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Database: 189760 (25 Oct 2025)
NB/T 20450.3-2017 English PDF
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NB/T 20450.3-2017
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Alternative welding code for mechanical components of PWR nuclear islands Part 3: Welding procedure qualification
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Basic data
Standard ID
NB/T 20450.3-2017 (NB/T20450.3-2017)
Description (Translated English)
Alternative welding code for mechanical components of PWR nuclear islands Part 3: Welding procedure qualification
Sector / Industry
Energy Industry Standard (Recommended)
Classification of Chinese Standard
F69
Classification of International Standard
27.120.20
Word Count Estimation
87,811
Date of Issue
2017-04-01
Date of Implementation
2017-10-01
Quoted Standard
GB/T 226; GB/T 3375; GB/T 5185; GB/T 19866; NB/T 20003; NB/T 20004-2014; NB/T 20009; NB/T 20328-2015; NB/T 20450.1-2017; NB/T 20450.2-2017; NB/T 20450.4-2017
Regulation (derived from)
National Energy Board Bulletin 2017 No. 7; Industry Standard Filing Announcement 2017 No. 9 (Total No. 213)
Issuing agency(ies)
National Energy Administration
Summary
This standard specifies the butt weld and fillet weld welding process qualification, special weld process qualification, hardfacing and corrosion resistant surfacing process evaluation, heat exchange tube and tube sheet welding of nuclear island machinery and equipment of pressurized water reactor nuclear power plant. Process evaluation, tempering bead welding process qualification rules, test methods and qualification criteria. This standard applies to electrode arc welding (111), submerged arc welding (12), tungsten inert gas shielded arc welding (141), molten inert or non-inert gas shielded arc welding (131, 135), inert or non-inert gas Welding methods such as flux-cored wire arc welding (137, 136), plasma arc welding (15), electron beam welding (51), laser welding (52), and electroslag welding (72) surfacing.