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Evaluation of High Temperature Gas Cooled Reactor Fuel Particle Coating Failure Models and Data

Evaluation of High Temperature Gas Cooled Reactor Fuel Particle Coating Failure Models and Data PDF Author: Michael Tokar
Publisher:
ISBN:
Category : Gas cooled reactors
Languages : en
Pages : 136

Book Description


Evaluation of High Temperature Gas Cooled Reactor Fuel Particle Coating Failure Models and Data

Evaluation of High Temperature Gas Cooled Reactor Fuel Particle Coating Failure Models and Data PDF Author: Michael Tokar
Publisher:
ISBN:
Category : Gas cooled reactors
Languages : en
Pages : 136

Book Description


An Evaluation of the Applicability of Existing Data to the Analytical Description of a Nuclear-reactor Accident

An Evaluation of the Applicability of Existing Data to the Analytical Description of a Nuclear-reactor Accident PDF Author: Wayne A. Carbiener
Publisher:
ISBN:
Category :
Languages : en
Pages : 38

Book Description


Analysis of Chemical Failure of Coated UO$sub 2$ and Other Oxide Fuels in the High-temperature Gas-cooled Reactor

Analysis of Chemical Failure of Coated UO$sub 2$ and Other Oxide Fuels in the High-temperature Gas-cooled Reactor PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
The thermodynamic data for unirradiated dioxides in the U- ThPu-O system are briefly reviewed. Calculations of oxygen release during fission were made and were found to agree qualitatively with experimental measurements. Theories were developed for prediction of mass transport rates in oxide particles; these included control by either CO-- CO/sub 2/ diffusion, reactions such as disproportionation of carbon monoxide, or solid-state diffusion through the kernel. Methods were devised for the determination of the general type of rate- controlling mechanism from the quantitative analysis of inreactor and out-of- reactor experiments. Application of these methods to an in-pile experiment indicated that CO-- CO/sub 2/ diffusion did not control the rate of UO/sub 2/ or (Th,U)O/sub 2/ migration in BISO particles; instead, control by solid-state diffusion was indicated. (54 references) (auth).

An Assessment of the Methods for Determining Defect Or Failure Fractions in HTGR Coated Particle Fuels and Their Relationship to Particle Microstructure

An Assessment of the Methods for Determining Defect Or Failure Fractions in HTGR Coated Particle Fuels and Their Relationship to Particle Microstructure PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 78

Book Description
The methods for determining the fraction of defective or failed coatings in high-temperature gas-cooled reactor (HTGR) fuel particles, the burn-leach and acid leach methods, are critically analyzed. Evaluation of the method reveals that (1) the efficacy of the methods is limited by access, for leaching and oxidizing fluids, to the interior of defective or failed coatings; (2) the coating defects can be characterized in terms of pores by a distribution of effective pore radii; (3) effective pore radii significantly less than several, hundred nanometers cannot be detected; and (4) pore radii less than the latter limit may contribute significantly to fission product release from the defective or failed particles. The currently used methods are thus inadequate for detecting defective or failed fuel particle coatings. The development of better methods is recommended; the intrusion method, by which a portion of the distribution of effective pore radii was determined in the analysis from limited previous measurements, is suggested as one suitable basis for the development. 32 refs., 10 figs., 11 tabs.

Failure Mechanisms in High Temperature Gas Cooled Reactor Fuel Particles

Failure Mechanisms in High Temperature Gas Cooled Reactor Fuel Particles PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
BISO coated UO2 and ThO2 particles were heated to high temperatures to determine failure mechanisms during hypothetical loss of coolant scenarios. Rapid failure begins when the oxides are reduced to liquid carbides. Several failure mechanisms are applicable, ranging from hole and crack formation in the coatings to catastrophic particle disintegration.

Evaluation of Human Error in High Temperature Gas Cooled Reactor

Evaluation of Human Error in High Temperature Gas Cooled Reactor PDF Author: Waleed Hussain Abul-Faraj
Publisher:
ISBN:
Category :
Languages : en
Pages : 310

Book Description


High Temperature Gas Cooled Reactor Fuel Failure in the Absence of Core Cooling

High Temperature Gas Cooled Reactor Fuel Failure in the Absence of Core Cooling PDF Author: Farzad Rahnema
Publisher:
ISBN:
Category : Gas cooled reactors
Languages : en
Pages : 166

Book Description
Abstract.

Accident Delineation and Evaluation of the High-temperature Gas-cooled Reactor System Concepts

Accident Delineation and Evaluation of the High-temperature Gas-cooled Reactor System Concepts PDF Author: Beverly W. Washburn
Publisher:
ISBN:
Category : Gas cooled reactors
Languages : en
Pages : 255

Book Description


Advances in High Temperature Gas Cooled Reactor Fuel Technology

Advances in High Temperature Gas Cooled Reactor Fuel Technology PDF Author: International Atomic Energy Agency
Publisher:
ISBN: 9789201253101
Category : Business & Economics
Languages : en
Pages : 639

Book Description
This publication reports on the results of a coordinated research project on advances in high temperature gas cooled reactor (HTGR) fuel technology and describes the findings of research activities on coated particle developments. These comprise two specific benchmark exercises with the application of HTGR fuel performance and fission product release codes, which helped compare the quality and validity of the computer models against experimental data. The project participants also examined techniques for fuel characterization and advanced quality assessment/quality control. The key exercise included a round-robin experimental study on the measurements of fuel kernel and particle coating properties of recent Korean, South African and US coated particle productions applying the respective qualification measures of each participating Member State. The summary report documents the results and conclusions achieved by the project and underlines the added value to contemporary knowledge on HTGR fuel.

Experimental and Statistical Investigation of Thermally Induced Failure in Reactor Fuel Particles

Experimental and Statistical Investigation of Thermally Induced Failure in Reactor Fuel Particles PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
An incomplete experimental study into the failure statistics of fuel particle for the high-temperature gas-cooled reactor (HTGR) is described. Fuel particles failure was induced by thermal ramping from room temperature to temperatures in the vicinity of 2273°K to 2773°K in 2 to 30 h and detected by the appearance of 85Kr in the helium carrier gas used to sweep the furnace. The concentration of krypton, a beta emitter, was detected by measuring the current that resulted when the helium sweep gas was passed through an ionization chamber. TRISO fuel particles gave a krypton concentration profile as a function of time that built up in several minutes and decayed in a fraction of an hour. This profile, which was temperature independent, was similar to the impulse response of the ionization chamber, suggesting that the TRISO particles failed instantaneously and completely. BISO fuel particles gave a krypton concentration profile as a function of time that built up in a fraction of an hour and decayed in a fraction of a day. This profile was strongly temperature dependent, suggesting that krypton release was diffusion controlled, i.e., that the krypton was diffusing through a sound coat, or that the BISO coating failed but that the krypton was unable to escape the kernel without diffusion, or that a combination of pre- and postfailure diffusion accompanied partial or complete failure.