Mechanic solicitations induced by neutron and photon interactions have to be featured for components lifespan determination. TechnicAtome is in charge of both the design and building on behalf of CEA of the 100 MW Jules Horowitz Reactor (JHR). This modular Material Testing Reactor is under construction in southern France, with radioisotope production and material testing capabilities. | Reflector features and physics consideration issued from the Jules Horowitz Reactor design analyses EPJ Nuclear Sci. Technol. 4 18 2018 Nuclear Sciences E. Privas and L. Chabert published by EDP Sciences 2018 amp Technologies https epjn 2018040 Available online at https REGULAR ARTICLE Reflector features and physics consideration issued from the Jules Horowitz Reactor design analyses Edwin Privas and Laurent Chabert Safety and Power Plant Process Neutronic Shielding Criticality Department TechnicAtome Aix-en-Provence France Received 16 June 2017 Received in final form 28 November 2017 Accepted 31 May 2018 Abstract. Mechanic solicitations induced by neutron and photon interactions have to be featured for components lifespan determination. TechnicAtome is in charge of both the design and building on behalf of CEA of the 100 MW Jules Horowitz Reactor JHR . This modular Material Testing Reactor is under construction in southern France with radioisotope production and material testing capabilities. Inner core components have been designed based on mechanical and thermohydraulic considerations. Both studies require neutronic physical quantities like the neutron flux and deposited energies. The JHR reflector is outside the primary loop and is composed of beryllium. Gamma shields are partially positioned between the reflector and the core to reduce photon heating on aluminum structures. The design is completed and this paper deals with the neutronic and photonic impacts on the reflector. A Monte Carlo methodology based on the MCNP code was developed to model the reactor and enhance fluxes and energy deposited maps. MCNPs mesh options are used over the detailed geometry model. The convolution with mechanical meshes enables to determine neutronic parameters on local structures material by material. Time required for such modeling is very long if one requires results on every mesh with a maximum uncertainty of 2 1s . To reduce time calculation by a .
