The temperature in the morning of 31 January was 4°C of frost. One 20 liter leak was found after 9 AM at the junction of pipes of the system bringing fresh water to the decontamination facility. After 11 PM on 30 January a crack was found on one valve on a pipe which brings water into the reactors, but there was no leak. Junichi Matsumoto said "The plan was to finish the countermeasures by next month. Retrospectively it was too late. We want to hurry up with the countermeasures".