Nuclear/Mechanical Engineer - HFIR PVR Project

Strata-G, LLC; Oak Ridge (TN); On-site; USD 120,000 - 180,000; Full time

Job summary

A leading engineering firm in Oak Ridge, TN is seeking an experienced Nuclear/Mechanical Engineer for the HFIR PVR Project. This role requires over 10 years of hands-on experience at a nuclear reactor, with a strong background in welding, joining techniques, and machine design principles. The ideal candidate will support engineering designs for reactor structure upgrades and apply relevant codes including ASME. This full-time position is on-site only and offers an opportunity to work on critical projects in a collaborative environment.

Qualifications

• Minimum of 10 years in DOE nuclear facilities and/or commercial nuclear plants.
• Comprehensive understanding of nuclear technology, including reactor safety basis.
• Strong ability to read and interpret mechanical design drawings.

Responsibilities

• Apply engineering expertise to support HFIR operations.
• Prepare engineering designs for new installations.
• Perform calculations and analyses to support design basis requirements.
• Apply codes and standards (ASME B&PVC, ASME B31, NQA-1, AWS).
• Support development of reactor core component replacement plans.
• Prepare design specifications and acceptance criteria for upgrades.
• Update material specifications and assist procurement.
• Implement modifications per RRD configuration control processes.

Skills

Welding and joining techniques

Machine design principles

Proficiency in engineering design

AutoPIPE

Welding and joining

Machine design

GD&T

Education

Bachelor's degree in mechanical engineering, nuclear engineering, or related discipline

Tools

Finite element analysis software

Finite element analysis

GD&T (ASME Y14.5)

Job description

At Strata-G, we define significance by the extraordinary people we hire, the relationships we build with our clients, and the positive impact we make in the community. Our team of intellectually curious and highly motivated engineers, scientists and business professionals engages with our clients to solve complex energy and environmental challenges around the world.

We are driven by our values to create a culture of significant and positive change for our clients and the world.

We Care We treat our customers and employees as we wish to be treated. Integrity We are honest and ethical in every endeavor. Service We continuously strive to please our customers and to exceed their expectations. Quality We maintain a culture of continuous improvement. Safety We hold paramount the safety and health of our associates, our customers, the public, and the environment. Innovation We develop creative solutions to better serve our customers. Attitude We maintain a positive attitude and value humor. Outreach We share the results of our successes with the community.

Strata-G is seeking an experienced Nuclear/Mechanical Engineer - HFIR PVR Project with the following:

Summary

Client is currently preparing for two exciting major replacement projects, the reactor pressure vessel and the beryllium reflector, to sustain and enhance HFIR’s operation performance. Both projects require engineering, design, and analysis support to complement the integrated project team to deliver the design milestones on schedule and within scope. Specifically, the individual will be working closely with system engineers, designers, and various other disciplines within RRD. This position will be assigned to the HFIR Upgrades Project Office and interacts with personnel at all levels within HFIR.

The project is seeking an experienced engineering professional with over 10 years of hands‑on experience at an operating nuclear reactor, including expertise in engineering design and manufacturing practices. The ideal candidate will have a strong background in welding and joining techniques, combined with a solid understanding of machine design principles.

This role requires a comprehensive knowledge of ASME Boiler and Pressure Vessel Codes (Sections III and VIII) and ASME B31.1 piping codes, with proven ability to apply these standards in practical scenarios. The position involves performing and reviewing piping analyses and calculations in compliance with HFIR Safety Basis Procedures and applicable Department of Energy (DOE) standards and guidelines.

Additionally, this role will support efforts to restore HFIR’s operating power from 85 MW back to 100 MW as part of the PVR Project. This project is currently in the early stages of Critical Decision‑1 (CD‑1), as defined by DOE Order 413.3B.

Responsibilities

• Apply engineering expertise to support HFIR operations.
• Prepare engineering designs for new installations and for replacement or upgrade of HFIR structures, systems, and components (SSCs).
• Perform calculations and analyses to support design basis and requirements.
• Apply relevant codes and standards, including ASTM, ASME Boiler and Pressure Vessel Code, ASME B31 piping codes, NQA‑1, AWS, etc.
• Support development of reactor core component replacement plans.
• Prepare design specifications and define acceptance criteria for component upgrades.
• Update material specifications and provide technical support for material procurement.
• Implement modifications in accordance with RRD configuration control processes.

Requirements

• Bachelor’s degree in mechanical engineering, nuclear engineering, or related discipline.
• Minimum of 10 years in DOE nuclear facilities and/or commercial nuclear plants.
• Comprehensive understanding of nuclear technology, including reactor safety basis, design, and construction.
• Proficiency in engineering design and manufacturing practices, including welding and joining techniques and machine design.
• Familiarity with DOE Orders and Standards (e.g., DOE O 420.1C, DOE STD 1189, DOE STD‑1073‑2016).
• Strong ability to read and interpret mechanical design drawings and apply GD&T principles (ASME Y14.5).
• Experience with AutoPIPE and finite element analysis is desirable.
• Experience with configuration management and engineering change control processes in a nuclear environment.

Job Type

Full Time

Job Location

Oak Ridge, TN. Onsite only.

Strata-G will not sponsor applicants for immigrant or non‑immigrant work visas. The successful candidate will be required to submit evidence of identity and employment authorization. Tests for the absence of any illegal drug as defined in 10 CFR 707.4, will be conducted by Strata‑G and a background investigation by the Federal government may be required to obtain an access authorization prior to employment. Strata‑G is an Equal Employment Opportunity (EEO) employer. It is the policy of the Company to provide equal employment opportunities to all qualified applicants without regard to race, color, religion, sex, sexual orientation, national origin, age, gender identity, protected veteran or disabled status. All job descriptions are evaluated for physical/mental standards prior to posting based on AAP guidelines.