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Section 4.5.6, System design

The applicant should present relevant information for the system description, pressure-retaining SSCs, equipment environmental qualification, electromagnetic interference, seismic qualification, and fire safety/fire protection.

System description

The applicant should provide, in detail, the characteristics and major components of the system and its design basis requirements (for example, the functional and performance requirements associated with the definition of design basis).

Pressure- or fluid-retaining structures, systems and components

The application should describe the basis for the design of the pressure- or fluid-retaining SSCs and their supports, in accordance with section 7.7 of REGDOC‑2.5.2, Design of Reactor Facilities: Nuclear Power Plants [9]. The application should also describe the pressure boundary standards and codes (and their editions / effective dates). It should also describe the overall pressure boundary program, including its implementation processes and procedures. In addition, the application should describe the service agreement with a recognized authorized inspection agency and the related pressure boundary quality assurance program.

Equipment qualification

The applicant should provide detailed processes and specifications for an equipment qualification program. The program should identify equipment service conditions. The application should demonstrate that equipment can perform its intended safety functions under the environmental conditions defined for all plant states in which it is credited.

The application should include the designated functional requirements, the definition of the applicable environmental parameters, and the documentation of the qualification process used to demonstrate that the required equipment is capable of meeting the requirements in accordance with sections 5.7, 7.3, 7.5, 7.8 and 7.14 of REGDOC‑2.5.2, Design of Reactor Facilities: Nuclear Power Plants [9].

For SSCs important to safety, the application should include a description of how aging effects due to service life are taken into account.

Electromagnetic interference

The applicant should demonstrate that instrumentation and electrical equipment of SSCs important to safety are protected from electromagnetic interference (EMI)-induced faults for all plant states in which they are credited.

The information submitted should meet the requirements in accordance with section 7.9 of REGDOC‑2.5.2, Design of Reactor Facilities: Nuclear Power Plants [9] and also demonstrate the capability, as specified in the design, of instrumentation and electrical equipment to function within the applied electromagnetic environment of the reactor facility in different plant states, and without introducing significant electromagnetic disturbances to other equipment within the reactor facility.

The application should include the layout strategies for grounding and shielding, and should also provide EMI-qualified device handling and storage requirements.

Seismic qualification

The application should describe how the reactor facility design protects SSCs (including building structures) from earthquake damage, and how the approach is in accordance with section 7.13 of REGDOC‑2.5.2, Design of Reactor Facilities: Nuclear Power Plants [9]. The applicant should ensure there is instrumentation available to monitor seismic activity at the site for the lifecycle of the reactor facility.

SSCs important to safety should be designed to withstand a design-basis earthquake (DBE) event. For a beyond-design-basis earthquake, the applicant should demonstrate that there is a high confidence of low probability of failure of the SSCs that are credited to function during and after the event.

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