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:
for alarms, displays, controls, and computer-based procedures − Consider transients and accidents, such as: − transients (e.g., turbine trip, loss of off-site power, station blackout, loss of all feedwater, loss of service water, loss of power to selected buses or main control room (MCR) power supplies, and safety and relief valve transients) − accidents (e.g., main-steam-line break, positive reactivity addition, control rod insertion at power, anticipated transient without scram, and various-sized loss-of-coolant accidents) − reactor shutdown and cooldown using the remote shutdown system − reasonable, risk-significant, beyond-design-basis events that should be determined from the plant-specific probabilistic risk assessment (PRA) − external events (fires, floods, seismic events, and loss of large area of the plant) Additional Information: The most demanding staffing requirements that a shift faces is the first hour of a severe casualty, before the emergency response facilities can be staffed. Staffing and activating the operational support center (OSC), technical support 18.0-31 Draft Revision 3 – July 2015 center (TSC) and the emergency operations facility (EOF) reduce the burden on the shift. The OSC, TSC, and the EOF are typically required to be operational within thirty minutes to one hour of an emergency declaration. The emergency facility staffing would generally include extra senior reactor operators. Operating conditions selected need only be carried out far enough to address the period up to when added staffing is in place. The NRC-approved industry Flexible Coping (FLEX) strategies, written to meet the Japan Lessons Learned mitigation strategies order for beyond design basis external events, are based on minimum shift staffing for the first two phases. Staffing analyses are to evaluate minimum staffing, so typically these analyses should include Phase 1 and 2 events and actions in the selected scenarios. For the second or transition phase,