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:
within prescribed time frame was considered “unfit for duty.” Another example of a common independent task is communicating with plant staff on matters unrelated to the primary task. 18.0-36 Draft Revision 3 – July 2015 Generally it is assumed that independent actions will be stopped when any plant transient occurs. However, operating experience shows there have been cases where confusion arises. Such conflicts should be addressed in plant administrative procedures to guide operators in how to manage independent tasks when they may impact operational primary tasks. Without such specific guidance, operators will make decisions on an ad hoc basis. Like dependent tasks, we can divide independent tasks into generic and plant-specific tasks. Further, the independent generic tasks can be categorized as: administrative tasks, communications, and system/equipment-related. Table 2 provides independent tasks in each of these categories. Note that some of these activities that can be either a primary, dependent, or independent task (e. g., technical specifications related activities). Table 2: Generic Independent Tasks Applicants should also systematically analyze the plant design and the use of new technologies and new ConOps to identify if there are any plant-specific independent tasks that should be included. The following are examples of the types of activities to consider for identifying plant-specific independent tasks: • Work-related handling of conditions of one unit that impact other units Type of Independent Task Example Activities Administrative Technical specifications activities Apply error-prevention tools, such as independent verification of valve repositioning, unrelated to primary tasks Log keeping Drill participation Corrective action generation and processing Drug testing Outage schedule reviews Scheduling of operations, maintenance, and testing Training Communications Manage standard communications Communicate with auxiliary operators or fire