Which document outlines the recommendations for NDT personnel's written practice?

The document that outlines the recommendations for Non-Destructive Testing (NDT) personnel's written practice is SNT-TC-1A. This guideline, published by the American Society for Nondestructive Testing (ASNT), provides a framework for establishing a comprehensive written practice that covers the qualifications and training requirements for personnel performing NDT.

SNT-TC-1A emphasizes the importance of ensuring that personnel are adequately trained and qualified to carry out NDT. It includes recommendations on how to determine the necessary education, experience, and level of qualification for NDT personnel, helping organizations create effective and compliant written practices tailored to their specific NDT applications.

Other options, such as ISO 9712, focus on certification schemes for NDT personnel, while AWS D1.1 is a welding code that primarily addresses welding processes and does not explicitly detail NDT practices or qualification criteria. ASNT CP-189 also pertains to NDT personnel's certification but does not serve as a standalone written practice document like SNT-TC-1A does. Thus, SNT-TC-1A is the correct choice, providing a clear and structured approach for organizations to develop their written practice for NDT personnel.