What are different service loads according to ASME Section III Division I subsection NF?
What do service level A B C and D represent in ASME Section III Division I subsection NF?
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What are different service loads according to ASME Section III Division I subsection NF?
ASME Section III Division I subsection NF standard is for the design of supports for nuclear components.
Service Level-A, B, C, and D represent the different loading conditions on the nuclear supports at various operating conditions.
Service Level-A :
Service Level-A represents Normal Operating Conditions including start-up and shutdown.
Design loads in Service Level-A: Deadweight, thermal expansion and internal pressure.
Service Level-B:
Service Level B represents an upset condition. It is a slight deviation from normal operating conditions. It includes events like loss of power supply, loss of flow and minor equipment malfunction.
Design loads in Service Level-B: Service Level-A loads + loads arise due to the above-mentioned events.
Service Level-C:
Service Level-C represents potentially severe events that should be accommodated without loss of pressure coolant boundary and core cooling capabilities of a nuclear reactor.
Design loads in Service Level-C: Service Level-B loads + loads arise due to the above events + anticipated seismic events.
Service Level-D:
Service Level-D load represents faulted conditions which are extremely severe and unlikely events like severe earthquakes and pipe breaks.
Design Loads in Service Level-D: Service Level-C loads + loads arise due to the above events.