Benchmark of ENDF/B-VII.1 and JENDL-4.0 on Reflector Effects
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1 1st Meeting of WPEC Subgroup 35 on Scattering Angular Distribution in the Fast Energy Range May 22, 2012 NEA Headquarters, Issy-les-Moulineaux, France Benchmark of ENDF/B-VII.1 and JENDL-4.0 on Reflector Effects Makoto ISHIKAWA Japan Atomic Energy Agency (JAEA) 1
2 C/E Value Summary of Benchmark Criticality C/E values by Monte Carlo calculation Exp.Core JENDL-4.0 ENDF/B-7.1 Specification Jezebel (PMF001) Ultra-smal, Pu, Bare, Pu240: 4.5at% Jezebel (PMF002) Ultra-small, Pu, Bare, Pu240: 20at% Flattop-Pu (PMF006) Ultra-small, Pu, Nat. U reflector, Pu240: 4.8wt% Godiva (HMF001) Ultra-small, Uranium, Bare, U235: 94wt% Flattop (HMF028) Ultra-small, Uranium, Nat. U reflector, U235: 93wt% FCA X Small, Pu+Enriched. Uranium, Dep. U blanket, Pu:28wt%, U235:12wt% FCA X Small, Pu+Enriched. Uranium, SS reflector, Pu:28wt% U235:12wt% JOYO Mk Small, Pu+Enriched. Uranium, Dep. UO2 blanket, Pu:17wt% U235:23wt% JOYO Mk Small, Pu+Enriched. Uranium, SS reflector, Pu:28wt% U235:12wt% ZPPR Large, Pu, Depleted U. blanket Pu:13wt% p.4,5 JENDL-4.0 p.10,11 p.7,8 ENDF/B ±0.2%Δk ( Exp.error )
3 Method of Sensitivity Analysis Cross-section sensitivity: dr / R Sm, x, g d / m, x, g m, x, g Contribution of each cross-section R ENDF R R JENDL JENDL S m where, R: core parameter, m: nuclide, x: reaction type, g: energy group number., x, g, ENDF m, x, g, JENDL m, x, g m, x g m, x, g, JENDL 3
4 Reflector Effect : (Bare -> Nat. U) Godiva Flattop-235 (HMF001) Ultra-small, Uranium, U235: 94wt%, Bare (HMF028) Ultra-small, Uranium, U235: 93wt%, Nat. U reflector 4
5 nu mu in mu n2n in nu mu in etc. total Reflector Effect : (Bare -> Nat. U) %Δk) Jezebel-239 Jezebel-240 Flattop-Pu Godiva Flattop U-235 U-238 Pu-239 Pu-240 Pu- 241 Isotope- and reaction-wise contribution to the keff C/E difference between ENDF-7.1 and JENDL-4.0 => The cancellation among in, (+) and, (-) of U-235 seems to make the reflector effect by ENDF-7.1 worse than JENDL-4.0 by 300pcm. 5
6 ENDF/B-7.1 vs. JENDL-4.0:U-235 U-235 U-235 U-235 U-235 6
7 Reflector Effect : (Dep.U blanket -> SS reflector) FCA FCA facility Fuel drawer and plates of FCA Cross-cut view of FCA X-1 Small core, Pu+Enriched. Uranium, Pu:28wt%, U235:12wt% FCA X-1: Dep. U blanket FCA X-2: SS reflector Two-dimensional RZ model of FCA X-1 7
8 in nu C/E value Reflector Effect : (Dep.U blanket -> SS reflector) J40 MVP J33 MVP 0.40% E70 MVP 0.30% E71 MVP 0.20% FCA X-1, % 0.00% -0.10% -0.20% -0.30% -0.40% -0.50% FCA-X-1 FCA-X FCA X-1 FCA X % -0.70% keff C/Es of FCA X-1 and X-2 Na Al Cr-52 Fe-56 Fe-57 Ni-58 Ni-60 U235 Pu239 Others Total Isotope- and reaction-wise contribution to the keff 8 C/E difference between ENDF-7.1 and JENDL-4.0 => The replacement reactivity from U-238 blanket to SS reflector seems better evaluated by JENDL-4.0 than by ENDF-7.1 by 300pcm. This difference is caused by the negative reactivity from of Cr-52 and Na, and of Fe-57, Ni-60, Al. 8
9 ENDF/B-7.1 vs. JENDL-4.0:Structure material Na-23 Na-23 Cr-52 Fe-57 9
10 Reflector Effect : (Dep.UO 2 blanket -> SS reflector) JOYO Small core, Pu+Enriched. Uranium JOYO Mk-I: Pu=17wt% U235=23wt%, Nat. U blanket JOYO Mk-II: Pu=28wt% U235=12wt%, SS reflector 10
11 nu C/E Value Reflector Effect : (Dep.UO 2 blanket -> SS reflector) JOYO Mk-I, II J40 MVP E70 MVP E71 MVP JOYO Mk-1 JOYO Mk JOYO Mk-1 JOYO Mk keff C/Es of JOYO Mk-I and Mk-II O-16 Na-23 Cr-52 Fe-56 Fe-57 Ni-58 Ni-60 U-235 U-238 Pu-239 Pu-240 Others Total Isotope- and reaction-wise contribution to the keff C/E difference between ENDF-7.1 and JENDL-4.0 => The replacement reactivity from U-238 blanket to SS reflector resulted in the positive change of keff for JENDL-4.0, which is larger than that of ENDF-7.1. This difference is caused by the negative reactivity from of Cr-52 and Na, and of Fe-57, Ni-60, Fe-56. However, we cannot judge which library is favorable, since the fuel compositions of the two cores are quite different, unlike the FCA case. 11
12 Concluding Remarks 1. From Los Alamos data, JENDL-4.0 seems better than ENDF-7.1 about the summation of reflector reactivity effect from in, (+) and muave., (-) of U-235. Note that we cannot find which library is better for individual reaction from this benchmark. 2. From FCA data, the replacement reactivity from U-238 blanket to SS reflector seems better evaluated by JENDL-4.0 than by ENDF-7.1, which is caused by the negative reactivity from of Cr-52 and Na, and of Fe-57, Ni-60, Al. JOYO data shows similar trends for reflector effects, but we cannot guess which library is favorable from JOYO, because of the influence from core fuel compositions. 12
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