To clarify characteristics of fire resistant cables for nuclear power plants and support their selection and manufacturing

an analysis was conducted on their types

safety classifications

quality assurance grades

and structural designs. A comparison was made between different fire resistance test standards (such as GB/T 19666—2019 and BS 6387: 2013)

and structural verification tests were carried out to explore the impact of structures on performance. In terms of classification

fire resistant cables for nuclear power plants mainly include fire resistant low-voltage power cables

control cables

and measurement cables

with safety classifications such as Class 1E and non-Class 1E

and most quality assurance grades being Q2 and Q3. In terms of structure

fire resistant layer is mainly made of mica tape

and the use of ceramic silicone rubber tape

extruded ceramifiable polyolefin

or halogen-free flame retardant crusting polyolefin for the spray-resistant layer could improve the pass rate of NS fire resistance test specified in GB/T 19666—2019. Selection in different scenarios should be based on environmental characteristics

safety levels

and standard requirements. The study showed that reasonable structural design

appropriate material selection

and compliance with relevant standards could ensure the reliability of fire resistant cables for nuclear power plants in complex environments

providing a reference for their selection and manufacturing.