Please grant 150K core-hours for Q4 for this project. Thanks, Shashi ________________________________ From: allocations-admins <[email protected]> on behalf of [email protected] <[email protected]> Sent: Tuesday, June 27, 2017 4:47 PM To: [email protected] Subject: [allocations-admins] [LCRC Accounts] Project Request: ibr2 Hello, A new project on the LCRC cluster has been requested. Please forward the information on to the LCRC Allocation sub-committee. Applicant's name: alberto talamo Applicant's institution: ANL Applicant's division: NE Project Name: ibr2 Project title: IBR-2M Transient Associated funding: NNSA M3 Other Systems: eddy cluster of NE Science: The transient of the IBR-2M research reactor of Russia will be simulated using the Serpent and OpenFOAM software and the simulations results will be compared with the experimental data. At present, no neutronics software can model the IBR-2M transient because the reactor is moderated by two reflectors rotating, in opposite directions, very rapidly and this invalidates the point kinetics equations that are inside the computer programs used in nuclear engineering. The precursor-based delayed neutron emission model, unique of the Serpent software, does not rely on the point kinetics equations and can successfully model the IBR-2M transient. Serpent is developed at VTT Technical Research Center of Finland. During the transient, the reactor changes from subcritical to supercritical and delivers a peak power of 1,850 MW. Serpent simulations will model the rotation of the two movable reflectors and the thermal feedback from the power excursion of the IBR-2M reactor will be modeled using the OpenFOAM CFD software developed at Argonne National Laboratory. The IBR-2M reactor uses high enriched plutonium fuel, has a fast neutron spectrum, and is cooled by sodium. Argonne National Laboratory has an outstanding record in the design and modeling of sodium cooled nuclear reactors. Project description: The IBR-2M research reactor is located in Dubna (Russia) and has been in operation since the end of 2011. The facility mainly consists of a sodium-cooled pulsed nuclear reactor loading high-enriched plutonium fuel. Two reflectors, that rotate in opposite directions generate, for about 200 ms, a neutron pulse and change the reactor configuration from deep subcritical to supercritical. Supercriticality is reached when both nickel reflectors are aligned with the fuel zone. The blades of the two rotating reflectors are made of nickel alloy; the main rotating reflector blade has two rounded rectangle holes, whereas the auxiliary rotating reflector blade has just one rounded rectangular hole. The nickel blades are attached to steel blade-holders. In the fuel rods zone, the fuel assembly has hexagonal shape and contains 7 fuel rods and 6 steel displacers. The average thermal power during the pulse repetition period is 2 MWth; the peak thermal power is 1830 MWth. The previous number reduces to 0.16 MWth when the reflectors are not aligned with the fuel. The IBR-2M reactor includes: the core (containing the fuel rods and the fuel assemblies), the vessel, the stationary and rotating reflectors, the control rods in the stationary reflector, the cooling system of the stationary and rotating reflectors, and the shielding. The facility is used for experiments in many branches of physics, including: condensed matter, biology, chemistry, and material science. The IBR-2M reactor has been modeled using the Serpent software (written in C laguage and developed at VTT Finland) at Argonne National Laboratory using stereolithography (STL) geometry with unstructured meshes. In the STL geometry representation, volumes are defined by the union of triangular surfaces (facets). When SERPENT uses the STL geometry, it defines a regular lattice of cells superimposed to the STL geometry and starts a ray-tracing procedure from the triangular surfaces. This ray-tracing procedure defines the volume that a neutron enters after crossing a triangular facet and is referred to as adaptive search mesh. The adaptive search mesh algorithm of SERPENT attaches to each STL facet a list of the intersected regular lattice cells. The latter define a rectangular bounding box containing the minimum and maximum values of the three vertices of the triangular facets. The adaptive search mesh algorithm for the STL geometry has been introduced in the Serpent software to reduce the computing time. The rotating reflector blades move so fast that point kinetics equations fail to accurately model the power transient. The Serpent software does not use point kinetics equations, it relies on the precursor-based delayed neutrons emission model, and can accurately describe the power transient. The objective of this project is modeling the IBR-2M transient by the Serpent software and including the thermal-hydraulic feedback by the OpenFOAM software. The milestones of the project are the following: 1. perform the IBR-2M Serpent simulation of the power transient without any thermahydraulics feedback; 2. achieving a strong scalability for the simulations at point 1; 3. repeating the IBR-2M analyses with the inclusion of the thermalhydraulics feedback from OpenFOAM simulations. The simulation of the IBR-2M research reactor transient will be accomplished by the following team: • Dr. Alberto Talamo (ANL USA) will be responsible for the project coordination, the geometry modeling of the IBR-2M research reactor, and the Serpent simulations. • Dr. Jaakko Leppänen (VTT Finland) is the head of the Serpent development team, he will provide the support to efficiently run the Serpent software program and act as consultant for the Serpent simulations. • Dr. Ville Valtavirta (VTT Finland) has written the moving geometry and thermal feedback subroutines of the Serpent software, he will provide the support to efficiently run the Serpent software program and act as consultant for the Serpent simulations. • Dr. Yousry Gohar (ANL USA) is Argonne National Laboratory fellow, he has more than 40 years experience in nuclear engineering and will act as advisor for accomplishing high fidelity simulations. The only member of the team who will access the Blues cluster is Dr. Alberto Talamo. Industry partnership: Project URL: http://flnph.jinr.ru/en/facilities/ibr-2 IBR-2<http://flnph.jinr.ru/en/facilities/ibr-2> flnph.jinr.ru The IBR-2 reactor hall. Virtual excursion on the complex of spectrometers of the IBR-2 pulsed reactor. The IBR-2 reactor with its unique technical approach produces ... Requested allocation: 980000 Q1: 0 Q2: 0 Q3: 490000 Q4: 490000 Justification: A static simulation (no transient) of the IBR-2M reactor takes 2 days using 32 cores of the eddy cluster of the NE division. Storage requirements: The requester has used undetermined amount hours of their initial startup project. In addition to approving an initial amount, please specify a Category and Subcategory for this project. For a list of the current selection of approved categories, please see: https://wiki.lcrc.anl.gov/wiki/Processes/Categories Once the Allocation committee has approved the project, please go to the Project Management page to create it: https://accounts.lcrc.anl.gov/projects.php Thank You, The LCRC Accounts System