Smart JSA Bridge

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OSHA & ANSI STANDARD

Risk Classification &Risk Matrix Guide

Establish a scientific safety management systembased on OSHA guidelines and Quantitative Risk Assessment.

1. Basic Definitions by Work Nature

General Work (Routine)

Tasks performed frequently where hazards are effectively mitigated through established Standard Operating Procedures (SOPs).

High-Risk Work (Non-Routine)

Activities involving hazardous energy or complex environments where a single failure can result in a fatality or catastrophic incident.

2. Quantitative Criteria (Risk Matrix)

Risk Score=Frequency×Severity

Risk Matrix (5 Frequency × 4 Severity)

Frequency \ SeveritySeverity
1
Negligible
2
Marginal
3
Critical
4
Catastrophic
Frequency
5
Frequent
5
Minor Risk
10
Medium Risk
15
High Risk
20
Unacceptable
4
Probable
4
Minor Risk
8
Low Risk
12
High Risk
16
Unacceptable
3
Occasional
3
Negligible
6
Minor Risk
9
Medium Risk
12
High Risk
2
Remote
2
Negligible
4
Minor Risk
6
Minor Risk
8
Low Risk
1
Improbable
1
Negligible
2
Negligible
3
Negligible
4
Minor Risk

3. 9 Types of High-Risk Activities

Work at Heights

Work at 4ft (General Industry) or 6ft (Construction) where fall protection is mandatory.

Confined Space Entry

Entry into areas with limited access and potential for toxic atmosphere or O2 deficiency.

Hot Work

Welding, cutting, or brazing activities that produce sparks or open flames.

Lifting Operations

Rigging and hoisting loads using cranes, derricks, or powered industrial trucks.

Electrical Work

Work on energized equipment or within limited approach boundaries (NFPA 70E).

Trenching & Excavation

Ground disturbance where cave-ins or underground utility strikes are potential hazards.

Ionizing Radiation

Industrial radiography or NDT tasks involving exposure to radiation sources.

HazMat Handling

Transfer, charging, or processing of toxic, flammable, or reactive hazardous substances.

LOTO / Maintenance

Lockout/Tagout procedures during maintenance to control hazardous energy.