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18.2 Risk Control Log

Table 18.2 presents a summary of the assessment of shipping and navigation hazards scoped into the risk assessment.
This includes the frequency of occurrence, severity of consequence and significance of risk for each hazard.

Table 18.2: Risk Control Log – Array In Isolation

Description of Impact	Phase	Severity of Consequence	Frequency of Occurrence	Significance of Risk	Additional Measures	Residual Risk
Increased vessel to vessel collision risk resulting from displacement (third-party to third-party)	Construction	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Increased vessel to vessel collision risk resulting from displacement (third-party to third-party)	Operation and maintenance	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Increased vessel to vessel collision risk resulting from displacement (third-party to third-party)	Decommissioning	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Displacement from adverse weather routeing	Construction	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Displacement from adverse weather routeing	Operation and maintenance	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Displacement from adverse weather routeing	Decommissioning	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Increased vessel to vessel collision risk resulting from displacement (third-party to project)	Construction	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Increased vessel to vessel collision risk resulting from displacement (third-party to project)	Operation and maintenance	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Increased vessel to vessel collision risk resulting from displacement (third-party to project)	Decommissioning	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Vessel to structure allision risk	Construction	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Vessel to structure allision risk	Operation and maintenance	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Vessel to structure allision risk	Decommissioning	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Reduced access to local ports and harbours	Construction	Minor	Remote	Broadly acceptable	None	Broadly acceptable
Reduced access to local ports and harbours	Operation and maintenance	Minor	Remote	Broadly acceptable	None	Broadly acceptable
Reduced access to local ports and harbours	Decommissioning	Minor	Remote	Broadly acceptable	None	Broadly acceptable
Loss of station	Construction	Serious	Negligible	Broadly acceptable	None	Broadly acceptable
Loss of station	Operation and maintenance	Serious	Negligible	Broadly acceptable	None	Broadly acceptable
Loss of station	Decommissioning	Serious	Negligible	Broadly acceptable	None	Broadly acceptable
Reduction of underkeel clearance as a result of subsea infrastructure	Construction	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Reduction of underkeel clearance as a result of subsea infrastructure	Operation and maintenance	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Reduction of underkeel clearance as a result of subsea infrastructure	Decommissioning	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Anchor interaction with subsea cables (including dynamic cabling)	Construction	Moderate	Extremely unlikely	Broadly acceptable	None	Broadly acceptable
Anchor interaction with subsea cables (including dynamic cabling)	Operation and maintenance	Moderate	Extremely unlikely	Broadly acceptable	None	Broadly acceptable
Anchor interaction with subsea cables (including dynamic cabling)	Decommissioning	Moderate	Negligible	Broadly acceptable	None	Broadly acceptable
Anchor interaction with mooring lines	Construction	Moderate	Negligible	Broadly acceptable	None	Broadly acceptable
Anchor interaction with mooring lines	Operation and maintenance	Moderate	Negligible	Broadly acceptable	None	Broadly acceptable
Anchor interaction with mooring lines	Decommissioning	Moderate	Negligible	Broadly acceptable	None	Broadly acceptable
Reduction in SAR capability	Construction	Serious	Remote	Tolerable	None	Tolerable and ALARP
Reduction in SAR capability	Operation and maintenance	Serious	Remote	Tolerable	None	Tolerable and ALARP
Reduction in SAR capability	Decommissioning	Serious	Remote	Tolerable	None	Tolerable and ALARP

Table 18.3 Risk Control Log - Cumulative

Description of Impact	Phase	Severity of Consequence	Frequency of Occurrence	Significance of Risk	Additional Measures	Residual Risk
Increased vessel to vessel collision risk resulting from displacement (third-party to third-party)	All	Serious	Extremely unlikely	Tolerable	Consultation with the MCA and NLB on the cumulative lighting and marking and charting of the Array and other relevant developments.	Tolerable and ALARP
Displacement from adverse weather routeing	All	Serious	Extremely unlikely	Tolerable	Consultation with the MCA and NLB on the cumulative lighting and marking and charting of the Array and other relevant developments.	Tolerable and ALARP
Increased vessel to vessel collision risk resulting from displacement (third-party to project)	All	Serious	Extremely unlikely	Tolerable	None	Tolerable and ALARP
Vessel to structure allision risk	All	Serious	Extremely unlikely	Tolerable	Consultation with the MCA and NLB on the cumulative lighting and marking and charting of the Array and other relevant developments.	Tolerable and ALARP
Reduced access to local ports and harbours	All	Minor	Negligible	Broadly acceptable	None	Broadly acceptable
Reduction in SAR capability	All	Serious	Remote	Tolerable	None	Tolerable and ALARP

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