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Title: Fast-neutron measurements and calculations for the LiD fusion plate developed at TAMU

Abstract

To characterize the high energy neutron production from an LiD plate to be installed on the TAMU-reactor, measurements and calculations were performed. Two types of measurements were used to substantiate the high energy neutron flux. One used an NE-213 detector system to measure the high energy neutron production from the LiD plate and the other employed foil activation to measure the neutron flux entering the irradiation cell. To validate the experimental measurements, the MORSE program was used (1) to predict the conversion efficiency of the LiD plate by computing the expected response for the NE-213 detector system, (2) to compute the high energy neutron flux in the irradiation cell if the LiD plate were to be installed, and (3) to compare calculated fluxes with the experimental results from foil activation measurements in the irradiation cell. The LiD plate was designed and constructed by considering (1) neutron production due to {sup 6}Li(n,{alpha}){sup 3}T reactions and subsequent T-D or T-Li fusion as the tritons slow down and (2) the escape probability of tritons from the LiD material. This allowed the needed {sup 6}Li enrichment and thickness of the plate to be selected. The number of high energy neutrons produced per thermal neutronmore » incident upon the LiD plate was measured as 1.03 {times} 10{sup {minus}4} {plus minus} 8.5% n/n{sub th}. Based on this conversion efficiency, subsequent MORSE calculations showed that the high-energy neutrons produced from the reactor core as a result of fission would predominate in the irradiation cell if the fusion plate were to be installed on the inside of the window; therefore, the usability of the LiD plate as a 14-MeV-booster in the irradiation cell at NSC is questionable in this configuration.« less

Authors:
Publication Date:
Research Org.:
Texas A and M Univ., College Station, TX (USA)
OSTI Identifier:
6157535
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; EXPERIMENTAL CHANNELS; NEUTRON FLUX; LITHIUM DEUTERIDES; NEUTRON TRANSPORT; NSCR REACTOR; COMPARATIVE EVALUATIONS; DESIGN; FAST NEUTRONS; M CODES; NEUTRON REACTIONS; THERMAL NEUTRONS; VALIDATION; ALKALI METAL COMPOUNDS; BARYON REACTIONS; BARYONS; COMPUTER CODES; DEUTERIDES; DEUTERIUM COMPOUNDS; ELEMENTARY PARTICLES; ENRICHED URANIUM REACTORS; FERMIONS; HADRON REACTIONS; HADRONS; HOMOGENEOUS REACTORS; HYDRIDE MODERATED REACTORS; HYDRIDES; HYDROGEN COMPOUNDS; LITHIUM COMPOUNDS; LITHIUM HYDRIDES; NEUTRAL-PARTICLE TRANSPORT; NEUTRONS; NUCLEAR REACTIONS; NUCLEON REACTIONS; NUCLEONS; POOL TYPE REACTORS; RADIATION FLUX; RADIATION TRANSPORT; REACTOR CHANNELS; REACTOR COMPONENTS; REACTOR EXPERIMENTAL FACILITIES; REACTORS; RESEARCH AND TEST REACTORS; SOLID HOMOGENEOUS REACTORS; TESTING; TRAINING REACTORS; TRIGA TYPE REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS; 220600* - Nuclear Reactor Technology- Research, Test & Experimental Reactors

Citation Formats

Na, Seongho. Fast-neutron measurements and calculations for the LiD fusion plate developed at TAMU. United States: N. p., 1989. Web.
Na, Seongho. Fast-neutron measurements and calculations for the LiD fusion plate developed at TAMU. United States.
Na, Seongho. Sun . "Fast-neutron measurements and calculations for the LiD fusion plate developed at TAMU". United States.
@article{osti_6157535,
title = {Fast-neutron measurements and calculations for the LiD fusion plate developed at TAMU},
author = {Na, Seongho},
abstractNote = {To characterize the high energy neutron production from an LiD plate to be installed on the TAMU-reactor, measurements and calculations were performed. Two types of measurements were used to substantiate the high energy neutron flux. One used an NE-213 detector system to measure the high energy neutron production from the LiD plate and the other employed foil activation to measure the neutron flux entering the irradiation cell. To validate the experimental measurements, the MORSE program was used (1) to predict the conversion efficiency of the LiD plate by computing the expected response for the NE-213 detector system, (2) to compute the high energy neutron flux in the irradiation cell if the LiD plate were to be installed, and (3) to compare calculated fluxes with the experimental results from foil activation measurements in the irradiation cell. The LiD plate was designed and constructed by considering (1) neutron production due to {sup 6}Li(n,{alpha}){sup 3}T reactions and subsequent T-D or T-Li fusion as the tritons slow down and (2) the escape probability of tritons from the LiD material. This allowed the needed {sup 6}Li enrichment and thickness of the plate to be selected. The number of high energy neutrons produced per thermal neutron incident upon the LiD plate was measured as 1.03 {times} 10{sup {minus}4} {plus minus} 8.5% n/n{sub th}. Based on this conversion efficiency, subsequent MORSE calculations showed that the high-energy neutrons produced from the reactor core as a result of fission would predominate in the irradiation cell if the fusion plate were to be installed on the inside of the window; therefore, the usability of the LiD plate as a 14-MeV-booster in the irradiation cell at NSC is questionable in this configuration.},
doi = {},
url = {https://www.osti.gov/biblio/6157535}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

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