A remote, robotic method of mitigating damage to an Independent Spent Fuel Storage Installation (ISFSI) canister has been developed and tested. It is currently ready for implementation if required for a vertical canister system and will be ready for implementation in 2020 for a horizontal canister system. The development was in response to State of California directives to be ready and able to implement a canister repair technology if needed at San Onofre Nuclear Generating Station.

The method was developed by miniaturizing existing cold spray technology and combining it with robotics previously used on site. The Metallic Overlay method (also known as ‘Cold Spray’) has been tested and accepted for use at San Onofre.

The testing involved the miniaturization of the Metallic Overlay Equipment, testing of several metals which were considered for use, the decision process for the down-selecting of the chosen material, the combining of mitigation tooling and robotics, and the final testing and qualification of the process. This paper will also discuss the details needed to implement on site.

This paper will focus on the development, testing and implementation of the miniature robotic platform and the metallic overlay equipment/process. The background leading to the development of the overlay process will be provided, and will note the tie to (in development) Code Case N-860[1], which would indicate the conditions that would occur to direct the site towards implementation of the metallic overlay process.

The process has been developed in advance of a specific need. It is a proactive action intended to allow efficient response in the event mitigation is required at San Onofre.

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