ML20151C615
| ML20151C615 | |
| Person / Time | |
|---|---|
| Issue date: | 06/09/1988 |
| From: | Derek Widmayer NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Surmeier J NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20151C617 | List:
|
| References | |
| FOIA-88-470 NUDOCS 8807220061 | |
| Download: ML20151C615 (16) | |
Text
{{#Wiki_filter:____ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 7______-________________________-___________________-____-_-________________________________
@ $ 1988
.. NEETING/ DAW /6/6/88
-1 HEMORANDUM FOR: John J. Surmeier, Chief Technical Branch Division of Low. Level Waste Management and Decomissioning, NHSS THRU: fiichael Tokar, Section Leader Technical Branch Division of Low-Level Waste Management and Decomissioning, NMSS FROM: Derek A. Widmayer, Civil Engineer Technical Branch Division of Low-level Waste Management and Decomissioning, NMS$
SUBJECT:
SUMMARY
OF JUNE 6, 1988 MEETING ON HDPE HICS Enclosed is a sumary of the June 6,1988 meeting held to discuss the preliminary draf t report entitled, "Review of the Structural Design of High Integrity Containers," prepared by Professor Stewart Silling of Brown University. ! Professor Silling ended his presentation on the report during the sneeting with the conclusion that the required knowledge for designing a high integrity container made with HDPE to be structurally stable for 300 years, "... goes i beyond what structural mechanics and polymer science can reliably provide." This t.onclusion was the focus of much of the discussion on the preliminary draft report during the meeting. If you have any questions regarding this memo or the riaterials I have relating to the meeting, please call me at x20505. Df 3*1 Sign 4 g Derek A. Widmayer, Civil Engineer Technical Branch , Division of Low-Level Waste Management ] and Decomissioning, HMSS 3
Enclosure:
Meeting Sucr.ary DISTRIBUTION: LIEN /5l NKSS r/f LLTB r/f4 RLBangart JGreeves MTokar DAWidmayer ! JKane KMcDaniel LYang,5GTR JLee,NER JPhilip,RES CMaupin, SAP l C :LLTB : : : : : : ! ....:..... ....:............:............:............:.....~......:............:........... , ! *E :DAWidinayer : : : : : : t A ' jiTE:06Q/88 7% g }l 0 v
. !" M }IC AL RECORD COPY ,
u-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Meeting Summary
Meeting on the review of the preliminary draf t report:
"Review of the Structural Design of High Integrity Containers" Date: June 6, 1988 Time: 1:00 pm 4
Location: NRC Headquarters, OWFN, 6 B13 Attendees: ~ R. Cangart NMSS/LLWM J. Greeves NMSS/LLWM M. Tokar NMSS/LLWM D. Widr.ayer NMSS/LLWM J. Kane NHSS/LLWM K. McDaniel HM!S/LLWM L. Yang NMSS/SGTR J. Lee NRR/SPLB C. Naupin SLITP/ SAP J. Philip RES/WMB , S. Silling, Brown University
- 2. Soo, Brookhaven National Laboratory Sumnary: The following sumarizes discussions at the meeting:
o NRC staff prescnted 'an overview of the High Density Polyethylene (HDPE) High Integrity Container (HIC) situation. This overview included discussions Brookhaven National of the HDPE Hic Top Laboratory BNL)(ical study Reports submitted conducted for review, on structural analysis of the of HDPE HICs, of problems with HDPE HICs identified by vendors and engineering firms, and of NRC actions resulting from the BNL study and the identification uf prcblems. o Professor Silling presented an overview of his preliminary draft report on the structural design of HDPE HICs. Professor Silling ended his overview with cenclusions on the designs of the HDPE HICs by the venders, and on the prospects for redesign. Discussions on the report focused on Professor Silling's conclusion that the required kncwlege for the design of a HIC rnade of HDPE that must be structurally stable for 300 years,"... goes l beyond what structural mechanics and polymer science can reliably provide." l A copy of the overheads that Professor Silling used during his presentation are attached. l 0 Meeting participants discussed the inerits of requesting a technical review of the report frcm the Advisory Comittee on Nuclear Waste (ACNW), options - for the next steps 'to take on the Topical Report reviews, and recomendations on the next steps to take on the continued disposal of HDPE HICs. hMSS , staff and HMSS cor tractors and consultants at the meeting supported the view j that structural mechantes and polymer science can not be used to reliably ! design HOPE HICs. It was al:e agreed that further discussion was needed ! regarding any actions concerning the disposal of HDPE HICs. o Specific connents made on the report by NRC Staff and Cr. 500. BNL, were discussed with Professor Silling. Changes and additions to the preliminary draft report were agreed to by the meeting participants. l ' I o The upcoming actions on the report and HDPE HICs were discussed, including:
- 1. Professor Silling will prepare the report as a draft report and transmit it to NRC by June 14, 1988,
- 2. NRC staff will distribute report to appropriate parties on June 14, 1988.
j 3. NRC staff and Professor Silling will present discussions at the AChW reeting to be held on June 27 and 28, 1988.
- l l
REVIEW OF THE STRU CTURAL DE St GNS OF t+1GH- INTEGRITY CONT AtWERS (HIC s) I
)
e 1 STE W AR.T A. S ILLI N G ' r5now w UM iVERS PY , I Ju.ne /, , l9 BB l-l i l l I t i i l l t
J.Jewtifie.J 7eoblem.s all a. rise Sow. *Lt use. of H3PE (kijk- Jewsiby yolyt.tkyleue) a s. tLe leal- bearin3 mierial : Vacer hinty .6.ut creep tropedies
. Possible brit:tle -(ai lu re.
- No design limits ow Je-foration Creep bu.ciclisj
C.R E E P Response of a. br stretc.ked h A. con staat lead: b b# 6 Sires 5 = dore t [c.res,5- Sectiona l a.redL E: 54 Ain = fra. talon 4( lewjth chasje (stretck) 3 gekeral typtS of bakAvier E lo stic respouse - time inJe peHJeaf, recoveable time permanent
= Pla stic re sponse - iw d e pen de n t,
. Creep ( viscoeta.sticity) - Aime JegewJewt strain wn d er- cow s4sa b le=J , po ssibly t ec.over ble s kr*In A c.reeP I
, & t}e.54,ic S krAiM ;
i tiMf f tw of load , app l ic44ien
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o o o o o o o o o o o o cn a3 W wa =O 'T M N " 4
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u Figure 2. Uniaxial creep curves for Marlex CL.100,25' C. e=
e s
- Creep Ys (Le p r e.J e wiw..ct woJe of J e form *Oen over tLe le=3 ferm. N west sola poly mers .
.rw jeweral t- b r e is no "4 Lee sko lJ 54.ress "
-fo r tLe a wset e-( cre ep ( Lw+ liwear.
low sivesus). vi sc o ela.54icil7way a.pply -for
- Marlex C L-LOO , 5 oo psi , 2.5*C,-
cre
10 #[o -[o r Very lo nj .
- d> Mu5t HAvC tESIGhl L '. :' iT S ON DEFoRMATioM l i
l l l . - - _-_- t t FMLURE OF t+I>P E (The o.lo ov e a.ss u *.e.J tht t-Le - terial does not fail , ) i Low 3 - 4:e r m. f ailwre of WDPE at 1o 4/ s(ress Offers . fro w, s Lort- ter m. at ki3 L stress, failu re ^ stress du.c. kilt failurt - g b/S tea sition skreues' ' be;Mie fahre
- : : ' time
$f 4 10 yr 100 yr 2.0 yr 7ressu.ritel extru Jed pipe J abs. , I(wear at>ve, e
- c. ( Grau b e ) . TLis Jak is useJ in tt* Jesil:* af Tirelines .
v T/B tra.wsikiew is ver y sensitive b: , (low T l.etter) Teurera.ture Molecular- waijkt (,k(3 k wei3 ki b etter-)
- Pre sence of -flaws, iwciv.Jiw3 micracrac.ks, i ururi bies Blay.iality of stres.s Cross liakiw3 ( caJi 4i.a da.maje (Jak s k e tc.ky ),
- Aprew+ trewJ . c rest. lia kiuj keles ur to a. r.iw+, thew A ur+s . - seas; 4;ve to me Ekol ,f c ro ssliw ki x3 -
- Fo.bric 4 tow ><tLed.
HIC d.e sij n ers diJ kot eveu consider ike effects of 41ise em H@7E. t CREEP 1,0 CicLt MCr
- E la.stic buckling s u.lden, I a.r3e Jefer 4i.n iw a.w clas4ic 54,ruciu re due io a.
c ri bical co m pre ssive lead , i C reep bu.cklin - sawe e b ed in A cyggpin structure , preveuk ', [or elaskic To Strucku re 5j caN es,ti - te cri6ic I l o a.1 -( prop rtio%I . to Wuw3's -.Julus E e-f the ute rie ( ) , For creer, u.se seca.m.t w Jwlus E3 (.t ) . 1 C e(fec41ve. W u=3's w dulus , Eis e Je r=w Je ut), l lo.J E5 ! Hu.Hiely c ribic.( elas tic by -fo r crili c< l creer I c a.J . ; I t h Ma rle x. e t- t o o , goo psi : creer buciclig ! Ioa.I is a b e -t. y of clasfit le=J. I . Analysis by HIC vewJers is all wrouj i 's ; no creer eneci cowdJer=J we o.rckia[,wrow$ leaJs ~' f*;ture wedes ( criti ca. l - wrow3 moJ e i s, cire nw. brew kia I) b u.c.k.li aj - au s u.b s taaki beJ c.reJR for wa.ste i cyper; =#u t s u4 we. ;m3 ful l l W arcklaj - A buried stenchre wkesc
- *eck wicEI s6inness eliffer5 from ,
i t La.4 ef .tke sil will supped e4. leal ; diflerent fr.% % 4 of tLe av er bar de n , i IMb4 IAk4!y e bOVf ik. ( ki352 S kFR f. k M Ffi th.cA " to.J. I 'i i i I l cftTEP BucKL.l @ LEAD 5 FoR. G DJE rt,t C H I C, A downward leal fy F.3 - PM ON STAbt.E STABt.E , > 1 Aeral le d fj 0.~5 P M sk Vt.y y Small ?v atttt41 - 6-- 4 s.- d.= p1 HIC 6- [j m n --a d.- M b W 7Tttti TV 1
- t
SUMMARY
~P e Si3n we tLods were very poor-IyereJ creep, x.Je t:Le west -{o.verable .
yessi ble a ssumpilens o.1. . 4. Oilure.
. Too k a.x op41 wistic view of radia.fiew 4
==3e. .
th4
.r p ered the m<tkoJ s kave W en Jeveloped fo r- Je sij a af bu.*ied s4rac.fures.
.T3xered need to li-M J e for%ti o n.
I i
- Took. an opimistic view of co llapse ,
l 4 )-
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PROSPECTS Fo R. REVESIGW
. ' Pro 41e => re of a fa-4.=ent f nat.u.re .
. No one kas ever o.ttemp ted 4. elesly an HDPE 5 hvac. lure b las t were W .= So yr, eveu w; tic t raJia.iten.
- It **y Sat ke possible b Jesip *.
i Hic witk Ht?E as % leal-keneinj u 4.evi I fr sco yr Ii(c.
. The re9 aired kwawleJy .f.c :back J e. sip
- 3.es bey.wJ wLd strue.twr 1 mec.L aics a.nl polyktr Scif kCC CAM Pf IIAbly previJg.,
l 3 l
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