核電廠在除役階段時爐心之用過燃料棒將會退至用過燃料池中存放，而原本電廠的風險將會從爐心轉移至用過燃料池中。透過除役期間的用過燃料池安全度評估以及Sandia National Laboratories, Vital Area Identification for U.S. Nuclear Regulatory Commission與IAEA Technical Guidance Identification of Vital Areasat Nuclear Facilities給各國對於緊要區域鑑定之建議，制定緊要區域鑑定方法論，分析於除役階段可能遭受的肇始事件、廠內外事件，找出最有可能發生事故的區域或是發生事故最為嚴重的區域，訂定出一套流程，以利國內核電廠進行緊要區的鑑定並且劃分更為精準，得以更有效率的保護重要區域。

At the stage of decommissioning in Taiwan, because of the full spent fuel pool, the dome of reactor will open and the spent fuel rods will stay in the reactor core for a long time. In this stage, the risk of power plant will different form decommissioning stage or operating stage. The situation of transitional stage of decommissioning is like outage stage and decommissioning stage. This study will compare the probabilistic risk analysis of both stage, outage and decommissioning stage, then select useful information by using qualitative analysis and international standards, and then identify the vital areas during transitional stage of decommissioning by Saphire. The probabilistic risk analysis of transitional stage is different form outage stage and decommissioning stage. And this study using vital area identification, it can point out the more important area and the area risk, is different from traditional probabilistic risk analysis, it points out the individual risk of every equipment. Through the vital area identification process, the power plant can protect the important areas during transitional stage more efficiently and precisely.

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