ANS 2018 Winter Meeting

Orlando, FL • November 11-15, 2018

Session Title: “ANS-8 Standards Forum”
Session Type: Discussion
Session Organizer: Doug Bowen (ORNL)
Summary: Subcommittee ANS-8, Operations with Fissile Material Outside Reactors, meets to discuss various technical and administrative aspects of the approximately 20 national consensus standards under its purview. In addition to status and progress updates by representatives of individual working groups, formal presentations on the technical bases of numerical values such as subcritical limits and experiences with applications of particular standards are solicited. Agenda topics such as new and expanded standards are also encouraged.

Session Title: “Recent Nuclear Criticality Safety Program Technical Accomplishments”
Session Type: Contributed Papers
Session Organizer: Lori Scott (SAIC)
Summary: The Nuclear Criticality Safety Program (NCSP) has been doing interesting technical work supporting the DOE criticality safety enterprise, as well as benefiting the nuclear community as a whole. There are few opportunities to learn about these efforts since they cannot all be presented at an ANS meeting. However, an NCSP Technical Seminar was held. The goal of this seminar was to have each NCSP Task Manager present their technical results from FY 2018. Specifically, the presentations provided a summary of: the work that was done; why the work was done; and who benefited from the work or could potentially benefit across the DOE as well as the nuclear complex. This led to an opportunity for the NCSP to showcase outstanding NCSP technical accomplishments and as a result, the best technical results that will have the most benefit to the nuclear community as a whole have been compiled and those presenters will provide these technical results at the 2018 ANS Winter Meeting.

Session Title: “Criticality Safety Officers Programs”
Session Type: Panel
Session Organizer: Chris Haught (CNS)
Summary: This session addresses programs for implementation and maintenance of Nuclear Criticaity Safety (NCS) controls, including the use of Criticality Safety Officer (CSO) staff positions. Responsibility for nuclear criticality safety ultimately lies with the personnel that conduct fissile material activities. A healthy NCS program include integration of multiple organizations to assure a clear understanding of the process evaluation and proper implementation of NCS controls. ANSI/ANS-8.19 outlines criteria for implementation and maintenance of NCS controls. Some sites use formal CSO programs within the operating organization with a primary staff duty of implementing NCS requirements and resolving NCS compliance issues. Other sites have assigned implementation responsibilities as collateral duties. This session is to share information from several sites on their programs for implementation and maintenance of NCS controls.

Session Title: “ENDF/B-VIII.0: Evaluation and Validation”
Session Type: Panel
Session Organizer: Michael Zerkle (NNL)
Session Co-sponsors: RPD
Summary: With the planned release of ENDF/B-VIII.0, this session will provide a panel discussing new nuclear data evaluations included in ENDF/B-VIII.0 and the work completed to date on validation of the next major release of the US national nuclear data library. Emphasis will be on fast and resonance evaluation, covariance data, thermal scattering law evaluations, and validation.

Session Title: “New Code Developments for Nuclear Criticality Safety Applications”
Session Type: Contributed Papers
Session Organizer: Luiz Leal (IRSN), Vladimir Sobes (ORNL)
Session Co-sponsors: MCD, RPD
Summary: The purpose of this session is to address new developments in computational methodologies in support of nuclear criticality safety calculations. For the past several decades, there have been software advances to solve problems in connection with criticality safety. The new improvements leverage computer resources not available in the past. Nuclear data evaluations tools, Monte Carlo and deterministic neutron transport codes have achieved a high degree of maturity allowing for better interpretation of the benchmark results and systematic propagation of nuclear data uncertainty. This session will highlight how the code developments impact and improve nuclear criticality safety calculations.

Session Title: “Critical and Subcritical Experiments”
Session Type: Contributed Papers
Session Organizer: Jesson Hutchinson (LANL)
Session Co-sponsors: NNPD, YMG
Summary: Critical and subcritical experiments are performed every year to support a variety of national security missions, including nuclear nonproliferation, counter-proliferation, criticality safety research and development, nuclear emergency response, and a variety of hands-on training. Papers on critical and subcritical experiments (design, measurement, analysis, methods) will showcase current work in this area.

Session Title: “Data, Analysis and Operations in Nuclear Criticality Safety”
Session Type: Contributed Papers
Session Organizer: Theresa Cutler (LANL)
Confirmation Number: Summary: The purpose of this session is to provide a forum for timely presentation of general issues in the area of nuclear criticality safety that are not covered in other special session topics.

Session Title: “Hand Calculation Methodology and Use”
Session Type: Panel
Session Organizer: Jerry Hicks (NNSA, retd), James Bunsen (LANL)
Session Co-sponsors: YMG
Summary:  A workshop on hand calculations for those interested in criticality safety will be given at the ANS 2018 Winter Meeting in conclusion to the Nuclear Criticality Safety Division’s annual Membership Challenge. Solutions to the challenge and suggested methods on best completing the challenge will be discussed. Hand calculations have been used in the criticality safety profession for years to analyze processes with fissionable material to ensure subcriticality. There are multiple methods of hand calculations to use and two main categories dependent upon the situation: single unit methods and array methods. Single unit methods include diffusion theory, core density conversions, and buckling. The primary array methods used are surface density, density analog, limiting surface density and solid angle method.