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

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Overview λ Event sequence for a large break loss-of loss of-coolant coolant accident (LOCA) λ Acceptance criteria used to assess the results of the analysis λ Normal operating conditions λ Fuel and pressure tube behaviour during the transient λ Fission product release behaviour λ Containment behaviour 24-May-01 CANDU Safety - #12 - Large LOCA.ppt Rev. 0 2
Large LOCA with ECC Available λ Event Sequence – A large break occurs in a large diameter pipe in PHT, discharging coolant into containment – PHT depressurizes causing coolant voiding and an increase in reactivity – Reactor power increases until the reactor is shutdown on a neutronic trip (i.e., high power, high-rate high rate power) or process trip (i.e., low PHT pressure, low pressurizer level, high containment pressure etc.) – The PHT flow decreases fastest in the core pass downstream of the break; and coolant stagnation occurs – Onset of fuel dryout results in an increase in fuel temperature – Once the PHT pressure is reduced to the ECC activation 24-May-01 CANDU Safety - #12 - Large LOCA.ppt Rev. 0 setpoint, ECC is activated; the two loops are isolated from each 3
Page 1: CANDU Safety #12: Large Loss of Coo
Page 5 and 6: Break in Primary Heat Transport Sys
Page 7 and 8: Large Break LOCA Safety Analysis λ
Page 9 and 10: Transient Temperatures - Thermalhyd
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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