Fire Modeling Background
Fire analysis is a key component of assessing risk in nuclear (and other) facilities. It is required as part of a Probabilistic Risk Assessment (fire PRA).
Fauske & Associates, LLC (FAI) performs detailed fire modeling of nuclear and industrial facilities using our own in-house software and widely used public domain tools. We have more than ten year’s experience in model development, validation, participation in international exercises and application to nuclear power stations and fuel cycle facilities. Because we have developed and benchmarked our own models, we understand the strong points and the limitations of public domain tools, so that we can correctly judge the applicability of results for individual scenarios and the impact of modeling uncertainties.
Fire modeling services include:
- Plant walk-down to identify vulnerabilities and scenarios
- Scoping fire modeling with simplified tools
- Detailed fire modeling with public domain tools: FDS, CFAST
- Detailed fire modeling with in-house tools: FATETM
- Circuit failure analysis and cable selection
- Integration of fire modeling and risk assessments
Logic for Selection of Fire Modeling Software
|Public domain CFD||FAI-developed & licensed Nuclear QA||Public domain "zone"|
|Most complex||"Medium sophistication"||Least complex|
|Best for complicated flow patterns and temperature profiles are anticipated||Best for multiple room situations, heavier –than-air gases and tracking radioactive & toxic aerosols||Good for quick modeling of one or two rooms|
|Improved target model available soon, not practical for multiple rooms||Target model similar to FDS, hybrid of zone with multi-dimensional targets||No aerosol capability|
From the U.S. perspective, fire PRA methodology is outlined in a key document created jointly by EPRI and NRC, EPRI-1011989, NUREG/CR-6850. Tasks 8 and 11 pertain to fire modeling and cover scoping and detailed modeling respectively.