Jean-Philippe Tock (TE-MSC) On behalf of the SMACC project … Courtesy ….
Thomas Otto, TE Safety Officer€¦ · SMACC and the LHC as a pressure vessel • LHC is an...
Transcript of Thomas Otto, TE Safety Officer€¦ · SMACC and the LHC as a pressure vessel • LHC is an...
Thomas Otto, TE Safety Officer
Cristina Adorisio, DGS-RP (Radiation Protection Aspects)
3rd Splice Review, 12. – 14. 11. 2012
Contents
I. SMACC and the LHC as a pressure vessel
II. Health and Safety during SMACC work
I. SUVA Method for Risk Assessment
II. CERN Operational Procedures
III. High risk operations and controls
IV. Radiation protection aspects
III. Safety Training for LS1 and SMACC
SMACC and the LHC as a
pressure vessel • LHC is an existing equipment
• Harmonized standard (EN ISO 13458) not
available at time of construction
• Components subject to pressure were
designed to standards CODAP and CODETI
• SMACC is a repair, not a modification
• Therefore, all pressure-vessel related quality
and safety criteria follow the “old” standards
Health & Safety during SMACC work
• Based on a Hazard Register and a Risk
Assessment
, no consequences
Hazard +
(exposure*consequence)
= Risk
SUVA Method for Risk Assessment
• SUVA – Swiss professional accident
insurance and prevention organism
• Start with systematic classification of
Workplace hazards N. Hazardous Phenomenon Exemples
1 Mechanical
Hazards a Unprotected moving elements Zones d’écrasement, de cisaillement, de choc, de coupure, de
perforation, d’entraînement, de happement b Dangerous surfaces and edges Coins, angles, pointes, arrêts vives, rugosités
c Moving vehicles and machines Accrochage, heurt, basculement, écrasement, chute, rampes,
déclivité
d Uncontrolled moving elements Basculement, balancement, roulement, glissement ou
projection d’éléments e Fall of objects
f Fluids under pressure Gas, vapour, oil,
2 Trip, Slip and
Fall hazards a Working at height Ladders, platforms, ramps
b Level differences Steps, opening in floor
c Slippery surfaces Snow, ice, soiled or wet floors
d Disorder
e Visibility Fog, smoke, dust
And so on [….]
Risk Scale
• Very simple approach, gauged to the project:
• Low risk: worker suffers minor injury, without
consequence for himself and for the project
• Medium risk: worker suffers minor injury,
without consequence for himself, but project
progress may be delayed as a consequence of
the accident
• High risk: Worker may suffer permanent
incapacity as a consequence of an accident
CERN Operational Procedures
• Detailed work instructions for all project
phases
• Made for the end-user (worker)
• Main source of safety-relevant information
Chap. Avtivité Sub-activity EDMS Ver. Baseline 1.1 Ouverture manchette
W Démontage Manchette W 1236329 0.1 LHC-QBBI-IP-0017
1.2 Installation des soupapes de décharge DN200 1236232 0.2 LHV-QBBI-IP-0016 2 Contrôle qualité écrans thermiques 3.1 Ouverture manchette
M Installation des protections
3.2 Découpe soudure manchettes M 1227123 1.1 4.1 Dépose Isolation
busbar Capture soufflet M 1198420 5 LHC-QBBI-IP-0014-00-70
4.2 Dépose isolation interconnexion 1198424 5 LHC-QBBI-IP-0011-00-40 5
Contrôle qualité
brasure
Quality Control of the LHC Main Interconnection
Splices produced before LS1 (before Application of
Shunts)
1240298 0.1 LHC-QBBI-TP-0006 v.0.1
And so on […]
Risk assessment method
• Identify the hazards inherent in the
operational procedures, according to SUVA
systematics
• Estimate the risk (L/ M/ H) without controls
• Describe the controls already in place
• Are controls appropriate and sufficient ?
• If not, recommend additional controls
Specific High-Risk Operations
Risk Operation Control
Mechanical Risks
Cutting, shear, abrasion,
entanglement
Work with machine tools
CE-cert. tools, personal
protective equipment (PPE)
Projection of liquids Hydraulic tools Systematic inspection of
tools
Moving machines Brazing and soldering
machines
Arrest manual brakes
Hazardous substances
Flux vapours Brazing, soldering Local exhaust ventilation
(LEV), PPE
Metal vapours (Pb, Sn) Brazing, soldering low T << 500oC, LEV,
workplace monitoring :
negative result
Specific High-Risk Operations (cont.)
Risk Operation Control
Physical Constraints
Noise Mechanical tooling
operations, compressors,
PPE
UV light TIG welding Welder’s mask and clothes
Magnetic field Induction brazing machine Off-limits for pace-maker
and defibrillator bearers
Lighting Visual quality control Portable projectors
Muscular-skeletal disorders
Handling of heavy loads Pumps, machine tools,
bellows …
Correct posture, team
work, mechanical aids
High Risk operations common to
all SMACC phases Risk Control
Hazardous substances
Alcohol for cleaning: toxic and
flammable
PPE, Tunnel ventilation,
reduction of quantity
Multi-layer insulation fire Extinguishers present during hot work
Work Organization
Unfamiliarity with workplace Team building,
several weeks run-up period
Language barrier Basic French lessons, Phrasebook,
Identification of interpreters
Repetitive work,
lack of decision margin
Vary tasks, change roles, small teams
Lack of qualification Thorough on-the-job training
Road Transport Safety Information campaign (flyer)
Radiation Protection Aspects
• The LHC Arcs show
marginal radiation
hazard:
• Ambient dose
equivalent rate
H*(10) < 0.5 mSv h-1
• Radioactivity nearly
always < exemption
limit
Radiation Protection Aspects (2)
• Nevertheless, RP controls imposed:
• LHC classified as radiation area
• RP safety briefing
• Personal dosimeter
• All waste treated as potentially radioactive
• Sealed vacuum cleaners, emptied by RP in
glove box
• RP support staff at each access pit during both
SMACC shifts
Radiological classification of areas – 2013
Point 1 Point 8 Point 7
Point 6
Point 5 Point 4
Point 3
Point 2
For the LS1
LHC tunnel mostly classified as Supervised
Radiation Area
Few areas might be classified as Simple Controlled
Radiation Area
Collimation and dump areas will be classified as
Limited Stay Area
Formal Safety Training for LS1
and SMACC
Training Comment Form
Initial Safety Briefing With the TE DSO Trainer
CERN Safety Level 1 Basic site safety Web
LS1 Safety Condensed from CERN Safety level 2-4 Web
Electrical Safety
Awareness
For non-electricians Web
Electrical qualification French “Habilitation” for electricians Trainer
RP Safety Briefing Web
Self-Rescue Mask With practical exercises Trainer
The following table is simplified for staff and associated members of personnel. Contractor’s safety training is largely the employer’s responsibility.
Role of the Supervisors
• In the CERN hierarchy, the responsibility of
the supervisor includes safety aspects
• Supervisors shall be
• Informed of hazards, risks and controls
• Verify the application of procedures
• Correct hazardous behaviour, if necessary
• Report dangerous situations
• Go ahead as a good example of safe behaviour
Summary
• High-Risk operations in SMACC have been
identified and controls found appropriate
• Additional controls for common risks are in
preparation
• Radiation protection aspects are fully
covered
• Safety Training is essential
• formal and on-the-job
• Full implication of Supervisors is important