Abstract
The paper briefly reviews the behaviour of WWER type fuel rods studied under conditions of a high rate of power rating of fuel; the investigations were carried out to validate the licensing criteria with the aim of assessing design basis reactivity initiated accidents (RIA).The procedure used to calculate thermomechanical and corrosion behaviour of fuel rods in accidents is described.The results acquired from the analysis of the thermomechanical condition of WWER-1000 fuel rods in a design basis reactivity initiated accident caused by an ejection of a regulation element of the control and protection system (RE CPS) are discussed.The aim of the analysis is to validate the fulfillment of specific safety requirements imposed on fuel rod condition in design basis accidents.Consideration is given to accidents attended with a rise of fuel rod (fuel and/or cladding) temperature in comparison to the state under normal operating conditions. This may proceed from deterioration of heat transfer from fuels, e.g., in accidents due to loss of the coolant by the primary circuit or an increase in power rating of fuel in RIA.Design procedures have been worked out to simulate fuel rod behaviour in accidents, which were implemented in the RAPTA-5 fuel performance code. Using the latter, design analysis of fuel rod behaviour under design RIA conditions is implemented; its results serve to draw conclusions whether acceptance criteria are fulfilled.The results of the RAPTA-5 code design analysis of the thermomechanical state of WWER-1000 fuel rods in that accident have demonstrated the fulfillment of all the acceptance criteria.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
