PSA Engineer I

Holtec; Almondsbury; Hybrid; GBP 55,000 - 75,000; Full time

Benefits offered by this job

Health insurance

Annual leave 25 days

Hybrid work

Education assistance

Pension & life insurance

Job summary

Holtec is seeking a Probabilistic Safety Analysis (PSA) Engineer I to contribute to risk-informed design and safety analyses for the SMR-300 project. You will develop PRA models, support thermal-hydraulic calculations, and interface with design teams to implement PSA insights.

The role offers relocation assistance and a hybrid work model in the Almondsbury area, with opportunities to collaborate across safety analysis, licensing, and systems engineering teams.

Qualifications

• BS degree in nuclear or mechanical engineering from an accredited university.
• Familiarity with thermal-hydraulic behavior of LWRs.
• 2–4 years of PRA or thermal-hydraulic safety analysis experience.
• Eligible to work under 10 CFR Part 810.

Responsibilities

• Support development of PRA modules and thermal-hydraulic analyses under senior engineers.
• Develop Level 1 and Level 2 PRA models for internal/external events in various operating modes.
• Support RELAP5-3D/MELCOR modeling for severe accident scenarios.
• Develop event/fault trees to estimate CDF and LRF.
• Maintain PSA models as the SMR-300 design matures.
• Interface with design teams to implement PSA insights and ensure deliverable quality.

Skills

Technical writing

Interpersonal communication

Education

BS degree in nuclear or mechanical engineering

Tools

CAFTA

SAPHIRE

RiskSpectrum

RELAP5-3D

MELCOR

Job description

The Probabilistic Safety Analysis (PSA) Engineer I will support the development and application of Probabilistic Safety Assessment (PSA) methodologies for Holtec International's SMR-300 advanced nuclear reactor program. Working within a multidisciplinary engineering team, this role will contribute to risk-informed design, safety analysis, licensing activities, and regulatory compliance by developing and maintaining probabilistic risk models and supporting thermal-hydraulic safety evaluations. The position offers the opportunity to work on next-generation nuclear technology while collaborating with reactor design, safety analysis, licensing, and systems engineering teams to ensure safe, reliable, and efficient plant performance.

Location:

Almondsbury (Bristol Area), UK – Relocation Assistance Available!

Primary Responsibilities:

• Support development of PRA modules and/or associated thermal-hydraulic analyses under the supervision of senior engineers.
• Develop Level 1 and Level 2 PRA models for internal and external events during full power and low power / shutdown operating modes.
• Thermal-hydraulic analysis specialization: support RELAP5-3D and MELCOR modeling to simulate core and containment response for severe accident scenarios that inform PRA quantifications.
• Logic modeling specialization: support development of event trees and fault trees to estimate key design risk metrics including core damage frequency (CDF) and large release frequency (LRF).
• Support PSA model maintenance and updates that occur periodically as the SMR-300 design matures
• Use PSA results to support implementation of risk-informed programs; for example, Regulatory Treatment of Non-Safety Systems (RTNSS), Design Reliability Assurance Program (D-RAP), 10 CFR 50.69 risk-informed categorization and treatment of SSCs.
• Interface with the design team to communicate and implement PSA insights
• Ensure consistency and quality of all PSA deliverables

Requirements:

• B.S degree in nuclear engineering, mechanical engineering, or closely related field from an accredited college or university
• Familiarity with thermal-hydraulic behavior of light water reactors (LWRs)
• Familiarity with probabilistic risk assessment and/or thermal-hydraulic analysis methods for light-water reactors
• Exposure to industry codes such as CAFTA, SAPHIRE, RiskSpectrum, RELAP5-3D, or MELCOR
• 2-4 years of experience in probabilistic risk assessment and/or thermal-hydraulic safety analysis for nuclear facilities
• Excellent technical writing, interpersonal, and communication skills
• Eligible to work under 10 CFR Part 810

A Generation Ahead by Design

Investing in people who power the future.

We believe great work deserves great rewards. Our benefits go beyond the basics, reflecting our commitment to supporting your whole self…your health, your future, and your career growth. This includes:

• Private health insurance for physical and mental health, 24/7 GP access, dental/optical cashback and travel insurance for you and your family
• 25 days annual leave plus bank holidays, with Christmas shutdown
• Hybrid work opportunities available where business needs and role requirements allow
• Education assistance to support continued professional growth, reimbursement of professional membership fees
• Employer matched pension contributions, life insurance, enhanced maternity/paternity benefits

If you’re driven to solve meaningful challenges and make a lasting impact, we invite you to build your career at Holtec—a generation ahead by design.