The Jimmy generator

is simple and safe

Jimmy's thermal generators are based on high-temperature micro-nuclear reactors (HTR) that produce the desired heat.

These reactors are well-known, very hot, and very safe.

How does the Jimmy generator work?

Operation of the generator

  • The reactor: this is where the fission reaction takes place that creates the heat needed for the industrial process
  • The control rods: they allow adjusting the reactor's power to the industrial consumption
  • Primary circulator: the circulator transports the heat from the reactor to the exchanger (4)
  • Exchanger: the exchanger transfers the heat from the primary circuit to the secondary circuit
  • Secondary circulator: the circulator transports the heat from the exchanger to the industrial circuit
  • Industrial exchanger: the industrial client draws the necessary heat from this exchanger, choosing the exit heat transfer fluid

Nominal thermal output

20 MW

Core geometry

Prismatic

Moderator

Graphite

Fuel

HALEU

Core heat

~550 °C

Primary circuit fluid

Helium

Primary circuit pressure

1.5 MPa

Secondary circuit fluid

CO2

Secondary circuit heat

~430 °C

Building structure material

Concrete

Building heigth

20 m

Building length

20 m

Building width

20 m

Operating life-time

20 years

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Inherent safety

The reactor's physics makes it harmless

These fundamental properties allow the generator to withstand any internal or external disruptions

The legacy of HTR reactors

The High Temperature Reactor (HTR) refers to a type of reactor different from the pressurized water nuclear reactors used by power plants in France.

This technology is not widely used for electricity production because it is too large. However, for industrial heat applications, it has two major advantages: exceptional safety properties and a high temperature (core at 750°C vs. 300°C for a water reactor).

The HTR has been industrialized several times in the past (UK, Germany, USA, etc.), and several units are now in operation in Japan (HTTR reactor) and China (HTR 10 and HTR PM reactors).

The HTR is identified as one of the most promising technologies by the nuclear industry (Generation IV Forum) due to its intrinsic safety properties. It is also the preferred technology for microreactor projects worldwide.

"Le HTR bénéficie du retour d’expérience d’exploitation des réacteurs HTR (High Temperature Reactor) et pourrait apporter des améliorations de sûreté notables par rapport aux réacteurs de 3ème génération" - Institut de Radioprotection et de Sûreté Nucléaire