohns which occurred at 7085 MS. The maximun and mininun Insulation leakage currents were 4.893 amperes and 0.023 amperes. Although the following listing is not all inclusive it represents a large senple of maximtm and minimun points. | |||
Points Time (Milliseconds) Resistance (OHMS) Current (AMPS) 1 885 33.50 3.220 2 1449 1140.00 0.100 3 1619 68.83 1.618 4 1889 1961.00 0.058 5 2210 32.81 3.286 6 2633 2540.00 0.045 7 3249 2852.00 0.040 8 3333 71.41 1.561 9 3600 3558.00 0,032 10 3697 115.6 0.974 11 3841 4111.00 0.027 12 6786 4710.00 0.016 13 4992 146.10 0.774 14 5191 3422.00 0.033 15 5774 90.12 1.245 l | |||
16 6146 4959.00 0.023 17 7085 21.34 4.893 17 | |||
I Figure 9 ls a graph of the insulation leakage current through the energized conductor into the high irrpedance fault as a result of the cable flare damage. For the recorded duration, the average current is 0.7525 amperes for the 8 second period. | |||
The maximtm current is 4.893 amperes which occurs at 7085 MS. | |||
Pictures 8 to 10 show the cable insulation damage to cables in the lower portion of the tray, closest to the flane source. The damage is very similar to that of tost no. 1. | |||
As expected the top nest cables experienced minor visible cable insulation damage which can be attributed to the non-propagating and flame retardant properties of the nuclear j grade cables being tested. Conclusions resulting frcm the | |||
! first test were supported by this test, t | |||
7.3 Test No.3 This test was performed with the same tray, cable and flame source configuration as the first two (2) tests. Eight (8) cables were energized and each was separately fus.ed as shown in Figure No. 10. The current through each fuse was monitored as well as the total current through the supply circuit breuker. Other non-energized cables in the tray were connected to neutral. | |||
The test was stopped after 15 minutes due to excessive smoke in the rocm. At that time six (6) of the eight (8) circuit fuses had failed thereby' clearing short circuits on the Individual energized cable to which they were connected. | |||
Pictures 13 to 18 show the cable danage in the fire area. As in the first two tests, the cables in the bottom of the tray had much more danage than the cables at the top. | |||
The cables were carefully renoved frcm the tray and darcage in the fire area was photographed for each separate cable. The relative position of the cable in the fire area was noted along with the channel nunber, cable type, fuse size and type, time until fuse failed and failure sequence. This information is shown in Figure No. 14. | |||
Fuses associated with cables on Channel 13 and 18 did not fall. Figure 14 shows that these cables were located in the top most part of the tray. The cable damage to these circuits is shcm in Pictures No. 25 and 26. All energized cables located in the bottom and middle sections of the tray blew their fuses and sustained major cable flane damage as can be ; | |||
seen in Pictures 19 to 24. I 18 | |||
The results of test ntnber 3 confinn the results of the first two tests and also conclude: | |||
: 1) The occurrerce of cable faults in a connon tray are not s imul taneous. Cables nearest the flame source develop flane danage related short circuits before cables further away. As a result, with the exception of cables 11 and 16 no simultaneous faults occurred during the test. Faults occurred simultaneously on cables 11 and 16 which were side by side in the bottan of the cable tray closest to the flame source as can be seen In Figur e No.14 "Cable Location In Flane Area Vs. Tine To Blow Fuse". | |||
: 2) The cable fault short circuit characteristic has a high Impedance period followed by a transition to low Irtpe-dance, which results in fault clearing. During the high impedance perloa the current is limited to very low values which dre not effect electrical coordination. As shown in the table below the longest short circuit high Invedance period was 54 seconds for cable 16. During this period t1e recorded current was limited to a maxirrun valve of 1.901 anpers by the Impedance of the fault in cable 16. | |||
Transient Start of Fuse Fault Maximum Leakage Melt Duration Leakage Current Clearing (Sec.) Current Chan. From T:0 Time Untti Recorded tb. Fuse (Sec's.) (Sec.) Clearing (AMP) 10 10A, KTK 428 477 49 5.136 14 10A, KTK 535 Sh6 11 0.540 15 10A, KTK 559 609 50 5.260 11 10A, KTK 601 651 50 9.310 16 30A, KTK 624 678 54 1.901 12 10A, KTK 679 687 8 4.758 For the cmmon bus configuration tested, the bus supply circuit breaker did not trip. The breaker is a Westinghouse, 120VAC Type EB, 30 amperes rated with thermal and magnetic trip elements. The maxinun recorded current through the breaker was 14.56 artperes. While the 14.56 artperes peak value transient occurred for less than 1 second, the breaker trip requiranent for this short time period is on the order of 220 anperes. | |||
Alternatively, the average current for the longest high impedance fault period of 54 seconds was 2.256 arrperes which included fault current fran cables 11 and 16. The sustained current required to trip the circuit breaker for a 54 second time period is 50 arperes. | |||
l 19 | |||
l As can be seen from Figure No. 12 "Total Supply Breaker Current Vs. Time During Flame Test" the circuit breaker was l not in Jeopardy of tripping due to cable fault high | |||
; Impedance short circuit currents. The current through the I supply breaker was a ccrbination of the fault current contributions frcm each of the energized cables. | |||
l l | |||
As shown in Figure No.13 "Load Supply Fuse Current Vs. Time During Flame Test", the short circuit characteristic of each l cable fault was similar. A high Impedance fault period l followed by a transition to low Invedance and then fuse fault clearing. The fuses used were type KTK, non-tInn delay fast acting which provided high speed of response above the 1000 second rating of the fuses. Under z!! cases i < | |||
the high impedance short circuit peak current recorded was I | |||
below the lowest fuse rating of 10 arrperes. At the transition to low Impedance the fuse failed Inmediately. The transition to low Inpedance was caused by conductor to conductor contact. | |||
o N | |||
e5 1 | |||
w --- | |||
20 | |||
l Section 8.0 Figures Flqure No. Title Page 1 Test No.1,2 and 3 22 | |||
, Cable Tray And Flane Burner Arrangenent l 2 Test No.1,2 and 3 23 l Flane Source Connections 70,000 BTV's Per Hour 3 Test No. I and 2 24 Circuit Connections 4 Test No. 1 and 2 25 Cable Installation At Flare Area 5 Test tb. I and 2 26 Analyzing Recorder Program 6 Test No. 1 27 Cable Insulation Leakage Resistance Vs. Time (After Trigger) 7 Test No. 1 28 Cable Insulation Leakage Current Vs. Tine (After Trigger) 8 Test No. 2 29 Cable Insulation Leakage Resistance Vs. Tire (After Trigger) 9 Test No. 2 30 | |||
. le inculation Leakage Current Vs. Tine (After Trigger) 10 Test No. 3 31 Circuit Connections 11 Test No. 3. 32 l Data Logger Interface 12 Test No. 3 33 Total Supply Breaker Current Vs. Time 13 Test No. 3 34 Load Supply Fuse Current Vs. Time During Flame Test 14 Test No. 3 35 Cable Location in Flame Area Vs. Time to Blow Fuse 21 | |||
FLAME AREA 4, 0" ' I l l 1 6"WIDESTEdLCdBLETRAY 3" | |||
@l i 3" T TEEL CHANNEL g SUPPORTS METAL SUPPORTS -* ,,,,,,, | |||
INSULATED FROM 70,000 BTV/ HOUR GROUND (TYPICAL) | |||
FLAME SOURCE | |||
@ INDICATES LOCATION OF FLAME SOURCE THERM 0 COUPLE NOTES 1.0 BURNER FACE IS 3" FROM BOTTOM OF HORIZONTAL TRAY. | |||
2.0 BURNER LOCATED S0 THAT FLAME IMPINGES ON BOTTOM LAYER OF CABLES MIDWAY BETWEEN TRAY RUNGS. | |||
3.0 THERM 0 COUPLE LOCATED IN FLAME, CLOSE TO BUT NOT TOUCHING CABLES. | |||
1 FIGURE NO. 1 TEST NO. 1 , 2 , AND 3 CABLE TRAY AND FLAME BURNER ARRANGEMENT 22 | |||
CONTROL VENTILATED EXHAUST ROOM TEST ROOM I | |||
CABLE TRAY SUPPLY AIR - - TEST SPECIMEN pt ' biaVA (FROM LAB) ) | |||
70,000 BTU /HR BURNER 2 / | |||
F1 h | |||
COMMERCIAL GRADE PROPANE 20LB TANK ITEM NO. DESCRIPTION | |||
@ ROTAMETER FOR SUPPLY AIRFLOW, SET AT 163 10 SCFH | |||
@ ROTAMETER FOR FUEL INPUT RATE, SET AT 70,0002 1600 BTU PER HOUR | |||
@ AIR-GAS VENTURI MIXER, MFGRD. BY AMERICAN GAS FURNITURE C0., | |||
CAT NO 14-18 (2 LB /IN2 MAX GAUGE PRESS.) | |||
@ RIBBON BURNER, MFGRD BY AMERICAN GAS C0., 10", CAT. NO. 1614 FIGURE NO 2 TEST NO. 1, 2, AND 3 FLAME SOURCE CONNECTIONS l 70,000 BTV'S PER HOUR l | |||
23 | |||
ENDS OF LOOPED ENERGlZED CABLE (4/C #12) | |||
(TYP) | |||
RESISTIVE " ] | |||
* CABLE TRAY LOAD BOX u' - | |||
n , LINE TEST LAB 10K ;! | |||
<- 4400 400 4,00\_ | |||
\ CONNECTION TO WHITE & GREEN | |||
' f CONNECTION POWER yy 10g;! CONDUCTORS TO | |||
~ | |||
SUPPLY RED 8 BLACK 10K ji CONDUCTORS | |||
,, NEUTRAL e ^ | |||
l D A B C CHANNEL INPUTS B + C USED FOR CALCULATION FUNCTION ANALYZ 4G RECORDER NOTES: | |||
1.0 FIXED RESISTOR VOLTAGE DIVIDERS USED TO~ REDUCE VOLTAGE INPUT TO RECORDER. | |||
2.0 ALL CONDUCTORS OF UNENERGlZED CABLES ARE TIED TO NEUTRAL l | |||
3.0 TEST LAB POWER SUPPLY WAS NOMINAL 115VAC WITH A 50 AMPERE CAPACITY FIGURE NO. 3 TEST NO 1 AND 2 CIRCUIT CONNECTIONS 24 | |||
"W ENERGlZED CABLE 3" | |||
u | |||
< 6" | |||
* 2/C #10 (CODE 125-09516) 4/C #12 (CODE 125-09512) | |||
O 1/C #12 (C0DE 125-09508) 1 NOTE: | |||
1.0 g RANDOMLY INSTALLED IN THE TRAY TO SIMULATE FIELD AR hN HE SDEbF HE'TR Y 3.0 PER CENT TRAY FILL IS 28,57.. | |||
FIGURE NO. 4 TEST NO. 1 AND 2 CABLE INSTALLATION AT FLAME AREA 25 | |||
1 I | |||
MODEL 3655 LIST I | |||
l MODE: MEMORY l | |||
SAMPLE RATE: 1.00 ms (Test 2) 0.50 ms (Test 1) | |||
**** SET RANGE **** | |||
CH. INPUT RANGE FILTER A AC 60V 0FF B 0FF C 0FF l D AC 60V 0FF | |||
**** SET TRIGGER **** | |||
TRIGGER LEVEL : 6% (Test 2) 2% (Test 1) | |||
TRIGGER SOURCE : A TRIGGER SLOPE : POS PRE TRIGGER : 10% | |||
SAMPLE CLOCK : INT i I !- | |||
**** SET PR0 GRAM **** | |||
PROGRAM : ON 1 UNIT LOW HIGH Y1 = H'(SQR(MEAN(A*A))) SV 0.000 180.0 Y2 = (H'(SQR(MEAN(A*A))))/F 1 0.000 60.00 Y3 = (G/((H'(SQR(MEAN(A*A))))/F))-F R 0.000 300(Test 1) 3000 (Test 2) | |||
Y4 = 1*(SQR(MEAN(D*D))) LV 0.000 180.0 2.165 (Test 1) | |||
F = 2.120 (Test 2) G = 114.8 H = 3.010 1 = 2.994 J = 0.000 , | |||
K = 0.000 L = 0.000 M = 0.000 N = 0.000 0 = 0.000 ; | |||
P = 0.000 0 = 0.000 R = 0.000 S = 0.000 T = 0.000 l | |||
1 | |||
**** SET DISPLAY FORMAT **** ' | |||
DISPLAY MODE: SINGLE l 1: Y1 - SHUNT VOLTAGE l 2: Y2 - LEAKAGE CURRENT 3: Y3 - LEAKAGE RESISTANCE 4: Y4 - LINE VOLTAGE FIGURE N0. 5 TEST NO. 1 AND 2 ANALYZING RECORDER PROGRAM 26 ' | |||
300 I | |||
_ 225 - | |||
E @ | |||
9 @ | |||
U @ @ , | |||
\ '. | |||
5 O d/ | |||
y150 - | |||
E \ | |||
u @ | |||
s @ | |||
S 75 - | |||
h i , , , , @@ | |||
0.0 4000.0ms TIME AFTER TRIGGER OF RECORDER (MILLISECONDS) | |||
SCAN RATE: 0.5 MILLISECONDS TRIGGER TIME: 10 MINUTES | |||
@ - EXTREME POINTS, SEE REPORT SECTION 7.1 FOR VALUES FIGURE N0. 6 TEST NO. 1 CABLE INSULATION LEAKAGE RESISTANCE VS. TIME (AFTER TRIGGER) 27 | |||
10 7.5 - | |||
^ | |||
E' !.88A x | |||
5 5.508 s N 5 | |||
E 5 - | |||
S P J | |||
& I s | |||
O a | |||
4 2.5 - | |||
d .I l | |||
-%-_ - s I i I i 0.0 4000.0ms TIME AFTER TRIGGER OF RECORDER (MILLISECONDS) | |||
SCAN RATE: 0.5 MILLISECONDS ! | |||
TRIGGER TIME: l 10 MINUTES ! | |||
l FIGURE No. 7 TEST NO, 1 CABLE INSULATION LEAKAGE CURRENT VS. TIME (AFTER TRIGGER ) | |||
28 | |||
l l | |||
3000 bb OO @ | |||
) 1 t | |||
I g 2250 - | |||
l @ ! | |||
d / ! l ; | |||
5 : | |||
G G 1500 - | |||
U \ ' | |||
1 g @ | |||
4 \ r I ' | |||
s ' | |||
750 - , | |||
\ , l , | |||
i | |||
) - | |||
\ y f l J 1 1 . | |||
i h ,@ -@ , | |||
0 @ h 8000ms l | |||
TIME AFTER TRIGGER OF RECORDER (MILLISECONDS) | |||
SCAN RATE: 1.0 MILLISECONDS TRIGGER TIME: 8 MINUTES 5 SECONDS | |||
@ - EXTREME POINTS, SEE REPORT SECTION 7.2 FOR VALUES 1 | |||
FIGURE NO. 8 l TEST N0, 2 j CABLE INSULATION LEAKAGE RESISTANCE VS. TIME (AFTER TRIGGER) l 29 1 | |||
l 10 l | |||
l 1 | |||
l l | |||
7,5 - | |||
G l E | |||
5 | |||
~ 1 4.893A | |||
$ 5.0 - : | |||
" k i | |||
w 3,22A 3,286A 1 ' | |||
$ [t 2,5 - - | |||
4 h Ji F g | |||
0 1 \ l' W 0 8000ms l | |||
TIME AFTER TRIGGER OF RECORDER (MILLISECONDS) | |||
SCAN RATE: 1.0 MILLISECOND TRIGGER TIME: 8 MINUTES 5 SECONDS FIGURE N0, 9 TEST N0, 2 CABLE INSULATION LEAKAGE CURRENT VS, TIME (AFTER TRIGGER) 30 i | |||
i | |||
UNE c | |||
Jb o o)EB-30(TYPEEB1030) s CLAMP ON AMMETER | |||
(/ | |||
(T0 DATA LOGGER) b i | |||
5; 5 | |||
55 104 ica 104 104 104 toA 7:a soA e [xix [<tc [xic [ xix [xix [ cic [ (ir, [ran | |||
* MU a | |||
h b5 3E b5 )[ 3( )[ b(I )[ (4T0TRANSDUCE DATA LOGGER) h ! _!_ _i _i l _! _s _i | |||
* CONDUCTORS | |||
$ m n m n6m n n n | |||
~ | |||
v v v v V, v v v v 4-- CABLES Igl Igl Igl a sie Igl Igl is lll l%l l%l ll [!! I$ llill l!l l l%l 4- FLAME AREA O O O ^ | |||
v v ss s] @ O sJ O | |||
v [> ss + CABLE TRAY l l | |||
l | |||
= = = x l V j j = g j j g y 4- -CONDUCTORS C | |||
NOTES: | |||
1.0 5 - | |||
IND'O TES 5 AMPERE TRANSDUCER TO DATA LOGGER NUMBER INDICATES CHANNEL INPUT, FIGURE N0. 10 TEST NO. 3 CIRCUIT CONNECTION 31 | |||
TEST f T SPECIMEN < : ; | |||
CABLES '. f | |||
~ ~ | |||
SEE FIG. 10 $ | |||
CLAMP ON AMMETER d' d' d' J' J' J' J' JL 10 Il 14 15 12 13 16 18 y 3 y -- -- | |||
5 - INDICATES CHANNEL N0, SCAN RATE = 10 CHANNELS /SEC, K 8OB ' | |||
f lill E $ | |||
sw m_ | |||
RS232 TO PC DIRECTLY ONTO FLOOPY DISC IBM : | |||
e il L RE m . | |||
DATA CAN BE PRINTED AS TEXT OR PLOTTED FIGURE NO. 11 TEST N0 3 DATA LOGGER INTERFACE 32 | |||
15 | |||
~ ' | |||
EB-30 SUPPLY CIRCUIT 33 _ TOTAL CURR[ | |||
DURINGFLAME 12 - - | |||
11 ; | |||
10 - | |||
en L | |||
9 _ | |||
2 8 - | |||
7 - | |||
6 - | |||
5 - | |||
l r | |||
4 Y b]f | |||
' ' ' ' ' 'l 3 | |||
400, 440, 480 520) 1 d | |||
l SCAN RATE - ONCE PER SECOND . | |||
NOTE: TIME SCALE IS SECONDS AFTER START OF FLAME SOURCE.' I l . | |||
? | |||
TOTAL SUPPL 7 DU@ | |||
33: j | |||
- ~ | |||
._..-_,_._,.I | |||
@REAKER , , | |||
ENT 'n .. | |||
,T APERTURE CAllD i Also Available On | |||
. Apertue Card l | |||
\ | |||
A n= J A / % . | |||
w l t ! I t i I I t j 560 600 640 080, lECONDSj - | |||
TGURE NO 12 TEST N0 3 , | |||
ppg (,A/005~2'o/ | |||
BREAKER CURRENT VS.TIMEi ING FLAME TEST! . | |||
10 fasI 10 AMP,KTK, LIMIT @ | |||
CH 10 CH 11 -.10 AMP,KTK, LIMIT % | |||
10 AMP,KTK,LIMITd CH 12 8 - | |||
CH 14 10 AMP,KTK,LIMITf CH 15 10 AMP,KTK, LIMIT-7 - | |||
CH 16 30 AMP,KTK, LIMIT-CH 13 10 AMP, KTK, LIR 6 - CH 18 30 AMP,FRff,FUSETF w 5 - | |||
c i 2 | |||
< 4 - | |||
3 - | |||
2 - | |||
i CH 10 CH 1 | |||
g I / | |||
0 ' ' ' ' ' ' | |||
400 440 480 520. | |||
5 SCAN RATE: ONCEPERSECOND'j NOTE: 1.0 TIME SCALE IS SECONDS AFJER START OF FLAME SOURCE 2.0 NO LEAKAGE CURPENT RECORDED FOR CHANNELS 13 a 18 pi LOAD SUPPLY | |||
.s -, DLR1 A, . | |||
p t | |||
3N JN 71 DN i 4pgg7ggg DN l l CARD lI ON tll , | |||
I 1 Also Available Ou ON I | |||
g Aperture & J - | |||
ITRON CH 11 ll 8 l I 'j g' I I l CH 15 : | |||
l l I i 1 % | |||
lIl Il l CH 12 | |||
- 1I Il I | |||
I | |||
' s' I i' 11 i | |||
8 lli CH 16 i l,1ll 1 I i IN l gl / | |||
' 5 | |||
;V i i 4 i'43a' ! u i u i ! | |||
560 600 640 680j | |||
: SECONDS, | |||
~ | |||
f[(d(spf6oS2-ob. | |||
TEST N0 3 ; . | |||
FUSECURRENTVSTIME! | |||
NG FLAME TEST' - | |||
18 3 l | |||
l TOP 13 13 MIDDLE 15 14 3" f __ _ __ | |||
14 15 l 10 ll 12 1 4 6" 5 FROM START OF FLAME CHANNEL # CABLE TYPE FUSE TIME TO BLOW FUSE (SEC) FAILURE SEQUENCE 10 4/C #12 10A, KTK 477 1 14 2/C #10 10A, KTK 544 2 15 2/C #10 10A, KTK 609 3 11 4/C #12 10A, KTK 652 4 16 2/C #10 30A, KTK 679 5 12 4/C #12 10A, KTK 688 6 l 13 4/C #12 10A, KTK DID NOT BLOW NO FAILURE 18 2/C #10 30A, FRN DID NOT BLOW NO FAILURE NOTE: | |||
10' - INDICATES ENERGlZED CABLE AND DATA LOGGER CHANNEL NO. INPUT 1 | |||
l l - INDICATES UNENERGlZED CABLE, ALL CONDUCTORS AND TRAY l CONNECTED TO NEUTRAL. | |||
l FIGURE NO. 14 TEST NO. 3 CABLE LOCATION IN FLAME AREA VS. TIME TO BLOW FUSE 35 | |||
1 i | |||
Section 9.0 Pictures Picture No. Title g 1 Test No. 1 and 2 38 : | |||
Control Room Instrurentation Rotameters, Lead Box, Analyzing Recorder 2 Test tb. I and 2 39 , | |||
Yew Model 3655 Analyzing Recorder l 3 Test tb. I and 2 40 Flame Source, Cable Tray and Cable Connections 4 Test tb. 1 41 Cable Damage 5 Test t!o.1 42 Cable Damage, Burner and Thernocouple Wirs , | |||
1 1 6 Test f4o. 1 43 Cable Damage, Burner and Thermocouple Wire i | |||
7 Test tb. 1 44 Cable Damage S Test tb. 2 45 Cable Damage 9 Test tb. 2 46 Cable Danage 10 Test tb. 2 47 Cable Damage 11 Test tb. 3 48 l Circuit Breaker, Fuses, Transducers l And Fluke Data Logger ! | |||
12 Test No. 3 49 Electrical Cable Connections At Cable Tray i 13 Test tb. 3 50 Cable Damage in Flame Area Top of Tray l | |||
14 Test tb. 3 51 Cable Damage 15 Test No. 3 52 i | |||
: Cable Damage and Burner l 36 l | |||
. . _ _ - . - - . , ,. ,_ - . _ _ , , , _ _-___r._.-,___.-- ~ - - ., | |||
l t | |||
Pleture No. (Cont'd) Title (Cont'd) Page | |||
-16 Test No. 3 53 Cable Damage and Burner 17 Test No. 3 54 Cable Damege 18 Test No. 3 55 Cable Damage, Burner and Melted Conductor 19 Test No. 3 56 , | |||
Channel #10 Cable 20 Test No. 3 57 : | |||
Channel #14 Cable ! | |||
21 Test No. 3 58 . | |||
Channel #15 Cable , | |||
l 22 Test No. 3 59 , | |||
Channel #11 Cable l | |||
\ | |||
23 Test No. 3 60 l Channel #16 Cable 1 l | |||
l 24 Test No. 3 61 Channel #12 Cable 25 Test No. 3 62 Channel #13 Cable j 26 Test No. 3 63 Channel #18 Cable l | |||
37 ; | |||
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Section 10.0 List of References | |||
: 1. IEEE Standard 383-1974, "IEEE Standard for Type Test of Class IE Electric Cables, Field Spilces, and Connections for Nuclear Power Generating Stations". | |||
: 2. USNRC Gener ic Letter 86-10 (April 24,1986) "Inplernentation of Fire Protection Requirements". | |||
: 3. PBAPS 10CFR50, Appendix R Electrical Coordination Study (August, 1986). | |||
4 USNRC Regulatory Guide 1.131, "Oualification Tests of Electric Cables and Fleid Sp1 Ices for Light - Water - Cooled Nuclear Pcwer Plants", issued for Ccmnents August 1977. | |||
RBR/ss/05208801 64 | |||
Section 11.0 List of Data Acc.uisition Instrtsnents 1 | |||
Model No. ID No. Range Accuracy Cal. Expire Equipment Manufacturer 1 | |||
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Air-Gas American 14-18 - | |||
216/1N2 - - | |||
Gas Co. Max. Guage Press Venturi Mixer American 1614 - 10" - - | |||
Ribbon u Burner Gas Co. | |||
YEW 3655 38-0078 See Analyzing 5-4-88 Manual 1 0.25% FS Recorder 2190A 52-2086 See | |||
; Digital Fluke 2-16-88 Manual 1 0.25% FS Thennameter 8060A 57-5946 See 1 0.5% 6-15-88 , | |||
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Section 11.0 List of Data Acquisition Instrunents Equipment Manufacturer Model No. ID No. Range Accuracy Cal. Expire Megger Biddle - | |||
32-1953 50,000 MEG 0HM ? 1 Div. 11-8-87 Digital Tong Hioki 3206 01-0131 See Manuab See Manual 2-25-88 ; | |||
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2190A 52-2086 See Manual i 0.25 F 2-16-88 | |||
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Latest revision as of 03:15, 17 December 2020
| ML20155J845 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/27/1988 |
| From: | Boyer W, Rosalyn Jones, Rock R PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML20155J843 | List: |
| References | |
| NUDOCS 8806210052 | |
| Download: ML20155J845 (72) | |
Text
{{#Wiki_filter:_ _ _ - - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ APPENDIX R MULTIPLE HIGH IMPEDANCE CABLE FAULT FLAME TEST REPORT MAY 27, 1988 PREPARED BY PHILADELPHIA ELECTRIC COMPANY PHILADELPHIA, PA. 19101 NUCLEAR ENGINEERING DEPAR~ MENT ENGINEERING DIVISION N2-1, 2301 f%RKET STREET PREPARED BY: -I) #-2 7- //
- 4. B. fock, Electrical Engineer Power Distribution Configuration Branch REVIEWED BY: \m, S 'D ' %
R.M.dones( Acting Branch Head f Power DistrN>ution Configuration Branch l APPROVED BY: , W.d.pfer,Mgager ' / Engineering Services Section l APPROVED SY: d b W T[ J. 'm(rke II, Branch Ehginedr 7 te als Laboratory
'3 sting and Laboratories Division ,
8806210052 880615 '. 1 PDR ADOCK 05000277 -
, l
$ DCD ;
Page i Revision Record Revision Page Section Description Date 0 All All First Issue May 27, 1988 l l l I l i Approvals Revision Date Prepared By Reviewed By Approved By
i Page Ii Table of Contents Section Title Pm 1.0 Objective 1 2.0 SuTmary 2 3.0 Conclusions 3 4.0 Introduction 4 5.0 Test Simulation 6 5.1 Flame Source 6 5.2 Cable and Cable Tray 6 5.3 Test Circuit 8 5.3.1 Test No. 1 8 5.3.2 Test No. 2 8 5.3.3 Tost No. 3 8 6.0 Test Procedure 10 6.1 Flame Source Preparation 10 6.2 Cable Tray Preparation 11 6.3 Test Rocm Preparation 11 6.4 Power Supply 12 6.5 Test Circuit Connection 12 6.6 Test Sequence 13 7.0 Test Results 15 7.1 Test No I 15 7.2 Test No. 2 17 7.3 Test No. 3 18 8.0 Figures 21 9.0 Pictures 36 10.0 List of References 64 11.0 List of Data Acquisition Instrunents 65
Pags ill a NOTE Utilization of this test report by persons without access to pertinent factors, and without proper regard for their purpose could lead to erroneous conclusions. Philadelphia Electric Comany cannot asstme responsibility for the use of this report not under Its direct control. PHILADELPHIA ELECTRIC COMPANY 2301 Market Street Philadelphia, PA 19101
1.0 Objective This test report presents the test results of three separate energized cable flame tests. The tests were performed to: (1) determine the characteristics of fire induced cable insulation failures as they relate to leakage current through Insulation degraded by fire, (2) determine the effect on a ccmnon power supply where multiple Individually fused cables are Installed in a manner simulating typical power plant practice and are subjected to a fire source. The results will be used to consider the effects of fire related simultaneous high impedance faults in compilance with 10CFR50, Appendix R. l I l 1 __ _. _ . . _ _ . ~ . _ - - .
l i 1
- 1 l l l- 2.0 Strivna ry Generic Letter 86-10 "Irrelementation of Fire Protection Requi rements" (Apri l 2f+, 1986), Enclosure 2 Itan 5.3.8 requires <
consideration of simultaneous high Impedance faults for all conTnon bus associated cables located in a fire area. A series of energized cable flame tests were conducted in order i to address the concerns identified In the generic letter. The tests I Included a simulated 120 VAC distribution panel arrangement with l coordinated supply circuit breaker and fused load circuits. The results of this test will be used to consider simultaneous high Impedance faults for spect fic cormen bus arrangements. This report describes the test specimen selection, the test set-up and procedure and presents the test results and conclusions. 1 2
l 3.0 conclusions The cable flame tests reported upon herein were conducted by Philadelphia Electric Conpany to provide data which supports the premise that simultaneous high impedance faults from fire damage do not occur in a menner such that electrical coordination of power sources (as designed for PECo nuclear facilities) is Jeopard i zed. The test results confirm the pranise as stated. Supporting evidence from Tests 1 and 2 includes the following:
- 1. The time to failure varies randomly within ranges which are dependent on proximity to flame source and nunber of Intervening cables between a subject cable and the flane source.
- 2. The failure mode consists of an Initial period of transient insulation breakdown which is very current Ilmited as opposed to approaching the trip threshold of fuse or breaker sizes used in power distribution panels.
- 3. The insulation resistance or alternatively the leakage current during the initial Insulation breakdown transient has a wavefonn with alternating peaks and ,
valleys, j 4 The period of Initial transient high impedance Insulation breakdoan is generally enveloped within a 1 minute duration. In addition to fully supporting the results of Tests 1 & 2, l Test 3 provides the folloaing:
- 5. Failure of Insulation after the Initial transient breakdown, cascades to a very Icw insulation Impedance within less than 1 second.
- 6. The electrical protection device actuation will be i principally influenced by the high current during the l cascading insulation breakdown as opposed to the lower ,
Initial transient leakage current. The fault during the l cascading Insulation breakdown is less than 1 second in l duration. l 1 1 l l 3 l l
4.0 Introduction The PBAPS Safe and Alternative Shutdown System Analysis evaluated each plant fire area to determine the affectr of an
. Appendix R fire on the ability to achieve safe shutdown. For analysis, fire damage to electrical power, control and Instrunentation cables was defined as short, ground, optsn or hot short circuits. Associated circuits (safe shutdown or non-safe shutdown) were considered those i.e. circuits that have a conmon power source or comon enclosure with the active safe shutdown equipment.
A 10CFR50, Appendix R Electrical Coordination St0dy was performed for PBAPS safe shutdown electrical buses frcrn 4.16KV to 120VAC and including the 125/250 VDC System. The coordination study detennined that the existing design is coordinated and that faults on associated circuits due to flame damage, of the type analyzed, are not a concern. Also, fault current available at all distribution levels is adequate for the proper operation of the current actuated protective devices. In 1986 the NRC Issued Generic Letter 86-10 (April 24, 1986) "Inplementation of Fire Protection Requirements". Enclosure 2 of this letter provided NRC responses to questions raised by the Industry during a series of NRC Regicnal , Workshops. Question 5.3.8" Short Circuit Coordination I Studies," asked If high Impedance faults should be considered
- l in the coordination studies. The NRC response requires l that simultaneous high Impedance faults (below the trip point (
for the breaker of each Individual circult) for all associated j circuits Iccated in the fire area, should be considered in i the evaluation of the safe shutdown capability. During the NRC review meeting on PBAPS Appendix R held, July 30, 1987, PECo responded to questions regarding nultiple high Impedance faults stating that the prospect that they j occur on associated circuits In a fire area is very low i because the raceway system is solidly grounded and nuclear grade cable is used. A subsequent review of NUREG-0050 and 0061 associated with the Browns Ferry Fire was conducted. The fire damage resulting to cables Installed in cable tray and conduit was reported to be caused by flame and tecperature. The loss of control circuit function associated with these cables was reportedly due to short circuits. Evidence of high Incedance faults or tripping of related upstream protective device trips was not found in these reports. 4
1 l Nuclear Industry cable suppliers were contacted as well l as PECo cable test experts to gain insights related to their experience with failure nodes of cable during flane testing. Significant flane testing to IEEE 383-1974 has been perforned on 600 Volt multiconductor nuclear grade cables. The l acceptance criteria used in these tests has been: (1) time to short circuit, (2) flane propagation and (3) char distance. Testing was conducted on energized cables using Indicating lights to signal when conductor to conductor or conductor to ground Insulation breakdown occurred. This test report presents the results of three separate
- flane tests on energized cables, the purpose of which was to I
collect data on high Impedance faults. The tests were perforned using high speed recording analyzers and data loggers to measure transient changes In cable Insulation resistance and leakage current at tine Intervals as low as 0.5 milliseconds. The first two tests were conducted on a 120 VAC energized multiconductor power cable circuit. Insulation leakage current resulting from flane danage was neasured using a high speed recording analyzer. The recorder was autocatically triggered at a low insulation resistance value. The third test was run using a coordinated 120 VAC circuit breaker and fuse arrangenent. Current through each fuse was neasured using transducers and recorded by an IBM-PC and data logger. These tests were not tenminated until a tine after the energized cables developed short circuits, in order to verify coordination. In considering typical poner plant voltage levels, testing was perforced at 120VAC because 120VAC buses are the nore nunerous, share more of the associated cable loads and are considered nore susceptible to high Impedance faults. Testing at 120VAC is conservative since at higher voltages, additional voltage stress adds to cable flane danege and ; cable short circulting. Protective device clearing levels l will occur quicker than at lower voltage levels. ) i ! I l 5 l
l l l l 5.0 Test simulation Testing was perfonned in the PECo test laboratories. A roon In the Material Testing Laboratory measuring 19.5 X 10.5 X 12 feet with a glass observation window was used. The room was ventilated by means of two exhaust hoods, used to clear the stroke and furnes produced from the flame test. The cable, cable tray and the flame source were located in the test rocm. Electrical connections to the cables, gas pipir.g to the burner and other Instrunentation were routed outside the room through sealed penetrations. 5.1 Flame Source A 70,000 BTU per hour ribbon gas burner using commercial grade propane as the fuel was used fcr the flame. The flame source and set-up met the requirements of IEEE 383-1974, Section 2.5 Flame Test, and Regulatory Guide 1.131, Issued for conTnent August 1977. This arrangement was chosen since It represents a rectgnized Industry standard a-d the flame test is repeatable. Ccmnercial grade propane and air were premixed using a venturl mixer and supplied to the gas burner. The propane flow rate corresponded to a heat Input rate of approximately 70,000 1 1600 BTU per hour based on the gross heating value of propane, and the supply airflow of 163 2 10 standard cubic feet per hour. Flow rates were nonitored using two callbrated rotameters. The set-up foi the flame source is shown in Figures 1 and 2. 5.2 Cable and Cable Tray The cable and cable tray arrangement was set up to sinulate fleid installed conditions and facilitate the testing within the confines of the test facility. A horizontal tray configuration was used. It was loaded with single and multiconductor cables tyrically used in 120VAC power and control circults. The test tray used was open ladder steel construction, 4 foot long, 6 inches wide and with 3 Inch sideralls. The single and multiconductor cables were Installed in a loop with both ends exiting the same end of the tray to facilitate electrical connections. The percent fill of cable tray was 28.5%. The cable Installation approximated three (3) levels of cables In the tray (bottenHniddle-top), as i shown in Figures 4 and Picture 3. 6 l _ _ _ _ _ _ _ _
The cables used in the test were procured under PECo Specification 125-P-7 for PBAPS. The cables were obtained from PECo stores by material code nurber. The followim cables were used: PECo Materlai Code Manufacturer Description 125-09508 Brand-REX 1/C #12, Copper conductor, 600 Volt cross-linked polyethylene Insulation. 125-09512 Rockbestos 4/C #12, Copper Conductor, 600 Volt cross-linked polyethylene insulation with an overall black flame retardant neoprene. 125-09516 Brand-REX 2/C #10, Copper Conductor, 600 Volt cross-linked polyethylene Insulation with an overall black flaan retardant neoprene. Each flane test was conducted using randomly looped lengths of the above cable Installed per Section 6.2. The following Is a sunnery of the numbers and types of cables used in each test: 12-Cables - 2/C M10 (Code 125-09516) 12-Cables - 4/C #12 (Code 125-09512) 6 -Cables - 1/C N12 (Code 125-09508) 7
The cables have the following construction: Conductors Thickness-MILS 0.D. Inches Code No No. KCMIL(AWG) Strands insulation Jacket Min. Max. 125-09508 1 12 7 30 None 0.152 0.167 125-09512 4 12 7 30 45 0.475 0.522 125-09516 2 10 7 30 45 0.460 0.506 5.3 Test circuit 5.3.1 Test-No.1 A recording analyzer measured the voltage across a resistance load box which was proportional to the ieakage current caused by insulation flame damage to a 4/C 1612 energized cable test specimen located in the cable tray. Two (2) conductors of the test specimen were electrically connected together and tied to the line side of the power supply through the resistive load box as shown in Figure 3. All other cable conductors in the tray were electrically connected to the steel tray which was tied to the neutral side of the power supply. The steel tray and supports were isolated frcm ground. With the circuit energized in the initial condition prior to applying the flame source, there was no current ficw in the circuit. The current path due to cable Insulation degradation would be frcm the energized conductors across the insulation to a neutral conriected conductor or to the cable tray. This current would be a direct result of the cable / conductor insulation flame damage and leakag:: current. Pictures 1, 2 and 3 show the test set-up and instrunentation. A 120VAC test lab pcwer supply, capable of providing 50 amperes, was connected through a supply circuit breaker to the test set-up. Since there was no load current on the energized cable, the measured current was purely leakagc. The recording function of the analyzer was autcmatically triggered when the leakage resistance dropped to (reached) 200 ohns. The trigger had a 400 millisecond (ms) preset, so that 400 ms of data prior to trigger was recorded. The recorder took sample readings each 0.5 millisecond for a 4 second period (or 8000 data points). Each sample data point consisted of a reading of the power supply voltage and the voltage across the fixed resistance 8
Ioad box. Using these values, the analyzer was set-up to calculate the leakage resistance and leakage current. Figure 5 shows the range, trigger and program used by the recording analyzer for these calculations.
. The data is displayed in graph form or dt.gitized in tabular form. A permanent hard copy of the digitized data was made for docunentation retrieval .
5.3.2 Test No.2 The test set-up and methodologies were the same as for test No,' meept the recording analyzer was triggered at 'ms of Insulation leakage resistance Instead of 200 otins. Also the recording time was increased frcm 4000 milliseconds to 8000 milliseconds. Data points were measured and recorded each millisecond. This second test was performed to confirm the results and repeatability of the first test. 5.3.3 Teac No.3 This test was conducted using the same flame source and cable tray arrangements as the first two tests. Eight (8) circuits representing 66% of the cables were energized at 120VAC and fault current was monitored durIng the entire duratton of the test as shown in Figures 10 and 11. Power for each circuit was supplied through Individual fuses which were fed frcm a ccrmen circuit breaker simulating a coordinated ccxmen bus arrangement. The flame test was run until after either the breaker tripped or the fuses blew, in order to test for high inpedance fault effects on electrical coordination. The following circuit breakers and fuses were obtained frcm the PBAPS Storeroom for use in the test: Type Manufacturer DeserIptIon Circuit Breaker Westinghouse Type EB, TM 30A @l20VAC Fuse, 10A Bussmann Type KTK Fuse, 30A Bussmann Type KTK i Fuse, 30A Bussmann Class RKS, Type FRN Six (6) of the energized circuits were fused with l Bussmann, Type KTK, 10 Am. fuses. The remaining l two (2) circuits were fused with Bussmann, Type KTK and FRN 30 Am. fuses, as shown In Figure 10 and Picture 11. 9
The current through the mein supply circuit breaker and each fused circuit was nonitored and recorded. A calibrated current transducer was used to monitor current through the fuses. The output of each transducer was connected to a Fluke 2280 B Data Logger. The current supp1!ed through the circuit breaker was nonitored by the logger. The test measured and recorded the leckage current through the circuit breaker and each Individual fused circuit as a function of tlne. Each current data point was scanned and recorded once a second. The test data shows the time when leakage current started to flow and the point at which the fuse f a i l ed. Continuity checks were nede after the test to confinn that the fuses had failed. The data logger ir.terfaced with a RS232 Interface rrodem to an IBM-PC, so that the data was stored on a floppy disc as shown in Figure 11. The data was then printed and plotted 6.0 Test Procedure 6.1 Flame Source Preparation The sane flame source set-up was used for all three (3) tests. The ribbon burner, alr-gas venturl mixer, air and gas rotameters and 20 lb. ccmrercial propane gas tank were all connected per Figure 2. All connections were sealed and the caroleted installation was checked for leaks with gas sniffing devices. The temperature of the flame source was checked prior to running the test. Af ter the flame source was ignited, the rotaneters were adjusted by needle valves for 70,000 BTU /HR. The tarperature was measured using a type "K" thennocouple, located in the flane, 3 inches above the top of the burner face. The temperatures were in the range of 1500 0F to 1600 CF, during the tests. The thermocouple remained in place and was used to monitor the temperature during all three tests. 10
l l
)
6.2. Cable Tray Preparation The same cable tray arrangement and cable loading was used for aII three (3) tests. Sultable lengths of the spectfled types of cable were individually randcmly Irid in a loop configuration, inside the 4 foot long cable tray. Both ends of each cable exited frcm the same side of tl'e t ray to . facilitate electrical connections. For tests 1 and 2,the non-energized cable conductors were connected together to the steel cable tray and tled to the power supply neutral. The cable tray was sup;orted horizontally over the flarre source (burner) usir<; a four legged frame. The frame was Isolated frcm grour.;' using insulators under each of the four 1 cgs, as shcw in Picture 3. In both tests a 4 conductor cable was energized and monitored for leakage current. Two (2) of the conductors were connected together and tied to the line side of the power supply. The other two (2) conductors were tied to the non-energized conductors, cable tray and neutral side of the power supply. Any leakage current between the line side conductors and other conductors or cable tray was measured and recorded. For test nurber 3, elght (8) cables were energized with 120 VAC and monitored (4-2 conductor and 4-4 conductor cables). Two (2) of the conductors of the 4 conductor cable were tied together and connected to the line side of the power supply. The other two (2) conductors were tied to neutral along with all non-energized cables and the cable tray. One (1) conductor of the 2-corWuctor cable was tied to IIne and the other to neutral, as shown in Figure 10 and Picture 12. 6.3 Test _Rocm Preparation Only the ribbon gas burner, cable tray and cable and thertrocouple were inside the test rocm. All piping, electrical and Instrtmentation connections exited the room via sealed penetrations. All rocm openings were sealed with the l I exception of a louvered opening on the main door to the room. During the test two exhaust hood ventilation fans were kept running, which kept the rocm at a slight negative pressure l with respect to the rest of the test laboratory area. This j caused air ficw frcm the test laboratory area tc the test rocm, via a 2' X 2' louvered opening in the door. The smoke , was exhausted to the outside through the main building ventilation system and ductwork (a snoke detector in the main ventilation ductwork was bypassed to avoid autcmatic shutdown of the ventilation system). The volune of the room is 2457 cubic feet. l 11 J
\
Each of the three tests were video taped using a cacorder g; located outside the test rocm. The filming was performed '/ through glass observation windows in the test rocm.
.,1 ;
6.4 Pcwer Sucoll U The capability of.the 120 yAC, 60 HZ. power supply was checkedbyconnectingadirectshortcircuitacrot.s'.be.ku.ver supply and nuasuring the mcmentary short circuit cu. rent. , The current was recorded at'49.9 anperes using a h;ok! Olgital Tong Set. , The pcwer supply to the test' specimen was corboitEd thrcugh a circuit breaker to protect the test laboratory Inst runentat ion. The cable lengths were short (less than 10') and therefore cable resistance had neg11 gable effect on the current supply. < 6.5. Test Circuit Connection The circuit connections for tests nunbers 1 and 2 are stovn in Figure 3. The basic circuit is a voltage divider , network. Two (2) resistances are in series. One (1) ) resistance is a fixed value resistance load, which provides l two functions:
- 1) Voltage Input to the analyzing recorders
- 2) Limits the fault current to below 50 amperes The voltage input to the recorder was proportional to the current flow thrcugh 2.a circuit. Initially there was no current ficw due to the series resistance of the undamaged cable Insulatice, which is on the order of a hundred megohms.
As cable insultatloc flame damage occured and the resistance dropped, a voltage proportional to leakne current throgh this resistance developed across the fixed resistance load box. I Resistarce values of the load box were set and measured i prior to the tes't along with megohnneter meesurements of the I cable insulation resistance. All connections were made and i checked including operation of the analyzer prior to the l test. l After the data frcm the test was collected and analyzed, manual calculations were performed to verify the Internal program used to calculate leakage resistance and current. 12
t / 'l gl . < t .
' 3-'
l 1
< ;) \ .
if The circuit connections for test nunber 3 is shown on Figures 10 and 11. The test circuit was set-up to simulate a 3, ccordinated breaker r , t'use panel arrangement. Each of eight (O energized cables were reparately fused and all , ere supplied tnrough a ccamon circuit breaker.
' A current-to-millivolt transducer was wirec In series with each circult and used to measure leakage current due to cable insulation damage from the flame source. The entr.ut frcm each transducer was conr.ccted to a data logger. Total current through the circuit breaker was measured with a clamp on anmeter arri connected to the data logger. The Data s I Logger hed a scan rato of 10 channels /second.
The Data Logger was' connected via a.1 RS232 Interface modem int erface to an IBM-FC Data frcm the test was a floppy disc, thrt ugh this Interface. and stored for future enalysis. Data was collected at'a 1 second scan rate frem the beginning of the test to the conclusion. The test was concluded alter the majority of the circults shorted and their fuses failed as
! a result of f)are damage.
6.5 Test Sequence' Test monitoring and data collection for .he three flame tests was autcmated. The only manually recorded datr. was the following. , i
- 1. Test room arblent temperature
- 2. Resistor load box value
- 3. Time required to trigger analyzer (Only for Tests 1 ,
1 ami 2') l
- 4. Total fiarne test time During each test the terrperature of the flame source was observed continuously along with the power supply line voltage. I I
For test nutber 1 and 2, the follcming sequence 4 L.vf -l 6.6.1 Record the afblent rocm te.Toerature. l 6.6.2 Measure the resistance of the load box. 6.6.3 Connect the test specimen to the power supply voltage source. l r
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i 13 l l 1
l
)
6.6.4 Check all connections of the test circuit and inputs to the analyzing recorder. ' 6.6.5 Energize and adjust the analyzing recorder and 3 i check the trigger set points. 6.6.6 Close the power supply breaker and measure the voltage, using the voltmeter. ( 6.6.7 Igalte the flame source and adjust the rotameters *i to supply 70,000 BTU's per hour. At this point the timer is started at T=0. 6.6.8 Monitor the flame test and flame source temperature until the analyzing recorder triggers, f 6.6.9 Record the time to trigger from the start of the
/
test (T=0), s 6.6.10 After the recorder is triggered, continue the test '/J for approximately 15 seconds, while data is being recorded. , f 6.6.11 Shut down the flane source and open the voltage supply circuit breaker.
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For test nuTber 3 the following sequence was used: 6.6.1 Record the ambient roon temperature. 6.6.2 Check the test specimen connections to the transducers and data logger, j 6.6.3 Close the comnon power supply circuit breaker. 9 6.6.4 Ignite the flame source and adjust the rotaneters 'I to supply 70,000 BTU's per hour. At this point the timer is started at T:0, s 6.6.5 Start the data logger at T:0, 6.6.6 Monitor the flame test and flare source tanperature until, either the circuit breaker trips or the fuses fall . 6.6.7 Shut dcwn the flame source, open the mitage supply circuit breaker and stop the data logger. 14
7.0 Test Results: 7.1 Test No.1 The analyzer triggered at 10 minutes from the start of the test. The analyzer was triggered at a cable insulation resistance value of 200 obns between the energized conductors , and neutral. Eight thousand data points were recorded during the four (4) second period. Figure 6 shaas a graph of the i cable Insulation leakage resistance versus time for the recording period. The energized cable did not experience a short circuit. During the recorded period the maxirrun insulation leakage resistance between the energized conductor and neutral was 272 ohrs which occurred at 601 MS and the mininun resistance was 18.57 ohms which occurred at 3752 MS. The maximum and minimum currents recorded were 5.508 Amos and 0.416 Anos. The following is a listing of various maximum and minimum points recorded. Insulation Leakage Points Time (Milliseconds) Resistance (OH45) Current (hMPS) 1 451 168.5 0.659 2 601 272.0 0.416 3 994.5 183.8 0.614 4 110.3 214.7 0.526 5 1831.5 128.0 0.877 6 1947 165.0 0.683 7 2202 116.0 0.966 8 2468.5 201.7 0.560 9 3752 18.57 5.508 10 3834 188.2 0.599 11 3918.5 21.2 4.880 12 3994 215.7 0.524 F!gure 7 is a graph of the current through the energized conductor into the high Impedance fault as a direct result of the cable flame darege to the Insulation. The average current is 1.009 Amperes for the 4 second period. The maxinun current peak of 5.508 Amps occurs at 3752 MS. and reaches that peak from an Initial value of 2.055 Anos in 6.18 cycles. The peak then drops to 0.7310 Arps in 2.97 cycles denonstrating the transient nature of the fault resistance. 15
s Pictures 4 to 7 show the extensive cable Insulation damage In the lower portion of the tray which is to be expected since they were closest to the flame source. In many cases the bare conductors were exposed. The top rrest cables experienced I minor visible damage which is attributed to the non-propagating - i and flame retardant properties of the nuclear grade cable being test W. Picture 5 shows the location and conditton of the energized 4/C 912 cable. Careful Inspection of the cable in the flame g I area did not reveal bare conductor. It is therefore concluded
- l that the leakage current occurred between the conductors of -
the same cable. i 1 In sunmry, the test data shows that short circuit leakage current of a limited magnitude, as measured, occurs due to Ir.sulation flame damage. The leakage current is Ilmited to very low values by the high impedance of the fault and does not reach a sustained valve for the range and test period measured. Test results show there was no distinct pattern to the fluctuations in leakage current during the period, except that they were transient. I a 9 16
l 7.2 Test No.2 A second test was conducted using the same arrangement as test 1 to support and confinn the results. Two minor nx>difications were made. The changes fram test no.1 vere:
- 1) Since the cables were randomly installed, the position of the energized cable in the cable tray flane area was different. This resulted in different times to trigger, supporting the hypothesis that cable damage is a function of position relative to the flame source.
l
- 2) The recording analyzer was set to trigger at 75 ohns j instead of 200 ohns. The scan rate and recording l
time were Increased fran 0.5 ml111 seconds and 4000 milliseconds to 1.0 millisecond and 8000 milliseconds. The analyzer triggered at 8 minutes and 5 seconds fran the start of the test. Eight thousand data points were recorded during the eight (8) second Interval after the analyzer triggered. Figure 8 is e graph of the cable Insulation leakage resistance versus time. The energized cable did not experience a total short circuit. During the recorded period the maximtn1 Insulation leakage resistance was 4969 ohns which occurred at 6146 MS and the minimun was 21.34 ohns which occurred at 7085 MS. The maximun and mininun Insulation leakage currents were 4.893 amperes and 0.023 amperes. Although the following listing is not all inclusive it represents a large senple of maximtm and minimun points. Points Time (Milliseconds) Resistance (OHMS) Current (AMPS) 1 885 33.50 3.220 2 1449 1140.00 0.100 3 1619 68.83 1.618 4 1889 1961.00 0.058 5 2210 32.81 3.286 6 2633 2540.00 0.045 7 3249 2852.00 0.040 8 3333 71.41 1.561 9 3600 3558.00 0,032 10 3697 115.6 0.974 11 3841 4111.00 0.027 12 6786 4710.00 0.016 13 4992 146.10 0.774 14 5191 3422.00 0.033 15 5774 90.12 1.245 l 16 6146 4959.00 0.023 17 7085 21.34 4.893 17
I Figure 9 ls a graph of the insulation leakage current through the energized conductor into the high irrpedance fault as a result of the cable flare damage. For the recorded duration, the average current is 0.7525 amperes for the 8 second period. The maximtm current is 4.893 amperes which occurs at 7085 MS. Pictures 8 to 10 show the cable insulation damage to cables in the lower portion of the tray, closest to the flane source. The damage is very similar to that of tost no. 1. As expected the top nest cables experienced minor visible cable insulation damage which can be attributed to the non-propagating and flame retardant properties of the nuclear j grade cables being tested. Conclusions resulting frcm the ! first test were supported by this test, t 7.3 Test No.3 This test was performed with the same tray, cable and flame source configuration as the first two (2) tests. Eight (8) cables were energized and each was separately fus.ed as shown in Figure No. 10. The current through each fuse was monitored as well as the total current through the supply circuit breuker. Other non-energized cables in the tray were connected to neutral. The test was stopped after 15 minutes due to excessive smoke in the rocm. At that time six (6) of the eight (8) circuit fuses had failed thereby' clearing short circuits on the Individual energized cable to which they were connected. Pictures 13 to 18 show the cable danage in the fire area. As in the first two tests, the cables in the bottom of the tray had much more danage than the cables at the top. The cables were carefully renoved frcm the tray and darcage in the fire area was photographed for each separate cable. The relative position of the cable in the fire area was noted along with the channel nunber, cable type, fuse size and type, time until fuse failed and failure sequence. This information is shown in Figure No. 14. Fuses associated with cables on Channel 13 and 18 did not fall. Figure 14 shows that these cables were located in the top most part of the tray. The cable damage to these circuits is shcm in Pictures No. 25 and 26. All energized cables located in the bottom and middle sections of the tray blew their fuses and sustained major cable flane damage as can be ; seen in Pictures 19 to 24. I 18
The results of test ntnber 3 confinn the results of the first two tests and also conclude:
- 1) The occurrerce of cable faults in a connon tray are not s imul taneous. Cables nearest the flame source develop flane danage related short circuits before cables further away. As a result, with the exception of cables 11 and 16 no simultaneous faults occurred during the test. Faults occurred simultaneously on cables 11 and 16 which were side by side in the bottan of the cable tray closest to the flame source as can be seen In Figur e No.14 "Cable Location In Flane Area Vs. Tine To Blow Fuse".
- 2) The cable fault short circuit characteristic has a high Impedance period followed by a transition to low Irtpe-dance, which results in fault clearing. During the high impedance perloa the current is limited to very low values which dre not effect electrical coordination. As shown in the table below the longest short circuit high Invedance period was 54 seconds for cable 16. During this period t1e recorded current was limited to a maxirrun valve of 1.901 anpers by the Impedance of the fault in cable 16.
Transient Start of Fuse Fault Maximum Leakage Melt Duration Leakage Current Clearing (Sec.) Current Chan. From T:0 Time Untti Recorded tb. Fuse (Sec's.) (Sec.) Clearing (AMP) 10 10A, KTK 428 477 49 5.136 14 10A, KTK 535 Sh6 11 0.540 15 10A, KTK 559 609 50 5.260 11 10A, KTK 601 651 50 9.310 16 30A, KTK 624 678 54 1.901 12 10A, KTK 679 687 8 4.758 For the cmmon bus configuration tested, the bus supply circuit breaker did not trip. The breaker is a Westinghouse, 120VAC Type EB, 30 amperes rated with thermal and magnetic trip elements. The maxinun recorded current through the breaker was 14.56 artperes. While the 14.56 artperes peak value transient occurred for less than 1 second, the breaker trip requiranent for this short time period is on the order of 220 anperes. Alternatively, the average current for the longest high impedance fault period of 54 seconds was 2.256 arrperes which included fault current fran cables 11 and 16. The sustained current required to trip the circuit breaker for a 54 second time period is 50 arperes. l 19
l As can be seen from Figure No. 12 "Total Supply Breaker Current Vs. Time During Flame Test" the circuit breaker was l not in Jeopardy of tripping due to cable fault high
- Impedance short circuit currents. The current through the I supply breaker was a ccrbination of the fault current contributions frcm each of the energized cables.
l l As shown in Figure No.13 "Load Supply Fuse Current Vs. Time During Flame Test", the short circuit characteristic of each l cable fault was similar. A high Impedance fault period l followed by a transition to low Invedance and then fuse fault clearing. The fuses used were type KTK, non-tInn delay fast acting which provided high speed of response above the 1000 second rating of the fuses. Under z!! cases i < the high impedance short circuit peak current recorded was I below the lowest fuse rating of 10 arrperes. At the transition to low Impedance the fuse failed Inmediately. The transition to low Inpedance was caused by conductor to conductor contact. o N e5 1 w --- 20
l Section 8.0 Figures Flqure No. Title Page 1 Test No.1,2 and 3 22 , Cable Tray And Flane Burner Arrangenent l 2 Test No.1,2 and 3 23 l Flane Source Connections 70,000 BTV's Per Hour 3 Test No. I and 2 24 Circuit Connections 4 Test No. 1 and 2 25 Cable Installation At Flare Area 5 Test tb. I and 2 26 Analyzing Recorder Program 6 Test No. 1 27 Cable Insulation Leakage Resistance Vs. Time (After Trigger) 7 Test No. 1 28 Cable Insulation Leakage Current Vs. Tine (After Trigger) 8 Test No. 2 29 Cable Insulation Leakage Resistance Vs. Tire (After Trigger) 9 Test No. 2 30
. le inculation Leakage Current Vs. Tine (After Trigger) 10 Test No. 3 31 Circuit Connections 11 Test No. 3. 32 l Data Logger Interface 12 Test No. 3 33 Total Supply Breaker Current Vs. Time 13 Test No. 3 34 Load Supply Fuse Current Vs. Time During Flame Test 14 Test No. 3 35 Cable Location in Flame Area Vs. Time to Blow Fuse 21
FLAME AREA 4, 0" ' I l l 1 6"WIDESTEdLCdBLETRAY 3"
@l i 3" T TEEL CHANNEL g SUPPORTS METAL SUPPORTS -* ,,,,,,,
INSULATED FROM 70,000 BTV/ HOUR GROUND (TYPICAL) FLAME SOURCE
@ INDICATES LOCATION OF FLAME SOURCE THERM 0 COUPLE NOTES 1.0 BURNER FACE IS 3" FROM BOTTOM OF HORIZONTAL TRAY.
2.0 BURNER LOCATED S0 THAT FLAME IMPINGES ON BOTTOM LAYER OF CABLES MIDWAY BETWEEN TRAY RUNGS. 3.0 THERM 0 COUPLE LOCATED IN FLAME, CLOSE TO BUT NOT TOUCHING CABLES. 1 FIGURE NO. 1 TEST NO. 1 , 2 , AND 3 CABLE TRAY AND FLAME BURNER ARRANGEMENT 22
CONTROL VENTILATED EXHAUST ROOM TEST ROOM I CABLE TRAY SUPPLY AIR - - TEST SPECIMEN pt ' biaVA (FROM LAB) ) 70,000 BTU /HR BURNER 2 / F1 h COMMERCIAL GRADE PROPANE 20LB TANK ITEM NO. DESCRIPTION
@ ROTAMETER FOR SUPPLY AIRFLOW, SET AT 163 10 SCFH
@ ROTAMETER FOR FUEL INPUT RATE, SET AT 70,0002 1600 BTU PER HOUR
@ AIR-GAS VENTURI MIXER, MFGRD. BY AMERICAN GAS FURNITURE C0.,
CAT NO 14-18 (2 LB /IN2 MAX GAUGE PRESS.)
@ RIBBON BURNER, MFGRD BY AMERICAN GAS C0., 10", CAT. NO. 1614 FIGURE NO 2 TEST NO. 1, 2, AND 3 FLAME SOURCE CONNECTIONS l 70,000 BTV'S PER HOUR l
23
ENDS OF LOOPED ENERGlZED CABLE (4/C #12) (TYP) RESISTIVE " ]
- CABLE TRAY LOAD BOX u' -
n , LINE TEST LAB 10K ;!
<- 4400 400 4,00\_
\ CONNECTION TO WHITE & GREEN
' f CONNECTION POWER yy 10g;! CONDUCTORS TO
~
SUPPLY RED 8 BLACK 10K ji CONDUCTORS
,, NEUTRAL e ^
l D A B C CHANNEL INPUTS B + C USED FOR CALCULATION FUNCTION ANALYZ 4G RECORDER NOTES: 1.0 FIXED RESISTOR VOLTAGE DIVIDERS USED TO~ REDUCE VOLTAGE INPUT TO RECORDER. 2.0 ALL CONDUCTORS OF UNENERGlZED CABLES ARE TIED TO NEUTRAL l 3.0 TEST LAB POWER SUPPLY WAS NOMINAL 115VAC WITH A 50 AMPERE CAPACITY FIGURE NO. 3 TEST NO 1 AND 2 CIRCUIT CONNECTIONS 24
"W ENERGlZED CABLE 3"
u < 6"
- 2/C #10 (CODE 125-09516) 4/C #12 (CODE 125-09512)
O 1/C #12 (C0DE 125-09508) 1 NOTE: 1.0 g RANDOMLY INSTALLED IN THE TRAY TO SIMULATE FIELD AR hN HE SDEbF HE'TR Y 3.0 PER CENT TRAY FILL IS 28,57.. FIGURE NO. 4 TEST NO. 1 AND 2 CABLE INSTALLATION AT FLAME AREA 25
1 I MODEL 3655 LIST I l MODE: MEMORY l SAMPLE RATE: 1.00 ms (Test 2) 0.50 ms (Test 1)
**** SET RANGE ****
CH. INPUT RANGE FILTER A AC 60V 0FF B 0FF C 0FF l D AC 60V 0FF
**** SET TRIGGER ****
TRIGGER LEVEL : 6% (Test 2) 2% (Test 1) TRIGGER SOURCE : A TRIGGER SLOPE : POS PRE TRIGGER : 10% SAMPLE CLOCK : INT i I !-
**** SET PR0 GRAM ****
PROGRAM : ON 1 UNIT LOW HIGH Y1 = H'(SQR(MEAN(A*A))) SV 0.000 180.0 Y2 = (H'(SQR(MEAN(A*A))))/F 1 0.000 60.00 Y3 = (G/((H'(SQR(MEAN(A*A))))/F))-F R 0.000 300(Test 1) 3000 (Test 2) Y4 = 1*(SQR(MEAN(D*D))) LV 0.000 180.0 2.165 (Test 1) F = 2.120 (Test 2) G = 114.8 H = 3.010 1 = 2.994 J = 0.000 , K = 0.000 L = 0.000 M = 0.000 N = 0.000 0 = 0.000 ; P = 0.000 0 = 0.000 R = 0.000 S = 0.000 T = 0.000 l 1
**** SET DISPLAY FORMAT **** '
DISPLAY MODE: SINGLE l 1: Y1 - SHUNT VOLTAGE l 2: Y2 - LEAKAGE CURRENT 3: Y3 - LEAKAGE RESISTANCE 4: Y4 - LINE VOLTAGE FIGURE N0. 5 TEST NO. 1 AND 2 ANALYZING RECORDER PROGRAM 26 '
300 I _ 225 - E @ 9 @ U @ @ ,
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5 O d/ y150 - E \ u @ s @ S 75 - h i , , , , @@ 0.0 4000.0ms TIME AFTER TRIGGER OF RECORDER (MILLISECONDS) SCAN RATE: 0.5 MILLISECONDS TRIGGER TIME: 10 MINUTES
@ - EXTREME POINTS, SEE REPORT SECTION 7.1 FOR VALUES FIGURE N0. 6 TEST NO. 1 CABLE INSULATION LEAKAGE RESISTANCE VS. TIME (AFTER TRIGGER) 27
10 7.5 - ^ E' !.88A x 5 5.508 s N 5 E 5 - S P J & I s O a 4 2.5 - d .I l
-%-_ - s I i I i 0.0 4000.0ms TIME AFTER TRIGGER OF RECORDER (MILLISECONDS)
SCAN RATE: 0.5 MILLISECONDS ! TRIGGER TIME: l 10 MINUTES ! l FIGURE No. 7 TEST NO, 1 CABLE INSULATION LEAKAGE CURRENT VS. TIME (AFTER TRIGGER ) 28
l l 3000 bb OO @
) 1 t
I g 2250 - l @ ! d / ! l ; 5 : G G 1500 - U \ ' 1 g @ 4 \ r I ' s ' 750 - ,
\ , l ,
i
) -
\ y f l J 1 1 .
i h ,@ -@ , 0 @ h 8000ms l TIME AFTER TRIGGER OF RECORDER (MILLISECONDS) SCAN RATE: 1.0 MILLISECONDS TRIGGER TIME: 8 MINUTES 5 SECONDS
@ - EXTREME POINTS, SEE REPORT SECTION 7.2 FOR VALUES 1
FIGURE NO. 8 l TEST N0, 2 j CABLE INSULATION LEAKAGE RESISTANCE VS. TIME (AFTER TRIGGER) l 29 1
l 10 l l 1 l l 7,5 - G l E 5 ~ 1 4.893A $ 5.0 - : " k i w 3,22A 3,286A 1 ' $ [t 2,5 - - 4 h Ji F g 0 1 \ l' W 0 8000ms l TIME AFTER TRIGGER OF RECORDER (MILLISECONDS) SCAN RATE: 1.0 MILLISECOND TRIGGER TIME: 8 MINUTES 5 SECONDS FIGURE N0, 9 TEST N0, 2 CABLE INSULATION LEAKAGE CURRENT VS, TIME (AFTER TRIGGER) 30 i i
UNE c Jb o o)EB-30(TYPEEB1030) s CLAMP ON AMMETER (/ (T0 DATA LOGGER) b i 5; 5 55 104 ica 104 104 104 toA 7:a soA e [xix [<tc [xic [ xix [xix [ cic [ (ir, [ran
- MU a
h b5 3E b5 )[ 3( )[ b(I )[ (4T0TRANSDUCE DATA LOGGER) h ! _!_ _i _i l _! _s _i
- CONDUCTORS
$ m n m n6m n n n ~
v v v v V, v v v v 4-- CABLES Igl Igl Igl a sie Igl Igl is lll l%l l%l ll [!! I$ llill l!l l l%l 4- FLAME AREA O O O ^ v v ss s] @ O sJ O v [> ss + CABLE TRAY l l l
= = = x l V j j = g j j g y 4- -CONDUCTORS C
NOTES: 1.0 5 - IND'O TES 5 AMPERE TRANSDUCER TO DATA LOGGER NUMBER INDICATES CHANNEL INPUT, FIGURE N0. 10 TEST NO. 3 CIRCUIT CONNECTION 31
TEST f T SPECIMEN < : ; CABLES '. f
~ ~
SEE FIG. 10 $ CLAMP ON AMMETER d' d' d' J' J' J' J' JL 10 Il 14 15 12 13 16 18 y 3 y -- -- 5 - INDICATES CHANNEL N0, SCAN RATE = 10 CHANNELS /SEC, K 8OB ' f lill E $ sw m_ RS232 TO PC DIRECTLY ONTO FLOOPY DISC IBM : e il L RE m . DATA CAN BE PRINTED AS TEXT OR PLOTTED FIGURE NO. 11 TEST N0 3 DATA LOGGER INTERFACE 32
15
~ '
EB-30 SUPPLY CIRCUIT 33 _ TOTAL CURR[ DURINGFLAME 12 - - 11 ; 10 - en L 9 _ 2 8 - 7 - 6 - 5 - l r 4 Y b]f
' ' ' ' ' 'l 3
400, 440, 480 520) 1 d l SCAN RATE - ONCE PER SECOND . NOTE: TIME SCALE IS SECONDS AFTER START OF FLAME SOURCE.' I l .
?
TOTAL SUPPL 7 DU@ 33: j
- ~
._..-_,_._,.I
@REAKER , , ENT 'n .. ,T APERTURE CAllD i Also Available On
. Apertue Card l
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A n= J A / % . w l t ! I t i I I t j 560 600 640 080, lECONDSj - TGURE NO 12 TEST N0 3 , ppg (,A/005~2'o/ BREAKER CURRENT VS.TIMEi ING FLAME TEST! .
10 fasI 10 AMP,KTK, LIMIT @ CH 10 CH 11 -.10 AMP,KTK, LIMIT % 10 AMP,KTK,LIMITd CH 12 8 - CH 14 10 AMP,KTK,LIMITf CH 15 10 AMP,KTK, LIMIT-7 - CH 16 30 AMP,KTK, LIMIT-CH 13 10 AMP, KTK, LIR 6 - CH 18 30 AMP,FRff,FUSETF w 5 - c i 2
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18 3 l l TOP 13 13 MIDDLE 15 14 3" f __ _ __ 14 15 l 10 ll 12 1 4 6" 5 FROM START OF FLAME CHANNEL # CABLE TYPE FUSE TIME TO BLOW FUSE (SEC) FAILURE SEQUENCE 10 4/C #12 10A, KTK 477 1 14 2/C #10 10A, KTK 544 2 15 2/C #10 10A, KTK 609 3 11 4/C #12 10A, KTK 652 4 16 2/C #10 30A, KTK 679 5 12 4/C #12 10A, KTK 688 6 l 13 4/C #12 10A, KTK DID NOT BLOW NO FAILURE 18 2/C #10 30A, FRN DID NOT BLOW NO FAILURE NOTE: 10' - INDICATES ENERGlZED CABLE AND DATA LOGGER CHANNEL NO. INPUT 1 l l - INDICATES UNENERGlZED CABLE, ALL CONDUCTORS AND TRAY l CONNECTED TO NEUTRAL. l FIGURE NO. 14 TEST NO. 3 CABLE LOCATION IN FLAME AREA VS. TIME TO BLOW FUSE 35
1 i Section 9.0 Pictures Picture No. Title g 1 Test No. 1 and 2 38 : Control Room Instrurentation Rotameters, Lead Box, Analyzing Recorder 2 Test tb. I and 2 39 , Yew Model 3655 Analyzing Recorder l 3 Test tb. I and 2 40 Flame Source, Cable Tray and Cable Connections 4 Test tb. 1 41 Cable Damage 5 Test t!o.1 42 Cable Damage, Burner and Thernocouple Wirs , 1 1 6 Test f4o. 1 43 Cable Damage, Burner and Thermocouple Wire i 7 Test tb. 1 44 Cable Damage S Test tb. 2 45 Cable Damage 9 Test tb. 2 46 Cable Danage 10 Test tb. 2 47 Cable Damage 11 Test tb. 3 48 l Circuit Breaker, Fuses, Transducers l And Fluke Data Logger ! 12 Test No. 3 49 Electrical Cable Connections At Cable Tray i 13 Test tb. 3 50 Cable Damage in Flame Area Top of Tray l 14 Test tb. 3 51 Cable Damage 15 Test No. 3 52 i
- Cable Damage and Burner l 36 l
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l t Pleture No. (Cont'd) Title (Cont'd) Page
-16 Test No. 3 53 Cable Damage and Burner 17 Test No. 3 54 Cable Damege 18 Test No. 3 55 Cable Damage, Burner and Melted Conductor 19 Test No. 3 56 ,
Channel #10 Cable 20 Test No. 3 57 : Channel #14 Cable ! 21 Test No. 3 58 . Channel #15 Cable , l 22 Test No. 3 59 , Channel #11 Cable l
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23 Test No. 3 60 l Channel #16 Cable 1 l l 24 Test No. 3 61 Channel #12 Cable 25 Test No. 3 62 Channel #13 Cable j 26 Test No. 3 63 Channel #18 Cable l 37 ; I l
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Section 10.0 List of References
- 1. IEEE Standard 383-1974, "IEEE Standard for Type Test of Class IE Electric Cables, Field Spilces, and Connections for Nuclear Power Generating Stations".
- 2. USNRC Gener ic Letter 86-10 (April 24,1986) "Inplernentation of Fire Protection Requirements".
- 3. PBAPS 10CFR50, Appendix R Electrical Coordination Study (August, 1986).
4 USNRC Regulatory Guide 1.131, "Oualification Tests of Electric Cables and Fleid Sp1 Ices for Light - Water - Cooled Nuclear Pcwer Plants", issued for Ccmnents August 1977. RBR/ss/05208801 64
Section 11.0 List of Data Acc.uisition Instrtsnents 1 Model No. ID No. Range Accuracy Cal. Expire Equipment Manufacturer 1 Brooks 21-0173 0-286,000 1 2% RDG 10-6-88
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; Digital Fluke 2-16-88 Manual 1 0.25% FS Thennameter 8060A 57-5946 See 1 0.5% 6-15-88 ,
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Section 11.0 List of Data Acquisition Instrunents Equipment Manufacturer Model No. ID No. Range Accuracy Cal. Expire Megger Biddle - 32-1953 50,000 MEG 0HM ? 1 Div. 11-8-87 Digital Tong Hioki 3206 01-0131 See Manuab See Manual 2-25-88 ; Set -
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