ML11356A180

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New York State (NYS) Revised Pre-Filed Evidentiary Hearing Exhibit NYSR00140, L. A. Dissado and J.C. Fothergill, Electrical Degradation and Breakdown in Polymers, Iee Materials and Devices Series 9 (1992) Excerpted: P. 18-19. (Dissado)
ML11356A180
Person / Time
Site: Indian Point  Entergy icon.png
Issue date: 12/22/2011
From: Dissado L, Fothergill J
- No Known Affiliation
To:
Atomic Safety and Licensing Board Panel
SECY RAS
Shared Package
ML11356A173 List:
References
RAS 21612, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01
Download: ML11356A180 (3)
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OAGI0001268_00001 NYSR00140 Revised: December 22, 2011

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i.;.,.'". *... rOSSdu;Klng C:ro~slinki:n~* a linear polvrner 'prior to crvstaUiSiltion tllay eaUSe a nonnaUv

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senll"cfYSmlline p

.. *olyuler to lose iu crvs;UtHhlity, 'fhe 11]05(, (otrunonmethod J

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fJfcro.sslinking is to trigger a thernl~lU¥~'a(t1v*aled catalyst by raising the temperature, Siu,e this telnpenu:uremust be well al){lv{! tht.~ rndting t(:~nJv.

peratu.re if crosslinkhlg is to take phlce.in are~uorhtbl'Y short: titne, this f()rr:n of crnssli:nkingah¥ilYs takes place \\\\~hen the poiYlner is in its liquid state~ Le.

in the flm.orj]hoWf rndt phase,H the temperature IS raised very quickly then it rna)' he po~sibk; for th(; (~russlinking to nan before the lalTIt>.llae structure

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by the crossl.l.nks::. h seerns likely thal tbe latneH.fle '\\\\:il1not bt~ ~lblt' to att~j;in a full spheruHtk :SH\\u:ture in the ~)Hdstate, Under th(~s(~conditions in pnly:cthylene, or~le!'ed la.meUae n:1icro-dotnains1 '\\s.pheruli.tk preCUf$()f 1;,..

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spherulites arc sornetilues observ{~d in compre5$ion~*moulded thin.. Hlrn sped,.

r:rlen~H~,15 \\vhich have been ct()s:slinked in this waY'.. in $u(~h $]x~dm(~n:$ the

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oJ tIw mdt-ing point. For (~x~~mplt~* in tht~ $il~~nc~cn)$5Hnk1ng pr()c~ss dl~velol}ed for polyN-hyh:~nt~power c,able insul:H.iOt1; the polytner is, cured at apprnximatdy 1 O(Y"C. Thi~ is Ju.stbelo\\v the rnelting point of the lnore d

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are not nornnlH~' observed in this rnaterial arl(:l it seems1ikdy that the silane t

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linily and any original sphel'ulitic structure \\\\i'in be retained in thc$,ematerials provided they are not heated ahove their melting poinL L4S*ulk defects 1Mwffree volume yrheusual crystal defeC1Ei. such as disl(X'atirms, rnay be present LB polYlner crystals hut are difficult to* observe since tb{' r::ryslaUinity is only parti;dani.d OAGI0001268_00002

th(:'y af(:( O()t then.~h::n'(~ likdy to twdof:nin~lnL J\\:'bny rrystai deft~:ct~ ar'e uniqu(~

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CIT tIlt reguhlt chain iuaybe hltt<rrupted\\~'ith an incorrect raer {fot eX~Hnp!{~

a polypn;))Jylen:e unit rnayo*ccur ina J)oJyethykJtc chain g.iving riM~ [0 a uH.~thyJ group in a poly.;:;thykrw tT),':';laHitt.. Su*(h *d{'fe(Hi act to jn(Tt'fiM~ unit

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~.;Jud atrno'SF)heric ga5(~$ ",,:'hieh fl~~ve not diffu$t:~d ouL Sh:lce,di:ffusior1: is th{'~ 1'1.d UU}Vt;'Ulent of pani{Jes down a con cnH rat jon grrac:hent du{~ t(i i:h~ fandmn U1U\\'(;U'lenl of ind.h:*i.du~d partk.lc$~ thf:rt~\\\\;'in al.\\!i,'ays t~e S£.Hlle (indi\\'oiduar)\\'t)~ds *v\\:*hich (Jo not leave the polytner during tua;nuhu:::turc, Forexarnple Stevens ttaL'J.':l h41\\.'e found~ ttsing light scattering tedTniqu*es. j thaJ ;]:n epoxy resin they manufactured and de~gasst~((under extr*erndy strillge:nl conditi<ul:S :MJU contain*ed 1 0 ~ *~~-.... -... l 0 (J 'Itoi{i:s. nf.. Jwith dhtinm:c*t:s of :2 to 5 >:; It).. ?, Hl {Le, Rbnu( Hr'" nt tile lot,al\\'~:,luHle}, At tJu::

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