A core physics design and analysis of micro-modular lead cooled fast reactor (MMLFR) cores for autonomous ultra-long-life operation

Lee, Seungnam; Hong, Ser Gi

doi:10.1016/j.net.2025.103874

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A core physics design and analysis of micro-modular lead cooled fast reactor (MMLFR) cores for autonomous ultra-long-life operation

Lee, Seungnam;
Hong, Ser Gi

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초록

Minimizing core size with keeping an ultra-long-life operation cycle is very interesting for improving the inherent safety and sustainability of nuclear energy systems. Additionally, minimizing the excess reactivity change to less than 1 $f or t h es ma l l cor e i s v er y h e l p f u l t o mak e t h es ma l l n u c l e a r r e a c t or t o b es a f er b y r e m o v in g t h e p r o m pt cr i t i c a l a cc i d e n t an d t o mak e i t e a sy f or a u t o n o m o u so p er a t i o nb y minimi z in g t h e m o v e m e n t so f t h eco n t r o l r o d s . I n t hi s w or k, M i cr o - M o d u l a r L e a d - coo l e d F a s tR e a c t or (M M L F R) cor eso f 35 M W t ha r e n e u t r o ni c a l l y d es i g n e d b y u s in g t h es u p er bn e u t r o ni c p r o p er t i eso f t h e l e a d coo l an t an d co n s i d er in g s im pl e tw o - r e g i o n cor eso f d i f f er e n t f u e l co m p os i t i o n s . T h er es u l t so f t h e ana l y s i ss h o w e d t ha tt h e f ina l c an d i d a t ecor es ha v ecy c l e l e n g t h s l o n g er t han 30 E F P Y s (E f f ec t i v e F u l l P o w er Y e a r s) o v er w hi c h t h e b u r n u p r e a c t i v i t y s w in g s a r e l ess t han 1$ , achieve high burnups exceeding 58 MWd/kgHM, and possess all negative reactivity coefficients except for reactivity coefficients by coolant expansion. Also, it was shown that the final candidate cores can maintain the integrity of fuel rods from point of view of DPA, peak cladding and fuel centerline temperatures, and internal pressure and hoop stress for the fission gas plenum over the operation life.

키워드

Micro-reactor; Lead cooled fast reactor (LFR); MMLFR; Ultra-long-cycle; DPA; TEMPERATURE; STEELS

제목: A core physics design and analysis of micro-modular lead cooled fast reactor (MMLFR) cores for autonomous ultra-long-life operation

저자: Lee, Seungnam; Hong, Ser Gi

DOI: 10.1016/j.net.2025.103874

발행일: 2025-12

유형: Article

저널명: Nuclear Engineering and Technology

권: 57

호: 12

페이지: 1 ~ 13