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Title: A Modern Theoretical Approach to the R-matrix and the Coming EDA6 Los Alamos Implementation

Authors:
ORCiD logo [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1367806
Report Number(s):
LA-UR-16-29052
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: R-Matrix Codes for Charged-Particle Reactions in the Resolved Resonance Region 5-7 December 2016 ; 2016-12-05 - 2016-12-07 ; Vienna, Austria
Country of Publication:
United States
Language:
English
Subject:
Atomic and Nuclear Physics

Citation Formats

Paris, Mark W., and Hale, Gerald M. A Modern Theoretical Approach to the R-matrix and the Coming EDA6 Los Alamos Implementation. United States: N. p., 2017. Web.
Paris, Mark W., & Hale, Gerald M. A Modern Theoretical Approach to the R-matrix and the Coming EDA6 Los Alamos Implementation. United States.
Paris, Mark W., and Hale, Gerald M. Tue . "A Modern Theoretical Approach to the R-matrix and the Coming EDA6 Los Alamos Implementation". United States. doi:. https://www.osti.gov/servlets/purl/1367806.
@article{osti_1367806,
title = {A Modern Theoretical Approach to the R-matrix and the Coming EDA6 Los Alamos Implementation},
author = {Paris, Mark W. and Hale, Gerald M.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 27 00:00:00 EDT 2017},
month = {Tue Jun 27 00:00:00 EDT 2017}
}

Conference:
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  • We have been using R-matrix theory many years at Los Alamos to describe reactions in light systems, especially those containing fusion reactions. The theory is ideally suited for describing the resonances that are usually seen in light-element reactions, and at the same time it builds in the correct energy dependence of the transition matrix elements at low energies by making explicit use of the solutions for the external parts of the interaction. Thus, the method gives reliable extrapolations to low energies for both neutron- and charged-particle-induced reactions. We will present here the results of analysis that have been done, ormore » are in progress, for reactions in the four- and five-nucleon systems, containing the fusion reactions of major interest: T(d,n){sup 4}He, {sup 3}He,D(d, p)T, and D(d,n){sup 3}He. These analyses contain all possible types of data that have been measured for the two-body reactions of these systems, a method that we have found crucial for determining their true resonant structures, and for ensuring reliable R-matrix interpolations and extrapolations of even the cross-section data. Integrated cross sections will be presented in the form of astrophysical S-functions, as functions of center-of-mass energy, in order that their low energy behavior might be better displayed. In addition to the R-matrix results, we will also show earlier cross-section parametrizations by Duane and Peres that still are used widely within the function reactor community. Some severe shortcomings of these earlier data sets are revealed by comparison with modern measurements and with the R-matrix calculations. More details about these comparisons and useful representations of the R-matrix cross sections and their associated reactivities (<{sigma}v>) recommended for use in fusion reactor design are given in a paper by Bosch and Hale has been submitted for publication.« less
  • In May 1994, The Defense Nuclear Facility Safety Board (DNFSB) issued recommendation 94-1 to the Secretary of Energy indicating the need for improved remediation efforts within the defense nuclear facilities complex. The primary concern was for the safety of the workers, the public, and the environment as a result of improperly stabilized and packaged fissile materials. The DNFSB recommended that an integrated plan be formulated to convert the identified materials to forms or conditions suitable for safe interim storage. In addition, the DNFSB recommended that plutonium metal and oxides (> 50 weight-percent plutonium) be stabilized and packaged in accordance withmore » the criteria stated in the DOE storage standard (DOE-STD-3013). In response to the recommendations, DOE requested input from all the defense-related sites and as a result, individual Site Integrated Stabilization and Management Plans (SISMP) were established. The following 2 milestones are identified in the Los Alamos SISMP: (1) stabilize high-risk vault items and recover the plutonium as oxide for packaging to meet the long-term storage standard by September 1997; (2) stabilize the remaining residue inventory and recover the plutonium as oxide. Repackage the existing plutonium metal and oxide (> 50% plutonium assay) for long-term storage by May 2002.« less
  • Contractor independent review of contractor prepared safety documents has ceased as a requirement under DOE orders. However, a recent study to determine root causes of the poor quality and extremely long approval times for Los Alamos National Laboratory nuclear safety document has identified such a review as a crucial step in ensuring quality. LANL has teamed with the DOE Field Office to reinstate an independent review process modeled after DOE-STD-1104. A review guide has been prepared predicated on the content of DOE-STD-3009. Discipline has been enforced to ensure that comments reflect important issues and that resolution of the comment ismore » possible. Safety management at both LANL and DOE have embraced this concept. This process has been exercised and has resulted in improvements in safety analysis quality and a degree of uniformity between DOE and LANL reviews.« less
  • Loss of containment of nuclear material stored in containers such as food-pack cans, paint cans, or taped slip lid cans has generated concern about packaging requirements for interim storage of nuclear materials in working facilities such as the plutonium facility at Los Alamos National Laboratory (LANL). The Department of Energy (DOE) issued DOE M 441.1-1, Nuclear Materials Packaging Manual on March 7, 2008 in response to the Defense Nuclear Facilities Safety Board Recommendation 2005-1. The Manual directs DOE facilities to follow detailed packaging requirements to protect workers from exposure to nuclear materials stored outside of approved engineered-contamination barriers. Los Alamosmore » National Laboratory has identified the activities that will be performed to bring LANL into compliance with DOE M 441.1-1. These include design, qualification and procurement of new containers, repackaging based on a risk-ranking methodology, surveillance and maintenance of containers, and database requirements. The primary purpose is to replace the out-dated nuclear material storage containers with more robust containers that meet present day safety and quality standards. The repackaging campaign is supported by an integrated risk reduction methodology to prioritize the limited resources to the highest risk containers. This methodology is systematically revised and updated based on the collection of package integrity data. A set of seven nested packages with built-in filters have been designed. These range in size from 1 qt. to 10 gallon. Progress of the testing to meet Manual requirements will be given. Due to the number of packages at LANL, repackaging to achieve full compliance will take five to seven years.« less