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Title: Nuclear Data Measurements with the Oak Ridge Electron Linear Accelerator (ORELA) for Supporting Nuclear Fuel Cycle Applications

Abstract

For more than 30 years, the Oak Ridge National Laboratory (ORNL) has performed research and development to provide accurate nuclear cross-section data in the resonance region. Overall, the Nuclear Data (ND) Program is tightly coupled with nuclear fuel cycle analyses and radiation transport methods development efforts at ORNL. As a result, resonance region measurements and evaluations are performed in concert with nuclear science and technology needs and requirements. At the heart of the ND program is the Oak Ridge Electron Linear Accelerator (ORELA) that is used to perform high-resolution neutron cross-section measurements in the resonance region. Recently, an accelerator refurbishment effort has been initiated at ORELA to improve operation reliability. As a result, new cross-section measurements have been performed at ORELA, and ORELA is readily available to address current and future nuclear data needs in the resonance region.

Authors:
 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Oak Ridge Electron Linear Accelerator
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
978766
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: The Eighth International Topical Meeting on Nuclear Applications and Utilization of Accelerators, Pocatello, ID, USA, 20070730, 20070802
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; ACCELERATORS; ELECTRONS; LINEAR ACCELERATORS; NEUTRONS; NUCLEAR FUELS; ORNL; RADIATION TRANSPORT; RELIABILITY; RESONANCE; ORELA

Citation Formats

Dunn, Michael E, and Guber, Klaus H. Nuclear Data Measurements with the Oak Ridge Electron Linear Accelerator (ORELA) for Supporting Nuclear Fuel Cycle Applications. United States: N. p., 2007. Web.
Dunn, Michael E, & Guber, Klaus H. Nuclear Data Measurements with the Oak Ridge Electron Linear Accelerator (ORELA) for Supporting Nuclear Fuel Cycle Applications. United States.
Dunn, Michael E, and Guber, Klaus H. Mon . "Nuclear Data Measurements with the Oak Ridge Electron Linear Accelerator (ORELA) for Supporting Nuclear Fuel Cycle Applications". United States. doi:.
@article{osti_978766,
title = {Nuclear Data Measurements with the Oak Ridge Electron Linear Accelerator (ORELA) for Supporting Nuclear Fuel Cycle Applications},
author = {Dunn, Michael E and Guber, Klaus H},
abstractNote = {For more than 30 years, the Oak Ridge National Laboratory (ORNL) has performed research and development to provide accurate nuclear cross-section data in the resonance region. Overall, the Nuclear Data (ND) Program is tightly coupled with nuclear fuel cycle analyses and radiation transport methods development efforts at ORNL. As a result, resonance region measurements and evaluations are performed in concert with nuclear science and technology needs and requirements. At the heart of the ND program is the Oak Ridge Electron Linear Accelerator (ORELA) that is used to perform high-resolution neutron cross-section measurements in the resonance region. Recently, an accelerator refurbishment effort has been initiated at ORELA to improve operation reliability. As a result, new cross-section measurements have been performed at ORELA, and ORELA is readily available to address current and future nuclear data needs in the resonance region.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • The time dependent spectrum of neutrons in the water-moderated Oak Ridge Electron Linear Accelerator (ORELA) target has been calculated using a modified version of the MORSE multi-group Monte Carlo code with an analytic hydrogen scattering model. Distributions of effective neutron distance traversed in the target are estimated with a time and energy dependent algorithm from the leakage normal to the target face. These data are used in the resonance shaped analyses of time-of-flight cross section measurements to account for the experimental resolution function. The 20 MeV--10 eV energy range is adequately represented in the MORSE code by the 174 groupmore » VITAMIN-E cross section library with a P{sub 5} expansion. An approximate representation of the ORELA positron source facility, recently installed near the target, has been included in the calculations to determine any perturbations the positron source might create in the computed neutron distributions from the target. A series of coupled Monte Carlo calculations was performed from the target to the positron source and back to the target using a next-event estimation surface source for each step. The principal effect of the positron source was found to be an increase in the distance for the lower energy neutron spectra, producing no real change in the distributions where the ORELA source is utilized for experiments. Different configurations for the target were investigated in order to simulate the placement of a shadow bar in the neutron beam. These beam configurations included neutrons escaping from : (1) the central tantalum plates only, (2) the entire target with the tantalum plates blocked out, and (3) only a small area from the water. Comparisons of the current data with previous calculations having a less detailed model of the tantalum plates have been satisfactory. 10 refs.« less
  • ORELA is an intense, pulsed neutron source located in the Engineering Physics and Mathematics Division of Oak Ridge National Laboratory. In operation since 1969, it has primarily been used to provide nuclear data for applied and basic research problems. Results have been documented in over 500 publications. In this paper the author looks at the properties of this facility which make it possible to determine the isotopic content (as well as amounts) of an unknown material, and thus make it of interest to ANDA and material certification studies.
  • The 40-meter capture system of R.L. Macklin at ORELA has been used to measure capture cross sections for over eighty isotopes between A = 75 and 161, the primary mass region of interest for fission products. This review outlines the primary features of the capture system, lists the isotopes measured and their references, and describes recent changes incorporated in the capture system.
  • The 40-meter capture system of R.L. Macklin at ORELA has been used to measure capture cross sections for over eighty isotopes between A = 75 and 161, the primary mass region of interest for fission products. This review outlines the primary features of the capture system, lists the isotopes measured and their references, and describes recent changes incorporated in the capture system.
  • A new multiparameter data acquisition system has been developed and fabricated at the Oak Ridge Electron Linear Accelerator (ORELA) which utilizes an IBM PS/2 Model 80 personal computer and data handler with a 2048 word buffer. The acquisition system can simultaneously acquire data from one, two, or three digitizers, multiplex up to four detectors, read and control up to 16 scalers, and output 32 DC logic signals which can be used to control external instrumentation. Software has been developed for the OS/2 operating system, supporting multiparameter data storage for up to three million channels with the capability of collecting datamore » in a background mode, to make the computer available for other tasks while collecting data. The system also supports multiparameter biasing and can collect, crunch, and store data at rates as high as 30,000 events per second.« less