GLASS commercial nuclear

FRS – commercial nuclear

Emergency response

Emergency response for nuclear facilities involves a multi-organizational response from groups that include emergency planning, engineering, operations, maintenance, rad protection, and security. Plant personnel are trained on a diverse set of accident scenarios via simulated drills. Facility Response Simulation provides customized modules to assist personnel with the ability to quickly visualize and understand current operating status, equipment unavailability, and/or failures.  This allows for timelier implementation of focused mitigation strategies to resolve the incident. Available FRS modules include:

  • RAD
  • Emergency Action Levels (EAL)
  • FLEX
  • Safe Shutdown
  • Probabilistic Risk Assessment (PRA)


During an emergency plan drill/exercise which results in the postulated release of radioactive materials, RAD calculations can be integrated into FRS to provide radiation dose rates in specific locations either internal or external to the facility as a function of time. Onsite radiation dose rates can be displayed in electronic room drawings. Offsite dose rates can also be displayed on electronic site or emergency planning zone (EPZ) drawings.

Emergency Action Levels (EAL): Emergency response to accident scenarios requires timely classification of the event to offsite agencies. FRS equipment and system status provides a direct input to assist in the evaluation and classification of the event according to the emergency action level that is met.


FLEX graphically depicts additional equipment and connections that can be aligned to existing systems to address beyond design basis scenarios (i.e. Fukushima). FLEX equipment is integrated into FRS including FLEX equipment storage locations, routings of portable hoses, and connections to existing plant electrical and piping. Under abnormal plant conditions where complex failures result in system losses beyond design, FRS provides an understanding of which FLEX options are available to mitigate an accident scenario. Use FRS-FLEX to model an existing FLEX strategy to better understand potential limitations or use FRS-FLEX to understand where additional FLEX connections may benefit a facility across multiple scenarios.

Scenario selection.
Scenarios can be chosen either individually or concurrently from a convenient scenario selection screen that is built from plant design data. Examples of design data include: equipment locations, cable routings, seismic ratings, flooding levels or room elevations, established fire area or fire compartment documentation.

Engineering personnel at nuclear facilities have found FRS to be useful because it retains logic and allows for a visual understanding of plant status and potential pinch points. Modules are built once and can be used daily by personnel from different departments.

PFP - nuclear facility

Facility response

Depicts system and equipment status in user-familiar formats.

FRS brochure

FRS brochure

Download the Facility Response Simulation (FRS) brochure.

Customizable FRS

Customizable FRS

Symbols and layouts can be customized to meet user preferences.



Provides real-time evaluation into potential radiation exposures.



Mitigation strategies for beyond-design-basis external events.


Emergency Action Levels (EAL)

Defines a threshold to place the plant in an emergency classification level.

Safe Shutdown

Safe Shutdown

Develop and document safe shutdown fire area strategies.