pre planning submission op05 derryduff ... - Organic Power

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Intake structures A sluiced water intake/fill structure will be constructed at each reservoirs from re-inforced concrete to allow water to be drained pumped between reservoirs. The intake structure for the bottom reservoir will be located at least 15m below the lowest point of the lower reservoir to provide sufficient back pressure on the pump-turbine to eliminate cavitation. The intake structure of the upper reservoir will be located at the level of the base of the upper reservoir. Appropriate sluice controls and trashracks will be included Penstock A penstock pipe will transport the water at a rate of 25m 3 /s between reservoirs. This pipe will be situated partly over-ground and partly underground, making maximum use of the topographical features of the site. The pipe will be composed of pre-manufactured section of 18m long which are bolted together in series of 3 sections. Each series is linked to the next by a massed concrete foundation haunch. Haunches will be soaced 54m apart. Turbine • Pump-turbine (Voith Siemens) • 1 no. • Rated output: 45 MW • Turbine rated net head: 210m • Required flow rate 25 m³/s • Max. pump Head: 231m • The power plant will run fully automatically. Fig. 2 Pump Turbine Schematic Drawing (Indicative Only) 2.3.8 Construction Traffic Project generated traffic will include deliveries of plant and machinery and of oversized loads. The oversized loads will not require public road alterations. The transportation of these loads will require special permit and the consent of ‘An Garda Siochana’. Once these have been obtained the components will be transported from Ringaskiddy port to site. There will also be daily commutes of plant operators, office staff, electricians, engineers and trades people. Assuming 30 no. workers, all travelling in their own vehicles, there will be an increase of 30 vehicles commuting daily. 14 Fig. 1 Powerhouse - “White Tank” (Indicative Only) Powerhouse A pit containing a wet cylindrical well approximately 37.5m deep will house the pumpturbine on the northern side of the lower reservoir. The building pit will be enclosed by a bored piled curtain wall (~1m thick) forming a a waterproof “white tank”. This structure will be underground, and covered by a low building (See Fig. 6). Turbine Hall The structural skeleton of the building will be erected, roofed, and clad once placing of the turbine plant elements by gantry crane is complete. 2.3.5 External Service Pipes And Ducts All telecommunicatons and electrical cables for the proposed development will be buried underground under the access roads on site with a minimum of 1 meter cover from ground level, labeled with suitable yellow warning tape at 0.5m from ground surface and 0.8m from ground surface at the top of the surround gravel to warn off future excavations. Electrical cables will be run to a substation adjacent to the turbine hall. A 110kV underground cable will follow the route of the access road to the public road at the Unicorn foundation entrance, and then follow under the public road over the Derryduff bridge to Rangaroe, Coomhola, Dromduff west to Ballylickey Bridge and the connection at the ESB 110kV substation. 2.3.6 Site Works Surfacing The access roads will be paved with tarmac or finished with crushed stone, and have kerb and gullies to collect storm water runoff to sedimentation basins. 2.3.7 Plant Operational Technology Installation And Mechanical And Electrical Fit-Out Design parameters: • Location to minimize bends in the penstock pipes • Location of turbine below lake bottom • Deeper Pool at Power House containing outflow/intake structures 2.3.9 Construction Health and Safety Relevant legislation includes, ‘The Safety, Health and Welfare at Work Act 1993-2003, Irish Construction regulations 2001, and all of the other up to date Safety, Health and Welfare best practice Guidance Documents. A number of these relevant documents include PPE, Manual Handling, Working with ladders, working at night, quarrying and surface mining operations, quarry vehicles, working on in or near excavations, signage, slips trips and falls at work, working at heights. This is not an exhaustive list however these are all relevant to a large project such as a PHES development. Hazards identified associated with this project include, oversized loads, lifting materials, pipe sections and turbine components to heights, working at heights, underground power lines, electricity at commissioning, excavations, slips, trips and falls, moving vehicles and plant, etc. A 2.4m high perimeter chain link fence will be carried out around the reservoir perimeters. 2.3.10 Land Use Requirements During Construction Phase The approximate total land take required for the proposed project is given below. This area represents less than 12% of the existing upland site, which is defined as lands within the site boundaries of the property involved in the project, which are not forested or improved for grazing (116ha). Item Area [m2] Access Road to Site 10000 Area of Surfaced Roads 33670.3 Buildings 3840 Upper Reservoir 30072.5 Lower Reservoir 41288.5 Penstock 4629.4 Stillin Basins 2699.4 Peat stock pile 1 8720.8 Peat stock pile 2 2690.9 Total land use requirement 133771.8
2.3.11 Waterworks Top Reservoir Design: • Gravity Rockfill Dam with vertical steel enforced concrete walls on the upstream side – ring structure, partly concrete gravity dam with buttresses • Reservoir Bed: asphaltic liner (e.g. top to bottom: with mastic coating, asphalt concrete, bituminized binder course, asphalt filter, asphalt binder, gravel layer) • Drainage system to monitor possible seepage and a fibre optic leakage detection system • Intake structure: side intake structure • Trashrack • Freeboard: 0.5 m (based on max. wind speed ever recorded in Ireland [56 m/s] 300m fetch, 15m depth) • Wave wall 0.5m high on upstream edge of the dam Penstock Design: • 1 pipe running through gorge with as few as possible direction changes. Changes of less than 10° are more or less negligible in terms of friction, bigger changes will cause increasing friction meaning a loss in efficiency • Internal Pipe diameter expected at 2.5m (depending on required flow rate (anticipated between 25 m³/s) • Pipe partly over ground level; could be mounted on Stilts (anchored into the rock); partly bruied in a trench. • Pipe material: glass-fibre-reinforced, polymer mortar or steel pipes Fig. 6 Penstock - Steel Pressure Pipe (Indicative Only) Fig. 3 Top Reservoir - Road on Dam Crest (Indicative Only) Fig. 4 Top Reservoir - Gravity Rockfil Dam with partly vertical steel inforced walls (Indicative Only) Bottom Reservoir Design: • Two Gravity Rockfill Dams - one to the south and one small one next to the forestry; upstream face: asphaltic lining • Reservoir Bed: asphaltic liner (e.g. top to bottom: with mastic coating, asphalt concrete, bituminized binder course, asphalt filter, asphalt binder, gravel layer) on top of natural bedrock • Drainage system to monitor possible seepage and a fibre optic leakage detection system • Outlet structure: draft tubes, draft tube extensions serve as outlet (part of power house structure) • Trashrack • Spillway • Freeboard: • 0.5 m (based on max. wind speed ever recorded in Ireland [56 m/s] 300m fetch, 15m depth) • Wave wall 0.5m high on upstream edge of the dam Stilling Basins (sedimentation ponds): Design: • 3 basins in a row at three different height levels (“steps”) • Position: Below main gravity dam – lower reservoir Grid Connection (at Ballylickey Bridge 110kVGrid substation) Via underground (under public road) 7km cable (110kV) Rerouted Stream The lower reservoir will be situated on the existing route of the Derryduff stream. Consequently the stream will have to be re-routed to allow the construction of the lower reservoir. The new route will be west of the lower lake parallel to its bank and bring the stream via a channel to the middle of the crest of the main dam and connect to a “mini-penstock” for a Unicorn Micro-hydroelectric Scheme. 2.3.12 Construction Timetable The following proposed construction schedule is anticipated to start within 12 months of receipt of planning and grid permits. Once construction is started, commissioning is projected within 30 months. Activity Table 1: Proposed Construction Schedule - Derryduff - Cappanabrick Duration (Month 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Fig. 5 Lower Reservoir - Rockfill Dam with Asphaltic Liner(Indicative Only) 1.) Construct access bridge off main road / ford 2.) Site access Clearance & Site Compound Setup 3.) Construct access road to lower lake 4.) Lower Lake soil/peat excavation 5.) Construct access road to upper lake 6.) Lower Lake rock removal & formation of banking/retaining walls 7.) Construction of Turbine Carvern to lower lake 8.) Upper Lake soil/peat excavation 9.) Upper Lake rock removal & formation of banking /retaining walls 10.) Construction of Upper Lake Inlet Structure 11.) Excavation & foundation works for pipe line path 12.) Laying of High-Pressure Pipeline from upper to lower lake 13.) Apply water tight asphalt lining to upper and lower lakes 14.)Fit-out of Cavern- Pump Turbine, Generator etc 15.) Construction & fit-out of Transformer building 16.) Laying underground/overground high voltage cable from site to nearest local network 17.) Testing/Commissioning
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pre planning submission op05 derryduff ... - Organic Power

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