Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"Pebble Bed Reactor"”.
-
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 …
-
Monte Carlo study of pebble bed reactor fuel reactivity and isotopics
… licensing of future modular high temperature gas reactor designs. The goal of this thesis was to develop models, techniques, and data to be 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 …
-
Waste characteristics of spent nuclear fuel from a pebble bed reactor
… aspects between 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 …
-
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 …
-
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 …
-
Effective thermal conductivity of binary mixed materials with fissile components - an empirical approach
… effective thermal conductivity for the spherical pebble fuel in a pebble bed reactor. The approach is based on two main concepts: a structural approximation and an empirical formulation. As for the structural approximation, the binary mixed material was assumed to be equivalent to a binary layered …
-
An integrated methodology for quantitative assessment of proliferation resistance of advanced nuclear systems using probabilistic methods
… reflecting an evaluator's beliefs. A modular pebble bed reactor (MPBR) design was chosen as the reference system for demonstration of the methodology. The demonstration study follows the integrated evaluation methodology, and gives a particular assessment of the proliferation resistance …
-
Using the FLUENT computational fluid dynamics code to model the NACOK corrosion test
… the nuclear engineering community. The Modular Pebble Bed Reactor (MPBR) is among the advanced reactor designs proposed for future deployment. As such, it offers an excellent opportunity to illustrate the possible contributions of computational modeling to the reactor design process. Because the …
-
Generation of graphite particles by abrasion and their characterization
… by abrasion that would occur in an operating pebble bed reactor is of interest for reasons of safety, operation, and maintenance. To better understand this abrasion and particle generation, I have completed two independent tests using a custom in-house, designed and built, testing system. One …
-
Option approach to investment in modular nuclear electricity-generating capacity
… and the other is to go with small and modular reactor technology such as the Modular Pebble Bed Reactor (MPBR). This thesis examines the modular technology and its flexibility to add incremental capacity to timely respond to market demand. The decision to invest in a ten-module 1,100MWe MPBR …
-
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 …
-
Air Ingress in HTGRs: the process, effects, and experimental methods relating to its investigation and consequences
Helium-cooled, graphite moderated reactors have been considered for a future fleet of high temperature and high efficiency nuclear power plants. Nuclear-grade graphite is used in these reactors for structural strength, neutron moderation, heat transfer and, within a helium environment, has …
-
The Effect of Coating Parameters On Advanced TRISO Fuels With Zirconium Carbide
… obtainable in the very high temperature reactor (VHTR) design. These problems include but are not limited to over pressurization of the kernel due to fission gas buildup as well as kernel migration, in the presence of a temperature gradient, known as the amoeba effect. To negate these …
-
Effect of helium injection on diffusion dominated air ingress accidents in pebble bed reactors
… rupture of a coaxial pipe. Air enters into the reactor cavity at a rate dictated by diffusion, until the buoyancy force is strong enough to initiate natural convective flow through the reactor. The SCAD method, developed by Yan et al. reduces the buoyancy force in a high temperature gas reactor …