ML20050D003

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Qualification of Okozel Insulated Wire & Cable for Nuclear Plant Svc
ML20050D003
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 09/30/1979
From:
OKONITE CO.
To:
Shared Package
ML20050C841 List:
References
RTR-NUREG-0588, RTR-NUREG-588 IEB-79-01B, IEB-79-1B, K--1, K-0-1, NUDOCS 8204090472
Download: ML20050D003 (10)
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,i. ' * * ;* f;',*. !. .4.. ' i b' QUA,LIFICATION OF OKOZEL INSULATED WIRE AND CABLE C. for b-NUCLEAR PLANT SERVICE 1:. ?. '.f4;' i; 'f;;. .s. a:A.1 .x L.. t l.f: ..r .{ Qualification for nuclear pla,nt service has been 1~ " i[ performed at Okonite on sarpples of Okozel(Tefzel) ,..j insulated wire and cabic. This insulation is fully ..{ M Ij capabic of meeting all the aging, radiation, moi's - 6,'. ture, and flame test requirements as stipulated in IEEE Standard 383-1974 Based on the test results presented in this document. Okozel is qualified for nuclear plant applications. a ...g. 8 ag-Index s,. (. Section Title -l I Thermal Aging .;,f,.. - J,,n.r - ..G,.. ~ 11 Loss of Coolant Accident Testing 's %. s.: o .? III Moisture Resistance

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F u IV Vertical Tray Flame Test i .....'I .y. s i. t;. % =r 91 .~

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[ PPDR ADOCK 05000327 PDR Rcp. No. K-0-1 (Sept.1979)

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8 TH'] OKONITE COMPANY gga d

/ 3 -~~ o. 'l. SECTION I - g.'[% ?..;; . Q.. ' i.. .. ~ - THERMAL AGING .o s

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e .s. :. -',.y'- Thermal aging information on Okozel has been provided to Okonite by E. I. DuPont Company. DuPont has performed extensive testing,,

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on the aging characteristics of Tefzel. Two series of long term,

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;j tests demonstrated the excellent aging properties of Tefzel. The

' r/ - h, first test was performed in accordance with the Arrhenius method 3$ as described in IEEE Standard No. 1. Samples were aged up to f,.,h i 10,000 hours at 135,150,165 and 180 C. Physical properties dN (tensile strength and elongation) } vere measured. The resultant { [ d!.),; elongation plots at various To retention values were considered to be if.llC liberal by DuPont. lh{hh'.. Since Tefzel is used as an insulation on a conductor and that these . g;gljt.,., ?f.g insulated conductors are tested in the LOCA test, tests performed f.g, on wires were felt to be necessary. In their second series of tests, b.'y % ' DuPont performed two " functional tests" involving insulated wire D which, either prior. to and/or during testing, is bent around a (1) .i':,"; ' 3/4" mandrel, or (2) 1 x OD mandrel. For further details see ,k ' "Tefze1@ ETFE Fluoropolymer: Temperature Rating and Functional i. y9 Characterization", J. C. Reed and J. R. Perkins, 21st International 'Qs. :i. Wire L Cable Symposium, December 6,1972. Results from these .. e., 7.. = . i. >. M.e ..n funcational tests were more conservative. l ';... .M C'J . i'f.&f. ' 1 1 .. $p.c. .] '4;f j'4 :lj)?g. plot shown in Figure I was developed. In DuPont's own LOCA test s .s By combining the results from both series of tests, the Arrhenius ',,]53.ll . f!pC g .'.j }g-( ' programs, thermal aging periods of 504 hours at 160 C and 168 hours .) 32 t' at 180 C were chosen. For testing performed on Okozel insulated h I. ' 5 - l( wire and cable.168 hours at 180 C was chosen. This point is above ,T'"d h g the parallelline going through the 40 year point at 90 C. A line parallel to the 40 year 90 C line, d rawn through the 180 C,168 hour .ik 'g.( ~ v.g.,i point, would intersect the 40 year line at approximately 97 C. . ;.;g.p,.{,

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fH'3 OKONITU COMPANY i /. SECTION II y, j. c LOSS OF COOLANT ACCIDENT TESTING N ...s... ~ \\ 'r' Samples of Okozel insulated wire and cable were subjected to a Design Basis L' Event - Loss of Coolant Accident Test. Testing was performed in accord- . [ 7, ' .ance with IEEE Standards 383-1974 and 323-1974. In addition to the tests ~ ,t, specified in these standards, additional electrical and physical tests were t ' W' administered to each sample throughout the test profile. $.h ' The constructions tested were as follows:

  • ?P'W (A) 1/C #16 AWG (19 X) tinned copper,.015" Okoz. l s..

e ,M} ',, 2 samples unaged 5,. 2 samples thermally aged ! ~ y. s -~ h f,,,, (B) 3/C #16 AWG (19 X) tinned coppe'r,. 015" Okozel,. 003" x. 750" wide y/, g,' aluminum paper tape 20% lap,. 025" Okozel jacket OD - 0. 233" ' ':jf ';, 1 sample unaged ', p),ip '.. 1 sample thermally aged ...v.,.:.,n - J, The thermal aging period was one week at 180 C in a forced draft circulating , ], ' .iy'. air oven. Thermal aging was in accordance with the Arrhenius method

'.', 9-described in Section I of this paper.

,; t e. - The unaged and thermally aged samples were then exposed to 200 megarads of ' A,- gamma radiation. Fifty megarads simulated the maximum normal radiation i p' }, which the samples may experience during their designed life. The remaining ~-

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150 meagards simulated one DBE-LOCA incident. < g..,.7 .%y .,[;,a .D ' After irradiation, the sampics were installed in a test vessel, electrically 2 amps), and subjected to the LOCA temperature / pre .,: I,f, ,[g,~ j' loaded (600 volt, 20 (,';fy$. profile as shown in Figure 2 This profile is based on postulated LOCA in- '. pip,'. cident (combined PWR/BWR) as given in Figum A-1, Appendix A, IEEE Std. .,). t.;,, t.. 323-1974 The test profile was extended to 130 days to provide a margin of f.1/.!, } {}1 -. ;.Yi assurance.

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[f , f;; At the 30 day point the test vessel was allowed to equilibrate to room tem-QI,ji,N' h,. perature at which time the sampics were removed. A " Post LOCA Simulation 'M.1,; Tes t" per parag raph 2. 4. 4 of IEEE Std. 383-1974 was performed on each hIf.3 This test requires that the samples be straightened and recoiled about'J,[,5l;( sampic. ., {0 a mandrel having a diameter equal to 40 times the outside diamet,er of the s ample. J >1 80 V/ mil ac is applied for 5 minutes. h'.h ..f 9 - i .i v, All four single conductor samples and eac'h conductor of the 3/C cables were ' ; n. - tested and passed. Charging currents (not a requirement of IEEE 383 or 323) 'O' l,. were all below 2mA. .e. [.fk 3 ~ 81,g,,[vd'l, ' ,L

TH] OK'2NI[ COMPANY g h y /f WMm CTMG SECTION II (Continued) j. n. Upon completion of the withstand tests the Okozel samples were subjected i. i. to ac rapid rise dielectric breakdown tests in accordance with ASTM D 149. J' Breakdown strengths ranged from 1200 to 1940 volts / mil which are 30 to 48 1/. times rated voltage.

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IEEE 323 requires that " methods of adequate margin" exist in the test. This f, ;.. margin of assurance is dcmonstrated in the Okozel qualification test by the .L '. 'l k.1%;."*. ' following facts: W . s.'.L.. ., M .:(kl.;. (1) All samples passed two Post-LOCA Simulation Tests, one at 30 day ,.3f,r-point and one after the entire 130 day profile. ~- .C,.* i., , jf,',f.. (2) Charging currents were very fow. t.{2,bplr .h q. p M s., (3) Insulation resistance values taken during the profile were wellin excess ,[iM[.,. of one megohm-1000 ft. except during the 341 F and 335 F plateaus . 8lf.) *f.. when the SIR dropped to a minimum value of 0. 21 megohms-1000 ft. v.%.w.: l; C,' (4) As described above the Okozel retained a high dielectric strength. ...U,. J 5.$:st.:' Test data to justify the above description of test procedures and test results y~d.' are availabic for audit by the purchaser of Okozelinsulated wire and cabic ' 4. t or by his authorized designates. ~ 'q. .[.,' Considering the length and severity of the test described above and the margin .l.3 'of assurance provided, these sampics are considered to have passed the DBE. f ?;E',. 7. LOCA Qualification Test as described in IEEE Standards 383-1974 and 323- .s K]*.j,.,. ' 1974 for the Class 1E Cables and are thereby qualified for nuclear power .,. ; j c. . generating stations. ,'f,7 _b N

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I-[@ ' O OKONITE. OMPANY t ~ Y ,: '}. 1Mfs i

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/ /. e ,,...,.. + s,.t. qc. t? i,.:. } .. f h.. .b.. /.,y, i. SECTION III

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d. N.,;y MOISTURE RESISTANCE

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..M :. -: s......, ..!;2 h:. .,,i?.- ..,: p.. Long term moisture stability is one of the essential factors ' j.,i,' in the selection of an insulation for many applications. It is ] not unusual for a power cable to be required to operate in .; f..

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,d ,' O * ' an environment alternately wet and dry. To determine the long term water stability of a cable, a sample insulated with > ". c.. a thin wall dielectric is immersed in water at an elevated I .' l'; temperature to accelerate the deteriorating effects of moisture. Monitoring the electrical properties provides an ~l. , ;, N,(. r;,,' indication of long term behavior. Based upon actual a 7,. experience with installed cables over many years, insulations ,. y?., which have the capability of withstanding total water immer- ' ',: 8 N. sion at 90 C should be capable of a life in excess of a generat- .. ',.'..2

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ing station's designed life in an environment of 100% humidity. c ~ . f, [@ ~ '.>.V'.c. Table I shows long term 90 C water immersion on 1/C #16 " i.'$ ' .. '. ~c.,.; AWG (19 X). 015" Okozel insulated wires. . i.. 'yg:;,;3 .,.g',... '.. ..s ,7.. . : :t,;%m... r 6'. s.: % - p a-s m. s., -as

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@ TH3 OKONITO COM58ANY l l o-TABLE I 4 h. Q p'l. . ~.. LONG TERM 90 C WATER IMMERSION

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Method: ICEA S-19-81, Section 6. 9. 2 except (1) testing extended, (2) ac withstand at 110 V/ mil at 90 C after electrical measure-ments, (3) 600 volts continuous stress applied. .w. 1 d[hff' .M Sample: 1/C fil6 AWG (19 X) tinned copper,. 015 Okozel (Ref.1-6, 486) 1 -Q r (A) 600 volts ac continuous stress e g/,'. f W (B) 600 volts de continuous stress . t,. ; h '7.t g t.. Measuring hverage of 3 Samples f (2,,,,,y l Time

Stress, A

B a };4 Period V / mil - SIC % PF SIR

  • SIC

% PF SIR * 's ;j /;,. 1 day 40 2.01 0.34 191,257 1.98

0. 22 164,262 3,7 fj

.-80 2.04 0.62 2.02 0.49 'e 'E.jp'.:t ;.'.

  1. . " ' I week 40

- 2.16 0,26 191,257 2.12 0.15 131,982 1;.'. 80 2.16 0.39 2.13 0.23 t 2 weeks 40 2.17 0.30 237,705 2.12 0.18 300,546 ~; ! N 80 2.17 0.44 2.13 0.28 ). y';. y- ',h.

  • 1 month 40 2.20 0.29 155,738 2.14 0,20 191,257 80, 2.21 0.43 2.14 0.30 153, 005 " f;.<.i/

.;q. r ,('.3 j'# 2 months 40 2.23

0. 37 218,579 2.14
0. 31

/*,. - 80 2.26 0.42 2.15 0.43 4: .Q,W -

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..s 3 months 40 2.24 0.26 221,994 2.17 0.29 278,916 6- . :fIh,' ' 80 2.24 0,35 2.17

0. 39

.; ff.'[, N. ,')$ Q. 4 months 40 2,26 0.29 236,403 2.18 0,33

  • 255,443 f.

j+. L 80 2.27 0.41 2.18 0,41 "!.:ii. Eh*'* . >d.'h'. ,,,.[W. 5 months 40 2.27 0.26 349,526 2.19

0. 21 519,126'!M" T,

80 2.28 0,37 2.19 0.26 ..'h.P.r i.. <,; -( .1.' % . ([ I" 6 months 40 2.28 0.27 61,191 2.20 0,20 2 59, 563 ' '[.:.

  • ' Yq, 80 2.29 0.47 2 20 0.25 r,.

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  • SIR measured after one minute at -500 volts dc

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/8 /[ //- TH3 OKONITti COMPANY % rw,.frsey cr.u.cs . F fi' SE ON IV i-

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..,. 7 - VERTICAL TRAY FLAME TEST - J dN,l'[.:. I

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IEEE STANDARD 383-1974 ..,. o;,g', ( ~" ' '. c. ..;5- . ~y' The flame test should demonstrate that the cabic does not propagate .y.; Criteria: [,- fire even if its outer covering and insulation have been destroyed in 't;,', the area of flame impingement. . f;? ' ". n:. .r...' Test Specimens: Test specimens are specified in the attached table. . t, t;c,.. Fire Test Facility and Procedure: The test shoul,d.be conducted in a naturally i.:. " M' h. - ventilated room or enclosure free from excessive drafts and spurious!.[* 'h',. </l,[?; air currents. The tray is a vertical, metal, ladder type tray, 3" l i,- deep,12" wide, and 8' higl. Multiple lengths of cable are ar. ranged,h; g.j; $ in a single layer filling at lpast the center six inch portion of the tray / 3 'kQ ' M.'k,. with a separation of approximately 1/2 the cable diameter between each cable. .(.i..L .h.

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The flame source is a gas ribbon burner manufactured by the American Gas Furnace Company -- 10" wide, 11-15 drilling ribbon type Cat. No. Di I 10 XIl-55 with a Venturi mixer Cat. No. 14-18 (2 psig max. ). The

  • r L y burner is mounted horizontally such that the flame impinges on the

,(k:.f specimen midway between the tray rungs and so that the burner face ~? T is 3" behind and approximately 2' above the bottom of the vertical { 7 ;' ; tray. Due to its uniform heat content, natural grade propane is C,.., preferred to commercial gas. g ...e 'j.- Under dynamic conditions, the propane pressure is -2. 6.i 0. 3 cm of,1 .,,s,' water at the supply side of the Venturi mixer. The air pressure is .,i.- i ';.i" set at 4. 310. 5 cm of water. If commercial gas is used the gas and,[.[ y, air pressures shall be -0. 9i 0. I and 5. 6I 0. 5 cm of water, '.7 J.i. ' respectively. In practice the flame length is approximately 15 inches '.('- long when measured along its path.

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n; The gas burner is ignited and allowed to burn for 20 minutes. The.,i .s

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impingement temperature is recorded throughout the test. ' Length G. - of time the flame persists after the burner is shut off (afterburn),. d W. -{,f,p Jacket char distance, and insulation damage distance are measured Q and recorded. ... r. - . u. Cables which propagate the flame and burn the total length of the il h!f.,h .' ' ~ Evaluation: tray above the flame source fail the test. Cables which self-extinguish') when the flame source is removed pass the test. Cables which continue ~ ,.4 * - to burn after the flame source is shut off should be allowed to burn in:... M '4f f.I order to determine the extent. .I ..t-):y;:;& \\, .. ta.

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..s.. ..y.8 Q..... - a 5.:.1 :.1plV .p&. y> , ;,. k.w. ,.;.;p..:.. y....

.,,,6 g TH 1 CKONIT OMPANY f nmm tm.,cy ama TA B LE II !.,i ... g.: .If fille TEST DATA SilMET . g.'E *i; ' 1.,. >.c=.. j - q. Test: IEEE Standard 383-1974, Pa rag raph '2. 5 i, - except at 210,000 BTU /hr. ..' I '- .t .a. f. Flame Sourcc: Itibbon-Gas Durner at 210,000 BTU /hr. .t I 8"*P" 3N #16 (7 X). 015" Okozel,. 003" Aluminum / Paper Tape J.I'. Cons t ruc t.mn: . 020" Okozel Jacket , f., ..n .s.....;. 'u. ..t - , w: -

4....'

r.i Test Time Flame Height, Inche s .. 'i i Minutes PD. 1 48 t'4 - 9 'p'..T ',. 2 54 ',4 3 36 1,: ,u - .=?.'.. 4 36 eld.. *,t. 1 e 'j,) * *. * .t. 6 7 8 .p 9 ,s s;. p4 10 - i; "I,I,,p nii N. }} w. .s:. 12

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. ' '. :y t u. .~3 13 ' : "t - 14 'e' * .;.s.g. ~- 15 i ' j.T? !/

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.;m q. .... V.. 16 ~ v.s - .b<,iv. I 17 ,y..g .,,. nf ao .f.,;.g IB 1 v, V ....f b'.f ~,g.jw .hg Ih S

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20 36 w- ';{ 97. 1 't , s ~ v s, Afterburn, min : see None Jacket Damage, inches 44 Core Damage, inches 34 e 1)r opaga te No

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