Engineering study on decommissioning of heat exchangers in Tokai power station

Nuclear development in Japan has been continued for longer than half a century. Some nuclear facilities and power plants were built at the dawn and some of them finished their own missions. These facilities and plants are planned to be decommissioned in sequence. The Japan Atomic Power Company's (JAPC) Tokai Power Station (TPS) is the first commercial nuclear power plant in Japan, and JAPC finished its operation in 1998. Now TPS has kept safety storage period. Kawasaki Plant Systems (K-Plant) took part in the construction of TPS and had maintained some facilities until the end of the operation. Therefore JAPC and K-Plant have continued decommissioning investigations for more than 20 years. This report shows the decommissioning technology for primary loop heat exchangers (Steam Raising Unit, SRU), which K-Plant made. JAPC will apply remote cutting system and jack down system as the SRU dismantling method. K-Plant plans demolition works along JAPC's direction. (author)