NOVELTY - A fuel cell electric power generation system comprises hydrogen generating apparatus (1) provided with modifier for reforming-reacting raw material and steam which generates hydrogen-containing gas, combustor which burns hydrogen-containing gas discharged from fuel cell and heats modifier, catalyzed combustion-type carbon monoxide detector which detects carbon monoxide concentration in combustion exhaust gas discharged from combustor, and combustion detector which detects combustion state of combustor.    USE - Fuel cell electric power generation system.    ADVANTAGE - The fuel cell electric power generation system can ascertain combustion bad status correctly with little incorrect detections by reducing reactivity of catalyst of carbon monoxide detector.    DETAILED DESCRIPTION - A fuel cell electric power generation system comprises hydrogen generating apparatus (1) provided with modifier for reforming-reacting raw material and steam which generates hydrogen-containing gas, material supply part which supplies raw material to hydrogen generating apparatus, fuel cell (5) which is generated using hydrogen-containing gas supplied from hydrogen generating apparatus, combustor which burns hydrogen-containing gas discharged from fuel cell and heats modifier, catalyzed combustion-type carbon monoxide detector which detects carbon monoxide concentration in combustion exhaust gas discharged from combustor, combustion detector which detects combustion state of combustor, and control part which reduces energizing amount to carbon monoxide detector from case in which combustion is being detected in combustion detector when combustion is not detected in combustion detector but hydrogen-containing gas or raw material is supplied to carbon monoxide detector.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of the hydrogen generating apparatus. (Drawing includes non-English language text).    Hydrogen generating apparatus (1)    Booster pump (2)    Raw material flowmeter (3)    Water feed pump (4)    Fuel cell (5)