When preparing a Permit-Required Confined Space (PRCS) for entry, either by reclassification or by permit, it is incumbent upon the Entry Supervisor to ensure that ALL forms of hazardous energy has been identified and properly isolated. In this event, the vessel had a level indicator that used a radiation source of energy that was not identified, leading the entrant(s) to receive a radiation dose. Speaking from experience, these devices have shutters that can be closed and locked closed as part of the Energy Isolation Plan (LOTO) for the PRCS.
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