ML20195J772

Impact Testing of Aiw Cable

ML20195J772
Person / Time
Site:	Sequoyah
Issue date:	07/22/1987
From:	Childres W, Riner G TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20195J745	List: ML20195J742 ML20195J758 ML20195J772 ML20195J803 ML20195J825
References
SME-MET-87-043, SME-MET-87-43, NUDOCS 8801290010
Download: ML20195J772 (11)

Text

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846 '870722 001 TENNESSEE VALLEY AUTHORITY DIVISION OF NUCLEAR ENGINEERING NUCLEAR ENGINEERING BRANCH SINGLETON MATERIALS ENGINEERING LABORATORY SEQUOYAH NUCLEAR PLANT IMPACT TESTING OF AIW CABLE SMS . PIT-87-043 July 22, 1987 Reviewed by N l

Approved by A27135.4 8801290010 880125 7 DR ADOCK 05

w B46 '87 072 2 001 SEQUOYAH NUCLEAR PLANT IMPACT TESTS OF AIW CABLE It has been postulated that the subject AIW cable develops small voids on the inside surface of the rubber insulation when subjected to impact forces. The purpose of this test was to verify that the voids are from an impact origin and, if possible, determine the level of force required to produce the voids.

A length of new cable was supplied to Singleton Materials Engineering Laboratory (SME) from which samples were choosen at random for testing. Samples 1, 2, and 3 given in table 1 are as-received control samples and have not been subjected to any impact testing. All three samples show no signs of voids. ,

-- In order to determine the impact energy capt.ble of creating a void in the AIW rubber insulation, a impact tester normally used for compacting soil was employed (see figure 1). The total mass of the impact weight is 5.5 lb, which can be dropped from various heights to provide known impact energies. Three drops were made at each selected energy level to ensure that the results were repeatable. Voids noted are typical of that shown ir figure 2. The maximum impact at which no voids occured in three test samples when dropped on a 2-in. length of cable was determined to be 3 66 ft-lb. When a 45 test block was dropped on the cable applying a force 45 to the length, no damage was seen at 5.0 f t-lb energy, the maximum force for the fixture. It was noted that on all samples impacted perpendicular to the length a cross-hatch imprint of the woven braid appeared on both the impact side and the side opposite, see figure 3 Table 1 lists all impact data obtained on the flat impacts done as shown in figure 1 and applied on a 2.in, length of cable.

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2 Conclusion It is possible to create the voids noted in a repeatable manner using very low impact energy levels. As stated above, the energy at which no voids were created was 3 66 ft-lb for the 2-in. length or 1.83 ft-lb per linear inch perpendicular to the sample.

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Table 1 SEQUOYAH NUCTRAR PLANT JUPACT ENERGY ON 2-IN. LENGTHS OF AIW CABLE .

. ( AIW Corporation 77K5-822502 SROAJ 600V 14AWG 1/C WPA) s Sample Aoolled Load External Markings Internal Markines 1 No Load None None 2 No Load None None 3 No Load None None 4 (12"){5.5 lb) = 5.5 ft-lb Slight flattening, cross hatched markings 4 voids 5 (12")(5.5 lb) = 5.5 ft-lb Slight flattening, cross hatched markings 2 volds 6 (12")(5.5 lb) = 5.5 f t-lb Slight riattening, cross hatotted markings 4 voids and white streak 7 (11")(5.5 lb) = 5.0 ft-lb Very slight riattening, cross hatched markings 2 white streaks 6 (11")(5.5 lb) = 5.0 ft-lb Very slight riattening, cross hatched markings 1 void 9 (11")(5.5 lb) = 5.0 ft-lb Very slight flattening, cross hatched markings 4 voids 10 (10")(5.5 lb) = 4.6 f t-lb Cross hatched markings 1 void and white streak 11 (10")(5.5 lb) = 4.6 ft-lb Cross hatched markings 3 voids and white streak 12 (10")(5.5 lb) = 4.6 f t-lb Cross hatched markings 3 voids 13 ( 9")(5.5 lb) = 4.1 ft-lb Cross hatched markings None 14 ( 9")(5.5 lb) = 4.1 ft-lb Cross hatched markings 1 white streak 15 i 9")(5.5 lb) = 4.1 ft-lb Cross hatched markings 2 voids 16 ( 8")(5.5 lb) = 3.6 f t-lb Cross hatched markings None E7) 17 ( 8")(5.5 lb) = 3 6 f t-lb Cross hatched markings None 4_.

18 ( 8")(5.5 lb) = 3 6 f t-lb Cross hatched markings None C)

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ATTACHMENT 3 MEMORANDUM FROM D. W. WILSON TO W. S. RAUGHLEY SEQUOYAH NUCLEAR PLANT - IMPACT TESTING OF ROCKBESTOS AND ANACONDA CABLES September 9, 1987 M .

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B46 '87 0831

, UNITED STATES GOVERNMENT 005 Memorandum TENNESSEE VALLEY AUTHORITY

{S.Raughley,ChiefElectricslEngineer,W8C126C-K/

FROM - D. W. Wilson, Chief Nuclear Engineer, W10 C126 C-K DATE .

SEP 9 1981 SUDJ ECT: SEQUOYAH NUCLEAR PLANT - DiPACT TESTING OF ROCKBESTOS AND ANACONDA CABLES We are trans=itting the Singleton Material Engineering Laboratory report SME-MET-87-064 as requested by Brian Reagan on August 22, 1987

&l* llhtl q D. W. Wilson GLR:MHD Attach =ents cc (Attach =ents):

RIMS, SL26 C-K W. H. Childres, SME-K --

4 This was prepared principally by Gary L. Riner, extension 2771.

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