Certain things will never change, nuclear accident or not.
From Jiji Tsushin (6/21/2012):
Responding to the criticism in delay in announcement regarding Ooi Nuke Plant, NISA says if an alarm sounds it will be promptly announced
About the delay in announcing the alarm at the generator cooling system of Reactor 3 at Kepco's Ooi Nuclear Power Plant which is being prepared for the restart, the Nuclear and Industrial Safety Agency under METI decided on a new rule on June 21 that "if an unexpected alarm sounds, it will be promptly announced regardless of the effect on safety".
At Ooi Nuclear Power Plant, an alarm sounded at about 9:50PM on June 19 indicating the water level decreased in the tank of the generator cooling system. KEPCO decided that there was no effect on safety, and obtaining the consent from the NISA to do so announced the event in the morning of June 20, more than 10 hours after the event.
There was also a leak at the pump in the cooling system at Reactor 3 on June 19, and KEPCO also waited until June 20 to announce. According to Sankei Shinbun (6/21/2012):
KEPCO announced on June 20 that there was a slight leak of water from the part of the pump that transfers water from the generator cooling system tank. [According to KEPCO,] the leak had no effect on the water level decrease in the tank on the night of June 19, and there was no effect on the environment.
According to KEPCO, a worker was inspecting the area around the generator cooling system tank of Reactor 3 at about 10PM on June 19, when he noticed a minute amount of leak.
The water leak was from the tube that removes foreign matters in the water running through the pump.
KEPCO has tighten the bolt at the connection of the tube, and is considering replacing it.
According to KEPCO's press release, the leak was 0.02cc/second. The press release has a PDF file with a diagram of the system, but it is hard for me to figure out what is what. The location of the leak is not immediately clear, and there is no photograph of the actual leak. It looks KEPCO needs to learn a little bit from TEPCO when it comes to communicating with the outside world. TEPCO's communication skills have improved over the past year under the unfortunate circumstance.
(I don't want to be too familiar with a pressurized water reactor. I don't want to do a self-inflicted crash course on one, like I did on the boiling water reactors in Fukushima as they blew up. Don't start Ooi Nuke Plant. I don't have time to learn a new reactor type. I don't want to even learn about a turbine generator. Don't do it. Learning a little about Mitsubishi's steam generators is already too much...)