CLIC CES Meeting 14 jan 2009

A resume table for fire safety in LHC, and a possible scheme for other machine – part

1CERN –SC Fabio Corsanego

From past meeting of 12 Nov 2008 : 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

CERN-LHC-Underground

CERN LHC Surface Blds

… …

Reference codes no specific constr. codeCern can negotiate internally safety criteria and its application

swiss and french codes

Description from fire point of view

Depth =100m Length =27.5 km 6 large halls of 10 to 40000 m3

Industrial services halls, spread on the surface

Introductive notes

CERN-LHC-Underground CERN LHC Surface Blds … …

Occupants: Trained employees and collaborators(visitors w. restrictions)

Same, with basic training

Ability and resources of fire services

Internal professional fire brigade ( ~2 immediate teams + delayed on call)

Other hazards than heat and smoke in case of fire

Long ways, Energy stored in magnets, condensers cryo fluids, pressure buildup, flammable, inert gases, irradiation, contamination

Cryo and flammable fluids, condensers, contamination, irradiation, inert gases

Emergency plan Intervention Scaling up agreements via swiss and france firefighers

same

Fire load Low in standard tunnels, mild in power stations, large in experiments halls

Mild as average, locally high due to oils and flammable gases

Design Conditions

CERN-LHC-Underground CERN LHC Surface Blds

… …

Properties of combustible materials

Most cables and plastic are fire retardants low smoke- derogations

same

Protection against electric faults

Standard electric rules- ad hoc solution for physics equipment

Standard electric rules

Lightning protection

na yes

Worksite organization

Fire permits, work coordination, etc

same

Measures to prevent the insurgency of a fire

CERN-LHC-Underground CERN LHC Surface Blds … …

Escape strategy Occupants shall self rescue as rescue teams have long access time

Same

Type of stairways and access ways

Vertical paths (Stairs and lifts are smoke tight, fire resistant, free of combustibles and pressurized) horizontal paths are exposed to smoke and fire

Vertical paths are Smoke tight for multi floors buildings.Horizontal paths are exposed to smoke and fire

Travel distance to reach an exit

3 km for tunnels; few tens of meters for halls

30- 40 m to reach a different compartments with blind corridor <15m

Doors Sector doors are flat steel. Doors between experiment and caverns, and vertical ways are fire rated 2 hr

Fire doors are in most cases no more than 15 minutes

Access Control Locking

Yes. Forcible for evac w. interlock. In a few cases (CNGS) radioprotection inhibited usability of exits

Same

Escape in the event of a fire

CERN-LHC-Underground CERN LHC Surface Blds … …

Guidance signs for escape

Fluorescent panels every 30 m Fluorescent panels

Emergency lighting

emergency network. Tunnels have light every 30 m. Halls have lights spread as needed

same

Evacuation Alarm

Yes . Activated manually or remotely by control room

Communication devices

Phones. Secured point to point (red) phones.Mobile phone network.Radio FM repeaters for Fire brigadeExperiment may implement public address systems

Escape in the event of a fire (continued)

T.B. Continued with remaining chapters as described in last CES meeting.