Risk & Assurance
Barrier Health
Every critical control, safety instrumented function, trigger action response plan (TARP) and pressure-containment barrier in one live view, with the reason each one is effective, impaired or unverified.
IEC 61511 SIF (PFDavg) & GISTM Tailings / Ground-Control TARP Co-Optimizer
Computes live Probability of Failure on Demand (PFDavg = λDU·TI/2) and enforces operating interlocks when protection layers or TARP triggers are degraded.
| Barrier | Hazard | State | Basis | Due / last | Owner |
|---|---|---|---|---|---|
HV isolation and earthing (dragline) Critical control · Bengalla Mine (Hunter Valley) | Electric shock and arc flash | impaired | Status verification_due, verification overdue | 2026-10-23 | Electrical Engineer |
Stockpile thermal monitoring Critical control · Bengalla Mine (Hunter Valley) | Spontaneous combustion | impaired | Status degraded, verification overdue | 2026-10-27 | CHPP Superintendent |
Spoil dump stability inspection Critical control · Bengalla Mine (Hunter Valley) | Ground failure (spoil) | impaired | Status effective, verification overdue | 2026-10-26 | Dragline Supervisor |
Highwall prism monitoring Critical control · Bengalla Mine (Hunter Valley) | Ground failure (highwall) | impaired | Status effective, verification overdue | 2026-10-27 | Geotechnical Engineer |
Conveyor belt rip detection (CV-02) Critical control · Bengalla Mine (Hunter Valley) | Belt rip causing fire and long outage | impaired | Status failed | 2026-10-31 | Fixed Plant Superintendent |
Dragline boom structural monitoring Critical control · Bengalla Mine (Hunter Valley) | Structural failure of the dragline boom | impaired | Status overdue, verification overdue | 2026-10-24 | Dragline Superintendent |
Dragline spoil movement TARP Trigger action response plan (TARP) · Dragline spoil — Strip 13 | Spoil failure onto exposed coal | impaired | Declared level 1 | 2026-10-25 | Geotechnical Engineer |
Highwall Strip 14 displacement TARP Trigger action response plan (TARP) · Highwall Strip 14 | Highwall failure | impaired | Measurement stale | 2026-10-26 | Geotechnical Engineer |
CHPP fire deluge Critical control · Bengalla Mine (Hunter Valley) | Fire in the CHPP | effective | Verified within frequency | 2026-11-14 | CHPP Superintendent |
Mine Water Dam wall inspection Critical control · Bengalla Mine (Hunter Valley) | Dam failure | effective | Verified within frequency | 2026-10-29 | Environment Superintendent |
Windrows on haul roads and dumps Critical control · Bengalla Mine (Hunter Valley) | Vehicle over edge | effective | Verified within frequency | 2026-10-28 | Mining Supervisor |
Mobile plant fire suppression Critical control · Bengalla Mine (Hunter Valley) | Fire on mobile plant | effective | Verified within frequency | 2026-11-30 | Maintenance Superintendent |
Haul truck proximity detection Critical control · Bengalla Mine (Hunter Valley) | Vehicle interaction | effective | Verified within frequency | 2026-10-30 | Mining Superintendent |
Conveyor pull-wire emergency stops Critical control · Bengalla Mine (Hunter Valley) | Entanglement in conveyors | effective | Verified within frequency | 2026-11-13 | Fixed Plant Superintendent |
An unverified barrier is not treated as effective. States are derived from recorded verification dates, proof tests, TARP levels and thickness measurements against each record's own frequency and limits. The site's safety case, major hazard management plan and engineer-of-record instructions take precedence.