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Nuclear Engineering
Japan Earthquake: nuclear plants Fukushima part 2
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[QUOTE="tsutsuji, post: 4516568, member: 321287"] [url]http://www3.nhk.or.jp/news/genpatsu-fukushima/20130926/1145_minaoshi.html[/url] As a follow-up of the stack crack problem, the NRA instructs Tepco to revise the assumed maximum earthquake. Before the accident, the stack had been assessed as being safe under the assumed maximum earthquake. For that purpose, Tepco will make plans to investigate active faults. If the assumed maximum earthquake is revised, all earthquake safety assessments, for example of reactor buildings, have to be done again. [url]http://www3.nhk.or.jp/news/genpatsu-fukushima/20130926/1145_saikai.html[/url] Water treatment facility ALPS's hot testing has been started again today. It had been suspended as a consequence of a leak, which had been caused by corrosion. The test is starting on the line where corrosion countermeasures have been implemented. The other two lines will be started one after another, starting in mid-November. The resulting treatment capacity will be 500 ton/day. Under the government funded plans, the treatment capacity will be brought to 1500 ton/day within next fiscal year. However there is still no decision taken concerning what to do with the resulting tritiated water. [url]http://www3.nhk.or.jp/news/genpatsu-fukushima/20130926/1145_tunk.html[/url] (26 September 2013) Tepco found a gap between bottom plates on the location where loose bolts had been found. The gap was found by using a chemical that makes bubbles and by watching the bubbles being sucked into the gap. [url]http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2013/images/handouts_130920_09-e.pdf[/url] (20 September 2013) Investigation of the Inside of Tank No.5 in H4 Area [url]http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130830_10-j.pdf[/url] (30 August 2013) H4 area tank leakage (36 pages, Japanese) [url]http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130926_04-j.pdf[/url] After a qualification test on 20 September, on 24 September a robot measured water level inside unit 2 suppression chamber. The results are currently being assessed. [url]http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130912_11-j.pdf[/url] (12 September 2013) Qualification test for the suppression chamber inner water level measurement robots. The robots are equipped with ultrasonic sensors. The test is performed at unit 5. There are two kinds of robots : a fixed type and a moving type. [/QUOTE]
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Japan Earthquake: nuclear plants Fukushima part 2
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