Counterpart testing and scaling methodologies - Experience gained from CATHARE2 calculations using LOBI and BETHSY test resultsFunded under: JRC-REACTSAFE 6C
Counterpart testing seeks to provide data from different size test facilities for the validation of thermalhydraulic systems codes when predicting notionally similar phenomena at different scales. Understanding such processes allows the scale-independent capabilities of codes to be judged more critically when extended to real reactor systems. Calculations made with the French code CATHARE2 are compared with measured data from two small break LOCA experiments performed in the 1:712 scale LOBI test facility and in the 1:100 scale BETHSY test facility. Deficiencies in modelling interfacial friction in small-scale facilities are found to cause unphysical water hold-up not observed in the experiments, giving rise to adverse vertical density gradients. Coupled with related thermal problems, the combined effect is to inhibit the predicted ECCS refill rates - a situation which could have serious safety implications when predicting full-size reactor plant behaviour.
Bibliographic Reference: Paper presented: NURETH-6, Grenoble (FR), October 5-8, 1993
Availability: Available from (1) as Paper EN 37359 ORA
Record Number: 199311300 / Last updated on: 1994-11-29
Original language: en
Available languages: en