Senior Nuclear Thermal Hydraulics Consultant

Frazer-Nash Consultancy; Manchester; Hybrid; GBP 71,000 - 82,000; Full time

Benefits offered by this job

25 days' holiday

Enhanced parental benefits

Company pension scheme

Bonus scheme linked to company performance

Life assurance and private healthcare membership

Paid membership fees for professional accreditation

Job summary

Frazer-Nash Consultancy is seeking a Senior Nuclear Thermal Hydraulics Consultant in Manchester or Bristol. The role involves developing advanced thermal-hydraulic models for nuclear systems, performing analyses for safety cases, and offering expertise in judgement and reporting. The successful candidate will be expected to manage client interactions and contribute to business development. This position features a competitive salary, flexible hybrid working arrangements, and various benefits including professional development and a company pension scheme.

Qualifications

• Strong understanding of fluid flow, heat transfer, thermal hydraulics and multiphase flows.
• Demonstrable experience in nuclear thermal hydraulics supporting plant design and/or operations.
• Ability to interpret, validate and clearly explain complex modelling outputs.

Responsibilities

• Develop and maintain thermal‑hydraulic models of nuclear plant systems using industry‑standard codes.
• Analyse fault sequences, transients and system behaviours to inform design decisions.
• Support model verification, validation and best-practice application.

Skills

Fluid flow

Heat transfer

Thermal hydraulics

Multiphase flows

Communication skills

Education

Degree in Engineering, Physics, Applied Mathematics or related discipline

Tools

RELAP

GOTHIC

CATHARE

TRACE

VIPRE

S5K

Job description

Senior Nuclear Thermal Hydraulics Consultant

Salary range: £71,000–£82,000 per annum. Location: Manchester or Bristol. Working pattern: flexible hybrid model, time split between office, client sites, and home.

This role is pivotal in shaping safety decisions for next‑generation nuclear systems. The successful candidate will contribute to the development, validation and application of advanced thermal‑hydraulic models, support safety cases and aid regulatory and design decisions across the UK nuclear portfolio.

Key Responsibilities

• Develop and maintain thermal‑hydraulic models of nuclear plant systems using industry‑standard codes.
• Analyse fault sequences, transients and system behaviours to inform design decisions and nuclear safety cases.
• Provide authoritative interpretation of model results and underlying physical phenomena.
• Support model verification, validation and best‑practice application.
• Communicate complex technical outputs clearly and concisely to clients, regulators and internal stakeholders.

Technical Experience & Qualifications

• Strong understanding of fluid flow, heat transfer, thermal hydraulics and multiphase flows.
• A degree in Engineering, Physics, Applied Mathematics or a related discipline, or equivalent relevant experience.
• Demonstrable experience in nuclear thermal hydraulics supporting plant design and/or operations (codes such as RELAP, GOTHIC, CATHARE, TRACE, VIPRE, S5K).
• Experience of transient and fault analysis within nuclear safety contexts.
• Ability to interpret, validate and clearly explain complex modelling outputs.

Personal & Consultancy Skills

• Ability to independently manage and deliver work to meet client requirements.
• Experience contributing to proposal writing, client liaison and business development.
• Strong communication skills, with the ability to engage effectively through meetings, presentations, written reports, commercial bids and technical discussions.

Due to the nature of the work, candidates must undergo pre‑employment screening and satisfy clearance criteria for UK National Security Vetting.

Benefits

• Competitive salary with annual reviews.
• 25 days’ holiday, with the option to buy up to five additional days.
• Flexible and hybrid working arrangements.
• Enhanced parental benefits.
• Company pension scheme.
• Targeted professional development and career support.
• Life assurance and private healthcare membership.
• Bonus scheme linked to company performance.
• Paid membership fees and support towards professional accreditation.
• Cycle to Work scheme and season ticket loan.
• A range of flexible benefits, tailored to your personal requirements.