A1 Journal article (refereed), original research

Analyses of PACTEL passive safety injection experiments
with APROS, CATHARE and RELAP5 codes


Publication Details
Authors: Tuunanen Jari, Vihavainen Juhani, D’Auria Francesco, Frogheri Monica, Galassi G M, Kimber George, Lillington John, Alien Elizabeth, Williams T G
Publication year: 2000
Language: English
Related Journal or Series Information: Nuclear Engineering and Design
Volume number: 198
Issue number: 3
JUFO-Level of this publication:
Open Access: Not an Open Access publication

Abstract
The European Commission fourth framework programme project ‘Assessment of passive safety injection systemsof advanced light water reactors' involved experiments on the PACTEL test facility and computer simulations ofselected experiments. The experiments focused on the performance of passive safety injection systems (PSIS) ofadvanced light water reactors (ALWRs) in small break loss-of-coolant accident (SBLOCA) conditions. The PSISconsisted of a core make-up tank (CMT) and two pipelines. A pressure balancing line (PBL) connected the CMT toone cold leg. The injection line (IL) connected it to the downcomer. The project involved 15 experiments in threeseries. The experiments provided information about condensation and heat transfer processes in the CMT, thermalstratification of water in the CMT, and natural circulation flow through the PSIS lines. The project includedvalidation of three thermal-hydraulic computer codes (APROS, CATHARE and RELAP5). The analyses showed thecodes are capable of simulating the overall behaviour of the transients. The codes predicted accurately the coreheatup, which occurred when the primary coolant inventory was reduced so much that the core top became free ofwater. The detailed analyses of the calculation results showed that some models in the codes still need improvements.Especially, further development of models for thermal stratification, condensation and natural circulation flow withsmall driving forces would be necessary for accurate simulation of the phenomena in the PSIS.

Research Areas

Last updated on 2017-22-03 at 15:49