Underwater Photogrammetric Verification of Nuclear Fuel Assemblies via Natural Feature Measurement

Abstract

Three things a photogrammetrist never wants to hear are underwater, nuclear and natural feature – and this job was all three. The customer needed the XY location of 177 hold-down plates submerged in a reactor cell, a further 708 circular features on those plates, and the fixed references that tie them together, all without targets. The presentation covers the camera protection and calibration problems that water introduces, the radiation risk to the electronics, and the accuracy that natural-feature measurement can be held to in those conditions.