NB/T 20741-2025 Active Industry standards-Energy

NB/T 20741-2025 The inspection of the penetration piece at the bottom of the reactor pressure vessel

Publish Date: 2025-12-18 Implement Date: 2026-06-18 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: NB/T 20741-2025

Standard Type: Industry standards

Standard Status: Active

is_force_gb: no

CCS Name: Nuclear reactors and nuclear island equipment in nuclear power plants

ICS Name: Nuclear power stations, safety

Publish Date: 2025-12-18

Implement Date: 2026-06-18

Scope

This document applies to ultrasonic, eddy current, and video inspections of the bottom head penetrations (including the bottom head welds and heat-affected zones) of reactor pressure vessels in pressurized water reactors before and during operation. It can also be used as a reference for inspections during the manufacturing phase.