JGL Corporate brochure - Flipbook - Page 32
06.
Case studies, our projects
HINKLEY POINT C, FISH RETURN SYSTEM,
SOMERSET
Our experience is a key factor for a successful sea outfall project
at one of the UKs biggest ever construction sites.
Client:
Main contractor:
EDF
New Nuclear Builds
Sector:
Energy
Project duration:
Ongoing
Scope of works
Sustainability and innovation
At Hinkley Point C, we’re delivering the Fish Return
System (FRS) outfall tunnel as part of a £20m package
for EDF Energy - designed to safely return fish to the
Bristol Channel while protecting the marine ecosystem.
»
High quality pipe manufacturing procedures
»
Effective tunnel delivery
»
Safe methodology (closed face versus open face)
The works involve technically challenging tunnelling
beneath a live nuclear construction site, with precise
alignment into an outfall with complex logistics
governed by restricted access and gradient tolerances.
Challenges
Complete recycling of process water
»
No discharge of tunnel effluent without treatment
»
TBM wet recovery above seabed
»
All tunnel arisings reused on site
»
Only biodegradable chemicals used in the construction of
the tunnel
Tunnel boring machinery launch and breakthrough at
a steep downhill angle with highly-restricted working
space.
»
Pipe jacking expertise
»
Up to 2.4 bar hyperbaric interventions
»
Hyperbaric interventions
»
Vertical, S curves
»
Off-shore TBM recovery
»
Breakthrough to a 45m long concrete offshore structure
»
Specialised tunnelling and lifting equipment
»
Adverse marine weather conditions
»
Curved tunnel with gyroscopic navigation
»
Second highest tidal range in the world.
»
Separation system allowing full recycling of process water
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Joseph Gallagher Group | CORPORATE PORTFOLIO | 2026
Our expertise and solutions
