# ESS fire- and explosion safety programme - deterministic and probabilistic conditions – case study on acceptance criteria to open smoke hatches in the instrument building.

- Institution: CERN
- Department: HSE Workshop
- Speaker: Fredrik Jörud
- Year: 2018
- Language: English
- Subjects: Engineering
- Source: [CERN](https://videos.cern.ch/record/3016927)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

A number of Swedish acts and ordinances give the basic requirements of facility safety. None of these are tailored for ESS, hence interpretation is required for appropriate application. The Licensee shall as far as reasonable possible, based on existing technical experience and economical and social circumstances, undertake measures to limit 1) production of radioactive waste, 2) release of radioactive substances and 3) exposure to environment from ionizing radiation, ref. Radiation Protection Act (2018:396). Applicable legislative conditions go in to the design. As an example of that is the planning- and building act which requires implementation of: e.g. fire rated partitioning, emergency lights and fire alarm. The defence-in-depth approach (DID) is derived from the radiation protection act by the ESS-0001051 "Protection against fire and explosion". The DID is an important factor of justification to keep fire and explosion at the predicted frequency and consequence. The DID for fire safety sets the deterministic foundation by; 1) preventing the start of fire by housekeeping, to apply proven electrical installation standards etc. 2) quickly detecting and extinguishing the design fires 3) preventing spread of any fire that has not been extinguished. The DID for explosion safety sets the deterministic foundation by 1) preventing explosions by minimizing formation of explosive atmospheres 2) minimizing the risk of an explosion if an explosive atmosphere cannot be avoided 3) implementing design provisions necessary to limit the consequences of an explosion. The Swedish Radiation Safety Authority has released "Special conditions for the ESS facility in Lund", ESS-0018828. The special conditions set numeric acceptance criteria for potential risk of radiation exposure to public: - For the following event classes the reference values, shall apply as a maximum limit for radiological ambient consequences for the facility. Event class: Anticipated events (H2) – 0,1 mSV,…

## Lectures

1. [ESS fire- and explosion safety programme - deterministic and probabilistic conditions – case study on acceptance criteria to open smoke hatches in the instrument building.](https://invisiblenetwork.ai/learn/cern/3016927/f5c5ddc25cb9), 18 min (CERN's player)