In　this　paper,　our　home-developed　lattice　code　NECP-CACTI　has　been　implemented　into　our　UNICORN　code　to　perform　sensitivity　and　uncertainty　analysis　for　the　lattice　calculations.　The　verified　multigroup　cross-section　perturbation　model　and　methods　of　the　sensitivity　and　uncertainty　analysis　are　established　and　applied　to　different　lattice　codes　in　UNICORN.　As　DRAGON5.0　and　NECP-CACTI　are　available　for　the　lattice　calculations　in　UNICORN　now,　the　effects　of　different　neutronics　methods　(including　methods　for　the　neutron-transport　and　resonance　self-shielding　calculations)　on　the　results　of　sensitivity　and　uncertainty　analysis　were　studied　in　this　paper.　Based　on　NECP-CACTI,　uncertainty　analysis　using　the　statistical　sampling　method　has　been　performed　to　the　burnup　calculation　for　the　fresh-fueled　TMI-1　assembly,　propagating　the　nuclear-data　uncertainties　to　k(infinity)　and　two-group　constants　of　the　lattice　calculation　with　depletions.　As　results　shown,　for　different　neutronics　methods,　it　can　be　observed　that　different　methods　of　the　neutron-transport　calculation　introduce　no　differences　to　the　results　of　sensitivity　and　uncertainty　analysis,　while　different　methods　of　the　resonance　self-shielding　calculation　would　impact　the　results.　With　depletions　of　the　TMI-1　assembly,　for　k(infinity),　the　relative　uncertainty　varies　between　0.45%　and　0.60%;　for　two-group　constants,　the　largest　variation　is　between　0.35%　and　2.56%　for　v　Sigma(f,2).　Moreover,　the　most　significant　contributors　to　the　uncertainty　of　k(infinity)　and　two-group　constants　varied　with　depletions　are　determined.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.