Application of ADVANTG variance reduction parameters with MCNP6 at ESS

Issue title: ICANS-XXIII, hosted by the Oak Ridge National Laboratory Neutron Sciences Directorate

Guest editors: Kenneth W. Herwig and Erik B. Iverson

Article type: Research Article

Authors: Miller, Thomas M.^{; *} | DiJulio, Douglas D. | Santoro, Valentina

Affiliations: European Spallation Source ERIC, P.O. Box 176, SE-221 00 Lund, Sweden. E-mails: thomas.miller@ess.eu, douglas.dijulio@ess.eu, valentina.santoro@ess.eu

Correspondence: [*] Corresponding author. E-mail: thomas.miller@ess.eu.

Abstract: Monte Carlo radiation transport codes have become the primary tool for shielding and activation analysis at high-powered spallation neutron sources. However, use of these codes to model facilities that have large amounts of shielding requires the use of variance reduction methods. This paper presents examples that apply ADVANTG generated variance reduction parameters to analyses performed at ESS using MCNP6. This requires some limitations in ADVANTG to be overcome and little-known features to be used. The focus of this paper is to describe how these limitations were overcome so other analyst at spallation sources can benefit from these methods as well.

Keywords: Variance reduction, ADVANTG, CADIS, FW-CADIS, spallation

DOI: 10.3233/JNR-200158

Journal: Journal of Neutron Research, vol. 22, no. 2-3, pp. 199-208, 2020