March 8, 2006 Exp. Area Meeting - E. Thomas 1

Oxygen Deficiency Hazards Detection System in UX85

Two risks – Two systems

1. Top : He leaks2. Bottom : CF4 leaks (~100 m3 in RICH2)

March 8, 2006 Exp. Area Meeting - E. Thomas 2

Specs & configuration

The design parameters should be compliant to the existing ODH system implemented in the tunnel.

ConfigurationHe •3 02 sensors at the top of the cavern•6 flash lights + 6 signs indication the meaning of the alarm.

CF4•2 O2 sensors on the ground of the bunker (close to entrance)•2 Flash Lights + 2 signs, one at each entrance of the bunker.

Behavior (as in the tunnel)•1 02 sensor below threshold: Flash light activated + alert to fire brigade •2 O2 sensors below threshold: evacuation alarm triggered.

March 8, 2006 Exp. Area Meeting - E. Thomas 3

O2 Sensor and Flash Lights Locations

O2 sensors

O2 sensors

Flash Lights

Flash Lights

Note: positions are indicative only. They were defined following a cavern tour byDavid H., Gunnar L., Daniel L., E.T and discussions with Rolf L.

March 8, 2006 Exp. Area Meeting - E. Thomas 4

O2 Sensor and Flash Lights Locations

March 8, 2006 Exp. Area Meeting - E. Thomas 5

O2 Sensor and Flash Lights Locations

March 8, 2006 Exp. Area Meeting - E. Thomas 6

Cost, Who & ScheduleCostCF4 (Bunker) 4246,02 euro + cables (~ 1k euro)He (Cavern ceiling) 10622,67 euro + cables (~ 1k euro)

Who• Installation-subcontractor: Amec-Spie supervised by David Hay (include tests, connection to the existing system in the tunnel).• Reception tests, commissioning : Gunnar Lindell• Maintenance (subcontractor) David Hay

ScheduleCompleted by 1st week of April 2006 ( if we start now…)