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
CFR Part: 
CFR Title: 

Content:
exists, perform task A). Some tasks may involve coordinated actions among crew members or control room crew members and local personnel. These relationships can introduce task delays and multitasking requirements that contribute to the complexity and workload of performing primary tasks. Scenarios that are unfamiliar or unusual The scenario is not one that operators encounter frequently or on which they train. Thus, even with procedures the scenario has high uncertainties and operators have to analyze many parameters, select among many possible mental models for the situation, and evaluate multiple outcomes. Scenarios that require knowledge based behavior Knowledge-based task demands occur during scenarios for which there are no detailed procedures or for which procedures are not having their intended effects. Operators must assess the situation and develop response plans as they manage the situation. Scenarios with distracting and interrupting demands Some scenarios may produce a high level of distractions and interruptions, which raises workload and disrupts performance. An example would be a second failure occurring while operators are addressing the first failure. Scenarios that are highly dynamic In dynamic scenarios, the frequent onset of new or changing information makes it difficult to assess plant conditions, plan appropriate responses, or execute complex tasks. In such scenarios, operators have to frequently update and revise their understanding of the situation and how they manage the event. Scenarios with time pressure Complex tasks that need to be completed within a limited period of time may require operators to make a trade-off between the thoroughness of performing tasks (e.g., continuing data monitoring to assure the assessment, evaluating alternatives, confirming the actions before moving to the next step) and completing tasks in time. Scenarios causing prolonged stress Scenarios that require operators to work long working hours on non-routine,