Community Research and Development Information Service - CORDIS

Abstract

Neutron fluxes inside the concrete shielding of accelerators activate in depth concrete and structural metals. The problem was studied at the VUB cyclotron in order to prepare decommissioning plans. (60)Co and (152)Eu in particular, create a medium tern (50y) dismantling and nuclear waste problem. A short term radiation protection problem (5y) exists due to copper activation products, especially (65)Zn. As low as reasonably achievable (ALARA)-based dose management is illustrated during concrete bore sampling in decommissioning analysis. The development and implementation of clearance levels in future will determine the economic extent of the problem. Optimization techniques could be used to comply with future authorization criteria. They allow for a comparison of different, immediate or deferred dismantling scenarios, taking into account waste volumes, costs, doses, detection levels and clearance impacts. A cooling time to clearance level is presented as a useful indicator for scenario selection. Prevention opportunities are suggested.

Additional information

Authors: EGGERMONT G, University of Brussels, Radiation Protection Office and Cyclotron Department (BE);BULS N, University of Brussels, Radiation Protection Office and Cyclotron Department (BE);HERMANNE A, University of Brussels, Radiation Protection Office and Cyclotron Department (BE);VAN SUETENDAEL W, JRC Geel (BE);VERMEERSCH F, SCK/CEN, Mol (BE)
Bibliographic Reference: Paper presented: 1st European ALARA Network Workshop on ALARA and Decommissioning, Saclay (FR), 1-3 December 1997
Availability: Available from (1) as Paper EN 41111 ORA
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top