IRSN, Institut de radioprotection et de sûreté nucléaire

Search our site :


Contact us :

En Fr

Enhancing Nuclear Safety



Progress in modeling Silver-Indium-Cadmium control rod degradation and release,

European Review Meeting on Severe Accident Research (ERMSAR 2005), Aix-en-Provence, 14-16 November 2005

B. Maliverney(1), K. Trambauer(2), W. Plumecocq(3), R. Dubourg(3), T. Haste(4).

Document type > *Congrès/colloque

Keywords > modelling, safety, SIC control rod

Research Unit > IRSN/DPAM/SEMIC

Authors > DUBOURG Roland, PLUMECOCQ William

Publication Date > 14/11/2005


Experimental and theoretical studies have shown the potential of structural material aerosols to react with fission products, affecting their speciation and deposition, and thus the source term associated with a severe reactor accident. Since a PWR contains up to 2 tons of Silver-Indium-Cadmium (SIC) alloy (a neutron absorber in control rods), it is very important to understand and model the behaviour of this material (particularly silver, which is likely to react with iodine, a major contributor of the source term).
For several years, experiments have been performed in different countries to study the degradation of SIC control rods under severe accident conditions, and the release of gaseous species and aerosols during and after this degradation. Data from these dedicated experiments and from general thermodynamic databases have been used to develop models for control rod degradation and SIC release.
Comparisons between models and experimental data have shown some discrepancies. Uncertainties arise particularly concerning the interactions amongst the relocation of molten materials (disposition of the absorber material in-core) and the chemical and thermal conditions of the absorber and surrounding atmosphere.
Cooperative efforts are being made to understand the phenomena better by comparing the experimental results and models used in different computer codes, and hence to progress towards better models of the relevant processes. The present study aims to be a significant step along this way.

(1) : EDF
(2) : GRS
(3) : IRSN
(4) : PSI

Send Print


More about


Send to a friend

The information you provide in this page are single use only and will not be saved.
* Required fields

Recipient's email:*  

Sign with your name:* 

Type your email address:*   

Add a message :

Do you want to receive a copy of this email?