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Title: A qualitative analysis of the neutron population in fresh and spent fuel assemblies during simulated interrogation using the differential die-away technique

In this study, Monte Carlo simulations were performed for the differential die-away (DDA) technique to analyse the time-dependent behaviour of the neutron population in fresh and spent nuclear fuel assemblies as part of the Next Generation Safeguards Initiative Spent Fuel (NGSI-SF) Project. Simulations were performed to investigate both a possibly portable as well as a permanent DDA instrument. Taking advantage of a custom made modification to the MCNPX code, the variation in the neutron population, simultaneously in time and space, was examined. The motivation for this research was to improve the design of the DDA instrument, as it is be ing considered for possible deployment at the Central Storage of Spent Nuclear Fuel and Encapsulation Plant in Sweden (Clab), as well as to assist in the interpretation of the both simulated and measured signals.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [3] ;  [3]
  1. Uppsala Univ., Uppsala (Sweden); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Swedish Nuclear Fuel and Waste Management Company (SKB), Blekholmstorget (Stockholm)
  2. Uppsala Univ., Uppsala (Sweden); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Uppsala Univ., Uppsala (Sweden)
Publication Date:
OSTI Identifier:
1255832
Report Number(s):
LA-UR--15-23441
Journal ID: ISSN 0392-3029
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
ESARDA Bulletin
Additional Journal Information:
Journal Issue: 53; Journal ID: ISSN 0392-3029
Publisher:
European Safeguards Research & Development Association
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION nonproliferation; nondestructive assay; spent fuel; differential die-away; used fuel; active neutron interrogation