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PSA Engineer III

Job in Almondsbury, North Fringe of Bristol, Gloucestershire, England, UK
Listing for: Holtec
Full Time position
Listed on 2026-07-16
Job specializations:
  • Engineering
    Electrical Engineering, Systems Engineer, Environmental Engineer, Energy Engineer
Salary/Wage Range or Industry Benchmark: 90000 - 120000 GBP Yearly GBP 90000.00 120000.00 YEAR
Job Description & How to Apply Below
Location: Almondsbury

Holtec International seeks qualified applicants in its Probabilistic Safety Analysis (PSA) discipline. The PSA Engineer III will join a multidisciplinary team of engineers engaged in designing Holtec's flagship nuclear reactor SMR-300 managed by SMR, LLC, which is a subsidiary of Holtec International. Holtec International a global turnkey supplier of equipment and systems for nuclear, solar, geothermal, and fossil power generation sectors of the energy industry.

The PSA Engineer III will be responsible for leading development of PRA modules and/or associated thermal-hydraulic analyses that support risk-informed design and licensing activities. Responsibilities include development of Level 1 and Level 2 PRA models for internal and external events during full power and low power / shutdown operating modes. Engineers with a thermal-hydraulic specialization will lead RELAP5-3D and MELCOR modeling to simulate core and containment response for severe accident scenarios that inform PRA quantifications.

The Engineer III will interface with the design team to communicate and implement PSA insights, mentor junior staff, and ensure consistency and quality of all PSA deliverables.

Minimum Qualifications
  • 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)
  • Expertise with industry codes and methods associated with PSA calculations and thermal-hydraulic modeling (CAFTA, SAPHIRE, Risk Spectrum, RELAP5-3D, MELCOR)
  • 6–10 years of experience in PSA and/or thermal-hydraulic safety analysis within the nuclear industry
  • Experience with PSA specialty areas such as external hazards (fire, flood, high winds, seismic) or low power/shutdown modes
  • Comprehensive knowledge of PSA regulatory requirements and ASME/ANS PRA Standards
  • Excellent technical writing, interpersonal, and communication skills
  • Eligible to work under 10 CFR Part 810

As a technology trailblazer and a prominent innovator in clean energy (nuclear and solar) industry, Holtec strives to foster a meritocratic work environment conducive to continuous learning and professional growth of its associates. Holtec is an equal opportunity employer with a long-standing commitment to social equity and environmental justice. The company gives special preference to disabled veterans as a part of its recruitment policy.

Detailed information on the Company can be obtained by consulting the website:

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