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A study on application of the Lithium-ion battery for coping with extended station blackout

After the Fukushima Dai-ichi accident occurred in Japan in 2011, many countries let nuclear power plant (NPP) licensees to increase battery back-up time to cope with extended station blackout (SBO). In South Korea, it is absolutely required to include the battery back-up time enhancement in the accident management program. Because of limited battery room space and easiness, the licensee mainly considers the load shedding without increased battery capacity. To increase battery capacity, however, lithium-ion battery is considered which requires less space than conventional lead acid battery. In this paper, we presented considerations assuming lithium-ion battery to be used in NPPs as safety class battery and also as power supply for beyond design based event (BDBE). Long term discharge characteristics of lithium iron phosphate (LiFePO4) and lithium nickel-cobalt-aluminum oxide (NCA) are elaborately evaluated through a series of experimental tests.