Rolls-Royce contract for Neutron Instrumentation System modernisation

Source: press release, 15 November 2018

The Rolls-Royce neutron instrumentation system allows continuous, instantaneous monitoring of nuclear power, power fluctuations, and radial and axial power distribution in the reactor
The Rolls-Royce neutron instrumentation system allows continuous, instantaneous monitoring of nuclear power, power fluctuations, and radial and axial power distribution in the reactor (photo: Rolls-Royce)

Rolls-Royce has been awarded a contract by DNMC, the operator of the two reactors of the Daya Bay nuclear power plant in China, to modernise the neutron instrumentation systems, replacing the existing analogue systems provided initially by Rolls-Royce in 1994 by new digital systems using the digital safety nuclear instrumentation & control (I&C) platform of Rolls-Royce, Spinline®.

The Neutron Instrumentation System is a key system for the safety and availability of nuclear reactors, since it measures the neutron flux of the reactor, and thus continuously and instantly monitors his power, the fluctuations of that power, as well as its axial and radial distribution within the reactor.

This modernisation project consists in the replacement of six electronic cabinets per unit, including conditioning and processing functions. The scope of Rolls-Royce for this project covers the design, manufacturing and supply. On-site installation will be performed by DNMC under Rolls-Royce supervision.

Stephane LESSI, Rolls-Royce, Civil Nuclear, Business Unit China Director, says, “We are delighted to have signed this contract with DNMC. It demonstrates the trust that the customer place in our people and technology. This extends our long-term partnership with DNMC, started more than 30 years ago.”

CHEN Junqi, DNMC, Deputy General Manager, says, “Choosing Rolls-Royce for this complex modernisation project has been natural after the completion of a first similar contract in 2017, on Ling Ao nuclear reactors. We are convinced that the experience acquired by both teams on this first project will bring benefit to the Daya Bay modernisation project.”

Spinline®technology has been chosen by more than 100 nuclear reactors worldwide, including 36 nuclear reactors in China, as safety digital I&C platform used for neutron instrumentation systems.