Re-analysis of HCPB/HCLL Blanket Mock-up Experiments Using Recent Nuclear Data Libraries K. Kondo, 1, * U. Fischer, 1 A. Klix, 1 P. Pereslavtsev, 1 A. Serikov, 1 and R. Villari 2 1 Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, 76344, Germany 2 ENEA C.R. Frascati, Via E. Fermi 45, I00044 Frascati, Italy We have re-analysed the two breeding blankets experiments performed previously in the frame of the European fusion program on two mock-ups of the European Helium-Cooled-Lithiium Lead (HCLL) and Helium-Cooled-Pebble-Bed (HCPB) test blanket modules for ITER. The tritium pro- duction rate and the neutron and photon spectra measured in these mock-ups were compared with calculations using FENDL-3 Starter Library, release 4 and state-of-the-art nuclear data evaluations, JEFF-3.1.2, JENDL-4.0 and ENDF/B-VII.0. The tritium production calculated for the HCPB mock-up underestimates the experimental result by about 10%. The result calculated with FENDL- 3/SLIB4 gives slightly smaller tritium production by 2% than the one with FENDL-2.1. The differ- ence attributes to the slight modification of the total and elastic scattering cross section of Be. For the HCLL experiment, all libraries reproduce the experimental results well. FENDL-3/SLIB4 gives better result both for the measured spectra and the tritium production compared to FENDL-2.1. I. INTRODUCTION For fusion reactor development, accurate and reliable nuclear data are indispensable. In a future DEMO facil- ity demonstrating power production by fusion, one of the key issues is the prediction accuracy of tritium produced in breeding blankets to attain tritium self-sufficiency. So far many benchmark experiments have been conducted using DT neutron sources all over the world in order to verify the accuracy of nuclear data. Recently the authors have performed re-analyses of a wide range of fusion rel- evant benchmark experiments conducted previously with 14 MeV neutron generators at Frascati, ENEA (FNG), the Technical University Dresden (TUD) and the Fusion Neutron Source (FNS) of JAEA, Japan [1, 2]. In the present paper our special focus is on two breeding blan- kets experiments, which were performed in the frame of the European fusion program on two mock-ups of the European Helium-Cooled-Lithium Lead (HCLL) [3, 4] and Helium-Cooled-Pebble-Bed (HCPB) [5, 6] test blan- ket modules (TBMs) for ITER. The tritium production rate as well as the neutron and photon spectra measured in these mock-ups are compared with calculations using the state-of-the-art nuclear data libraries JEFF-3.1.2 [7], ENDF/B-VII.0 [8] and JENDL-4.0 [9]. These data li- braries complement the Fusion Evaluated Nuclear Data Library (FENDL) which has been developed under the * Corresponding author: keitaro.kondo@kit.edu auspices of the IAEA/NDS to provide a qualified data library for fusion applications. The version FENDL-2.1 [10], assembled in 2003, currently serves as the reference data library for ITER nuclear design analyses. A ma- jor update of this library has been provided with the FENDL-3 project of the IAEA, resulting in the recent starter library FENDL-3/SLIB, release 4 [11]. The pa- per describes detailed results of the analyses performed on those benchmark experiments. The comparison in- cludes results obtained previously with the FENDL-2.1 data library and the new FENDL-3 compilation. II. OVERVIEW OF THE ANALYZED BENCHMARK EXPERIMENTS A. Helium Cooled Pebble Bed (HCPB) Breeder Blanket Mock-up Experiment The HCPB TBM breeder blanket mock-up used in the benchmark experiment replicates all relevant features of a breeder unit of the European HCPB-TBM. The front box of the mock-up has the external dimension of 31.0 cm × 30.9 cm and 29.0 cm thickness and was filled with metallic beryllium and contained two layers of 1.2 cm thickness made of Li 2 CO 3 powder (with the natural 6 Li abundance of 7.5%) simulating breeder materials. The rear box with 14.8 cm thickness was filled with Li 2 CO 3 powder to simulate the rear breeder part of the original breeder unit. The mock-up was irradiated at FNG and the tritium production rates in the upper/lower breeder cassettes were measured using Li 2 CO 3 pellet detectors Available online at www.sciencedirect.com Nuclear Data Sheets 120 (2014) 235–238 0090-3752/© 2014 Elsevier Inc. All rights reserved. www.elsevier.com/locate/nds http://dx.doi.org/10.1016/j.nds.2014.07.055