Comparison of neutron lifetimes as predicted by MCNP and DANTSYS

Conference · Wed Jan 22 04:00:00 EST 1997

OSTI ID:471376

Hendricks, J S; Parsons, D K; Spriggs, G D ^[1]

---

1. and others

The prompt removal lifetime algorithm used in the latest version of MCNP was modified to conform with the neutron-balance definitions described by Spriggs et al. In accordance with the neutron-balance theory, the non-adjoint-weighted removal lifetime is given by where {Phi} is the angular neutron flux, v is the neutron velocity, {Sigma}{sub a} is the macroscopic absorption cross section, E is neutron energy, {Omega} is angle, and r is a spatial vector. The numerator in this expression represents the total neutron population in the system, N, and the denominator represents the total loss rate due to leakage and absorption.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 471376
• Report Number(s): LA-UR--97-285; CONF-970607--16; ON: DE97004783
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
66 PHYSICS
COMPUTERIZED SIMULATION
LIFETIME
MONTE CARLO METHOD
NEUTRON TRANSPORT
PROMPT NEUTRONS