Reproduction of shielding concrete activation measurements by simulations

Author:

Hajdú Dávid12,Klausz Milán13,Zagyvai Péter1

Affiliation:

1. Environmental Physics Laboratory, Centre for Energy Research , Budapest 1121, Hungary

2. University of Pannonia Institute of Radiochemistry and Radioecology, , Veszprém 8200, Hungary

3. European Spallation Source ESS ERIC , Lund 22484, Sweden

Abstract

Abstract With the increasing number of decommissioning projects, radioactive waste estimation of biological shielding concretes is becoming more and more important. Simulation tools supporting this activity, like MCNP and Cinder are already available; however, publicly available neutron spectra in shielding concretes are limited. The aim of the study was to present and evaluate possible model arrangements for accurate neutron transport to deeper points of shielding concretes from the reactor pressure vessel. Representation of reality, neutron behavior and activity generation of seven long-lived radioisotopes (54Mn, 60Co, 65Zn, 133Ba, 134Cs, 152Eu and 154Eu) were assessed in each arrangement. After evaluating several model geometries, a conical shape neutron reflecting surface was shown to be the most suitable one to reproduce neutron fields in deeper layers of shielding concretes from a monodirectional initial neutron source.

Funder

National Research, Development and Innovation Fund

Publisher

Oxford University Press (OUP)

Subject

Public Health, Environmental and Occupational Health,Radiology, Nuclear Medicine and imaging,General Medicine,Radiation,Radiological and Ultrasound Technology

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