Facility personnel examined the door and found that it jammed and jumped off its track as a result of this event. They also determined that the door closure time is 6 to 24 seconds as required by the National Fire Protection Association. No signs or floor markings were present in the area to warn personnel of the potential for the door to close. The facility manager will continue to review this event and will develop corrective actions as necessary. NFS has also reported system anomalies caused by maintenance or testing in several Weekly Summaries.
Some examples follow.
The breaker also supplied power to the facility criticality system tone generator. However, they did not use a work package to perform the repair, and no one performed a post-maintenance test to verify system operability. Weekly Summary 98-38 reported that fire department personnel at the Hanford Site Plutonium Finishing Plant were performing a Halon system functional test when the Halon system discharged. The discharge occurred when electricians disconnected wires from a Halon tank pressure-monitoring instrument instead of a Halon discharge actuator. They were working under a generic work package for preventive maintenance of site fire protection systems.