Description

The Reactor Header Assemblies form part of two independent and parallel coolant loops of the Primary Heat Transport System for 700 MWe PHWR. The process fluid is re-circulating heavy water which extracts heat from the reactor fuel and raises steam in the steam generators for the turbine. Each header is a single piece of seamless construction, with integral nozzles.

Construction details

Materials: Forgings of SA350 Gr LF2

Dimensions:

• Overall length of each header: 15m
• Outlet header: 508 mm OD, 65 mm thk
• Inlet header: 457 mm OD, 65 mm thk

Critical aspects

• Design pressure: 126 kg/cm2(g)
• Design temperature: 326ºC
• Hydro Test Pressure: 158 kg/cm2(g)
• Helium Leak Test : Acceptable leak rate 1.0 x 10-6 STD. cc/sec