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View article: Design and Construction of a 75 Watt Electrically Heated BiTe Thermoelectric Generator for Demonstration and Model Validation
Design and Construction of a 75 Watt Electrically Heated BiTe Thermoelectric Generator for Demonstration and Model Validation Open
Radioisotope thermoelectric generators (RTGs) serve a crucial role providing thermal and electrical energy for long-duration missions often in extreme environments such as the arctic, marine, and outer space biomes. Many current designs st…
View article: Transient Optimization of the Cryogenic Moderator System Controller at the Spallation Neutron Source for Improved Performance
Transient Optimization of the Cryogenic Moderator System Controller at the Spallation Neutron Source for Improved Performance Open
The high-energy neutron beam generated at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is moderated to use cold (slow) neutrons for scientific discoveries. The Cryogenic Moderator System (CMS) removes heat from the …
View article: Investigation of Point-Contact Strategies for CFD Simulations of Pebble-Bed Reactor Cores
Investigation of Point-Contact Strategies for CFD Simulations of Pebble-Bed Reactor Cores Open
This study numerically investigated the effects of various contact strategies on the thermal hydraulic behavior within a structured bed of 100 explicitly modeled pebbles. Four contact strategies and two thermal hydraulic conditions were co…
View article: Spallation Neutron Source Hydrogen Relief Analysis for the Cryogenic Moderator System
Spallation Neutron Source Hydrogen Relief Analysis for the Cryogenic Moderator System Open
The Spallation Neutron Source at Oak Ridge National Laboratory operates the Cryogenic Moderator System (CMS) which provides hydrogen cooling at 20K to three neutron moderators. Each hydrogen loop is protected by multiple burst discs and re…
View article: Dynamic systems modeling of the spallation neutron source cryogenic moderator system to optimize transient control and prepare for power upgrades
Dynamic systems modeling of the spallation neutron source cryogenic moderator system to optimize transient control and prepare for power upgrades Open
Through support of the US Department of Energy’s Office of Basic Energy Sciences, Oak Ridge National Laboratory has begun applying machine learning methods to improve accelerator and target performance of the Spallation Neutron Source (SNS…
View article: Optimal Chloride Salt Mixture for a Fusion Blanket
Optimal Chloride Salt Mixture for a Fusion Blanket Open
Deuterium-tritium fusion reactors cannot operate for a significant period without a closed tritium fuel cycle, according to a recent National Academies of Sciences (NAS) report on bringing fusion reactors to the US electrical grid. This fa…
View article: Design and Testing of the Vortex Ring Facility
Design and Testing of the Vortex Ring Facility Open
This document summarizes the efforts of building an experimental test facility to study the evolution of the cloud following a nuclear detonation above ground level and support the development of numerical models to describe it. The experi…
View article: Preliminary Thermal-Hydraulic Analysis of the UTA–2 Subcritical Linear Accelerator–Driven System
Preliminary Thermal-Hydraulic Analysis of the UTA–2 Subcritical Linear Accelerator–Driven System Open
The National Nuclear Security Administration’s mission includes establishing a reliable supply of 99Mo without highly enriched uranium. Oak Ridge National Laboratory (ORNL) supports this objective through collaborative research and develop…
View article: Pressure Measurements in a Wire-Wrapped 61-Pin Hexagonal Fuel Bundle
Pressure Measurements in a Wire-Wrapped 61-Pin Hexagonal Fuel Bundle Open
To achieve longer-life liquid-metal fast reactor cores, designers are considering to increase the wall gap of the wire-wrapped hexagonal fuel bundles to account for volumetric void swelling and radiation creep. A new wire-wrapped hexagonal…