Beam Imminent Warning - PowerPoint Presentation

Beam Imminent Warning
Beam Imminent Warning

Embed / Share - Beam Imminent Warning

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


Beam Imminent Warning 11th of March 2013

Prepared by:



, Michel


, Fernando B. S. PedrosaSlide2

Observations (1/2):

On the 11


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;


the Fire Brigade


the CERN or Experimental control


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:


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:


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;

By: aaron
Views: 81
Type: Public

Download Section

Download Presentation - The PPT/PDF document "Beam Imminent Warning" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.

View more...

If you wait a while, download link will show on top.Please download the presentation after loading the download link.

Beam Imminent Warning - Description

11 th of March 2013 Prepared by Christelle Gaignant Michel Decombaz Fernando B S Pedrosa Observations 12 On the 11 th of March at 1414 the UX25 and adjacent LHC sectors sirens were triggered for a Beam Imminent Warning ID: 544836 Download Presentation

Related Documents