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Title: Assessment of Activation on Level L3 of the Tokamak Building due to the ITER Tokamak Cooling Water System

Abstract

The ITER fusion reactor is being built to demonstrate the feasibility of fusion power and will be the largest tokamak in the world. The tokamak cooling water system (TCWS) will extract the heat generated during operations and includes large amounts of piping and equipment such as pumps and heat exchangers (HXs) that are located in a large shielded region on level L3 of the tokamak building. During operation, water in the TCWS will be activated by plasma neutrons and then flow into this shielded region. The activated coolant will in turn activate the steel in the TCWS during operation and result in an activation gamma source and radiation responses that must be assessed to inform equipment selection and maintenance schedules.The activation of materials in the shielded region of level L3 was assessed at several decay times and for different equipment options using the Oak Ridge National Laboratory (ORNL) shutdown dose rate (SDDR) code suite. The ORNL SDDR code suite implements the rigorous two-step method using the Multi-Step Consistent Adjoint-Driven Importance Sampling (MS-CADIS) method to create effective neutron variance reduction parameters for the photon response of interest. In conclusion, two different HX designs, shell and tube and shell and plate, weremore » considered, as well as the impact of cobalt impurities in steel equipment.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1545225
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 75; Journal Issue: 6; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ITER; shutdown dose rate; MS-CADIS

Citation Formats

Royston, Katherine, Radulescu, Georgeta, Van Hove, Walter A., Wilson, Stephen C., and Kim, Seokho H. Assessment of Activation on Level L3 of the Tokamak Building due to the ITER Tokamak Cooling Water System. United States: N. p., 2019. Web. doi:10.1080/15361055.2019.1606519.
Royston, Katherine, Radulescu, Georgeta, Van Hove, Walter A., Wilson, Stephen C., & Kim, Seokho H. Assessment of Activation on Level L3 of the Tokamak Building due to the ITER Tokamak Cooling Water System. United States. doi:10.1080/15361055.2019.1606519.
Royston, Katherine, Radulescu, Georgeta, Van Hove, Walter A., Wilson, Stephen C., and Kim, Seokho H. Thu . "Assessment of Activation on Level L3 of the Tokamak Building due to the ITER Tokamak Cooling Water System". United States. doi:10.1080/15361055.2019.1606519.
@article{osti_1545225,
title = {Assessment of Activation on Level L3 of the Tokamak Building due to the ITER Tokamak Cooling Water System},
author = {Royston, Katherine and Radulescu, Georgeta and Van Hove, Walter A. and Wilson, Stephen C. and Kim, Seokho H.},
abstractNote = {The ITER fusion reactor is being built to demonstrate the feasibility of fusion power and will be the largest tokamak in the world. The tokamak cooling water system (TCWS) will extract the heat generated during operations and includes large amounts of piping and equipment such as pumps and heat exchangers (HXs) that are located in a large shielded region on level L3 of the tokamak building. During operation, water in the TCWS will be activated by plasma neutrons and then flow into this shielded region. The activated coolant will in turn activate the steel in the TCWS during operation and result in an activation gamma source and radiation responses that must be assessed to inform equipment selection and maintenance schedules.The activation of materials in the shielded region of level L3 was assessed at several decay times and for different equipment options using the Oak Ridge National Laboratory (ORNL) shutdown dose rate (SDDR) code suite. The ORNL SDDR code suite implements the rigorous two-step method using the Multi-Step Consistent Adjoint-Driven Importance Sampling (MS-CADIS) method to create effective neutron variance reduction parameters for the photon response of interest. In conclusion, two different HX designs, shell and tube and shell and plate, were considered, as well as the impact of cobalt impurities in steel equipment.},
doi = {10.1080/15361055.2019.1606519},
journal = {Fusion Science and Technology},
number = 6,
volume = 75,
place = {United States},
year = {2019},
month = {5}
}

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Works referenced in this record:

The Multi-Step CADIS Method for Shutdown Dose Rate Calculations and Uncertainty Propagation
journal, December 2015

  • Ibrahim, Ahmad M.; Peplow, Douglas E.; Grove, Robert E.
  • Nuclear Technology, Vol. 192, Issue 3
  • DOI: 10.13182/NT15-1

Algorithmic Improvements to MCNP5 for High-Resolution Fusion Neutronics Analyses
journal, August 2018