SARRY, a cesium absorption system in the contaminated water treatment complex at Fukushima I Nuclear Power Plant was stopped when the extremely high radiation of 3 sieverts/hour was detected during the operation to exchange the cesium towers.
From Asahi Shinbun (9:37PM JST 8/22/2011):
TEPCO announced on August 22 that a high radiation of about 3 sieverts/hour was detected at Toshiba’s SARRY which was recently introduced as part of the contaminated water treatment system at Fukushima I Nuclear Power Plant. Due to the high radiation, TEPCO could not exchange parts [cesium towers], and the water processing [using SARRY?] had to be stopped.
SARRY started the full operation on August 18. According to TEPCO, workers were exchanging the parts that absorb cesium for the first time in the morning of August 22, when they found a spot with high radiation on a pipe in the system. Unless the radiation level gets lower, the workers cannot exchange the parts. TEPCO is trying to flush out the radioactive materials in the pipe with water.
So, as with Kurion’s system, Toshiba’s SARRY also needs human intervention to exchange highly contaminated cesium absorption towers. Toshiba’s towers supposedly have built-in lead sleeves inside the towers, but it is the pipe that’s radiating 3 sieverts/hour radiation.
Oops. When it comes down to, it is the basic items like pipes, pipe fittings, hoses and pumps that give.