In a previous post, we discussed how non-destructive testing methods play a vital role in assessing the integrity of concrete structures. NDT methods help identify potential weaknesses or structural deficiencies early so power generation companies can address them before excessive downtime or loss of power generation capabilities occur. Such methods ensure the safety of the power plant and serve as proof to government agencies that the company is proactive in its monitoring and regulatory compliance programs.
While vital for testing of concrete structures, NDT techniques are just as critical to testing mechanical systems and components such as boilers, heat exchangers, and piping systems. NDT can also be used to verify the integrity of welds and other types of components such as valves and nozzles. These techniques can be applied to a variety of nuclear plant inspections, including metallic and nonmetallic materials.
“NDT techniques are critical to testing mechanical systems and components.”
Such testing can be carried out during new plant construction, routine maintenance or when a particular component is coming to the end of its lifecycle. No matter the situation, testing and inspection are vital to plant operation.
NDT can assess the current condition of a component or system and allow personnel to evaluate whether it is fit for service and the remaining service life. The International Atomic Energy Agency said such evaluation, which can be done with minimal downtime, can help plant personnel develop strategic plans for system maintenance that extend the lifecycle.
According to the IAEA, NDT life extension and life assessment services include:
Types of testing
The U.S. Nuclear Regulatory Commission lists six of the most common methods of NDT, including:
Nuclear plants must supply uninterrupted power to the electrical grid. However, safety is of utmost importance, both that of the general public and plant employees. NDT techniques are proven to fulfill both objectives. Such techniques also meet the goals of enhancing reliability of plant assets. New NDT methods are being developed and used in a variety of applications to achieve more accurate results to aid in safe and reliable operation.
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