Document: NUREG-0800
Document ID: eedf1a7c-578e-463a-9608-b06af6312cf1
Document Type: srp
Title: HUMAN FACTORS ENGINEERING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1310/ML13108A095.pdf
Revision Date: 2023-06
Chapter: 18
Section ID: 18.0
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Content:
attachment defines a methodology, applicable to both existing and new reactors, for evaluating manual operator actions. This attachment incorporates, with limited changes, the guidance in Section 3 of Digital Instrumentation and Control (DI&C) Interim Staff Guidance (ISG), DI&C-ISG-05, Revision 1, “Highly Integrated Control Rooms—Human Factors Issues.” It has been generalized to apply to any manual operator action. BACKGROUND This procedure provides generic guidance for reviewing credited manual operator actions. For some applications additional specific guidance is available. These sources are listed below. In general the more immediate the need for an operator action the more detailed the evaluation of the action will be. No time limit has been established beyond which an operator action need not be evaluated because of the diversity of conditions that can potentially affect the successful accomplishment of operator actions. STAFF POSITION Credited operator actions should be demonstrated to be both feasible and reliable, given the time available, and that the ability of operators to perform credited actions reliably will be maintained for as long as the manual actions are necessary to satisfy the analysis assumptions. The time available for manual actions should be based upon the methods and criteria prescribed within the analysis crediting the operator action. The time required for the operator action should be estimated and validated using the guidance of this attachment. To demonstrate that the manual actions are both feasible and reliable, and that the ability to perform the actions reliably within the time available is maintained, the vendor/ licensee/applicant should follow a process of analysis, validation, and long-term monitoring consistent with this attachment. Important human actions as defined by NUREG-0711, “Human Factors Engineering Program Review Model,” and their associated interfaces (controls, displays, and alarms) should be