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Section 4.5.1, General considerations

The application should include a general description of the overall conceptual physical design of the reactor facility, the design practices and the safety concepts. The application should also describe the approach followed for the general design of the SSCs. The design should be provided in sufficient detail that independent reviews can be performed as described in section 5.6 of REGDOC‑2.5.2, Design of Reactor Facilities: Nuclear Power Plants [9].

The application should include a comparison of the reactor facility’s design, construction, commissioning and operation with prevailing modern standards and international practices.

For all reactor technologies, the application should address the information in this section to the extent practicable. Any alternative approaches selected or mitigating measures applied should be identified.

The application may refer to information that was submitted previously (for example, in the application for a licence to prepare site). The set of documents that address the requirements in this section should be submitted only once (for the initial application), with few subsequent revisions.

The application should demonstrate that normal operations can be carried out safely such that radiation doses to workers and members of the public, and any planned discharges or releases of nuclear and hazardous substances from the reactor facility, will be within authorized limits.

In addition, the application should demonstrate that the radiation dose limits, release limits of pollutants and safety goals are met.

The application should also describe the programs and oversight in place to ensure that the design is carried out by technically qualified and appropriately trained staff, and is in accordance with the management system program supporting design and in accordance with “intelligent customer” principles. The information should demonstrate that all contractors and subcontractors involved in the design are qualified to carry out their respective activities.

The application should provide information on the support programs that demonstrate the design:

·       conforms to high standards

·       behaves as predicted for novel aspects of the design, materials and use of equipment

·       incorporates the latest developments in knowledge and technology

·       maintains its characteristics during its lifecycle within the bounds accounted for in the design and safety analysis

·       is resistant to the effects of common-cause events and, to the extent practicable, to severe accidents

·       ensures the reactor facility will remain reliable and robust

·       facilitates effective maintenance, operation and decommissioning

Description of structures, systems and components

For each SSC, the application should describe in detail the characteristics, major components and design basis requirements (such as the functional and performance requirements associated with the definition of design basis), including the following information:

·       objective of the system and how it relates to the entire reactor facility

·       design description of the system and its main components with their configuration and their modes of operation, including:

·       functional requirements (for example, postulated demands and required performance for all plant states)

·       the design-basis events that contribute to the determination of the system design requirements, and which design limits are determined by which events

·       interfaces with other systems

·       measures taken to minimize the generation of nuclear and hazardous waste through design

·       any other specific requirements imposed by applicable regulations, codes and standards

·       supporting design documentation and any related documents, such as design requirements of the system

·       cross-cutting programs, such as:

·       safety and pressure boundary code classifications

·       quality assurance

·       seismic and equipment requirements

·       human factors requirements

·       requirements developed to ensure consistency with other systems and the safety analysis

·       the design reliability targets for systems and main components

·       any requirements resulting from operational feedback

·       detailed elements of system design, including, as appropriate:

·       design flowsheets for fluid systems

·       single line diagrams for electrical, and instrumentation and control systems

·       functional block diagrams for logic systems

·       physical location and isometric drawings

·       system boundaries as a function of mode of operation

·       containment boundaries including isolation requirements

·       code classification and classification boundaries for pressure-retaining systems and components

·       seismic categories and seismic boundaries and their interfaces with support systems providing services, such as electric, pneumatic or hydraulic power, cooling, lubrication and sampling systems

·       chemical control specifications

·       operational aspects, such as:

·       operation of the system and its expected performance (including under beyond-design conditions, if important)

·       interdependence with the operation of other systems

·       requirements for technical specifications regarding system operability

·       system testing for availability, reliability and capability, including online health monitoring, reporting and trending

·       maintenance aspects, including:

·       surveillance

·       condition-based preventive maintenance

·       periodic maintenance and overhauls to ensure continued safety performance and to meet design reliability targets throughout the system's qualified life

·       in service inspection specifications, including visual, surface and/or volumetric non-destructive examination for SSCs to confirm that the actual condition of the SSC complies with design assumptions

·       commissioning testing requirements to:

·       demonstrate to the extent practicable that the SSCs meet their performance requirements in all operational states and accident conditions credited in the safety analysis (particularly important for those design features which are new or first of a kind)

·       verify that the SSCs have been correctly installed/constructed

The application should describe any design features necessary to support commissioning tests.

The design information should reflect all design modifications and changes made during previous licensing periods or phases.

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