Accession Number : ADA213528


Title :   Thermal Hydraulic Analysis of a Packed Bed Reactor Fuel Element


Descriptive Note : Master's thesis


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF NUCLEAR ENGINEERING


Personal Author(s) : Tuddenham, Read S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a213528.pdf


Report Date : 25 May 1989


Pagination or Media Count : 206


Abstract : A model of the behavior of a packed bed nuclear reactor fuel element is developed. It is capable of predicting the temperature, pressure and velocity fields as a function of position throughout the fuel element in both transient and steady state conditions. It is the starting point for the design of a real time analysis module for a reactor power controller. The fuel element consists of a packed bed of fuel particles between two concentrically mounted retention elements. It is cooled by hydrogen flowing radically inward through the bed. The model is based on the fundamental principles of mass, momentum and energy conservation. The balances are applied to a two dimensional array of control volumes, using the lumped parameter approach, to generate sets of simultaneous linear semi-implicit finite difference equations. The Pressure Implicit with Splitting of Operators (PISO) algorithm is then used to advance the model variables in time. An energy balance derived from a single node model of a fuel particle is performed on the solid phase. The model code is applied to a series of steady state and transient problems, varying the peak power density from 0 to 2.1 GW/Cu M. The model also predicts significant effects from conduction and radiation in the solid phase. Keywords: Thesis.


Descriptors :   *GAS COOLED REACTORS , *REACTOR FUEL ELEMENTS , *THERMAL ANALYSIS , *MATHEMATICAL MODELS , TRANSIENTS , DENSITY , VOLUME , REAL TIME , PARAMETERS , TWO DIMENSIONAL , MASS , ENERGY , ARRAYS , THESES , MODULAR CONSTRUCTION , COOLING , HYDROGEN , NODES , VARIABLES , PEAK POWER , PARTICLES , MATHEMATICAL PREDICTION , RETENTION(GENERAL) , BALANCE , MOUNTS , REACTOR FUELS , ENERGY CONSERVATION , BEDS(PROCESS ENGINEERING) , MOMENTUM , HYDRAULIC POWER , SOLID PHASES , STEADY STATE , CONTROL , ALGORITHMS , VELOCITY , COMPUTER PROGRAMS


Subject Categories : Fission Reactor Materials


Distribution Statement : APPROVED FOR PUBLIC RELEASE