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:
ed to support workload analyses. For example, one cannot determine the workload of a primary task like ‘Start Pump A,’ without breaking it down to more-detailed subtasks not typically described in procedures. The subtasks may include detailed actions such as: navigate to the feedwater display, locate the pump to be controlled, verify that the correct pump has been selected, assess that the preconditions for starting the pump are acceptable, click on the pump icon to access the pump controls, select “on” and click “Enter,” and finally verify that the pump has been turned on and is operating properly. These subtasks are the detailed means by which the higher-level plant control task is accomplished. b. The applicants should include an analysis of the operator tasks associated with new design features, even when the tasks are mainly cognitive activities such as monitoring. Additional Information: For example, in a highly automated plant, operators will spend considerable time and effort monitoring the automation and assessing its 18.0-34 Draft Revision 3 – July 2015 performance. Cognitive task analysis techniques may to useful for analyzing such cognitive tasks. In summary, the analysis of the operators’ primary tasks may require a combination of procedures, procedure guidelines, and task analyses to identify all of the detailed tasks and activities that operators will need to perform during the challenging operating conditions. 3. Identify Dependent Tasks a. For each of the challenging operating conditions, the applicant should identify the dependent tasks, which operators need to perform in support of the primary tasks. Additional Information: Dependent tasks are those not specifically part of the procedure-driven primary tasks, but which operators still have to perform in the same time frame. When such tasks are performed in the same time period as the primary tasks, they contribute to crew’s workload, may introduce distractions or interruptions,