Subcritical Multiplication with a Fixed Source
Conference
·
· Transactions of the American Nuclear Society
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of New Mexico, Albuquerque, NM (United States)
In a subcritical, multiplying medium, the system multiplication describes the expected total number of neutrons created by a single source neutron. Subcriticality plays a large role in criticality safety and thus it is vital for the subcritical multiplication factor be accurate, especially as a system approaches criticality. This work examines the accuracy of calculating the system multiplication using the MCNP6.2® k-eigenvalue power iteration (KCODE) method when a fixed-point source is present in a multiplying medium, for near critical systems. This work compares the standard approach for calculating system multiplication, using the fixed-source calculational approach, to a new, single k-eigenvalue power iteration approach that incorporates a fixed-source component and a fission-source component into a single calculation. For the remainder of this paper, some theoretical background and numerical results for an approximate k eigenvalue approach, an accurate fixed-source approach and a new and more accurate k-eigenvalue approach to computing system multiplication are provided.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
- DOE Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1908160
- Report Number(s):
- LA-UR-20-25248
- Conference Information:
- Journal Name: Transactions of the American Nuclear Society Journal Issue: 1 Journal Volume: 123
- Country of Publication:
- United States
- Language:
- English
Similar Records
Limits on Subcritical Reactivity Determination using Rossi-α and Related Methods
Neutron Number Probability Distributions in a Subcritical System Using the Forward Master Equation
Definition of Subcriticality Using the Importance Function for the Production of Fission Neutrons
Thesis/Dissertation
·
Mon Apr 30 00:00:00 EDT 2018
·
OSTI ID:1435542
Neutron Number Probability Distributions in a Subcritical System Using the Forward Master Equation
Journal Article
·
Wed Jun 15 00:00:00 EDT 2016
· Transactions of the American Nuclear Society
·
OSTI ID:22991994
Definition of Subcriticality Using the Importance Function for the Production of Fission Neutrons
Journal Article
·
Sun Oct 15 00:00:00 EDT 2000
· Nuclear Science and Engineering
·
OSTI ID:20804669