CLIC CES Webex 12 Nov. 2008

• Summary:– Set of fire safety measures defined in CERN Safety

Report– Proposed Structure for CLIC/ILC Fire Safety Report

Fabio CorsanegoFire Safety CERN-SC

Structure of the safety report

The Safety Report is subdivided in several parts..• Description of the hazards (non mitigated yet)• Measures to mitigate the hazard:– Prevention• A Design • B Organization

– Protection • C Design • D Organization

“Low fire load” in the tunnels

Fire radiologic risk localized in few specific

points (collimators, experiments)

Basic Assumptions

A) Prevention-design (1)

2 m/s

• Subdivision into ventilation sectors

• Possibility to increase ventilation flow in the tunnel ( to 2 m/s)

A) Prevention –Design (2)

• Pressurized access shafts P>0Fire Rated 2 hrs

A) Prevention-design (3)

• All zones with “periodic access” have multiple way out

• Evacuation system• Automatic Fire

detection in areas with relevant fire load

A) Prevention- design (4)

• Electric Vehicles for Fire Brigade

• Areas with large fire loads have internal hydrants

• Warm magnets are interlocked with thermal detection

B) Prevention-organization (1)

• Temporary storage of combustibles forbidden

• Regular maintenance of the automatic detection system

• Fire Brigade has materials and resources adapted to the hazards..

• Hot work permits• No smoking facility

C) Protection -design

• Fire retardant no halogen cables and plastics

• Emergency call points every 60m with evacuation buttons and phones

• Emergency light and signs• Foam system in the

cavern

D) Protection - Organization• Fire brigade has

intervention procedures including smoke extraction

• Manual fire fight means (extinguishers, hydrants, are

localized where there is large fire load)

• Training for workers• Self rescue breathing

devices

Resume’• The combustible amount is low, exception made for about 90 locations.• A large fraction of this combustibles burn with difficulty• The fire risk has been judged moderate• Experiments have foam deluge systems

Residual risk:• If a fire happens underground people will have to reach an exit located,

at worst, at 2.5 km distance• Breathing device to assist for 30 minutes in the smoke• Potentially a relevant fire damage to equipment• In case of fire, fire brigade will try to reach the spot (can take 60*

minutes) an initiate fire fight with manual extinguishers or, in few locations, with hydrants

• The ventilation can be increased to help to reach the spot

•T=0: fire and smoke starts travelling in tunnel•t-=~ 20 min: smoke is detected; Fire Brig. Alerted•T=~25 min: the machine stopped; Fire truck on the way•T=~35 mins: Smoke could reach outside if not filtered•T=~40 mins Fire truck on surface•T=~50 mins Fire twin underground (if RP ok)•T=~65 mins Fire Twins reaches the fire (if air is still sufficient)•T=~70 fire twins air is maybe over and have to be changed•And so on

Proposed strategy for ILC-CLIC

• No reference codes yet, but we should have at least 2 objectives:

• Protect life= reach a safe area leading outside in less that 2-3 minutes

• Protect property= damage contained to less that ?x (value should be indicated here)? in case of accident

Proposed Structure for Fire Safety Report

INTRODUCTIVE NOTES• Reference Codes for Fire Prevention• Description of the facility from the fire Safety Point of View

DESIGN CONDITIONS:• Characteristics of the Occupants• Ability and Resources of the Fire Service• Special Hazards in case of Fire, and Emergency Plan• Fire Load

MEASURES TO PREVENT THE INSURGENCY OF A FIRE• Properties of the Combustible Materials• Protection against Electric Faults• Lightning Protection• Worksite Organization (fire permits etc, work coordination)

ESCAPE IN THE EVENT OF A FIRE• Escape Strategy• Type of Stairways and Access Ways• Internal evacuation pathways• Travel Distance to Reach an Exit• Doors• Access Control Locking• Guidance Signs for escape• Emergency Lighting• Evacuation Alarm• Communication Devices

PROTECTION AGAINST THE SPREAD OF FIRE BETWEEN COMPARTMENTS• Subdivision into Fire Compartments• Fire Resistance Class of Structural and Non-structural Elements Separating the Fire

Compartments:• Technical rooms on surface

FACILITIES FOR FIREFIGHT:• Access routes for the rescue service:• Fire gas ventilation;• Equipment for Manual Fire Fighting:• Communication Systems;

HEATING, VENTILATION AND AIR CONDITIONING (HVAC), and SMOKE EXTRACTION• General aspects common to the whole facility• Commands (stop and activation) for the ventilation and smoke extraction system• Fire protection construction of plant rooms and shafts• Protected Access Shaft• TUNNEL and Transfer line VENTILATION• Exepriment Hall Ventilation and Smoke Extraction

FIRE PROTECTION INSTALLATIONS• Automatic fire detection• Evacuation alarm system• Automatic Fire suppression Systems