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Full insertion of the control rods on receiving a scram signal takes a few seconds. That is what will have happened at Fukushima, when the earthquake struck. However there is some afterheat produced in the fuel rods, as a result of the radioactivity of the fission products. This is initially about 5% of the full reactor power, but falls off rapidly in the first 24 hours or so. Since the main reactor feed pumps will have probably lost their electrical supplies in the incident, smaller pumps are provided for emergency backup cooling, and for reliability these are supplied from diesel generators. My understanding is that these pumps and their diesel supplies survived the earthquake, but were then knocked out by the tsunami which arrived some time afterwards.

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