日本福岛核电站一号机组事故序列

目前福岛核电站发生的爆炸是厂房内氢气爆炸，导致厂房倒塌，压力壳及安全壳还未受到损坏。

Recognizing that information is still not complete due to the destruction of the communicationinfrastructure, producing reports that are conflicting, here is our best understanding of the sequence ofevents at the Fukushima I‐1 power station.

美国核学会的同志们本着严谨求实的态度，把他们目前掌握的关于福岛第一核电站一号机组的事件发生序列罗列在此：

The plant was immediately shut down (scrammed) when the earthquake first hit. The automatic power system worked.

地震发生，核电站停堆，自动供电系统启动。

All external power to the station was lost when the sea water swept away the power lines.

海水冲走供电线路后，失去所有外电源。

Diesel generators started to provide backup electrical power to the plant’s backup cooling system. The backup worked.

柴油发电机为核电站的后备冷却系统供电，后备冷却系统启动。

The diesel generators ceased functioning after approximately one hour due to tsunami induced damage, reportedly to their fuel supply.

海啸发生一小时后，柴油发电机停机，据说是燃料供应被海啸损坏。

An Isolation condenser was used to remove the decay heat from the shutdown reactor.

启用隔离冷凝器从已停堆的反应堆中导出衰变热。

Apparently the plant then experienced a small loss of coolant from the reactor.

反应堆失去少量冷却剂。

Reactor Core Isolation Cooling (RCIC) pumps, which operate on steam from the reactor, were used to replace reactor core water inventory, however, the battery‐supplied control valves lost DC power after the prolonged use.

启用堆芯隔离冷却泵，主要操作反应堆蒸汽，用于更替堆芯冷却剂，但是，在长时间使用后，电池供电控制阀失去直流电源。

DC power from batteries was consumed after approximately 8 hours.

直流电源供应近8个小时。

At that point, the plant experienced a complete blackout (no electric power at all).

此时，核电站进入完全停电状态。

Hours passed as primary water inventory was lost and core degradation occurred (through some combination of zirconium oxidation and clad failure).

若干小时之中，一回路水流失，堆芯出现化学降解，主要是燃料包壳损坏和锆氧化。

Portable diesel generators were delivered to the plant site.

移动柴油发动机运达核电站。

AC power was restored allowing for a different backup pumping system to replace inventory in reactor pressure vessel (RPV).

交流电力系统恢复使用，另一备用泵系统启动，用以更换反应堆压力壳内冷却剂。

Pressure in the containment drywell rose as wetwell became hotter.

随着湿井温度上升，安全壳干井内压力上升（压水堆安全壳包含干井和湿井两部分）。

The Drywell containment was vented to outside reactor building which surrounds the

containment.

安全壳干井泄压，排出气体到包围安全壳的反应堆外部厂房。

Hydrogen produced from zirconium oxidation was vented from the containment into the reactor building.

锆氧化产生的氢气从安全壳被排泄到反应堆厂房中。

Hydrogen in reactor building exploded causing it to collapse around the containment.

氢气爆炸导致反应堆厂房在安全壳的附近倒塌。

The containment around the reactor and RPV were reported to be intact.

据报道，反应堆安全壳及压力壳完好无损。

The decision was made to inject seawater into the RPV to continue to the cooling process, another backup system that was designed into the plant from inception.