Beam Imminent Warning - PowerPoint Presentation

Presentation on theme: "Beam Imminent Warning"— Presentation transcript

Slide1

Beam Imminent Warning 11th of March 2013

Prepared by:

Christelle

Gaignant

, Michel

Decombaz

, Fernando B. S. PedrosaSlide2

Observations (1/2):

On the 11

th

of March at 14:14 the UX25 and adjacent LHC sectors sirens were triggered for a Beam Imminent Warning;

All people present inside UX25 and US25 access points evacuated correctly with the exception of 2 people on the US25 side;

All people that evacuated went correctly to the SY2 (assembly point);

None of the people present underground at the moment of the evacuation pressed an AUG button or opened a end of zone door;

Neither

the Fire Brigade

nor

the CERN or Experimental control

rooms

had any alarm on the alarm screens;Slide3

Observations (2/2):

There was no warning at the top of the lift to avoid people to go down;

The safety veto on the PX24 and PM25 access points was triggered;

The Fire Brigade was called by the ALICE GLIMOS;

The safety veto was removed before the Fire Brigade had the possibility to go to the PADs and check the people underground;Slide4

Feedback collected after the incident:

Fire Brigade intervention report;

Logbook entry by the CCC operator;

Deviation report;

Feedback from people present at the moment of the BIW underground.Slide5

Lessons learned:

It

is extremely

difficult to understand a Beam Imminent Warning alarm with the little information available during a

stop in the control rooms;

People don’t know how to react to a Beam Imminent Warning alarm;

Not all the people evacuate even if the sirens are quite strong;

The people that evacuate go correctly to the assembly point;

The removal of the safety veto shall be coordinated with the people on the field following an alarm;Slide6

Points under discussion:

Implement

the EIS quality assurance process (managed by BE);

Understand better the BIW evacuation matrix, the interface with the access system and identify improvements if they are needed (ex.: top of the lift sign, …);

Clarify who takes the decision to remove the safety veto and based on which conditions;

Analyze with more detail what happened on the different systems and which were the procedures applied

;

Implement in the new ALICE safety training the BIW part and discuss possible improvements on a general level;