In-vessel underwater laser scanning has been used during a recent outage at to at Nine Mile Point 1, one of the oldest reactors in the United States, to inspect the steam dryer assembly and support brackets.
Newton Labs, which manufactured the NM200UW Nuclear Underwater Laser Scanner, said that the equipment was deployed by a two-man team during an outage in mid-April.
During the Nine Mile Point outage the laser scanner was attached to a PT200UW Robotic Pan-Tilt Arm, also by Newton Labs, enabling it to be inserted horizontally into the steam dryer, located the dryer/separator pit (DSP) adjacent to the core. Next, the scanner and arm assembly, coupled to a 40-foot long pole, was used to scan in-vessel support brackets.
The equipment and arm both functioned as designed, despite being submerged in radioactive, 110° core water over several days, Newton Labs said.
The vendor added that the scanner allowed the crew to complete tasks while working in close proximity to the other teams within the DSP and over the core, allowing the critical path to be maintained.
Nine Mile Point Unit 1, a General Electric boiling water reactor first entered service in 1969.