THE FlRST ATOMlC POWER INDUSTRY GROUP
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■ FAPIG Activity
Cover Design：Toshiyuki Shimamura
"Einstein", "Heidi", "Federer", "Wawrinka" and "Permanent Neutral Country". Though these are examples related to Switzerland/Swiss, there might be difficult for many people to imagine what Switzerland is like or what typical Swiss thinks in their mind. As I had a chance to stay at ETH Zurich as a researcher by taking advantage of company internal go-abroad education system, I stayed at Zurich for two years together with my family. I would like to report the way of living in Switzerland, education and work which are different from those in Japan.
KEYWORDS：Switzerland, Sechselauten, ETH Zurich
Kazuhiro Koga, Kazunori Suzuki, Tomoharu Hamano, Tsuyohiko Takagi Prototype Fast Breeder Reactor "Monju" Decommissioning and Unloading Operation of the Fuel Assembly from the Core FAPIG No. 194 pp.6 to 11 (2018)
The prototype fast breeder reactor "Monju" was decided to decommission
policy by Japanese government on 21 December 2016. After that, Japan
Atomic Energy Agency (JAEA) submitted "Monju decommissioning basic plan"
to MEXT (Charge ministry) on 13 June 2017, then the unloading operation
period (about 5.5 years) of the fuel assembly, which is the first stage
of decommission, has started.
KEYWORDS：fast reactor, Monju, decommission, unloading
Naoki Uchiyama, Tatsuya Ozawa, Kouji Satou, Jun Kobayashi, Takamitsu
Onojima, Masaaki Tanaka
Japan Atomic Energy Agency (JAEA) aims to diversify the decay heat
removal system as the moderating approach of severe accident progress
in order to sophisticate the safety of the sodium cooled fast reactor.
JAEA is progressing the enhancement of Plant Dynamics Test Loop (PLANDTL)
in Oarai Development and Research Center. JAEA will demonstrate the
heat and flow phenomena at the decay heat removal by natural convection
in the reactor vessel by using PLANDTL.
KEYWORDS： decay heat removal system for sodium cooled fast reactor, plant safety research, severe accident
In nuclear power plants, it is needed to keep the water quality of
reactors or steam generators extremely clean from the viewpoints of
the reduction of the radiation exposure and maintenance of the reliability
of plant materials. In order to meet these requirements, the role of
the condensate demineralizers and the ion exchange resins are very important.
Furthermore, the requirements of water quality have been upgrading compared
to them in 1970's.
KEYWORDS：ion exchange resins, condensate demineralizers, regeneration system