Operator Manual Action or Manual Operator Action is part of a pre-planned sequence in response to an event. Its specific to a required step when a person needs to perform an action. This is in contrast to an automatic action which is when an instrument detects and activates something.
Discussion on manual action vs automatic action
Automatic is generally more reliable then a human action. So if a plant uses a manual action to accomplish a safety function it receives scrutiny that its trained, practiced, and validated. In regard to a change per 50.59, changing an automatic to manual operator action will normally require NRC approval.
The reason to use manual action instead of automatic is because automatic could result in unnecessary automatic actuation. If time permits, it may be preferred for a person to interpret the plant conditions as valid prior to system actuation. For example, preventing scrams in response to invalid signals.
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ML23320A306 | 22 January 2024 | Turkey Point | Issuance of Amendment Nos. 298 and 291 Regarding Revising the Fire Protection Program in Support of Reactor Coolant Pump Seal Replacement Project | ML23355A249 | 18 December 2023 | | Journal of Cognitive Engineering and Decision Making Special Issue Commentary, a Regulatory Perspective: Have We Done Enough on Grasping Automation Failure? | ML23342A090 | 8 December 2023 | Robinson | Notification of Inspection and Request for Information for NRC Problem Identification and Resolution Inspection | ML23299A266 | 29 November 2023 | Wolf Creek | Issuance of Amendment No. 238 Modified Implementation Date of License Amendment No. 237 | ML23331A497 | 27 November 2023 | Wolf Creek | Supplement to License Amendment Request to Modify the 90-Day Implementation of License Amendment No. 237 | ML23306A265 | 9 November 2023 | | Operator Licensing and Human Factors Branch (Iolb) - Draft Human Factors Team Training Plan | ML23310A051 | 6 November 2023 | Callaway | EIP-ZZ.OO1O1, Addendum 2, Revision 22, Emergency Action Level Technical Bases Document | ML23319A071 | 31 October 2023 | Farley | 1 to Updated Final Safety Analysis Report, Chapter 8, Electric Power | ML23214A287 | 31 October 2023 | | Regulatory Guide RG-1.189, Rev. 5, Fire Protection for Nuclear Power Plants | ML23292A359 | 19 October 2023 | Wolf Creek | License Amendment Request to Modify the 90-Day Implementation of License Amendment No. 237 |
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