Nuclear Application Maps (12 of 14) – Duty Stations

A duty station is a role-based function performed on a unit across multiple shifts. It is defined as a combination of a Site, Unit and Function. Examples of a role-based function would be a Shift Supervisor, Control Room Reactor Operator, or Health Physics Technician.

Duty Station Plan defines the role-based functions required during shift operations. You need to configure the duty station plan according to the functional role performed at a plant site and unit. The duty station plan may be specific to one or more plant modes or a Mode Entry Requirement (MER). In the context of configuring you determine what application functions will be relevant to the shift owner as they use the Duty Stations application. You also define the Security Groups whose users can update the duty station or commit readings for it.

In the duty station plan you define the required Qualifications, other role-based functions that belong to the same shift team, and the key components for which a high-level status is to be provided. As part of a duty station the on-shift personnel will perform rounds where meter readings, measurements and observations will be made. There are three types of Meters, continuous, gauge and characteristic. A Condition Monitoring point will need to be set up for the measurement and observations of gauge and characteristic meters. A reading may be performed at Reading Frequencies and may satisfy a particular Surveillance Requirement. There may be valid exceptions why meter readings or observations cannot be made depending on the condition of the monitored component, for example you may not be able to take a valid measurement if the component is stopped. A duty station plan is under revision control.

Duty Station can be considered a log book for the duty station plan. The first shift starts the duty station and it is turned-over to the next shift and this continues until the duty station is stopped or a revision of the duty station plan is needed. At the end of one shift and the beginning of the next there is a turnover process.

During the course of the shift the shift owner records the measurements, meter readings and other observations defined as part of their rounds in the duty station plan. They can also record additional on-demand readings and create communications as a result of values and observations found.

In the narrative log of the duty station the shift owner creates event entries when a new condition or new component position is to be noted. For example, an alarm trips, or a pump is set to a closed position. The shift owner may create a Condition Report from these event entries. To facilitate activities that need to be performed by the next shift the shift owner can indicate that a follow-up is required for the current entry. The next shift owner creates the follow-up event entry.

Notification is a message that must be communicated to, and acknowledged by, a set of recipients. A notification might comprise new information that must be reviewed by duty station shift personnel or an action that must be taken and confirmed by designated staff members. Notifications can be viewed and completed by the duty station shift owner in the Duty Stations application.

An Objective is an order or requirement that needs to be completed during a shift operation, for example change plant mode or complete physical tests. You can report on and update the status of an objective in the Duty Stations application. As part of turnover from one shift owner to another the shift owner can report on the current mode and current milestone of the unit. The shift owner can monitor LCO Tracking actions that need to be performed or Condition Reports that need to be reviewed and they can navigate to the appropriate applications from these records.

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