Monte Carlo shielding evaluation of a CSNS Multi-Physics instrument

Tairan Liang; Fei Shen; Wen Yin; Juping Xu; Quanzhi Yu; Tianjiao Liang

Nuclear Engineering and Technology (Dec 2019)

Monte Carlo shielding evaluation of a CSNS Multi-Physics instrument

Tairan Liang,
Fei Shen,
Wen Yin,
Juping Xu,
Quanzhi Yu,
Tianjiao Liang

Affiliations

Tairan Liang: School of Physics and Electronic Information, Inner Mongolia University for the Nationalities, Tongliao 028043, China
Fei Shen: Dongguan Branch, Institute of High Energy Physics, CAS, Beijing, 100049, China
Wen Yin: Dongguan Branch, Institute of High Energy Physics, CAS, Beijing, 100049, China; Corresponding author. Dongguan Branch, The Institute of High Energy Physics, Chinese Academy of Sciences, Dongguan, China.
Juping Xu: Dongguan Branch, Institute of High Energy Physics, CAS, Beijing, 100049, China
Quanzhi Yu: Dongguan Branch, Institute of High Energy Physics, CAS, Beijing, 100049, China; Institute of Physics, CAS, Beijing, 100190, China
Tianjiao Liang: Dongguan Branch, Institute of High Energy Physics, CAS, Beijing, 100049, China

Journal volume & issue: Vol. 51, no. 8
pp. 1998 – 2004

Abstract

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The Multi-Physics (MP) instrument is one of 20 neutron spectrometers planned in the China Spallation Neutron Source (CSNS). This paper presents a shielding calculation for the MP instrument using Monte Carlo codes MCNPX and FLUKA. First, the neutrons that escape from the CSNS decoupled water moderator and are delivered to the beam line of the MP instrument are calculated to use as the source term of the shielding calculation. Then, to validate the calculation method based on multiple variance reduction techniques, a cross check between MCNPX and FLUKA codes is performed by comparing the calculation results of the dose rate distribution on a simplified beam line model. Finally, a complete geometry model of the MP instrument is set up, and the primary parameters for the shielding design are obtained according to the calculated dose rate map considering different worst-case scenarios. Keywords: Neutron beam line, Monte Carlo method, Shielding calculation

Published in Nuclear Engineering and Technology

ISSN: 1738-5733 (Print)
Publisher: Elsevier
Country of publisher: Korea, Republic of
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Nuclear engineering. Atomic power
Website: http://www.journals.elsevier.com/nuclear-engineering-and-technology

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