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

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Barriers to Fission Product Release 1) Uranium-Dioxide Fuel Matrix & 2) Sheath 3) Primary Heat Transport System, 4) Containment & 5) Boundary 24-May-01 CANDU Safety - #12 - Large LOCA.ppt Rev. 0 22
Fission Product Release λ The gap inventory plays a key role in the fission products released released during the transient (i.e., sheath failure ==> retention & transport transport of fission products in the gap ==> released to heat transport system) system) λ Secondary release phenomena may include diffusion, fuel oxidation, Zircaloy-UO Zircaloy UO2 reaction and fuel cracking λ LOCA Methodology – Entire gap inventory is assumed to be released upon sheath failure failure – 1% of fission products residing on grains and grain boundary is assumed to be released: to account for the possibility of secondary release mechanisms λ Fission Product Retention in Heat Transport System – large surface area in primary heat transport system (for example, example, endfitting, feeders) for fission product deposition – The retention of fission products in the system are currently not not credited in the analysis; however, plan to credit in the future 24-May-01 CANDU Safety - #12 - Large LOCA.ppt Rev. 0 23
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 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: Temperature ( o C) 1000 900 800 700
Page 25: Pressure (kPa(g)) Containment Behav

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

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