The dismantling of a nuclear vessel became critical when a cutting crew was accidentally exposed to radiation. The origin of the incident was not human error, but a failure of the digital twin. An active pipe, vital to the cooling system, did not appear in the virtual model. By cutting the wrong structure, radioactive material was released. The discrepancy between the digital twin and physical reality nearly caused a catastrophe.
Post-Incident Reconstruction and the Problem of LiDAR Shadows 🛰️
After the incident, the team deployed an emergency LiDAR scan to reconstruct the exact accident scene. The data was processed in Leica Cyclone to generate a high-density point cloud. The investigation revealed that the omitted pipe was not invisible, but was hidden in a shadow of the original scan, created by an adjacent structure. The master model in Bentley ProjectWise had been updated with incomplete data. The technical lesson is clear: a digital twin is only as reliable as the total coverage of its initial capture. Any shadow in the scan can hide critical infrastructure, especially in environments with complex geometries and latent hazards.
Virtual Audit: The Cost of Hiding Reality 💡
This case demonstrates that digital twin validation cannot be a one-time event. The proposed solution involves VR (Virtual Reality) simulations where operators walk through the model before any physical intervention. If the hidden pipe had been detected during an immersive virtual audit, the accident would have been avoided. Blind trust in an incomplete digital twin is more dangerous than having no model at all. Continuous verification and periodic scanning are the life insurance for any high-risk dismantling project.
Is it possible that an incomplete digital twin generates a false sense of security that puts operators' lives at risk, as happened during the dismantling of the nuclear vessel?
(PS: don't forget to update the digital twin, or your real twin will complain)