HPC Development Site: cooling water infrastructureIn the District of West Somerset and the County of Somerset and the territorial sea
Work No. 2A
A cooling water intake tunnel for seawater extraction, with an internal diameter of 6m, commencing at the Cooling Water Forebay for Unit 1 (Work No. 1A(d)), including earthworks and tunnelling, down to approximately 40m below Ordnance Datum as it crosses the coastline, with an upward gradient meeting the offshore vertical shafts, Work No. 2B, offshore at approximately 35m below Ordnance Datum and generally running in a north-westerly direction for a distance of approximately 3.4km, the location of which is shown on sheet nos. 3 and 4.
Work No. 2B
Two off-shore intake heads for seawater extraction, associated acoustic fish deterrent systems and navigational aids and vertical shafts with an internal diameter of 4.6m, including excavation and capital dredging works, commencing from Work No. 2A, located approximately 200m apart, the locations of which are shown on sheet no. 4.
Work No. 2C
A second cooling water intake tunnel for seawater extraction, with an internal diameter of 6m, commencing at the proposed Cooling Water Forebay for Unit 2 (Work No. 1A(e)), including earthworks and tunnelling, down to approximately 40m below Ordnance Datum as it crosses the coastline, with an upward gradient meeting the vertical shafts, Work No. 2D, offshore at approximately 35m below Ordnance Datum and generally running in a north-westerly direction for a distance of approximately 3.5km, the location of which is shown on sheet nos. 3 and 4.
Work No. 2D
Two off-shore intake heads for seawater extraction, associated acoustic fish deterrent systems and navigational aids and vertical shafts with an internal diameter of 4.6m, including excavation and capital dredging works, commencing from Work No. 2C, located approximately 200m apart, the locations of which are shown on sheet no. 4.
Work No. 2E
A cooling water outfall tunnel for seawater return, with an internal diameter of approximately 7m, commencing in the location shown on sheet no. 3, approximately 25m below Ordnance Datum at the landward end with a downward gradient meeting the vertical shafts, Work No. 2F, offshore at approximately 35m below Ordnance Datum and running in a north-westerly direction for a distance of approximately 1.8km, the location of which is shown on sheet nos. 3 and 4.
Work No. 2F
Two off-shore outfall heads and vertical shafts for seawater return, with an internal diameter of 4.6m, commencing from Work No. 2E, including excavation and capital dredging works, located approximately 75m apart, the location of which is shown on sheet no. 4.
Work No. 2G
A fish return tunnel, with an internal diameter of approximately 1 m, commencing in the location shown on sheet no. 3 including earthworks and tunnelling falling to approximately 15m below Ordnance Datum at its lowest point before rising to the sea bed and meeting Work No. 2H at a point approximately 500m north of the shore, the location of which is shown on sheet no. 3.
Work No. 2H
An off-shore sea bed fish return outfall with an internal diameter of approximately 1m commencing from Work No. 2G, including excavations, located at the offshore terminus of Work No. 2G, the location of which is shown on sheet no. 3.