ASME Section XI
ASME Section XI is the In-Service Inspection (ISI) code for nuclear power plant components, defining periodic inspection intervals, NDT methods, acceptance criteria, and repair/replacement rules for Class 1, 2, and 3 nuclear pressure equipment.
Definition
Section XI defines 10-year ISI intervals with specific inspection scopes. Performance Demonstration Initiative (PDI) qualification is required for UT examiners on critical nuclear components.
Related terms
- ASME Section V — ASME Section V (Nondestructive Examination) is the chapter of the ASME Boiler and Pressure Vessel Code that defines NDT methods, procedures, and personnel qualification requirements for examinations referenced by other ASME construction and in-service codes.
Further reading
nuclear power plant ndt strict standards compliance
More standard terms
ASME Section VIII · ASME Section IX · ASME B31.1 Power Piping · ASME B31.3 Process Piping · ASME B31.8 Gas Transmission and Distribution Piping · ASME B31.4 Liquid Pipelines · API 510 Pressure Vessel Inspection Code · API 570 Piping Inspection Code · API 571 Damage Mechanisms · API 579-1 / ASME FFS-1 Fitness-for-Service
Where this comes up in practice
Terms like this one appear in three places that matter commercially: the written practice that governs how your personnel are qualified, the procedures and technique sheets that define how an examination is actually performed, and the evidence an auditor or client asks for when they want to know why an inspection was accepted. Getting the terminology right is the easy part; being able to produce the qualification record, the calibration traceability and the procedure revision that applied on the day of the inspection is the part that decides audits.
Atlantis NDT provides NDT training and certification against ASNT SNT-TC-1A and ISO 9712, ASNT Level III consulting for written practices and procedure approval, inspection management software that holds qualification, calibration and procedure-revision evidence in recoverable form, and an asset integrity platform that binds inspection results to the asset they describe. Browse the full NDT glossary or ask a Level III directly.