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Title: Status Report on Scoping Reactor Physics and Sensitivity/Uncertainty Analysis of LR-0 Reactor Molten Salt Experiments

Abstract

Experiments are being planned at Research Centre Rež (RC Rež) to use the FLiBe (2 7LiF-BeF 2) salt from the Molten Salt Reactor Experiment (MSRE) to perform reactor physics measurements in the LR-0 low power nuclear reactor. These experiments are intended to inform on neutron spectral effects and nuclear data uncertainties for advanced reactor systems utilizing FLiBe salt in a thermal neutron energy spectrum. Oak Ridge National Laboratory (ORNL) is performing sensitivity/uncertainty (S/U) analysis of these planned experiments as part of the ongoing collaboration between the United States and the Czech Republic on civilian nuclear energy research and development. The objective of these analyses is to produce the sensitivity of neutron multiplication to cross section data on an energy-dependent basis for specific nuclides. This report provides a status update on the S/U analyses of critical experiments at the LR-0 Reactor relevant to fluoride salt-cooled high temperature reactor (FHR) and liquid-fueled molten salt reactor (MSR) concepts. The S/U analyses will be used to inform design of FLiBe-based experiments using the salt from MSRE.

Authors:
 [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Reactor and Nuclear Systems Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Nuclear Reactor Technologies (NE-7). Advanced Reactor Technologies Program
OSTI Identifier:
1328309
Report Number(s):
ORNL/TM-2016/399
RC0424000; NERC037; TRN: US1700302
DOE Contract Number:
AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; FLIBE; THERMAL NEUTRONS; LR-0 REACTOR; MSRE REACTOR; LITHIUM FLUORIDES; BERYLLIUM FLUORIDES; REACTOR PHYSICS; SENSITIVITY ANALYSIS; TEMPERATURE RANGE 0400-1000 K; NEUTRON SPECTRA; CROSS SECTIONS; ENERGY DEPENDENCE; EXPERIMENT DESIGN; MOLTEN SALT FUELED REACTORS; MOLTEN SALT COOLED REACTORS

Citation Formats

Brown, Nicholas R., Mueller, Donald E., Patton, Bruce W., and Powers, Jeffrey J. Status Report on Scoping Reactor Physics and Sensitivity/Uncertainty Analysis of LR-0 Reactor Molten Salt Experiments. United States: N. p., 2016. Web. doi:10.2172/1328309.
Brown, Nicholas R., Mueller, Donald E., Patton, Bruce W., & Powers, Jeffrey J. Status Report on Scoping Reactor Physics and Sensitivity/Uncertainty Analysis of LR-0 Reactor Molten Salt Experiments. United States. doi:10.2172/1328309.
Brown, Nicholas R., Mueller, Donald E., Patton, Bruce W., and Powers, Jeffrey J. 2016. "Status Report on Scoping Reactor Physics and Sensitivity/Uncertainty Analysis of LR-0 Reactor Molten Salt Experiments". United States. doi:10.2172/1328309. https://www.osti.gov/servlets/purl/1328309.
@article{osti_1328309,
title = {Status Report on Scoping Reactor Physics and Sensitivity/Uncertainty Analysis of LR-0 Reactor Molten Salt Experiments},
author = {Brown, Nicholas R. and Mueller, Donald E. and Patton, Bruce W. and Powers, Jeffrey J.},
abstractNote = {Experiments are being planned at Research Centre Rež (RC Rež) to use the FLiBe (2 7LiF-BeF2) salt from the Molten Salt Reactor Experiment (MSRE) to perform reactor physics measurements in the LR-0 low power nuclear reactor. These experiments are intended to inform on neutron spectral effects and nuclear data uncertainties for advanced reactor systems utilizing FLiBe salt in a thermal neutron energy spectrum. Oak Ridge National Laboratory (ORNL) is performing sensitivity/uncertainty (S/U) analysis of these planned experiments as part of the ongoing collaboration between the United States and the Czech Republic on civilian nuclear energy research and development. The objective of these analyses is to produce the sensitivity of neutron multiplication to cross section data on an energy-dependent basis for specific nuclides. This report provides a status update on the S/U analyses of critical experiments at the LR-0 Reactor relevant to fluoride salt-cooled high temperature reactor (FHR) and liquid-fueled molten salt reactor (MSR) concepts. The S/U analyses will be used to inform design of FLiBe-based experiments using the salt from MSRE.},
doi = {10.2172/1328309},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Technical Report:

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  • In September 2016, reactor physics measurements were conducted at Research Centre Rez (RC Rez) using the FLiBe (2 7LiF + BeF 2) salt from the Molten Salt Reactor Experiment (MSRE) in the LR-0 low power nuclear reactor. These experiments were intended to inform on neutron spectral effects and nuclear data uncertainties for advanced reactor systems using FLiBe salt in a thermal neutron energy spectrum. Oak Ridge National Laboratory (ORNL), in collaboration with RC Rez, performed sensitivity/uncertainty (S/U) analyses of these experiments as part of the ongoing collaboration between the United States and the Czech Republic on civilian nuclear energy researchmore » and development. The objectives of these analyses were (1) to identify potential sources of bias in fluoride salt-cooled and salt-fueled reactor simulations resulting from cross section uncertainties, and (2) to produce the sensitivity of neutron multiplication to cross section data on an energy-dependent basis for specific nuclides. This report provides a final report on the S/U analyses of critical experiments at the LR-0 Reactor relevant to fluoride salt-cooled high temperature reactor (FHR) and liquid-fueled molten salt reactor (MSR) concepts. In the future, these S/U analyses could be used to inform the design of additional FLiBe-based experiments using the salt from MSRE. The key finding of this work is that, for both solid and liquid fueled fluoride salt reactors, radiative capture in 7Li is the most significant contributor to potential bias in neutronics calculations within the FLiBe salt.« less
  • The important physics considerations involved in the current TNS tokamak design are divided into four parts: (1) PLASMA DYNAMICS: The minimum ..beta.. required for ignition is shown to be insensitive to the transport scaling used (with ..beta.. approximately 5%). It is also argued that particle diffusion alone may set an upper limit to the ..beta..-value achievable in a tokamak. (2) PLASMA HEATING: The theory of lower hybrid (LH) heating of a tokamak plasma is presented with applications to the current TNS models. (3) PLASMA SHAPING AND MHD: The double layer field shaping coil and the doubly indented ''peanut'' systems aremore » analyzed from the standpoints of stability, control, and external power demands. (4) PLASMA BOUNDARY PHYSICS: The behavior of potential limiter materials under thermonuclear burn conditions is examined. A combination of Be-Ni and carbon are shown to best satisfy current TNS requirements, with carbon serving in the high load regions. The surface physics involved along the first wall is shown to have a strong impact on the efficiency of any vacuum pumping system.« less