For example, when the inner wall of the RPV tube is inspected with a straight probe, the difference between the reference sensitivity adjusted by the concave interview block and the flat test block is close to 15dB.
For example, when RPV takes over the inner wall with a straight probe detection, the concave interview block and flat interview block adjustment of the baseline sensitivity difference of nearly 15dB.
For example, when the RPV nozzle inner wall is tested with a straight probe, the difference of the reference sensitivity between concave test block and plane test block is close to 15dB.