Safety cases facility description

The Facility Description section of the safety case approach is designed to assist in iderrtilying areas where specificatiorts are critical. See DISK (2000) in Frrrflrer Reading at the end of this chapter. 

The Facility Description does not need to contain detailed procedures, calculations, drawings, or plans, but should contain sufficient information to allow the regulator to assess whether the systems and conclusions presented in the Safety Case are reasonable. General documentary evidence that supports the conclusions reached in the Safety Case should be referenced. An assessor or regulator should be given access to the relevant documentation as necessary. 

One of the primary results of the project is the development of a sophisticated and extensive conceptual model for supporting argumentation in general, and safety cases in particular. This section summarises the key aspects of the conceptual basis for the tool, and also indicates some areas where further progress is required in developing an adequate conceptual structure for developing complex safety cases. The description also indicates what facilities are provided by SAM, although more detailed descriptions are provided in section 4. 

In essence, the safety case is a documented description of the hazards that the operator of a system/facility faces and the means employed to control those hazards. It is the systematic and structured demonstration by a company to provide assurance, through comprehensive evidence and argument, that the company has an adequately safe operation. The company will have identified and assessed the hazards and safety risks and be able to demonstrate that they can manage them to levels which are as low as reasonably practicable. 

A. 1005. All water systems of the facility that have not been described previously shall be discussed in this section. These may include the primary purification system, the service water system, the cooling system for reactor auxiliaries and the primary coolant make-up system. In each case, the information provided should include the design bases, a system description, flow and instrumentation diagrams, a safety evaluation, if required, testing and inspection requirements, and instrumentation requirements. 

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