OREANDA-NEWS. April 05, 2011. Today at around 9:30 am, we detected water containing radiation dose over  1,000 mSv/h in the pit* where supply cables are stored near the intake  channel of Unit 2. Furthermore, there was a crack about 20 cm on the  concrete lateral of the pit, from where the water in the pit was out  flowing. At around 12:20 pm, we reaffirmed the event at the scene. We have implemented sampling of the water in the pit, together with the  seawater in front of the bar screen near the pit. These samples were sent  to Fukushima Daini Nuclear Power Station for analysis. (We already  informed on April 2nd, 2011)

Afterward, we implemented sea water sampling at the inside of the pit and  in front of the bar screen near the pit. We made radionuclide analysis  and found radioactive materials (For details to Appendix). Therefore, we  reported to Nuclear and Industrial Safety Agency (NISA), Ministry of  Economy, Trade and Industry (METI), and Fukushima prefecture respectively.

We considered announcing 3 type of nucleus (iodine- 131, cesium-131, and  cesium-137) as definite value at the result of the analysis. In addition,  we will re-evaluate other type of nucleus based on the preventive measures  under a strong warning of NISA on April 1st,

We will implement the countermeasure continuously in order to prevent  radioactive materials influx to the sea from near the pit.

*pit: a shaft made of concrete