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JRM Vol.36 No.1 pp. 71-78
doi: 10.20965/jrm.2024.p0071
(2024)

Paper:

Integration of Multiple Sensors into an ROV for Remote Measurement in the Fukushima Daiichi Nuclear Power Station

So Kamada ORCID Icon and Kazuya Nishimura ORCID Icon

National Maritime Research Institute
6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan

Received:
July 20, 2023
Accepted:
October 31, 2023
Published:
February 20, 2024
Keywords:
Fukushima Daiichi Nuclear Power Station, fuel debris, ROV, neutron sensor, SBP
Abstract

To measure and analyze the distribution and criticality of submerged fuel debris “in situ” in the decommissioning process of the Fukushima Daiichi Nuclear Power Station (1F), we developed a system for remote measurement using multiple sensors consisting of the neutron sensor, the sonar, and the sub-bottom profiler (SBP) mounted on a small remotely operated underwater vehicle (ROV). First, the locations presumed to contain fuel debris were explored based on the information of the water bottom shape obtained using the sonar and the bottom surface substructure obtained using the SBP. Second, the system identified the location of fuel debris by detecting neutrons emitted by spontaneous fissions of fuel debris using the neutron sensor with diamond elements. Simulated fuel debris was placed at the bottom of a test water tank that simulated the pedestal. In the primary containment vessel (PCV) of 1F, and a verification test of remote measurement was conducted using the ROV mounted on the multiple sensors. The desired results were obtained.

Picture of ROV integrated with multiple sensors

Picture of ROV integrated with multiple sensors

Cite this article as:
S. Kamada and K. Nishimura, “Integration of Multiple Sensors into an ROV for Remote Measurement in the Fukushima Daiichi Nuclear Power Station,” J. Robot. Mechatron., Vol.36 No.1, pp. 71-78, 2024.
Data files:
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Last updated on Apr. 05, 2024