Boiling Water Reactor 涕水式反應堆 In a Boiling Water Reactor operating In a Boiling Water normally, water is fed in to cool the fuel rods, steam builds up and is released Reactor operating through a turbine and generator and sent out as electricity normally, water is fed in to cool the fuel rods Steam -l Turbine steam builds up and is released through a turbine and generator and sent out as e Water electricity. 正常運作的沸水式反應堆 給水冷卻燃料棒’釋放積 聚的蒸氣驅動渦輪發電。 Control rods
Boiling Water Reactor 沸水式反應堆 ◼ In a Boiling Water Reactor operating normally, water is fed in to cool the fuel rods, steam builds up and is released through a turbine and generator and sent out as electricity. ◼ 正常運作的沸水式反應堆， 給水冷卻燃料棒，釋放積 聚的蒸氣驅動渦輪發電
Boiling Water Reactor 涕水式反應堆 But when the cooling 2 But when the cooling breaks down, the fuel rods are exposed and temperatures rise. In breaks down. the fuel an attempt to control the pressure increase workers vented some rods are exposed and through the primary containment vessel temperatures rise Steam vented Steam 但冷卻失靈時,燃料棒外 露,令溫度上升 Control ods
Boiling Water Reactor 沸水式反應堆 ◼ But when the cooling breaks down, the fuel rods are exposed and temperatures rise. ◼ 但冷卻失靈時，燃料棒外 露，令溫度上升
Boiling Water Reactor 涕水式反應堆 In an attempt to control 2 But when the cooling breaks down, the fuel rods are exposed and temperatures rise. In the pressure increase an attempt to control the pressure increase, workers vented some gas workers vented some through the primary containment vessel gas through the primary Steam vented Steam containment vessel 工作人員排放水蒸汽,試 著控制反應爐外殼增加的 壓力 Control ods
Boiling Water Reactor 沸水式反應堆 ◼ In an attempt to control the pressure increase, workers vented some gas through the primary containment vessel. ◼ 工作人員排放水蒸汽，試 著控制反應爐外殼增加的 壓力
Boiling Water Reactor 涕水式反應堆 If the temperature 3 If the temperature increases further. the rods start to melt-and can continue to melt through the base of increases further, the the reacto rods start to melt- and can continue to melt Steam through the base of the reactor 倘使溫度進一步上升,燃 料棒開始熔毀’亦可從反 應爐底部熔毀溢出。 Meltdown Melting fuel can escape through the reactor floor
Boiling Water Reactor 沸水式反應堆 ◼ If the temperature increases further, the rods start to melt – and can continue to melt through the base of the reactor. ◼ 倘使溫度進一步上升，燃 料棒開始熔毀，亦可從反 應爐底部熔毀溢出
. In better times 危機天發 This file photo from Aua.21,2010 shows plutonium uranium mixed oxide fuel rods being placed in a storage pool at the No. 3 ■位於北日本的福島第 reactor of the 核電站正裝置钚鈾混 Fukushima daiichi 氧仁物燃料棒到3號核 nuclear power plant 反應堆。檔案照片攝於 in northern Japan 2010年8月21日
In better times: 危機未發 ◼ This file photo from Aug. 21, 2010, shows plutoniumuranium mixed oxide fuel rods being placed in a storage pool at the No. 3 reactor of the Fukushima Daiichi nuclear power plant in northern Japan ◼ 位於北日本的福島第一 核電站正裝置鈈鈾混合 氧化物燃料棒到3 號核 反應堆。檔案照片攝於 2010年8月21日