A new research program on accidents in spent fuel pools: the DENOPI project

In the framework of the post-Fukushima actions, an experimental project named DENOPI has been launched by Institut de Radioprotection et de Surete Nucleaire in collaboration with research laboratories with the aim to study the behavior of spent fuel pools under loss of cooling and loss of coolant conditions. This paper describes the objectives and the strategy of this program which includes experiments at different scales and simulations based on CFD and system codes. Some results obtained on fuel cladding degradation due to oxidation under air/steam mixtures are also reported in the last section.

[1]  Christian Duriez,et al.  Influence of a pre-oxide layer on oxygen diffusion and on post- quench mechanical properties of Zircaloy-4 after steam oxidation at 900°C , 2010 .

[2]  Christian Duriez,et al.  Effect of Pre-Oxide on Zircaloy-4 High-Temperature Steam Oxidation and Post-Quench Mechanical Properties , 2015 .

[3]  Chin-Hsiang Cheng,et al.  Buoyancy-assisted flow reversal and convective heat transfer in entrance region of a vertical rectangular duct , 2000 .

[4]  Tzu-Chen Hung,et al.  The development of a three-dimensional transient CFD model for predicting cooling ability of spent fuel pools , 2013 .

[5]  Christian Duriez,et al.  Potentialities of Raman Imaging for the Analysis of Oxide Scales Formed on Zircaloy-4 and M5® in Air at High Temperature , 2013, Oxidation of Metals.

[6]  E. T. Hayes,et al.  Some Effects of Heating Zirconium in Air, Oxygen, and Nitrogen , 1949 .

[7]  Martin Steinbrück,et al.  Prototypical experiments relating to air oxidation of Zircaloy-4 at high temperatures , 2009 .

[8]  Olivia Coindreau,et al.  STUDY OF ZIRCALOY-4 CLADDING AIR DEGRADATION AT HIGH TEMPERATURE , 2013 .

[9]  M. Vilasi,et al.  Effects of water vapour on the oxidation of a nickel-base 625 alloy between 900 and 1,100 °C , 2011 .

[10]  Frank-Peter Weiss,et al.  Evolution of the structure of a gas–liquid two-phase flow in a large vertical pipe , 2007 .

[11]  H. B. Probst,et al.  Critical role of nitrogen during high temperature scaling of zirconium , 1973 .

[12]  R Spatz,et al.  The influence of walls and upper tie plate slots on the flooding mechanism in fuel elements with and without heat transfer between steam and water , 1989 .

[13]  F. Jacq,et al.  ASTEC V2 severe accident integral code main features, current V2.0 modelling status, perspectives , 2014 .

[14]  C. Duriez,et al.  Zircaloy-4 and M5 ® high temperature oxidation and nitriding in air , 2008 .

[15]  W. W. Smeltzer,et al.  THE OXIDATION OF ZIRCONIUM IN OXYGEN-NITROGEN ATMOSPHERES , 1980 .

[16]  Michel Soustelle,et al.  Experimental tests to validate the rate-limiting step assumption used in the kinetic analysis of solid-state reactions , 2008 .

[17]  Christian Duriez,et al.  Reaction in air and in nitrogen of pre-oxidised Zircaloy-4 and M5™ claddings ☆ , 2013 .