ML23115A084
| ML23115A084 | |
| Person / Time | |
|---|---|
| Site: | 07103035 |
| Issue date: | 04/03/2023 |
| From: | Boyle R, Neely R Edlow International Co, US Dept of Transportation (DOT), Office of Hazardous Materials Safety |
| To: | Division of Fuel Management |
| Shared Package | |
| ML23115A059 | List: |
| References | |
| 001794, EPID L-2023-DOT-0006 | |
| Download: ML23115A084 (4) | |
Text
Out l i ne of Desi gn Approval f or Nucl car Fuel Transport Package usi ng Type J RC-80Y-20T Transpo Cont ai ner
Out l i ne Thi s t ransport cont ai ner has been used f or t ransport i ng spent f uel s f ro l rcscarch react ors t o t he UoS. si nce 1981( manuf act ured i n 1981) and has sO f ar been used f or t ranspohat i on whi l e t aki ng necessary t i censi ng procedures such as havi ng peri odi cany renewed t he approval peri od and appl yi ng f or approval amendmef or addi t i on of cont cnt s( spent f uel ).
Wi t h domest i c adopt i on of t he 2018 edi t i on of I AEA' s``Regul at i ons f or t he Saf e Transpoi of Radi oact i vc Mat eri al, "t he regul at i ons i ncl udi ng t hose known as Out si de Transport Regul at i ons were revi sed on J anuary l, 2021 t o add consi derat i ons of agi ng duri ng t he st orage of t ranspo cont ai ners and duri ng t he use of nucl ear f uci t ranspo package( wi t h t he cont ent s l oaded i n a t ransport cont ai ner) I n accordance wi t h t hi s revi si on, ve deci ded t o add a descri pt i on of t he resul t s of t he consi derat i ons and eval uat i ons of agi ng i n t he at t achment whi ch expl ai ns saf et y( an i t em t o be desct t bed i n an at t achment ) and t O del et e he regi st ered cont ent s whi ch woul d not be t ranspohed i n t hc f ut ure and appl y f or t he regi st rat i on. I n addi t i on, i t was deci ded t hat t hi s apphcat i on was t o be submi t t ed as a new appl i cat i on( appl i cat i on f or desi gn approval ) i n aCCOrdance wi t h t he gui dance f rom t he Nucl ear Regul l on Aut hori t y.
I t i s not necessary t o consi der t he del et i on of t he regi st ered cont ent s and t he agi ng ef f ect s, i n coni l l l l i ng comphance wi t h t he t echni cal ct eri a, and t heref ore t he resul t s of hese saf et y anal yses
( St ruCt ural anal ysi s, t hel l l l al anal ysi s, cont ai nment anal ysi s, shi el d anal ysi s, and cri t i cal i t y anal ysi s) remai n unchanged.
- 1. Del et i on of t he regi st ered cont ent s t hat wi l l not be t ranspohed i n t he f ut ure Curel cont ent s 7 t ypes Cont ent s i n t he f ut ure 3 t ypes Largest among t he cont ent s J RR 3 Si l i ci de St andard Type Fuel El ement Spent Si l i ci de St andard Type Fuel El ement Wei ght, gamma source st rengt h9 et c.
J RR-3 Si l i ci de Fol l ower Type Fuel El ement Spent Si l i ci de Fol l ower Type Fuel El ement J RR-3 Al umi ni de St andard Typc Fuel El ement Del et ed
Decay heat RR-3 Al umi ni de Fol l ower Type Fuel El ement Del et ed
J RR-4 Low Enri ched Fuel El ement
( LEU)
Del et ed
Neut ron source st rengt h per uni t l engt h J RR-4 Hi gh Enri ched l nst t ument at i on Fuel El ement ( HEU)
Del et ed RR-3I NU Fuel Spent WI NU FucI
) Though t he regi st rat i on as cont ent s i s del et cd, paramet er val ues of t he f uel el ement used i n t he saf et y anal ysi s are uscd as conseat e desi gn val ues.
- 2. Consi derat i ons of Agi ng of Nucl ear Fuel Transport Package l n order t o renect t he rcvi si ons of Rul es on Transport i ng Nucl ear Fuel Mat eri al s ct c. out si dc t he Pl ant or Pl ace of Busi ness"and`l Not i ce on t he Det ai l s of Techni cal St andards f or Transport of Nuct ear Fuel Mat eri al s et c, out si de t he Pl ant or Pl ace of Busi ness' ' ( f or t hOSe ef f ect e by J anuav l, 2021), an eVal ut t i on of he assumed usage condi t i ons duri ng t he se i ce hf e and he subsequent agi ng was conduct ed and t he resui t s are descri bed i n W( I I )
F. Consi derat i ons of Agi ng of Nucl ear Fucl Transpon PackageW i n Appendi x-1.
Agi ng was eval uat cd assunl i ng t hat t he peri od of use i s 70 years, a t ransport cont ai ncr i s used once ayear, and a t ransport at i on peri od per t ransport i s 365 days f rorl a conse at i ve vi evpoi nt.
Agi ng f act ors t o be consi dered f or t hi s t ransport cont ai ner were heat, radi at i on, chemi cal changes, and f at i gue due t o repet i t i ve l oads, whi l e mat eri al s consi dered f or agi ng were st ai nl css st ecl ( body, 1l dbaskct ), neut rOn absorber and al umi num a1l oy.
( 1) St ai nl ess st eel St ai nl ess st eel i s used as t he st ruct ural st rengt h member of t hi s t ransport cont ai nei Agi ng assumed i n t hcl l l l al degradat i on may degrade t he mechani cal charact eri st i cs due t o hi gh t emperat ure embrml eme, such as creep( def Ol l l at i on), caused by exposure t o hi gh t emperat ure envi ronment s. I I owever, based on t he resul t s of t hel l l l al anal yses, t he maxi muni t emperat ure duri ngt ranspoHt t i on i s about l °C, whi ch i s bcl ow t he t emperat ure at whi ch t he st rengt h coul d change due t o creep et c. ( 425° C), sO t here i s no need t o consi der t he ef f ect of agi ng i n coni l i l l i ng comphance wi t h t he t echni cal cri t eri a.
Agi ng assumed i n radi at i on degradat i on may af f ect t he mechani cal charact eri st i cs due t o changes i n mat eri al organi zat i on( embri t t l ement ct c. ) cauSed by neut ron i radi at i on. However, he mamum dose of neut n wi l i be on t he order of l n/cm2whi ch i s bel ow t he dose of 1016 n/cm2whi ch mat eri al organi zat i on coul d change( embri t t l ement et c. ). Thercf ore, t here i s no need t o consi der t he ef Fect of agi ng i n coni l l l l i ng comphance wi t h t he t echni cal cri t eri a.
Agi ng assumed i n chemi cal degrt t at i on may af f ect he mat eri al st rengt h and cause embri t t l ement due t o corosi on, Howevet st ai nl ess st eel i s a mat eri al hat f orms a passi ve i l m
on i t s surf ace and does not coode easi l y, and t he dept h of coosi on i n t he ai r i s est i mat ed t o be l m( 0. 001 mm) per year and a maxi mum of O. 07 mm duri ng t he peri od of use, whi ch i s a negl i gi bl e amount of corosi on compared t o t he t hi ckness of t he member( apprOmat el yl l mm f or t he body of a t ranspon cont ai ner). Theref Ore, t here i s no necd t o consi der t he ef f ect s of agi ng i n conf l ral i ng comphance wi t h t echni cal cri t cri a.
Agi ng assumed i n f at i gue degradat i on l nay cause a f at i gue f ai l ure due t o repeat ed l oadi ng. For a hi i ng devi ce( mai n bOdy hf t i ng i t t i ngs) t he f requency of i t s uses per yeari s assumed t o be100 t i l nes, and t he real st i c f requency of cxpect cd l i ni ngs duri ng t he pcri od of usc i s 7, 000 t i mes, but t he f requency of l i ni ngs f or conf bl l l l ance t o t echni cal cri t eri a i s conservat i vel y assumed t o be 10, 000 t i mes. Si nce t he repeat count of 10, 000 t i mes covers t he expect ed f requency of uses, t he repeat count i s conseat i vel y set i n conduct i ng f at i gue eval uat i ons. I n addi t i on, assunl i ng t hat a cont ai nment dece( cont ai ner body, l i d, and hd t i ght eni ng bol t ) i S handl ed 4 t i mes per year, a repeat count wi l l be 280 t i l nes i n 70 years, but i t i s conse at i vel y set at 300 t i nl es f or compl i ance wi t h t he t echni cal cri t eri a. Si nce t he repcat count of 300 t i l nes covers t he expect ed f requency of uscs, t he repeat count i s conse at i vel y set i n conduct i ng f at i gue eval uat i ons.
( 2) Neut ron absorber Neut ron absorbers are used t o mai nt ai n t he subcri t i cal i t y of a t ranspo package. Agi ng assumed i n t hel l l l al degradat i on may degrade t he f unct i on f or mai nt ai ni ng t he subcri t i cal i t y due t o changes i n t hc mat eri al organi zat i on caused by exposure t o hi gh t emperat ure envi ronment s.
However, based on t he resul t s of t hel l l l al anal yses9 t he maxl l l nun t emperat ure duri ng t ransport at i on i s about l l ° C, whi ch i s bel ow t he t emperat ure at whi ch t hi s mat eri al mei t s
( 2450° C). Theref ore, t here i s no need t o consi der t he ef f ect of agi ng i n coni l l l l i ng compl i ance wi t h t he t echni cal cri t eri a.
Agi ng assumed i n radi at i on degradat i on may degrade t he f unct i on f or mai nt ai ni ng t he subcri t i cal i t y due t o depl et i on of 10B caused by neut ron i rradi at i on. However, even on t he conseat i ve assumpt i on t hat t he peri od of use i s 100 years, t he maxi l nurl dose of neut ron wi l l be ont he orderof I I l n/cm2, and t he depl et i on of 10B i s est i mat ed t o be about O. 00013%, whi ch i s a negl i gi bl c amount. Theref ore, t hcre i s no nccd t o consi der t he ef f ect of agi ng i n coni mi ng comphance wi t h t he t echni cal cri t eri a.
Agi ng assumed i n chel i cal degradat i on may dcgrade t he f unct i on f or mai nt ai ni ng t he subcri t i cant y due t o corosi on. However, si nce i t i s i n a seal ed space i nsi de t he basket part i t i on
( St ai nt ess st eel ) and dOes nOt come i nt o cont act wi t h t he out si de ai t coosi on does not occu Theref ore, t here i s no necd t o consi der t he ef f ect s of agi ng i n conf l l l l i ng comphance wi t h t echni cal st andards.
( 3) Al umi num al l oy( spaCer)
Al umi num al l oy i s used as spacers and heat t ransf er component si n Fol l ower Type Fuel l oadi ng.
Agi ng assumed i n t hel 1l al degradat i on may af f ect heat t ransf er perf oI ance due t o changes i n t he mat eri al organi zat i on caused by exposure t o hi gh t emperat ure envi ronment s. However, based on t he resul t s of t herl nal anal yses, he maxi mum t emperat ure dui ng t ranspo at i oni sabout l °C, whi ch i s bel ow t he t emperat ure at whi ch t hi s mat eri al mel t s( 660° C). Theref ore, here i s no need t o consi der t he ef f ect of agi ng i n coni 111ng compl i ance wi t h t he t echni cal cri t eri a.
Agi ng assumed i n radi at i on degradat i on may af f ect t he hcat t ransf er perf ol l l l ance due t o changes i n mat eri al organi zat i on( embri t t l ement et c
) cauSed by neut ron i radi at i on, Howevet he maxi mum doseof neut ronwi l i be ont heorderof I I l n/cm2, whi ch i s bel ow t he of 1021 n/Cm2 at whi ch mat eri al organi zt t i on coul d change( embri t t l ement et c. ). Theref ore, here i s no need t o consi der t he ef f ect of agi ng i n conf l l l l ng comphancevi t h t he t echni cal cri t eri a.
Agi ng assumed i n chcmi cal degradat i on may af f ect heat t ransf er perf ol l l l ance due t o corrosi on.
However, al umi num anoy i s a mat eri al t hat f ol l Hs an oxi de 114 0n i t S surf ace and i s resi st ant t o COOSi On, and i t wi l i be usedaner coni l l l i ng t hat t herere no abnol l l l al i t i es i n i t s appearance pri or t o shi pment. Theref ore, t here i s no need t o consi der t he ef f ect of agi ng i n coni mi ng COFnpl i ance wi t h t he t echni cal cri t eri a.
- 3. Mi scel l aneous Numbers of 8ures, t abl es and pages were modi i ed as some of t he regi st ered cont ent s were del et ed.