A HEPA filter bank at the Plutonium Finishing Plant was found in service following installation of new filters before the filter bank had been leak tested and declared operable by the Surveillance Shift Manager (SSM). Imprecise and incomplete communication between the Person-in-Charge (PIC) and the SSM did not allow the SSM to clearly recognize that the filter dampers were open. A Technical Safety Requirement (TSR) was violated because the SSM did not know existing plant conditions.
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