Japan Electric Association Code

In Japan, the Japan Electric Association Code, JEAC 4201, Method of Surveillance Tests for Structural Materials of Nuclear Reactors (JEAC 4201, 2007), specifies the design for a surveillance program to monitor radiation-induced changes in mechanical properties of beltline materials in light-water moderated nuclear power reactor vessels testing and evaluation of the test results. The JEAC 4201 was developed based on the ASTM E 185 for nuclear power RPVs for which the predicted maximum neutron fluence at the end of the operating period (usually 32 EFPY unless otherwise identified) exceeds 1 x 10 n/cm" E > IMeV) at the inside surface of the reactor vessels. 

The basic inspection requirements are given in the JEAC-4205, the Japan Electric Association Code for ISI of light water cooled nuclear power plant components [6.29]. The basic examination required by above code is a periodical visual examination of the reactor internal structures (Section 2, Class 1 Components, Examination Category B-N-3). The objective of the visual examination is to discover relevant conditions including distortion, cracking, loose or missing parts, wear or/and corrosion. The examination is performed once every 10 years, using an examination tool coupled with underwater TV camera. The result of this one is recorded on videotape. 

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