Risk assessment of plant status under shutdown conditions

RISK ASSESSMENT OF PLANT STATUS UNDER SHUTDOWN CONDITIONS 

In view of the number and diversity of activities carried out during the shutdown period, the plant management should pay special attention to the plant configuration. It should take into account the risks involved at each stage of the shutdown and of the return of equipment and systems to operational states if this is required by the operating mode. Typical areas to be controlled and monitored are  

The risk assessment should cover in particular those activities that have a significant influence on the level of risks at the plant, for example, mid-loop operation of a pressurized water reactor. Use should be made of the results of probabilistic safety assessments for the shutdown mode if these are available. Any specific training needs, special procedures for the shutdown mode or additional operating procedures or surveillance necessary should be identified in the risk assessment. 

The sequencing of work should be reviewed in order to ensure that risks arising from concurrent activities are controlled and minimized. 

---