The application of Ex-Vessel neutron dosimetry in RPV irradiation surveillance

The Ex-Vessel Neutron Dosimetry can achieve same accuracy level of neutron fluence measurement as In-vessel surveillance capsules. However, it has advantages such as broader surveillance area, more flexible installation and replacement time arrangement, long-term monitoring and lower costs. It is an effective supplemental method of RPV irradiation surveillance and had been widely used both at home and abroad. (authors)