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After identifying all the hazards, the next step is to conduct risk analysis to understand the consequences of exposures and to define the severity and probability for each hazard.

Severity Table

The severity table describes the severity of hazard. The following table help to give a idea of how to define the severity accordingly to NTU.

Severity

Index

Severity

Description

Workplace

Safety

Workplace

Health

Environment

Fire

Damage

Downtime

Incurred

1 Critical

Fatality or

permanent loss of

limbs/ speech etc

Infection/

acute poisoning with no cure

Spills to outside campus More than $10 million damage More than 1 year for full re-installment
2

Very

Serious

Injury requiring

more than 30 days

of medical leave

Infection/ exposure with known cure but require extensive treatment

Spills to outside building

More than $1 million damage

More than 3 months for full re-installment

3 Serious

Injury requiring

more than 10 days

of medical leave

Infection / exposure with known cure but requires prolong treatment

Spills to other laboratories within the same level

More than $100k damages

More than 1 month for full re-installment

4 Marginal

Injury requiring

maximum 3 days

of medical leave

Infection / exposure with known cure but treatment needed

Spills confined to the laboratory only

More than $10k damages

More than a week for full-re-installment

5 Negligible

Simple first aid

treatment only

No exposure or no known health hazards

Spills within workplace area (e.g. fumehood) only

Less than $10k damages

No significant downtime

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Likelihood Table

The likelihood is the probability (frequency) of being affected by the hazards. It can changed depending on the existing risk controls measures (e.g. likelihood of slips, trips and falls will be reduced if there are signs to warn of the dangers of wet floor)

Risk Matrix Table

The Risk Matrix Table shows the Risk Prioritization Number (RPN) which is obtained by multiplying the Severity and Likelihood. For risks with RPN of more than 16, the work activity should not be continued until it is reduced. For risks with RPN of between 8 – 15, additional control measures should be in-place to reduce RPN to 8 and below.