ML20236Q201
| ML20236Q201 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 10/01/1987 |
| From: | William Jones, Ragsdale J, Wormsley J TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20236Q176 | List: |
| References | |
| NUDOCS 8711190237 | |
| Download: ML20236Q201 (10) | |
Text
C
~' Temperature Measurement Report for the Long Term Current Test on Littlefuse, FLAS-5, 5 Amp Fuses" l
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- L'NITED STATES GOVERNMS.YT
. Mc7nord7t d um TENNESSEE VALLEY AUTHORITY
'i TO W. S. Raughley, Branch Chief; Electrical En61neering Branch, DNE,-
W8 C126 C-K'
'j FROM Richard L.,,Morley, Chief Central Laboratories Services Branch, LA PSC 1-C DATE
- October 1, 1987
SUBJECT:
SPECIAL TESTS ON LITTELFUSE FLAS-5 FUSES N hallab}e Co&
l Pursuant to your request, i.ttached 15 the final report containing the results of the special' tests that Central Laboratories Services Branch (CLSB) performed on Littelfuse type FLAS-5 fuses for Sequoyah Nuclear Plant.
This report replaces the. copy that was telecopied.'
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We hope that the report will assist you and.look forward to. continuing to support your future needs. 'Should you have any questions or additional needs, please feel' free to. contact CLSB.
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RLM:EC Attachment cc (Attachment):
RIMS, MR AN 72A-C Ken Greene, W8 C144 C-K i
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TEMPERATURE MEASUREMENT REPORT FOR THE LONG TERE CURRENT TEST ON LITTELFUSE, FLAS 5, 5 AMP PUSES Best Available Copy i
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O, INTRODUCTION b# ^
o During Long Term Current Tests on fuses for Sequoyah Nuclear Plant at the CLSB, some temperature measurements were made and reported to the plant and to the Division of Nuclear Engineering (DNE).
Ken Greene of DNE verbally requested that more data be obtained. A formal report was requested on September 18, 1987 and this document summarizes the data collected, in Table I.
TEST REQUIREMEN]S The test requirements were to select various fuses, already under test in the Long Term Current Test at the Central Laboratories Services Branch (CLSB), and make temperature measurements at four different locations on each selected fuse. Figure I identifies these locations.. The fuses that were examined are l
Littelfuse, indicating type PLAS 5, 5 amp fuses from lot numbers 004, 006, 010, and 011.
The temperature measurements were recorded after the fuses were placed in the circuit and had reached thermal equilibrium.
At least 10 fuses from each lot were sampled.
A breakdown of the sampling is detailed in the test setup section of this report.
TEST EQUIPMENT t
Digital Thermometer Fluks Model 2165A US TVA No. 462383, with type K thermocouple, US TVA No. 903320.
Digital Volt Meter, Fluke Model 8400A US TVA No. 305628.
Precision Resistors, US TVA No. 903309, US TVA No. 903310, US TVA No. 903311 US TVA 903312, US T7A 903319.
TEST SETUP 4
The ongoing Long Term Current Test was used as the test setup.
Figure II provides a simplified wiring diagram for each fuse lot tested.
Figure III provides a physical layout of the test setup for each lot of fuses.
This consisted of at least 5 high current and 5 low current samples, 4 amps and 2 amps respectively. Each fuse bears the vendor's label which has the lot number visible.
Additionally, fuses were individually labeled for easy identification by labeling them with either an H or an L, high current or low current and sequentially numbering them within each test loop. A test loop consisted of a particular lot number of fuses and the current level they were tested at.
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L There were two special test loops of 1 amp and.25 amp that were requested by DNE.
One fuse each from lot 010 and 011 were installed in the 1 amp loop.
Temperature readings were not made until sufficient time had passed for the fuse temperature to stabilize. After the temperature measurements at this current level were recorded, the current was adjusted to.25 amp and the process repeated.
The test setup and measurements taken on the special test loops were the same as the other test loops.
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In Figure II th:ro is notatica of a precision resistor that is used to measure the current flow in each test loop. Table II provides a breakdown of each test loop and the precision resistor number installed in it.
i MEASUREMENT PROCESS Best Available Copy All of the fuses. tested had been installed, and carried their specified current long enough for temperature stabilization to take place prior to any temperature measurements being made.
conducted was approximately 760F and stable.The room temperature where this was 1
A Fluke 2165A digital thermometer with a type K thermocouple (TC) was used to make all of the temperature measurements.
Measurements made at locations 1 2, and 3 were made by placing the TC against the fuse surface at each location l
until the reading stabilized, then the measurement was recorded.
To make the measurement at location a, a small hole was drilled in the fuse case at the solder junction.
The TC was then inserted into the hole and held against the solder joint until the reading stabilized, then the measurement was recorded.
1 A Flute Model 8400A DVM and precision resistors, as shown in Table II, were used to monitor the current in each test loop during temperature measurements.
CONCLUSION Table I contains all of the data recorded during this test.
It is grouped by fuse lot number and by test loop current level.
It should be noted that the i
measurements =ade at location 4 were the most difficult measurements to m The reason for this was in making sure the solder joint was not damaged when
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drilling the access hole and in making good physical contact between the IC
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and the joint on each fuse examined for, consistency from fuse to fuse.
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4 Since the fuses are a part of the Long Term Current Test, we will leave them in that test for future reference.
were made in the daily test log.
Notations regarding the drilling of holes j
W. G. Jones at extension 4219-C.If you have any questions regarding this rep 1
that we can.
We will be glad to assist you in any way l
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~MEASUR8 MENT LOCATION' JUNCTION / AMBIENT-Let No. 004 Fuse #
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4 aT H2 1218F 1080F
-1040F' 129D7
$307 H3 1170F 104aF 1000F 123*F 470F -
H5 1240F 1010F 1040F 1360F 40 P'
.H 7 1210F 1050F-1020F 132*F 560F' H10 1190F 1040F 1050F 1360F 60 F
-H14 121oF 1030F 1040F 1350F.
590Fc HIS 1190F 1000F.
101*F 1270F 510F H18 1170F 1010F 1010F 1260F 500F H19 HI *F, 93*F 970F 1200F 440F Average Temp.
lisoF 1020F 102of 129aF 530F L5 870F 82 P 820F 880F-120F-L7 66'F 820F 820F 900F 140F L10 860F 820F 82*F 890F
-130F L14 880F 830F 830F 890F 130F L15 87aF 830F 83*F 890F 130F-l L18 880F 860F 870F 880F 120F-l Avera6e Temp.
87'F 83ar-830F 890F
-130F Lot No. 006
'N 5 1250F 1050F 111 F 1330F 570F E10 1250F
'1070F 105DF 1300F 540F H15 1230F 1060F 1090F 1310F 550F H2O 1250F 1070F 1020F 1420F-660F H25 H9'F 10&oF 1190F 1470F-71oF Average Temp.
1230F 106of 1090F 1360F 61*F-L5 88'F 850F 860F 900F 14*F L10 88cF
$40F 860F 890F 130F-L15 900F 850F 860F 90oF 140F L20 890F 850F
-87*F 910F 150F L25
,,8, 'F 850F_
850F E
140F 7
Average Temp.
880F
.8SoF 860F 900F 140F Lot No. 010 H5 1090F 950F 960F 1160F 400F
-l H7 114cF 1030F
-940F 111 F 350F l
H10 1120F 950F 940F 1190F 430F
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HIS 1120F 970F 940F 1220F 460F E18 1100F 960F_
960F M00F_
440F_
Average Temp.
lilof 970F 950F 118SF 420F L5 86*F 830F 830F-86*F 100F 1
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'860F 830F
.820F 870F lioF L105 860F' 820F 410F 880F 120F L15 860F 82*F 820F 860F 100F L18 878F 82cP 820F
_860F 100F Average Temp.
860F 82*F 82 F.
870F
'llof SPECIAL CURRENT TESI 1A 76*F 770F 770F 78*F
.25A 750F 750F 758F 750F
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a MEASUREMENT LOCATION JUNCTION / AMBIENT-Lot No. 011 Fuse /t
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aT H7 1130F 990F 97 F 1180F-42of H14 1120F 970F-96*F 1230F 470F-H21 1100F 96eF 950F 1150F 3?oF
.H28 1100F 980F 950F
- 119 0F.
430F-H35 J120P-
_91og 940F 1190F 430F Average Temp.
1110F 970F 950F 1190F 430F L7 850F-820F 820F 870F 11oF.
L14 860F B20F 820F 87"F 11oF L21 870F 830F.
820F 890F-130F
- L28 86*F 820F 830F 880F 12 F L35
_860F
_820[
810F-
_860F-
'100F 2v'erage Temp.
860F 82 F
.620F 87 F 11oF SPECIAL CURRENT TEST 11 780F 770F 770F 790F
.25A 75*r 750F 750F 760F' Note:
The temperature data for fuses in Lot 004, No. H2, HS, H10, HIS, and H19 was collected on September.3, 1987.
The remainder was collected on September 11, 1987.
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TABLE II l
Fuse Lot Resistor I.D. In Test Loop Number 2_ amp loop A_ amp loop s
004 US TVA No. 903312 US TVA No.- 903312 l
006 US TVA No. 903309 US ITA No.- 903309 010 US TVA No. 903311 US TVA No. 903311 I
i 011 US TVA No. 903310 US TVA No..903310 Special 1 amp and.25 amp test loop used US ITA No. 903319. R2.
Precision Resister Installation Guide I
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.Tenpera:ure Measurenen: Loca:Lons 1 indicates the exposed end of <he indica:ing pin.
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21:.dicates :he and esp on :he indicating and.
3 indicates the opposi:a end cap.
4 indicates :he solda: junc:Lon inside che fuse.
TIGli?J. I Variable resister to establish curren:' level.
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POVer 2 a:p loop Fuses in series, Supply in the tes: loop 1
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Precision resisco to measure tasc loep current-j h * ',*
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M-Typical tes: loop setup for each lot.of fuses.
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a cuality of Tuses Under Test Let #
2 ano lece-4 a=o loco 004 20 20 006
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010 20
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Physical layout for testing a particular fuse loc.
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