Tom Palmisano, the Southern California Edison vice president of decommissioning and chief nuclear officer, holds a “shim,” a device used to improve the airflow in canisters designed to hold spent nuclear fuel, at the June 27 Community Engagement Panel meeting. Palmisano explained what happened a few months ago when a couple canisters with broken shims were loaded with spent nuclear fuel at San Onofre Nuclear Generating Station, where the decommissioning process is currently taking place. Photo: Eric Heinz