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Title: Cleaning Cesium Radionuclides from BN-350 Primary Sodium

Abstract

This paper reports the successful design and operation of a system to remove highly radioactive cesium from the sodium coolant of the BN-350 reactor in Aktau, Kazakhstan. As an international effort between the United States and the Republic of Kazakhstan, a cesium-trapping system was jointly designed, fabricated, installed, and successfully operated. The results are significant for a number of reasons, including (a) a significant reduction of radioactivity levels of the BN-350 coolant and reactor surfaces, thereby reducing exposure to workers during shutdown operations; (b) demonstration of scientific ideas; and (c) the engineering application of effective cesium trap deployment for commercial-sized liquid-metal reactors. About 255 300 GBq (6900 Ci) of cesium was trapped, and the {sup 137}Cs specific activity in BN-350 primary sodium was decreased from 296 MBq/kg (8000 {mu}Ci/kg) to 0.37 MBq/kg (10 {mu}Ci/kg) by using seven cesium traps containing reticulated vitreous carbon (RVC) as the cesium adsorbent. Cesium trapping was accomplished by pumping sodium from the primary circuit, passing it through a block of RVC within each trap, and returning the cleaned sodium to the primary circuit. Both to predict and to analyze the behavior of the cesium traps in the BN-350 reactor primary circuit, a model was developedmore » that satisfactorily describes the observed results of the cesium trapping. By using this model, thermodynamic parameters, such as the heat of adsorption of cesium atoms on RVC and on internal piping surfaces of the BN-350 reactor primary circuit, -22.7 and -5.0 kJ/mole, respectively, were extracted from the experimental data.« less

Authors:
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Publication Date:
OSTI Identifier:
20840258
Resource Type:
Journal Article
Journal Name:
Nuclear Technology
Additional Journal Information:
Journal Volume: 150; Journal Issue: 1; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0029-5450
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; ADSORBENTS; ADSORPTION HEAT; BN-350 REACTOR; BORON NITRIDES; CARBON; CESIUM; CESIUM 137; CLEANING; COOLANTS; DESIGN; KAZAKHSTAN; PERSONNEL; RADIOACTIVITY; REACTOR OPERATION; SHUTDOWN; SODIUM; SURFACES; USA

Citation Formats

Romanenko, O G, Allen, K J, Wachs, D M, Planchon, H P, Wells, P B, Michelbacher, J A, Nazarenko, P, Dumchev, I, Maev, V, Zemtzev, B, Tikhomirov, L, Yakovlev, V, and Synkov, A. Cleaning Cesium Radionuclides from BN-350 Primary Sodium. United States: N. p., 2005. Web.
Romanenko, O G, Allen, K J, Wachs, D M, Planchon, H P, Wells, P B, Michelbacher, J A, Nazarenko, P, Dumchev, I, Maev, V, Zemtzev, B, Tikhomirov, L, Yakovlev, V, & Synkov, A. Cleaning Cesium Radionuclides from BN-350 Primary Sodium. United States.
Romanenko, O G, Allen, K J, Wachs, D M, Planchon, H P, Wells, P B, Michelbacher, J A, Nazarenko, P, Dumchev, I, Maev, V, Zemtzev, B, Tikhomirov, L, Yakovlev, V, and Synkov, A. 2005. "Cleaning Cesium Radionuclides from BN-350 Primary Sodium". United States.
@article{osti_20840258,
title = {Cleaning Cesium Radionuclides from BN-350 Primary Sodium},
author = {Romanenko, O G and Allen, K J and Wachs, D M and Planchon, H P and Wells, P B and Michelbacher, J A and Nazarenko, P and Dumchev, I and Maev, V and Zemtzev, B and Tikhomirov, L and Yakovlev, V and Synkov, A},
abstractNote = {This paper reports the successful design and operation of a system to remove highly radioactive cesium from the sodium coolant of the BN-350 reactor in Aktau, Kazakhstan. As an international effort between the United States and the Republic of Kazakhstan, a cesium-trapping system was jointly designed, fabricated, installed, and successfully operated. The results are significant for a number of reasons, including (a) a significant reduction of radioactivity levels of the BN-350 coolant and reactor surfaces, thereby reducing exposure to workers during shutdown operations; (b) demonstration of scientific ideas; and (c) the engineering application of effective cesium trap deployment for commercial-sized liquid-metal reactors. About 255 300 GBq (6900 Ci) of cesium was trapped, and the {sup 137}Cs specific activity in BN-350 primary sodium was decreased from 296 MBq/kg (8000 {mu}Ci/kg) to 0.37 MBq/kg (10 {mu}Ci/kg) by using seven cesium traps containing reticulated vitreous carbon (RVC) as the cesium adsorbent. Cesium trapping was accomplished by pumping sodium from the primary circuit, passing it through a block of RVC within each trap, and returning the cleaned sodium to the primary circuit. Both to predict and to analyze the behavior of the cesium traps in the BN-350 reactor primary circuit, a model was developed that satisfactorily describes the observed results of the cesium trapping. By using this model, thermodynamic parameters, such as the heat of adsorption of cesium atoms on RVC and on internal piping surfaces of the BN-350 reactor primary circuit, -22.7 and -5.0 kJ/mole, respectively, were extracted from the experimental data.},
doi = {},
url = {https://www.osti.gov/biblio/20840258}, journal = {Nuclear Technology},
issn = {0029-5450},
number = 1,
volume = 150,
place = {United States},
year = {Fri Apr 15 00:00:00 EDT 2005},
month = {Fri Apr 15 00:00:00 EDT 2005}
}