ML20236Q201

Temp Measurement Rept for Long-Term Current Test on Littlefuse,Flas-5,5 Amp Fuses

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: ML20236Q173 ML20236Q187 ML20236Q198 ML20236Q201
References
NUDOCS 8711190237
Download: ML20236Q201 (10)

Text

C Attachment 3

~' 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 TO  : 'i W.W8 S.C126 Raughley, C-K' Branch Chief; Electrical En61neering Branch, DNE,- 'j '

FROM  :

Richard L.,,Morley, Chief Central Laboratories Services Branch, LA PSC 1-C l

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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RIMS, MR AN 72A-C Ken Greene, W8 C144 C-K ,

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o INTRODUCTION b# ^

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, 010, and 011. indicating type PLAS 5, 5 amp fuses from lot numbers 004, 006, 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.

4 TEST SETUP 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 tested at. of a particular lot number of fuses and the current #level they were consisted 3 L V There DNE. were two special test loops of 1 amp and .25 amp that were requested by 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 longmeasurements temperature enough for temperature being made. stabilization to take place prior to any 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 solder junction. at location a, a small hole was drilled in the fuse case at the The TC was then inserted into the hole and held against the 1 solder joint until the reading stabilized, then the measurement was recorded.

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 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. (

4 Since the fuses are a part of the Long Term Current Test, we will leave them in that test for future reference. Notations regarding the drilling of holes j were made in the daily test log.

1 W. G. Jones at extension 4219-C.If you have any questions regarding this rep that we can. We will be glad to assist you in any way l

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Let No. 004 Fuse # 1

~MEASUR8 MENT LOCATION' 2

JUNCTION / AMBIENT-3_ 4 aT H2 1218F 1080F -1040F' H3 129D7 $307 1170F 104aF 1000F 123*F H5 470F -

1240F 1010F 1040F 1360F

.H 7 1210F 40 P' 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-L7 66'F 820F 120F-820F 900F 140F L10 860F 820F 82*F L14 890F -130F 880F 830F 830F 890F L15 87aF 130F l 830F 83*F 890F L18 880F 130F-860F 870F 880F Avera6e Temp. 120F-l 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 Average Temp. 1190F 1470F- 71oF 1230F 106of 1090F 1360F 61*F- .

L5 88'F 850F 860F L10 900F 14*F 88cF $40F 860F 890F L15 900F 130F-850F 860F 90oF L20 890F 140F 850F -87*F 910F L25 ,,8,7 'F 150F Average Temp. 880F 850F_

.8SoF 850F 860F E 140F 900F 140F Lot No. 010 H5 1090F 950F 960F 1160F H7 114cF 1030F 400F -l l -940F 111 F 350F H10 1120F 950F

( HIS 940F 1190F 430F 1120F 970F 940F E18 1220F 460F 1100F 960F_ 960F Average Temp. lilof M00F_ 440F_

970F 950F 118SF 420F L5 .

86*F 830F 830F- 86*F L7 '860F 830F 100F 1 L105 .820F 870F lioF 860F' 820F 410F .

L15 880F 120F 860F 82*F 820F L18 860F 100F 878F 82cP 820F Average Temp. _860F 100F 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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TABLE I (cont.)

MEASUREMENT LOCATION Lot No. 011 Fuse /t JUNCTION / AMBIENT-

__1__ __[__ 3 4 aT H7 1130F 990F 97 F 1180F-H14 1120F 42of 970F- 96*F 1230F 470F-H21 1100F 96eF 950F 1150F 3?oF

.H28 1100F 980F 950F H35

- 119 0F. 430F-J120P- _91og 940F 1190F 430F Average Temp. 1110F 970F 950F 1190F 430F L7 850F- 820F 820F 870F L14 11oF.

860F B20F 820F 87"F L21 11oF '

870F 830F . 820F 890F-

L28 130F 86*F 820F 830F 880F L35 _860F 12 F

_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.

September 11, 1987. The remainder was collected on 9

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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 i

US TVA No. 903311 I 011 US TVA No. 903310 US TVA No. .903310 Special 1 amp and .25 amp test loop used US ITA No. 903319. R2.

I Precision Resister Installation Guide '

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