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Showing 1 to 20 of 36 for “"pebble-bed"”.
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MCNP4B modeling of pebble-bed reactors
… Carlo code MCNP4B to the neutronic modeling of pebblebed reactors was investigated. A modeling methodology was developed based on an analysis of critical experiments carried out at the HTR-PROTIEUS and ASTRA facilities, and the critical loading of the HTR-10 reactor. A body-centred cubic lattice …
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Modularity in design of the MIT Pebble Bed Reactor
The future of new nuclear power plant construction will depend in large part on the ability of designers to reduce capital, operations, and maintenance costs. One of the methods proposed, is to enhance the modularity of the designs in which the basic plant is broken down into modules, each of which …
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Feasibility of breed/burn fuel cycles in pebble bed HTGR reactors.
Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
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Monte Carlo study of pebble bed reactor fuel reactivity and isotopics
… used in a future verification of the VSOP code. Pebble bed critical experiments carried out on the Swiss PROTEUS facility were chosen as a starting point for a pebble bed benchmark using the Monteburns code. Monteburns, a linking code that uses the ORIGEN2 code to burn MCNP inputs, was used to …
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Waste characteristics of spent nuclear fuel from a pebble bed reactor
… a high-temperature, gas cooled, reactor with a pebble bed core (PBR) and a pressurized water reactor (PWR). There are three significant differences which impact the disposal characteristics of PBR spent pebble fuel from PWR spent fuel assemblies. Pebble bed fuel has bum-up as high as 100,000 …
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Isotopic and reactor physics characterization of a gas-cooled, pebble-bed microreactor
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Multiple-Input Single-Output system identification techniques using the pebble bed modular reactor data
… to obtain a (MISO) mathematical model for the Pebble Bed Modular Reactor (PBMR). MISO system identification techniques are used in this project to study the effect that the inputs have on each other. This information helps in the understanding of processes within the system. The reason for …
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Analysis of the proliferation resistance of the modular pebble bed high temperature gas reactor
The Modular Pebble Bed High Temperature Gas Reactor (MPBR) being designed by the Massachusetts Institute of Technology and the Idaho National Engineering and Environmental Laboratory operates with an online refueling system. This leads to an increased risk of proliferation because the fuel pebbles …
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Effect of helium injection on diffusion dominated air ingress accidents in pebble bed reactors
… To validate SCAD a small scale simulated Pebble Bed Reactor (PBR) was constructed and a series of air ingress experiments with and without helium injection were conducted. In addition, Computational Fluid Dynamic (CFD) simulations were performed using FLUENT @ to model the experiment and …
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Modularity of the MIT Pebble Bed Reactor for use by the commercial power industry
The Modular Pebble Bed Reactor is a small high temperature helium cooled reactor that is being considered for both electric power and hydrogen production. Pebble bed reactors are being developed in South Africa, China and the US. To make smaller 120 Mwe reactors economically competitive with larger …
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Probabilistic accident analysis of the Pebble Bed modular Reactor for use with risk informed regulation
… the pre- application review of the gas-cooled Pebble Bed Modular Reactor (PBMR) has shown that efforts are being made to provide additional "risk-informed" improvements to the licensing process. The work presented herein was completed as part of the DOE Nuclear Energy Research Initiative …
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Characterisation of the effective thermal conductivity in the near wall region of a packed pebble bed
… of the overall heat transfer in a packed bed of spheres. An accurate prediction of the effective thermal conductivity is necessary for the design and analysis of packed pebble bed gas-cooled reactors, especially when considering the safety case. The wall effect present in the near-wall …
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Design, analysis and optimization of the power conversion system for the Modular Pebble Bed Reactor System
The Modular Pebble Bed Reactor system (MPBR) requires a gas turbine cycle (Brayton cycle) as the power conversion system for it to achieve economic competitiveness as a GenIV nuclear system. The availability of controllable helium turbomachinery and compact heat exchangers are thus the critical …
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Deterministic casualty analysis of the Pebble Bed Modular Reactor for use with risk-based safety regulation
… a new reactor concept. A reactor similar to the Pebble Bed Modular Reactor (PBMR) is the design chosen for the analyses. The designers of the PBMR assert that the reactor's inherently safe design justifies the use of a non-standard containment system. This assertion can be treated as a design …
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The design of a reduced diameter Pebble Bed Modular Reactor for reactor pressure vessel transport by railcar
Many desirable locations for Pebble Bed Modular Reactors are currently out of consideration as construction sites for current designs due to limitations on the mode of transportation for large RPVs. In particular, the PBMR-400 design developed by PBMR Pty of South Africa uses an RPV with an outer …
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Fluoride-salt-cooled high-temperature test reactor thermal-hydraulic licensing and uncertainty propagation analysis
… currently considered, the Chinese TMSR-SF1 pebble bed design and MIT's Transportable FHR prismatic core design; two candidate coolants, flibe (LiF-BeF2) and nafzirf (NaF-ZrF4); and forced flow and natural circulation conditions to compare operating regions and LSSS power (maximum power not …
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Levelized Cost of Fuel (LCOF) studies for microreactors using TRISO fuel in hydride and beryllium-based composite moderators in open and closed fuel cycles
… (HTGRs) with TRISO fuel in prismatic- and pebble-bed cores—using four composite moderator concepts (MgO–Be, MgO–BeO, MgO–YH, MgO–ZrH). These options are compared against a prismatic graphite benchmark, under both once-through and continuous-recycle fuel cycles. In once-through prismatic …
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Nuclear reaction analysis cross-sections measurements for Boron and Carbon.
… the raw material used for the operation of the Pebble Bed Modular Reactor 2. The isotopic composition of boron carbide, which is used as a neutron shielding at the SAFARI-1 research reactor.
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Tritium transport, corrosion, and Fuel performance modeling in the Fluoride Salt-Cooled High-Temperature Reactor (FHR)
… Salt-Cooled High-Temperature Reactor (FHR) is a pebble bed nuclear reactor concept fueled by tristructural isotropic (TRISO) fuel particles embedded in graphite spheres and cooled by a liquid fluoride salt known as "flibe" (7LiF-BeF2). A system of models was developed which enabled analyses of …
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Design optimization and analysis of coated particle fuel using advanced fuel performance modeling techniques
… to optimize coated particle fuel used in pebble bed reactors. In this study, the MIT fuel performance model (TIMCOAT) was applied after benchmarking against the experiment results. The optimization study focuses on the fracture toughness of silicon carbide and Bacon anisotropy factor (BAF) …
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