An experimental study on fire rated cables for the exemption from cable separation requirements

I stated on the fire resistibility of cables for providing fire shutdown capability in nuclear power plant at the Korean Nuclear Society FY '01 Spring Meeting. During the meeting, I was asked if cables' integrity could be maintained under condition that water spray was applying at cables and cable trays were escaped from its position by flame. In accordance with this question, we analyzed the result of tests which is described in IEC 60331 and BS 6387. As one of methods for implementation to conform to separation requirements in nuclear power plant, we reviewed the fire wrapping method by fire barrier having a 1-hour fire resistance rating. However, it costs too much to wrap cables. Therefore, we had tried to find out alterntive to minimize fire wrapping. As a result, we have obtained test results on using fire resistance cable (i.e. NFR-8) which is an affirmative substitution instead of fire wrapping