When you have an event, the reactor is operating at full power, you blowdown the primary coolant which is hot, you start injecting emergency core cooling water which is cold.
Once you start damaging the core, you are then releasing radioactive material into the coolant and thereby increasing the chances that something travels outside the reactor.
一旦你开始破坏核心，你就会向冷却剂中释放放射性物质，从而提高了这些物质泄露到反应堆外的危险。
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Okay the next issue is reactorcoolant system weld issues. Now this graphic again comes from their website. Now these are all the areas in which there are weld issue problems.