ML20050D003
| ML20050D003 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| 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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b' . QUA,LIFICATION OF OKOZEL INSULATED WIRE AND CABLE . C. , for b- NUCLEAR PLANT SERVICE , 1:. ?. i; 'f;;. -
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a:A.1..r Qualification for nuclear pla,nt service has been L.. t l.f:
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" i[. performed at Okonite on sarpples of Okozel(Tefzel) -
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, . .j insulated wire and cabic. This insulation is fully capabic of meeting all the aging, radiation, moi's -
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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 . a
. nuclear plant applications.
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' Index . ..
s, . ','.' (. Section Title
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I Thermal Aging .;,f,. .
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. 11 . Loss of Coolant Accident Testing 's
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III Moisture Resistance *
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..' '. IV Vertical Tray Flame Test -
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Rcp. No. K-0-1 (Sept.1979) -
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TH'] OKONITE COMPANY
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SECTION I - g.'[%
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..~- . THERMAL AGING .o s .
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',.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 , , ,
tests demonstrated the excellent aging properties of Tefzel. The ' r/ - (ljl.{:;j - h, first test was performed in accordance with the Arrhenius method ' 3$ as described in IEEE Standard No. 1. Samples were aged up to -- ' *. 10,000 hours at 135,150,165 and 180 C. Physical properties f,.,h i . dN (tensile strength and elongation) } vere measured. The resultant elongation plots at various To retention values were considered to be , { [ d!.),; if.llC liberal by DuPont. lh{hh'.. ' Since Tefzel is used as an insulation on a conductor and that these
.?fg;gljt., .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 ..<'
"Tefze1@ ETFE Fluoropolymer: Temperature Rating and Functional i.
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Characterization", J. C. Reed and J. R. Perkins, 21st International y9 '-
=
'Qs . :i. - Wire L Cable Symposium, December 6,1972. Results from these . . e. , 7. . -
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funcational tests were more conservative. M.e
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g By combining the results from both series of tests, the Arrhenius
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- plot shown in Figure I was developed. In DuPont's own LOCA test ', ,]53.ll,
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- programs, thermal aging periods of 504 hours at 160 C and 168 hours .'.j 32 at 180 C were chosen. For testing performed on Okozel insulated .) '.
t' wire and cable.168 hours at 180 C was chosen. This point is above I. h - ' 5 l( ,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.(
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v.g.,i point, would intersect the 40 year line at approximately 97 C. . ;.;g.p,.{,
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i -- #9" [ . SECTION II y , j. c
.- LOSS OF COOLANT ACCIDENT TESTING N
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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- l
.ance with IEEE Standards 383-1974 and 323-1974. In addition to the tests
~
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specified in these standards, additional electrical and physical tests were t
,t,
' W' administered to each sample throughout the test profile.
$.h ' The constructions tested were as follows: .
*?P'W (A) 1/C #16 AWG (19 X) tinned copper, .015" Okoz.e l s..
2 samples unaged
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5 ,. ', , , 2 samples thermally aged '
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h f,,,, (B) 3/C #16 AWG (19 X) tinned coppe'r, . 015" Okozel, . 003" x . 750" wide y/, g ,' aluminum paper tape 20% lap, . 025" Okozel jacket OD - 0. 233"
';':jf '; , 1 sample unaged
', p),ip ' . . 1 sample thermally aged
.. .v. ,.:. ,n - .
, J, The thermal aging period was one week at 180 C in a forced draft circulating , ], '
.iy' .
. air oven. Thermal aging was in accordance with the Arrhenius method
;;'.', 9-described in Section I of this paper. ,; t e, . -
The unaged and thermally aged samples were then exposed to 200 megarads of ' A ,- gamma radiation. Fifty megarads simulated the maximum normal radiation i p' },
, which the samples may experience during their designed life. The remaining ~-
*)l , ;
. 150 meagards simulated one DBE-LOCA incident.
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.%y .D ' After irradiation, the sampics were installed in a test vessel, electrically 2 . ,[;,a loaded (600 volt, 20 amps), and subjected to the LOCA temperature.,:/ I,f,
, ' , pre j'
,[g,~ profile as shown in Figure 2 This profile is based on postulated LOCA in- '. pip,'.
(,';fy$.323-1974 t.. cident (combined PWR/BWR) as given in Figum A-1, Appendix A, IEEE Std. The test profile was extended to 130 days to provide a margin of.,). t.;,, f .1/.!, assurance. ;,{. [f
}, {}1 f;; At the 30 day point the test vessel was allowed to equilibrate to room tem-
, - . ;.Yi -'
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 sampic. This test requires that the samples be straightened and recoiled about'J,[,5l;( hIf.3
., {0 having a diameter equal to 40 times the outside diamet,er !of the saample.
mandrel , , . .
>1 J ... .i 80 V/ mil ac is applied for 5 minutes. ,
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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. . 1
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TH] OK'2NI[ COMPANY g ' WMm CTMG h y /f _ SECTION II (Continued) j. ,
- n. ..
- i. Upon completion of the withstand tests the Okozel samples were subjected ,
- 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.
- i p*.L l.. 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 .
W k.1%; ."*. . following facts: -
' . 'l
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., M (kl.;. (1) All samples passed two Post-LOCA Simulation Tests, one at 30 day point and one after the entire 130 day profile. .;
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, jf ,',f.. (2) Charging currents were very fow. ',
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p M s., (3) Insulation resistance values taken during the profile were wellin excess of one megohm-1000 ft. except during the 341 F and 335 F plateaus
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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. ~
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.[ .,' Considering the length and severity of the test described above and the margin
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'of assurance provided, these sampics are considered to have passed the DBE .
f7.?;E', . LOCA Qualification Test as described in IEEE Standards 383-1974 and 323-
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1974 for the Class 1E Cables and are thereby qualified for nuclear power : , K]* .j ,. , . ' ,'f,7
., . ; j c. . generating stations. ..
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p0 ;r e ! .'!" Ov MOISTURE RESISTANCE 4}4A..- a ,E,* ,
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.. ,: p . . ' Long term moisture stability is one of the essential factors
' j .,i,' in the selection of an insulation for many applications. It is ] . .,
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. not unusual for a power cable to be required to operate in .; f. .
,d an environment alternately wet and dry. To determine the ,' O long term water stability of a cable, a sample insulated with .
>.' l';". c.. .
a thin wall dielectric is immersed in water at an elevated temperature to accelerate the deteriorating effects of I
','. moisture. Monitoring the electrical properties provides an ~l.
r;, ,' indication of long term behavior. Based upon actual , ; ,aN,(. 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 c~
- g. ,;., . . . . . . ing station's designed life in an environment of 100% humidity.
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Table I shows long term 90 C water immersion on 1/C #16 " i.'$ '
. AWG (19 X) . 015" Okozel insulated wires. . . ' . ~c .,.;
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LONG TERM 90 C WATER IMMERSION .
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h,' . 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.
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.M Sample: 1/C fil6 AWG (19 X) tinned copper, . 015 Okozel (Ref.1-6, 486) 1 d[hff'
-Q e r (A) 600 volts ac continuous stress g/,'
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(B) 600 volts de continuous stress . . g t.. hverage of 3 Samples h '7.t f Measuring a (2,, ,,,y l Time Stress, A B .
's
};4 Period V / mil - SIC % PF SIR
- SIC % PF SIR *
;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
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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 ~; !
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- 1 month 40 2.20 0.29 155,738 2.14 0,20 191,257
,, 80, 2.21 0.43 2.14 0.30
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,('.3 j'# 2 months 40 2.23 0. 37 218,579 2.14 0. 31 153, 005 " f;.< .i/
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80 2.26 0.42 2.15 0.43 c. 4:
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-' 3 months 40 2.24 0.26 221,994 2.17 0.29 278,916 '
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80 2.24 0,35 2.17 0. 39 .; ff.'[, N. '
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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' . 5 months 40 2.27 0.26 349,526 2.19 0. 21 519,126'!M"
,,T,,.[W. 80 2.28 0,37 2.19 0.26
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. ([ 6 months 40 2.28 0.27 61,191 2.20 0,20 2 59, 563 ' '[.:.
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. .- ,.. 80 2.29 0.47 2 20 0.25 ,
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- SIR measured after one minute at -500 volts dc
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VERTICAL TRAY FLAME TEST - J dN,l'[ ;p, . s '
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IEEE STANDARD 383-1974 . . ,. o;,g' ( ,
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. ~y' The flame test should demonstrate that the cabic does not propagate
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Criteria: [,- fire even if its outer covering and insulation have been destroyed in 't;,', the area of flame impingement. . f;?
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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 .: .
ventilated room or enclosure free from excessive drafts and spurious!.[*
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air currents. The tray is a vertical, metal, ladder type tray, 3" l i,-
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. deep,12" wide, and 8' higl3 . Multiple lengths of cable are ar. ranged ,h; g.j;
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in a single layer filling at lpast the center six inch portion of the tray / , ' M.'k, . with a separation of approximately 1/2 the cable diameter between , '. each cable. ': .
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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. I 10 XIl-55 with a Venturi mixer Cat. No. 14-18 (2 psig max. ). The
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; 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
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'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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a ,'01,.- - . n; The gas burner is ignited and allowed to burn for 20 minutes. .s
;.k. impingement temperature is recorded throughout the test. ' Length The.,i
G. - of time the flame persists after the burner is shut off (afterburn), . d W. Jacket char distance, and insulation damage distance are measured Q and recorded. -{ ,f,p
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.' ' ~ Evaluation: Cables which propagate the flame and burn the total length of the il h!f.,h
..' 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 order to determine the extent. .I ..t .': '4f f.I
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Test: IEEE Standard 383-1974, Pa rag raph '2. 5 ';,- i
...t i, - except at 210,000 BTU /hr. . .' I '- .
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- f. Flame Sourcc: Itibbon-Gas Durner at 210,000 BTU /hr. <
... . .t 8"*P" I 3N #16 (7 X) . 015" Okozel, . 003" Aluminum / Paper Tape ,.
,; f., Cons t ruc t.mn: . 020" Okozel Jacket - . . .. J.I'.
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r .i - Test Time Flame Height, ..-
. . 'i i Minutes . Inche s PD.
48 1
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54 2 9 'p'.
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3 36 .
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4 36 :. .
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! Afterburn, min : see None Jacket Damage, inches 44 e Core Damage, inches 34 1)r opaga te No
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