Volume 3, Issue 2

Original research papers

Radiation Physics


Matteo Ferrari et al.

Pages: 98-105

DOI: 10.21175/RadJ.2018.02.016

Received: 15 JUN 2018, Received revised: 4 NOV 2018, Accepted: 5 NOV 2018, Published online: 27 DEC 2018

SPES is a new generation ISOL facility for the production of intense Radioactive Ion Beams by fission reactions at high rate. Two main topics related to the management of SPES as an intense neutron source are here discussed: the radiation resistance of polymeric components used for its construction and the residual activation of the system after machine shutdown. Radiation effects on elastomeric O-rings and lubricating grease are experimentally investigated to assure reliable operation of the facility and safe post-operation management. Experimental protocols have been developed to irradiate samples in a neutron and gamma facility of a TRIGA Mark II nuclear research reactor. Based on the results of post-irradiation mechanical tests, the most radiation-resistant products are selected. A case study is dedicated to the life prediction of the O-ring of a SPES gate valve. Moreover, extensive Monte Carlo calculations are performed to evaluate the residual radioactivity of the facility after operation. The outcomes represent useful inputs to plan inspection and maintenance during the facility shutdown.
  1. G. Prete et al., “The SPES project at the INFN-Laboratori nazionali di Legnaro,” EPJ Web Conf.,vol. 66, 11030, Mar. 2014.
    DOI: 10.1051/epjconf/20146611030
  2. A. Andrighetto et al., “Multifoil UCx target for the SPES project – An update,” Eur. Phys. J. A,vol. 30, no. 3, pp. 591 – 601, Dec. 2006.
    DOI: 10.1140/epja/i2006-10144-3
  3. A. Monetti et al., “The RIB production target for the SPES project,” Eur. Phys. J. A,vol. 51, 128, Oct. 2015.
    DOI: 10.1140/epja/i2015-15128-6
  4. R. O. Bolt, J. G. Carrol, Radiation Effects on Organic Materials, New York (NY), USA: Academic Press, 1963.
  5. A. Zenoni et al., “Radiation resistance of elastomeric O-rings in mixed neutron and gamma fields: Testing methodology and experimental results,” Rev. Sci. Instrum.,vol. 88, no. 11, 113304, Nov. 2017.
    DOI: 10.1063/1.5011035
  6. A. Andrighetto et al., “SPES: An intense source of Neutron-Rich Radioactive Beams at Legnaro,” IOP Conf. Series: J. Phys. Conf. Ser., vol. 966, 012028, 2018.
    DOI: 10.1088/1742-6596/966/1/012028
  7. M. Ferrari et al., “An Irradiation Campaign of Lubricants at TRIGA Mark II Nuclear Reactor for the European Spallation Source (ESS) and the Selective Production of Exotic Species (SPES) facilities,” in Proc. 26th Int. Conf. Nuclear Energy for New Europe (NENE 2017), Bled, Slovenia, 2017, pp. 301.1 – 301.8.
    Retrieved from: https://www.djs.si/proc/nene2017/html/pdf/NENE2017_all.pdf;
    Retrieved on: Jun. 13, 2018
  8. D. Battini et al., “Experimental testing and numerical simulations for life prediction of gate valve O-rings exposed to mixed neutron and gamma fields,” unpublished.
  9. R. M. Mortier, M. F. Fox, S. T. Orszulik, “Lubricating grease,” in Chemistry and Technology of lubricants, 3rd ed., Springer, 2010, ch. 14, pp. 411 – 432.
    DOI: 10.1007/978-1-4020-8662-5
  10. MCNPXTM version 2.7.0, Radiation Safety Information Computational Center, Oak Ridge (TN), USA, 2011.
    Retrieved from: https://rsicc.ornl.gov/;
    Retrieved on: Jun. 14, 2018
  11. M. Ferrari et al., A residual activation study on the SPES Front-End: Dosimetry and Radiation Protection Calculations, SPES-Note-WPB06_04_0004, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Italy, 2017.
  12. A. Ferrari, P. R. Sala, A. Fasso, J. Ranft, FLUKA: A Multi-Particle Transport Code,” SLAC-R-773, CERN, Switzerland, 2005.
    Retrieved from: https://www.fluka.org/fluka.php?id=secured_intro;
    Retrieved on: Jun. 14, 2018
  13. F. X. Gallmeier et al., “The CINDER’90 transmutation code package for use in accelerator applications in combination with MCNPX,” in 19th Meeting on Collaboration of Advanced Neutron Sources (ICANS XIX), Grindelwald, Switzerland, 2010.
    Retrieved from http://www.oecd-nea.org/tools/abstract/detail/CCC-0755/
    Retrieved on: Jun. 14, 2018
  14. D. Chiesa, “Development and Experimental Validation of a Monte Carlo Simulation Model for the TRIGA Mark II Reactor,” Ph.D. dissertation, Università degli Studi di Milano Bicocca, Milan, Italy, 2013.
  15. S. Pandini et al., “Effect of combined gamma and neutron irradiation on EPDM and FPM elastomers” in AIP Conference Proceedings, 1981, 020052 (2018)
    DOI: 10.1063/1.5045914