Thermalhydraulic Safety Characteristics Of CANDU ... - Canteach

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CANDU Fuel Channelλλλλλ380 horizontally-oriented oriented fuel channelsin coreZircaloy-2.5wt%Nb pressure tubes– 103.4 mm inside diameter– 4.2 mm wall thicknessZircaloy-2 2 calandria tubes– 129 mm inside diameter– 1.4 mm wall thicknessFuel Bundles– 37 fuel elements– Natural UO 2 with Zircaloy sheaths– Centre pin, 6 elements in innerring, 12 elements in intermediatering, 18 elements in outer ring380 inlet end fittings and 380 outlet endfittings– links the feeders and channels24-May-01 CANDU safety - #4 - Thermalhydraulics.ppt Rev. 0 22
Some T/H Safety Features of ChannelsλλPermits the PHT coolant to efficiently remove heat from thefuel with a low pressure drop across the channel and minimizevibration in channelDuring single-channel accidents such as flow blockage andfeeder stagnation break, the accident only affects the single-channel (i.e., degraded cooling conditions in 1 channel out of380 channels, severe fuel temperatures in 1 channel). Theunaffected channels behave similar to a small loss-ofof-coolantaccident (i.e., no fuel failures)24-May-01 CANDU safety - #4 - Thermalhydraulics.ppt Rev. 0 23
Page 1 and 2: CANDU Safety #4:Thermalhydraulic Sa
Page 3 and 4: λλλλλλλPrimary Heat Transpor
Page 5 and 6: Some Safety Requirements of the PHT
Page 10: PHT Pump & MotorSpecificationsλ Pu
Page 13 and 14: SpecificationsλλHeadersInlet Head
Page 15: Loop Isolation for LOCA eventsλλ
Page 18 and 19: Some Safety Requirements of ECCλλ
Page 20 and 21: Pressure and Inventory ControlλλC

Thermalhydraulic Safety Characteristics Of CANDU ... - Canteach

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