Primary Heat Transport System Headers

1
  •    NPCIL
  •      GHAVP 1&2, Haryana
  •      16
  •     Nuclear Division

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