Dumping System in Point 5 16032017 Miriam Blumenschein Expert group A Apollonio E Carlier J Uythoven P Van Trappen 1 Overview guideline Reliability targets in functional specifications ID: 781000
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Slide1
Reliability Targets for the SPS Beam Dumping System in Point 5
16.03.2017Miriam BlumenscheinExpert group:A. Apollonio, E. Carlier, J. Uythoven, P. Van Trappen
1
Slide2Overview guideline “Reliability targets in functional specifications” 2
1
2
What are the failure modes and consequences?
What is the maximum acceptable frequency?
Create a
Structure tree
of the system and
the hierarchically higher
system
Draw a
Block
diagram
containing the system, the system
boundary and input and output
variablesDefine the functions of the structure tree’s elementsDetermine all potential failure modes of the structure tree’s elements Create a causal link of failure odes and their consequences
Adapt a risk matrix to the use case if no risk matrix is applicable by defining:A criterion or criteria which describe the consequencesReasonable categories of consequencesReasonable categories of frequenciesDefine the areas of acceptable and unacceptable riskPlace the consequences in the acceptable area in the appropriate columnRead out the maximum acceptable frequency
Higher systemF1: Function 1 C 1: Consequence 1 C 2: Consequence 2 C 3: Consequence 3SystemF1: Function 1 FM1: Failure mode 1 FM2: Failure mode 2
Consequences
Catastrophic
Major
Moderate
LowNegligibleVery frequentFrequent ProbableOccasionalRemoteImprobableNot credible
Frequency
Downtime
3 month
3 weeks3 days3 hours3 mins
1/hour1/day1/week1/month1/year1/10years1/100years
C2
C1
C3
1
Slide3Principle SPS beam dumping system
3
LHC Injectors upgrade
SBDS relocation from LSS1+ to LSS5
Reconfiguration of the vertical kicker
function: beam dilution
remains the same
Schematic drawing of the SBDS
function: beam extraction
reconfiguration
Slide4Conceivable SBDS failure modes and effectsSuper Proton Synchrotron SPS F1: Provide particle beam for experiments and LHC safely
C1: Damage of the accelerator equipment C2: Damaged dump block C3: Increase in radiation of extraction equipment C4: Reduced availability
SPS beam dumping system SBDS
F1: Extract beam and lead it onto absorber block without losses
FM1: Missed beam dump
FM2: Beam on absorber block but not nominal extraction
FM3: Beam on absorber block but not nominal dilution FM3: Asynchronous (towards abort gap) beam dump with LHC beam
FM4: False beam dump 4
Slide5Risk Matrix for the SPSConsequences and acceptable area for the SBDS5
Consequences
Catastrophic
Major
Moderate
Low
Negligible
Downtime
3 month
3 weeks
3 days
3 hours
3 mins
Very
frequent
1/hour
Frequent
1/day
C4
Probable
1/week
Occasional1/monthC3Remote1/yearC1Improbable1/10yearsC2Not credible1/100yearsFrequencyC1: Damage of the accelerator equipment C2: Damaged dump blockC3: Increase in radiation of extraction equipment C4: Reduced availability
Slide6Thank you for your attention!6
Slide7Comments to the failure modes and effectsC2: Damaged dump blockSpare block availableExchanging includes: opening of the shielding, replacement, closing of the shielding, conditioning
C3: Increase in radiation of extraction equipment Longer intervention time, waiting for cooling down7