CANDU Safety #12: Large Loss of Coolant Accident - Canteach

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Fuel conditions prior to the onset of the accident – Normal operating conditions is modelled by the ELESTRES computer code – Main Input Requirements λ Fuel element (pellet and sheath) dimensions & properties λ Power/burnup history λ Coolant temperature and pressure – Important Output Parameters λ Fission product distribution (gap, grain boundary and grain bound) λ Internal gas pressure λ Fuel temperatures λ Pellet strain 24-May-01 CANDU Safety - #12 - Large LOCA.ppt Rev. 0 8
Transient Temperatures – Thermalhydraulic behaviour is calculated by the CATHENA circuit model λ Reactor Inlet Header Break (RIH) – 20%, 25%, 30%, 35%, 40% & 100% λ Pump Suction Pipe Break (PS) – 40%, 45%, 50%, 55%, 60%, 70% & 100% λ Reactor Outlet Header Break (ROH) – 80%, 90%, 95% & 100% – A critical break size is identified for each break location and a detailed CATHENA single-channel single channel analysis is performed: λ 35% RIH , 55% PS & 100% ROH 24-May-01 CANDU Safety - #12 - Large LOCA.ppt Rev. 0 9
Page 1 and 2: CANDU Safety #12: Large Loss of Coo
Page 3 and 4: Large LOCA with ECC Available λ Ev
Page 5 and 6: Break in Primary Heat Transport Sys
Page 7: Large Break LOCA Safety Analysis λ
Page 11 and 12: Depressurization in Inlet Headers (
Page 13 and 14: Break Survey for RIH breaks (Flows)
Page 15 and 16: Single Channel Model for 35% RIH Cr
Page 17 and 18: Detailed Fuel Element Analysis λ O
Page 19 and 20: Detailed Fuel Analysis by ELOCA cod
Page 21 and 22: Temperature ( o C) 1000 900 800 700
Page 23 and 24: Fission Product Release λ The gap
Page 25: Pressure (kPa(g)) Containment Behav

CANDU Safety #12: Large Loss of Coolant Accident - Canteach

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