Cable design and construction
Cables are designed according to standards which specify requirements for power, control, thermocouple, and instrumentation cables. Currently, standards also determine final characteristics of cables, following their end-uses, or refer to other national and international standards for properties like resistance to ageing and radiation, LOCA tests, mechanical properties or fire performance.
For other specific demand please feel free to contact us.
Loss Of Coolant Accident (LOCA)
A nuclear plant's safety relies on the safe transfer of heat produced within the reactor vessel to the environment. Most reactor cooling circuits use water as their cooling fluid. One of the most severe accident scenarios involves a leak in the primary cooling circuit. Under this type of scenario, large quantities of radioactive water at high temperature are released within the reactor containment, resulting in high pressure, temperature and radiation. Design-specific emergency cooling and shutdown systems then reduce temperature and pressure until they return to nominal levels. In the meantime, safety-related equipment must continue to operate. Cables qualified to 1E LOCA ensure power is delivered to the equipment and instrument readings are fed back to the control room under these conditions.
The LOCA tests are done in specially equipped autoclaves, allowing the application of prescribed scenarios to the cable samples. Nexans is equipped with its own autoclave, and is able to do the tests beyond the usual specified parameters.
Class 1E LOCA/K1 cables
Equipment installed inside of the containment area, capable of functioning under environmental conditions corresponding to normal, accidental and/or post-accidental plant operating conditions and under seismic load.
Class 1E Non LOCA/K3 cables
Equipment installed outside of the containment area, capable of functioning under environmental conditions corresponding to normal plant operating conditions and under seismic load.
Specific design custom tailored (composite cables, fire resistant cables…) can be provided by Nexans upon request. Feel free to contact us.