Simulation of pressure tube deformation during high temperature transients

Experimental investigation of transient behaviour of IPHWR under heat up condition

“…The coolant flows through half of the channels in one direction and remaining in the opposite direction. Each fuel channel has 12 fuel bundles and each bundle consists of 19 fuel pins (Majumdar et al, 2004;Gupta et al, 1997;Gera et al, 2010). In 540 MW (e) number of bundles in a channel is 13 and bundle consists of 37 fuel elements (Bajaj and Gore, 2005).…”

Numerical simulation of high-temperature creep deformation in Zr-2.5%Nb pressure tubes of CANDU reactors

“…Combining both models it is possible to have an averaged estimation of the creep and sagging deformations of the PT. More recently, Majumdar et al [12] proposed an one-dimensional (1D) model to estimate the PT deformation by ballonning and sagging under different thermal conditions and internal pressures. They concluded that, at high pressure the ballonning is the only responsible of the PT to CT contact, while at low pressure and high temperature (LOCA conditions) the sagging deformation becomes relevant.…”

“…where T is the temperature and σ the stress computed in terms of the internal pressure in the PT Majumdar et al [12]. Summarizing, Equation ( 6), writing in terms of the displacements u, is solved to obtain the deformations, calculating the stress creep (σ creep ¼ Dðε creep Þ) explicitly by the Shewfelt correlations.…”

Experimental simulation of asymmetric heat up of coolant channel under small break LOCA condition for PHWR

“…The 3-D thermal simulation showed that under the mentioned accident condition fuel bundle, PT and CT gets heated leading to either ballooning or sagging depending on channel internal pressure. Majumdar et al (2004) investigated simultaneous sagging and ballooning deformation behaviour analytically for similar condition. A pressure-temperature map was generated out of this study to give a comprehensive view of the effect of internal pressure and the temperature ramp rate on PT deformation mode (only ballooning, only sagging or combination of both) and PT-CT contact.…”