Senior Thermohydraulic Analyst

At Blykalla, we're transforming the future of nuclear power by developing innovative Small Modular Reactors (SMRs). Our mission is

to create a new generation of nuclear energy systems that are safer, more efficient, and environmentally friendly. As Sweden's

only developer of SMRs, we're at the forefront of a groundbreaking industry.

You will be the senior in-house thermohydraulic analyst for Blykalla's fluid systems, executing the one-dimensional and

system-level calculations that underpin the design of the primary loop, the safety-classified systems, and the balance of plant.

This means building and running the system codes that the system engineers scope, from steady-state performance and pressure drop

budgets, through transient and accident analyses, to natural circulation and passive safety demonstrations.

The role is analytical, hands-on, and cross-cutting. You will not own individual systems, but you will support every system

engineer in the team with the calculations they need, and you will be one of the senior technical voices Blykalla relies on when

the numbers get hard.

• Build and maintain one-dimensional thermohydraulic models of the full plant and of individual loops, using nuclear system codes

such as CATHARE, APROS, RELAP5, TRACE, MELCOR, or equivalent.

• Verify the plant thermohydraulic models against experimental data from the Oskarshamn test facility and from the open

literature, and document assumptions and limitations.

The Senior Thermohydraulic Analyst sits in the Fluid Systems Engineering Team within Blykalla, and reports to the Manager of Fluid

Systems Engineering.

You will collaborate daily with the fluid system engineers, and interface closely with the Nuclear and Safety, Test and

Validation, as well as with academic and industrial partners on code validation and experimental campaigns. We are a diverse team

that is passionate about our work and Blykalla.

You will be part of a highly skilled team with a can-do attitude. We value personnel chemistry and strive to create a workplace

where you enjoy coming to. There are however a few things that we think will help for you to succeed in this role, these are:

• More than 8 years of professional experience as a thermohydraulic analyst in the nuclear industry or in a closely related field

with equivalent analytical depth.

• Deep hands-on experience with at least two nuclear system-level thermohydraulic codes (CATHARE, APROS, RELAP5, TRACE, MELCOR,

or equivalent), with a track record of building and running plant-scale 1D models from scratch.

• Strong fundamentals in single-phase and two-phase thermohydraulics, natural circulation, heat transfer correlations, and

reactor safety analysis.

• Comfort designing nodalisation strategies, selecting constitutive models, and defending modelling choices in technical and

regulatory settings.

• Basic familiarity with CFD tools (STAR-CCM+, ANSYS Fluent, OpenFOAM, or equivalent), sufficient to interpret results produced

by others and to identify where 3D analysis complements the 1D work.

Take the chance to be at the forefront of revolutionizing nuclear power. Join our team as Senior Thermohydraulic Analyst and help

shape the energy landscape of tomorrow. Apply today with your resume and a cover letter highlighting your relevant experience and

achievements.

We are proud to foster an inclusive workplace free from discrimination. We strongly believe that diversity of experience,

perspectives, and background will lead to a better environment for our employees and a better product. This is something we value

deeply and we encourage everyone to be a part of changing the way the world thinks about power supply!