HiRadMat hearing session: safety file
HiRadMat Hearing sessionCERN, July 27, 2011
Outline Safety file
Descriptive part Hazard inventory Demonstrative part Operational part Feedbacks
Other recommendations from safety review
S. Evrard – EN/MEFEDMS No: 1155047
Demonstrative part2
Id Hazards Risks Organisational measures
Technical measures Personal measures
1. TNC is a high radiation area.
Contaminated dust in TNC (from destructive work in TNC radioactive area)
External exposureInternal exposureEnvironment exposure
- SPS access procedure in controlled area (EDMS 1138833)-Safety code F - Radiation Safety Manual- RP supervision-A6 - The two-person rule of working-ALARA principles
- Access system and RP veto for PPG6907 door.- Hand foot monitor control in BA7.-Ventilation system.- Alara oriented design of the facility.- Ramses system
- Individual protective equipment IPE (safety shoes, auto-saving mask, helmet) - Individual and operational dosimeters- Overshoes- Depending on the nature of the work :-gloves if object handling in TNC-overall clothes + individual breathing mask if "destructive" work
2. Moving crane and moving PPG6907 door
Collision with people or equipment
Door opening procedure on crane control panel
Switch : if door closed, crane will stay offManual door opening
IPE
3. Moving crane and lifting loads
Collision with people or equipment
-Overhead crane handling procedure (EDMS 1145906)- Handling by qualified overhead crane drivers- Safety Regulation on mechanical equipment (SR-M)
Slow motion handling and safety perimeter
IPE
Demonstrative part3
Id Hazards Risks Organisational measures Technical measures Personal
measures4. Moving crane
and lifting loads in radioactive area
Collision with people or equipment External exposureInternal exposure
See point 1. and 3. See points 1. and 3.Handling of crane remotely
See point 1. and 3.
5. Electrical installation and equipments
FireElectrocution
Safety inspections - installation acceptance + periodic inspectionsElectrical equipment under norms : C1 - Electrical safety code + IS23 and IS41
Fire detectionExtinguishing means(see EDMS 1146217)
IPE + see point 1.
6. Material (hooks or tools) used in TNC, exposed to contaminated dust
Internal exposure Dedicated RP training (EDMS 1079566)
Radiological control from RP technician
See point 1.
7. Activated shielding when patrolling TNC
External exposure HiRadMat patrol procedure EDMS 1152694See Point 1.
See point 1.
8. Working at heights when patrol PEE7
Fall HiRadMat patrol procedure EDMS 1152695
Red phones availableModifications improving safety in B.846 (EDMS 1154768)
See point 1.
Demonstrative part4
Id Hazards Risks Organisational measures
Technical measures
Personal measures
9. Work near radioactive dump
External exposure See point 1.Collimator and TED exchange procedureGaz and vacuum pump connection procedureGaz and vacuum pump disconnection procedure
Collimator and TED have been design to minimize dose exposure to personnel
See point 1.
10. Radioactive water from dump cooling circuit
Environment pollutionInternal exposure
Collimator and TED exchange procedure
Circuit filling alarm monitoring system availableRamses system
IPE + see point 1.
11. Radioactive condensate water from air dehumidification in TNC
Environment pollutionInternal exposure
Condensate water evacuation procedure
Full tank alarm monitoring system availableRamses system
IPE + see point 1.
12. Lifting heavy hooks (13kg)
Collision with people or equipment
Overhead crane handling procedure (EDMS 1145906)- Handling by qualified overhead crane drivers
Safety perimeter IPE
13. Contaminated air filter and bags in ventilation system
Internal exposure Replacement of polluted absolute filters procedure (EDMS 1154808)Handling by 2 qualified operators (EN/CV) in contaminated filters exchange
Safety perimeter IPETaped glovesCombinaison and protection mask P3
Demonstrative part5
Id Hazards Risks Organisational measures Technical measures Personal
measures14. Moving material
lift in PA7Collision with people or equipment
Use of material lift by qualified personnel from transport EN/HE or subcontractor
Material lift under veto RP IPE
15. TT66 beam line - Electromagnetic fields
Collision with equipment
IS 36 – safety rule for the use of static magnetic fields at CERN (EDMS 335801)
Access forbidden by access interlock (EDMS 1146079 + 1146094)
16. TT66 beam line - Vacuum
Internal exposure Mechanical analysis (EDMS 1108983)
Beam size measurement by BTV + additional C-C plate (see section 4)
S. Evrard – Hearing session 2011, July 27
Main risks assessed: Radiation Beam Vacuum Fire Environment Decommissioning
Risk Management Example6 Stray radiation (external exposure)
Design stage: Fluka simulations CV and Ramses design Dedicated handling means (lifting jig and eyes) Prefabricated structure (easily removable) Activated material management plan Maintenance plan (reduced time in TNC)
Organizational measures Frequent radiation survey of TNC tunnel Dedicated RP training ALARA, JOLI & DIMR preparation with all stakeholders On-site close RP monitoring
Technical measures Access , ventilation and RP sectorization Ventilation system Ramses monitoring system Remote controlled PR532 crane
Personal measures IPE, dosimeters, … S. Evrard – Hearing session 2011, July 27
Airborne contamination decrease
Equipment remote handlingAbsolute Filter exchange
Operation part7
This part of the HiRadMat Safety File is an inventory of all operational documents needed in order to optimize the exploitation of the project HiRadMat especially in terms of safety.
These operational documents are of three kinds: Information note Operational instructions and procedures Control and test reports
S. Evrard – Hearing session 2011, July 27
Operation part8
Question Procedure EDMSHow to get access authorized to the HiRadMat facility ?
Preparatory steps to take before accessing to HiRadMat
1154948
How to get access to HiRadMat Access procedure 1155061How to escape from the facility ? Escape procedure 1153056How to patrol the facility ? Patrol procedure 1152694How to deal with activated material ?
Activated material management procedure
1146265
How to handle alarms from HRM ? Alarm management procedure 1152693How to maintain the facility ? Maintenance plan 1154793How to deal with incidents ? Faulty situation and incident
analysis1154637
How to manage fire risk ? Fire prevention and fire risk management
1146217
S. Evrard – Hearing session 2011, July 27
Feedback part9
This part of the HiRadMat Safety File is an inventory of all feedbacks, mishap reports as well as experience gained reports which are very important to take into account in order to optimize the exploitation of the HiRadMat facility especially in terms of safety.
Document EDMS #REX T9 modification 1146086Comments on May 2011 TS (safety coordination) 1146084
Incident Sectorization gate PPG 6907 1154672
S. Evrard – Hearing session 2011, July 27
EDMS approval process status10
Document EDMS Status DeadlineSafety file – descriptive part 1145711 Under Approval 20/07Safety file – Hazard inventory 1145836 Draft for discussion 02/08Safety file – demonstrative part 1145719 Engineering Check 03/08Preparatory steps to take before accessing to HiRadMat
1154948 In Work
Personnel access to HiRadMat 1155061 In WorkEscape procedure 1153056 Under Approval 20/07Patrol procedure 1152694 Under Approval 20/07Activated material management procedure 1146265 Under Approval 26/07Alarm management procedure 1152693 Under Approval 20/07Maintenance plan 1154793 In WorkFaulty situation and incident analysis 1154637 Under Approval 25/07Fire prevention and fire risk management 1146217 Under Approval 30/07
S. Evrard – Hearing session 2011, July 27
Other recommendations from safety review
S. Evrard – Hearing session 2011, July 27
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RISK ASSESSMENT CABLES = THE MAIN HAZARD PREVENTION MEASURES IN PLACE (FIRE DETECTION, EXTINGUISHING MEANS, AIR
TIGHTENING CAMPAIGN) FIRE IN THE HIRADMAT FACILITY – OPERATION MODE
Operation mode means that the situation is under control: all the doors are closed in the facility and nobody is present underground, i.e. no human life in stake.
FIRE IN THE HIRADMAT FACILITY – SHUTDOWN MODE Shutdown mode means that the situation is not under control: all the doors could
be or are open in the facility and people are present underground, i.e. human lives are at stake.
FIRE IN THE SPS A fire in the SPS could than affect the HiRadMat facility. Therefore it is proposed to
equip the door PPG 6905 (separating TCC6 and TJ7) with lock springs in order to ensure that the door is closed at all times and thus prevents smoke to enter into the HiRadMat facility area.
COLD SMOKE EXTRACTION
Risk and incidents with fire
Other recommendations from safety review
S. Evrard – Hearing session 2011, July 27
12
Two escape ways are considered depending on where the event causing the evacuation is triggered. The recommended way is passing through TJ7, then TA7, PA7 and return to the surface via the BA7 access point via the staircases. If someone is blocked in TNC and cannot escape using this recommended way, an alternative way is in place via the B.846 shaft.
Escape ways to be defined
Other recommendations from safety review
S. Evrard – Hearing session 2011, July 27
13 B.846 shaft safety assessment as escape way
End of HIRADMAT experiment- AUG (clear visible next to the escape door)- Red telephone (clear visible next to the escape door)
Halfway ladder escape pit-Anker points (2 points, one of 35 kN above the shaft and one of 10 kN above the ladder)- Possibility to remove fence- Possibility to close the hole to stairs
Bottom escape pit-Red telephone at the bottom of the pit (separated from HIRADMAT experiment), with direct contact to fire brigade - Entrance door, which can be opened in emergency without key.- (to discuss) Sign that explains that before the use of this shaft the FB must be informed and contact with FB is mandatory once the top has been reached. If desired FB can secure ascension.
Top escape pit-The yellow balk under the plafond can be used as anker point, if it can bear a load of 35 kN. (if this is not the case, 2 points should be constructed as the point halfway the pit.-Red telephone with direct contact to fire brigade (in function)-Door to exit, which can’t be locked by keys
2 visits on-site with FB FB safety assessment Modifications in
progress (deadline = september)
Other recommendations from safety review
S. Evrard – Hearing session 2011, July 27
14
SPS sector 6&7 Seal on PPG710 B.846 shaft patrolled
only if seal broken or patrol box dropped
Search procedure
Other recommendations from safety review
S. Evrard – Hearing session 2011, July 27
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The various incidents and faulty situations that can occur in operating the HiRadMat facility have been identified and are listed here below: Vacuum window failure Beam loss incident Ventilation failure PR532 crane failure Contamination spread around the test bed
Abnormal conditions and accident scenarios
Other recommendations from safety review
S. Evrard – Hearing session 2011, July 27
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Access to BA7/TA7, TJ7, TCC6 tunnels 17 steps or actions identified involving user, CCC
operator, RP technician before access is granted Access to BA7/material shaft
idem Access to BA7/TNC tunnels
Idem + work notification and DIMR Checklist for End of Access in HiRadMat
Define access conditions
Outcome
S. Evrard – Hearing session 2011, July 27
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Thanks to the fruitful collaboration of many of you, a complete set of safety documents is ready for approval
It is not only safety documentation but some hardware modifications were implemented and communication among safety stakeholders is improved (CCC operators, Fire Brigade,…)
Ways of improvement: Information is somehow fragmented one single user
document needed Demonstrative part to be more specific
Safety file will evolve in the course of the facility operation
Safety file
