Critic a lity b e nc hma rk o f the Mo lte n Sa lt Re a c to r E - PowerPoint PPT Presentation

Critic a lity b e nc hma rk o f the Mo lte n Sa lt Re a c to r E xpe rime nt Ma ssimilia no F ra to ni | Unive rsity o f Ca lifo rnia , Be rke le y Mo lte n Sa lt Re a c to r Wo rksho p 2017 | K e y T e c hno lo g y a nd Sa fe ty I ssue s fo r MSRs Oc to b e r 3, 2017

A pe e r-re vie we d re a c to r physic s b e nc hma rk fo r mo lte n sa lt te c hno lo g ie s is unde r de ve lo pme nt ¡ DOE NE a wa rde d a n NE UP to UC Be rke le y, in c o lla b o ra tio n with ORNL a nd the Gre no b le I nstitute o f T e c hno lo g y (F ra nc e ), to c re a te a n MSRE b e nc hma rk (Oc to b e r 2016) ¡ T he ta rg e t is to c re a te a b e nc hma rk fo r the I nte rna tio na l Re a c to r Physic s Be nc hma rk E xpe rime nt E va lua tio n Pro je c t (I RPhE P) ha ndb o o k ¡ pe e r-re vie we d se t o f re a c to r physic s-re la te d inte g ra l da ta ¡ use d b y re a c to r de sig ne rs to va lida te a na lytic a l to o ls fo r a dva nc e d re a c to rs ¡ use d b y sa fe ty a na lysts to e sta b lish the sa fe ty b a sis fo r o pe ra tio n o f a dva nc e d re a c to rs

T he b e nc hma rk is b a se d o n a se rie s o f sta rt-up ze ro -po we r e xpe rime nts (June 1965) ¡ An initia l c ritic a lity e xp e rime nt me a sure d the minimum a mo unt o f 235 U ne e d e d to re a c h c ritic a lity ¡ Me a sure me nts o f the d iffe re ntia l wo rth o f o ne c o ntro l ro d a s a func tio n o f p o sitio n with sta tio na ry a nd c irc ula ting sa lt ¡ Me a sure me nts o f the inte g ra l wo rth o f va rio us c o ntro l ro d c o nfig ura tio ns ¡ Critic a lity c o nfig ura tio ns o b ta ine d c ha ng ing 235 U c o nc e ntra tio n a nd c o ntro l ro d p o sitio ns; ¡ Me a sure me nts with sta tio na ry a nd c irc ula ting sa lt c o nd itio ns ¡ Me a sure me nt o f the who le c o re iso the rma l te mp e ra ture re a c tivity c o e ffic ie nt ¡ Me a sure me nt o f the p re ssure re a c tivity c o e ffic ie nt

T he b e nc hma rk is b a se d o n a se rie s o f sta rt-up ze ro -po we r e xpe rime nts (June 1965) ¡ An initia l c ritic a lity e xp e rime nt me a sure d the minimum a mo unt o f 235 U ne e d e d to re a c h c ritic a lity ¡ Me a sure me nts o f the d iffe re ntia l wo rth o f o ne c o ntro l ro d a s a func tio n o f p o sitio n with sta tio na ry a nd c irc ula ting sa lt ¡ Me a sure me nts o f the inte g ra l wo rth o f va rio us c o ntro l ro d c o nfig ura tio ns ¡ Critic a lity c o nfig ura tio ns o b ta ine d c ha ng ing 235 U c o nc e ntra tio n a nd c o ntro l ro d p o sitio ns; ¡ Me a sure me nts with sta tio na ry a nd c irc ula ting sa lt c o nd itio ns ¡ Me a sure me nt o f the who le c o re iso the rma l te mp e ra ture re a c tivity c o e ffic ie nt ¡ Me a sure me nt o f the p re ssure re a c tivity c o e ffic ie nt

Cre a ting a b e nc hma rk c o nsists o f two ma in ta sks ¡ Cre a te b e nc hma rk spe c ific a tio ns ¡ Re trie ve da ta a nd re la te d unc e rta inty ¡ Ma ke a ssumptio ns a s ne e de d ¡ T e st the b e nc hma rk ¡ Cre a te a nd run o ne o r mo re c o mputa tio na l mo de ls ¡ Asse ss unc e rta intie s

F ue l g e o me try

T o p c o mpo ne nts

Co ntro l ro ds a nd sa mple b a ske ts

Oute r c o re c o mpo ne nts

Co re mo de l H o rizo ntal c ro ss se c tio n o f the MS RE mo de l

Do we l se c tio n o f g ra phite la ttic e H o rizo ntal c ro ss se c tio n o f the do we l se c tio n o f the graphite lattic e

T a pe r re g io n H o rizo ntal c ro ss se c tio n o f the tape r re gio n

Co ntro l ro ds a nd sa mple b a ske ts H o rizo ntal c ro ss se c tio n o f the c o ntro l ro ds and sample baske ts

Sa mple b a ske ts

Co ntro l ro ds

Overall model

T he b e nc hma rk mo de l wa s te ste d o n the first MSRE c ritic a lity e xpe rime nt ¡ F ue l sa lt c o mpo sitio n 65L iF -29.2Be F 2 -5ZrF 4 -0.8UF 4 (99.99% fo r 7 L i e nric hme nt). ue l sa lt d e nsity 145.3 ± 1.0 lb / ft 3 (2.3275 ± 0.0160 g / c m 3 ) ¡ F ¡ Ma ss fra c tio n o f 235 U in the sa lt is 1.408 ± 0.007 wt% ¡ Co re te mpe ra ture 1,181°F (638°C) ¡ One ro d wa s inse rte d a t 46.6 in. po sitio n, o the r two ro d s a t the ir uppe r limits k eff Case 100(C-E )/ E Be nc hmar k 1.0 - Calc ulate d 1.01276 ± 0.000098 1.276 (SE RPE NT 2, E NDF / B-VI I .1 c ro ss se c tio ns)

Gra phite de nsity is the ma jo r so urc e o f unc e rta intie s o n k e ff | D k| × 10 - 5 Ite m Nomina l a nd bounding va lue s (1.87 ± 0.02) g / c m 3 349 Gra phite de nsity (2.3275 ± 0.0160) g / c m 3 83 F ue l sa lt de nsity (1.408 ± 0.007) wt% 235 U ma ss fra c tion in the sa lt 61 (8.7745 ± 0.0200) g / c m 3 9 INOR- 8 de nsity (166.446 ± 1) c m 19 Gra phite c ore he ig ht (70.168 ± 0.2) c m 13 Gra phite c ore ra dius (1.016 ± 0.127) c m 100 F ue l c ha nne l width (3.048 ± 0.127) c m F ue l c ha nne l le ng th 42 (0.01 ± 0.001) a t. % 6 L 174 i e nric hme nt (0.00008 ± 0.000008) wt. % 18 Boron c onc e ntra tion in g ra phite 39.687 c m (1 s = 4 c m) Outle t pipe he ig ht 31 0.819 c m (1 s = 0.08 c m) 29 Distributor thic kne ss re mo ve o ne I NOR-8 pla te 16 Sa mple ba ske t she ll dime nsion 0.06% (C ma ss fra c tio n), 0.08% 10 INOR- 8 c omposition T ota l (root me a n squa re ) 422

he la rg e st se nsitivity c o e ffic ie nts fo r k e ff fro m c ro ss T se c tio n da ta unc e rta intie s a re fo r C a nd 235 U Nuc lide T ota l E la stic sc a tte ring Disa ppe a ra nc e F ission -0.0286 0.0000 -0.0286 - L i- 6 0.0040 0.0165 -0.0139 - L i- 7 0.0251 0.0283 -0.0033 - Be - 9 0.0014 0.0018 -0.0006 - Zr- 90 -0.0060 0.0005 -0.0066 - Zr- 91 Zr- 92 -0.0007 0.0008 -0.0016 - Zr- 94 -0.0002 0.0001 -0.0005 - Zr- 96 -0.0006 0.0002 -0.0008 - F - 19 0.0749 0.0705 -0.0105 - C- na t 0.5212 0.3970 -0.018 - B- 10 -0.0064 0.0000 -0.0064 - 0.2386 0.0003 -0.1386 0.3768 U- 235 -0.0857 0.0056 -0.0921 0.0006 U- 238

Co nc lusio ns ¡ A se t o f b e nc hma rks b a se d o n the MSRE is unde r de ve lo pme nt ¡ T he e va lua tio ns will inc lude multiple b e nc hma rks fo llo wing the ze ro -po we r e xpe rime nts c a mpa ig n o f June 1965 ¡ A dra ft b e nc hma rk o f the first c ritic a lity o b ta ine d va rying 235 U c o nc e ntra tio n with ste a dy sa lt is unde r re vie w fo r inc lusio n in the Re a c to r Physic s Be nc hma rk E xpe rime nt E va lua tio n Pro je c t (I RPhE P) Ha ndb o o k ¡ I f yo u a re inte re ste d in the dra ft b e nc hma rk e ma il us: ma xfra to ni@ b e rke le y.e du

Ac kno wle dg e me nts I nte rna l E xte rna l E va lua to rs re vie we r re vie we r Adrie n Bida ud L uka Sno j Da n She n Ge rmina I la s Je ff Po we rs Gre no b le Jo ze f Ste fa n UC Be rke le y ORNL ORNL I nstitute o f I nstitute , T e c hno lo g y, Slo ve nia F ra nc e

Re fe re nc e s [1] Princ e , B. E ., Ba ll, S. J., E ng e l, J. R., Ha ub e nre ic h P. N., a nd K e rlin, T .W. Ze ro -Po we r Physic s E xpe rime nts o n the Mo lte n-Sa lt Re a c to r E xpe rime nt ORNL -4233, Oa k Ridg e Na tio na l L a b o ra to ry, Oa k Ridg e , T e nne sse e (1968) [2] Ro b e rtso n, R. C. MSRE De sig n a nd Ope ra tio ns Re po rt Pa rt I : De sc riptio n o f Re a c to r De sig n ORNL -T M-0728, Oa k Ridg e Na tio na l L a b o ra to ry, Oa k Ridg e , T e nne sse e (1965) [3] Brig g s, R. B. Mo lte n-Sa lt Re a c to r Pro g ra m Se mia nnua l Pro g re ss Re po rt ORNL -3626, Oa k Ridg e Na tio na l L a b o ra to ry, Oa k Ridg e , T e nne sse e (1964)