This standard specifies the minimum requirements for in-service inspection of nuclear is and mechanical equipment in pressurized water reactor nuclear power plants. This standard is mainly applicable to safety level 1, 2 and 3 pressure-bearing equipment and their supports in pressurized water reactor nuclear power plants, as well as some non-pressure-bearing nuclear is and equipment, such as reactor pressure vessel lower head penetrations and top cover penetrations, In-service inspection of internal components of the reactor, nuclear fuel assemblies, control rod bundle assemblies, neutron source rods, turban flux measurement finger casings, main pump spindles, etc.; pressurized water reactor nuclear power plants built in accordance with other standards and specifications can refer to the implementation .
NB/T 20312-2014 Referenced Document
GB/T 16702-1996 Design rules for mechanical components of PWR nuclear islands
NB/T 20001 Manufacturing specifications for nuclear island machinery and equipment in pressurized water reactor nuclear power plants*， 2023-05-26 Update
2023NB/T 20312.1-2023 Rules for in-service inspection of nuclear island machinery and equipment in pressurized water reactor nuclear power plants Part 1: General requirements
2014NB/T 20312-2014 Code on the in-service inspections of mechanical components of pressurized water reactor nuclear islands
1996EJ/T 1041-1996 Code on the in-service inspections of mechanical components of pressurized water reactor nuclear islands
1991EJ/T 606-1991 Ultrasonic In-Service Inspection of Reactor Pressure Vessel Welds in PWR Nuclear Power Plants
NB/T 20312-2014 Code on the in-service inspections of mechanical components of pressurized water reactor nuclear islands has been changed from EJ/T 1041-1996 Code on the in-service inspections of mechanical components of pressurized water reactor nuclear islands.