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Parameter


Potential Maintenance Activity


replacement Paint and repair


J-Tube and ladder cleaning


Cable


Additional cable laying within a new location


Maximum number of cables and cable lengths: (i) 550km AC interarray cables;13x10km HVAC interconnector three-core cables; 4x100km of HVDC export cables.


Cable inspection Any additional vessels required assumed to be within the worst case of 6 work boat vessels per day.


Cable burial using surface protection


Assessment includes: (i) protection required at all export offshore cable corridor crossings - 40 crossings identified (4 EAONE export cables x 10 existing/planned cables); (ii) protection required at all inter-array cable crossings - 5 crossing identified. Each crossing assumes area of 100m (50m either side of the crossing) x 6m x 1m height required. (iii) Additional scour protection assessed within East Anglia ONE site see "Additional scour protection around foundations".


Worst Case Assessed in the Environmental Statement


FurtherWorks/ Annex 1 Surveys /Action Needed


required


No further action required


No further action required


Alert the MMO - review availability of current survey data in proposed location


No further action required


Alert the MMO - review availability of current survey data if activities are outside the project envelope. For activities within the project envelope, no further action required (to be reviewed triennially)


Outline Operations and Maintenance Monitoring Plan Offshore


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