Ltd. The methodology is compared with accident experience as drawn from various accident databases and accident theory.
Maintenance appears to be a particularly important abnormal state.
Whether or not accidents occurring during maintenance or other abnormal states need to be considered explicitly within a QRA study depends on the scope and purpose of the QRA, as well as the complexity of the plant being studied. This is thought to be particularly important for cases where the QRA is to be used for producing recommendations for risk reduction options. HSE priced publications are also available from all good bookshops.