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Title: Demonstration of Emitted-Neutron Computed Tomography to Count Fuel Pins

Abstract

In this paper, we report demonstration of emitted-neutron computed tomography using fast fission neutrons to infer the geometry of sources of special nuclear material (SNM) such as fuel pins. In a proof-of-concept measurement at the Idaho National Laboratory s (INL s) Zero Power Physics Reactor (ZPPR) facility, an array of unirradiated Pu MOX fuel rodlets in a soup can were imaged, and a bias defect consisting of a single rodlet containing Pu replaced by one containing depleted uranium (DU) was detected. The imaging system employed in the demonstration is based on a newly constructed array of pixelated neutron detectors that are suitable for arrangement in a close-packed imaging array and whose active volume consists of liquid scintillator EJ-309 which allows neutron-gamma discrimination via pulse shape to enable pure fast-neutron imaging. The imaging array was used along with a radial collimator aperture in order to perform high quality fast-neutron imaging where tomographic reconstruction of slices through an object resolve neutron sources similar in dimension to a fuel pellet, or about 1 cm. Measurements were performed at Oak Ridge National Laboratory (ORNL) with neutron sources in addition to those performed at the INL s ZPPR facility with Pu MOX fuel rodlets. Anmore » analogous capability to detect single-pin defects in spent fuel assemblies would be desirable, such as for safeguards verification measurements of spent fuel assemblies just prior to transferring them from the spent fuel cooling pool to long term dry cask storage. This paper describes the design and construction of the present imager, characterization measurements with neutron sources at ORNL, measurements with SNM at INL s ZPPR facility, and feasibility of building an analogous imager for spent fuel measurements.« less

Authors:
 [1];  [1];  [2];  [3];  [2];  [1]
  1. ORNL
  2. Sandia National Laboratories (SNL)
  3. Idaho National Laboratory (INL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1079266
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: Fifty-third Annual Meeting of the INMM, Orlando, FL, USA, 20120715, 20120719
Country of Publication:
United States
Language:
English

Citation Formats

Hausladen, Paul, Blackston, Matthew A, Brubaker, E., Chichester, David, Marleau, P., and Newby, Robert Jason. Demonstration of Emitted-Neutron Computed Tomography to Count Fuel Pins. United States: N. p., 2012. Web.
Hausladen, Paul, Blackston, Matthew A, Brubaker, E., Chichester, David, Marleau, P., & Newby, Robert Jason. Demonstration of Emitted-Neutron Computed Tomography to Count Fuel Pins. United States.
Hausladen, Paul, Blackston, Matthew A, Brubaker, E., Chichester, David, Marleau, P., and Newby, Robert Jason. 2012. "Demonstration of Emitted-Neutron Computed Tomography to Count Fuel Pins". United States.
@article{osti_1079266,
title = {Demonstration of Emitted-Neutron Computed Tomography to Count Fuel Pins},
author = {Hausladen, Paul and Blackston, Matthew A and Brubaker, E. and Chichester, David and Marleau, P. and Newby, Robert Jason},
abstractNote = {In this paper, we report demonstration of emitted-neutron computed tomography using fast fission neutrons to infer the geometry of sources of special nuclear material (SNM) such as fuel pins. In a proof-of-concept measurement at the Idaho National Laboratory s (INL s) Zero Power Physics Reactor (ZPPR) facility, an array of unirradiated Pu MOX fuel rodlets in a soup can were imaged, and a bias defect consisting of a single rodlet containing Pu replaced by one containing depleted uranium (DU) was detected. The imaging system employed in the demonstration is based on a newly constructed array of pixelated neutron detectors that are suitable for arrangement in a close-packed imaging array and whose active volume consists of liquid scintillator EJ-309 which allows neutron-gamma discrimination via pulse shape to enable pure fast-neutron imaging. The imaging array was used along with a radial collimator aperture in order to perform high quality fast-neutron imaging where tomographic reconstruction of slices through an object resolve neutron sources similar in dimension to a fuel pellet, or about 1 cm. Measurements were performed at Oak Ridge National Laboratory (ORNL) with neutron sources in addition to those performed at the INL s ZPPR facility with Pu MOX fuel rodlets. An analogous capability to detect single-pin defects in spent fuel assemblies would be desirable, such as for safeguards verification measurements of spent fuel assemblies just prior to transferring them from the spent fuel cooling pool to long term dry cask storage. This paper describes the design and construction of the present imager, characterization measurements with neutron sources at ORNL, measurements with SNM at INL s ZPPR facility, and feasibility of building an analogous imager for spent fuel measurements.},
doi = {},
url = {https://www.osti.gov/biblio/1079266}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2012},
month = {Sun Jan 01 00:00:00 EST 2012}
}

Conference:
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