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Risk Analysis & Assessment
4th IED
2012 - 2013
Prepared by :
Abdullah Essam Mohamed Sonosy
Ahmed Magdy Yahia Mohamed
Hajar Rajab
Presented to :Dr/ Eslam El Helaly
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Contents
Definitions
Hazard Analysis
Risk Matrices
Hazard Analysis Report
Example for Mini Baja
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Definitions
Safety: The condition of being safe; free from danger, risk, or injury.
Hazard: An activity or condition that is dangerous, that poses the threat of loss(property damage) or harm (personal injury or death).
Risk: The potential for loss or harm over time for a given hazard; the combination ofhazard severity and the exposure.
Severity: The degree of the loss or harm associated with a hazard.
Risk Tolerance: The acceptable of level of risk selected for all hazards.
Mitigation: An action taken or a feature adopted to reduce the risk for a hazard. Forexample, safety devices, guarding, warning devices, procedures, and training.
Hazard Assessment: A process of identifying and analyzing sources of danger.
Risk Analysis: A process of evaluating the severity of consequences and frequency ofexposure to hazards, and evaluating of risk tolerance and mitigation.
Risk Management: Activities related to monitoring and evaluating hazards tomaintain a given level of risk.
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Hazard Analysis
Steps in Hazard Analysis
1. Identify Risk Tolerance: Determine levels of acceptable risk.Create risk assessment matrix (risk level v. severity and exposure).
2. Hazard Assessment: Identify hazards by reviewing designs,
codes, standards, and interviewing workers and users.3. Evaluate SeverityandFrequency of Exposure: Assign
severity and frequency of exposure for each hazard.
4. Assign Risk Level: Categorize each hazard to a risk level using therisk assessment matrix.
5. Design Mitigation: Apply mitigation to hazards withunacceptable risk levels.
6. Repeat Hazard Analysis: Repeat until all hazards have anacceptable risk level.
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HA Flow Chart
Identify All Hazards
Risk Assessment Matrix
Determine Severity
and
Frequency of Exposure
Apply Mitigation
Assign Risk Level AcceptableUnacceptable
Next Hazard
For Each Hazard
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Risk Matrices
Risk matrices are probably one of the mostwidespread tools for risk evaluation. They are mainlyused to determine the size of a risk and whether ornot the risk is sufficiently controlled.
There are two dimensions to a risk matrix. These two
dimensions create a matrix. The combination ofprobability and severity will give any event a place ona risk matrix.
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Example :Risk Matrix
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Risk Analysis
Risk Level
(1) High
Imperative to reduce risk level.
(2) Medium Requires a mitigation plan.
(3) Low No special risk mitigation activities are required.
Severity of Consequences
(1) Catastrophic
Death or system loss.
(2) Critical - Severe injury or major system damage.
(3) Marginal - Injury requiring medical attention or system damage.
(4) Negligible - Possible minor injury or minor system damage.
Frequency of Exposure
(A) Frequent - Expected to occur frequently.
(B) Probable - Will occur several times in the life of an item.
(C) Occasional - Likely to occur sometime in the life of an item.
(D) Remote - Unlikely, but possible to occur in the life of an item.
(E) Improbable - So unlikely, it can be assumed occurrence may not be experienced.
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Hazard Analysis Report
Hazard Analysis Report
Section 1. Definition of Severity and Frequency ofExposure
Section 2. Risk Assessment Matrix
Section 3. Itemized list of Hazards, Initial RiskLevel, Mitigation and Final Risk Level
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Example: Mini-Baja HAR
Hazard No. Hazard Frequency Severity Initial Risk Level Mitigation Final Risk Level
Collisions
1 Other Driver error B 1 High Restraint system, bumpers, side & rear-view mirrors, training Medium2 Steering Failure D 2 Medium Heavy-duty rack & pinion, bumper to cover steering Low
3 Brake Failure D 1 High Emergency brake system, shut-off switches Medium
4 Operator error A 2 High Restraint system, padded frame structure, bumpers, training Medium
5 Rough terrain B 3 Medium Restraint system, padded frame structure, training Low
Fire
6 Fuel spill C 2 High Firewall, fire extinguisher, looped fuel line system Low
7 Engine damage D 3 Low Firewall, debri guard Low
8 Welding error C 2 High Welding masks & gloves, fire extinguisher, isolated welding area Low
Projectiles9 Debris from terrain B 3 Medium Mud-guards, debri wall for whole cockpit Low
10 Chain failure B 3 Medium Transmission cage Low
11 Suspension failure D 3 Low Suspension limiters, bumper guards Low
12 Engine explosion D 1 High Firewall, Engine cage, eye protection when working with engine Medium
Frequency of Exposure Severity
Catastrophic (1) Critical (2) Marginal (3) Negligible (4)
Frequent (A) A1 A2 A3 A4
Probable (B) B1 B2 B3 B4
Occasional (C) C1 C2 C3 C4
Remote (D) D1 D2 D3 D4
Risk Levels High Medium Low
1 Catastrophic major injury to driver, spectators
2 Critical damage to property, and/or minor injury
3 Marginal damage to vehicle only
4 Negligible reparable damage to vehic le only, no injuries
A Frequent every time it is driven
B Probable with every race
C Occasional during/following repair
D Remote not expected during the life of the vehicle
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Example: BattleBot HAR
Hazard No. Hazard Description Initial Risk Category Initial Risk Level Mitigation Final Risk Category
Collision
1 transmitter failure 1C Medium fail safe mechanism 3C
2 receiver failure 1C Medium fail safe mechanism 3C
3 controller failure 1C Medium fail safe mechanism 3C
4 driver error 1C Medium training 2C
5 accident 2C Low no necessary mitigation required 2C
Pneumatics
6 seal failure 1C Medium must have a burst disk 3C
7 tank failure 1C Medium protection on all sides 2C
Battery
8 Burns 2C Low no necessary mitigation required 2C
9 Shock 2C Low no necessary mitigation required 2C10 Fire 1C Medium must be insulated from electrical components and pneumatics 3C
Motors
11 Shock 2C Low no necessary mitigation required 2C
Weapon
12 misfires 1C Medium safety restraints 3C
13 operator error 1C Medium training 3C
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Thanks