Mainichi Shimbun reported further issues at Genkai Nuclear Power Plant in Kyushu. The water leaks follow those at Mihama and Fukushima Nuclear Power Plant last week and a fire yesterday at Tsuruga Nuclear Power Plant (read about it in Fire And Water At Japanese Nuclear Power Plants on Survival Japan). Previous update is available here. It mentioned that there hadn’t been any radioactive material leak, which of course was inexact (although KEPCO tries hard to prove there is no causal link between the leaks and the radiation surge) – incidentally JAPC declared the same regarding Tsuruga today.
About Genkai, claims by the local government that radiation levels ″sometimes rises under natural conditions such as rain″ might be half-truths as radioactive rains are not natural conditions, but it is irrelevant nonetheless in the current nuclear power plant leak context. Besides, ″the usual range of 433 to 472 cpm″ is not harmless – it is about 10 times readings I measured elsewhere in Japan (Cf. Geiger Counter Case Study: Inspector Alert on SurvivalJapan – although results in the post are given in uS/h, in fact 40 cpm was a typical value).
Nuclear power plants in “normal operation” in the US leak a ″little″ amount of radioactivity which operators must report to the NRC. Japanese nuclear power plants are similar although I am not aware of any such reporting in Japan.
Mainichi Shimbun – Radiation rose slightly afterwater leak at Genkai plant
SAGA, Japan (Kyodo) — A radiation reading at Kyushu Electric Power Co.’s Genkai nuclear power plant in Saga Prefecture rose slightly above the usual range after coolant water leaked there Friday, the prefectural government said Sunday.
The reading at an outlet for seawater cooling the No. 3 reactor’s secondary cooling system was 473 counts per minute at 3 p.m. Friday, against the usual range of 433 to 472 cpm, not high enough to immediately impact human health, it said.
On Friday morning, 1.8 tons of primary coolant water containing radioactive materials leaked within the reactor’s purification system. The utility claimed the radiation reading is unrelated to that leak and said it will investigate the cause.
Water used in treating low-level radioactive waste is sometimes discharged from the outlet, but that was not the case Friday, the local government said, adding the reading sometimes rises under natural conditions such as rain.
(Mainichi Japan) December 12, 2011
Original article may still be available at this link.
Further updates with “not so slight levels” or such as “Yukio Edano ordered the last Genkai reactor to shut down” for instance are foreseeable.