Job Title: Instrument Assistant
Location: Sellafield, Cumbria
Compensation: Attractive Salary + Benefits
Role Type: Full time / Permanent
Role ID: SF
At Cavendish Nuclear we’re working to create a safe and secure world, together, and if you join us, you can play your part as an Instrument Assistant, at our Sellafield, Cumbria site.
The role
As an Instrument Assistant, you’ll have a role that’s out of the ordinary. You will play a hands-on role in supporting the repair, maintenance, and calibration of radiation protection instruments—helping to ensure safety and precision in critical environments.
Day-to-day, you’ll
1. Ensure safe working practices in line with safety, quality, environmental, and site requirements.
2. Support operations and maintenance activities across workshops and radiological controlled areas, including safe handling of radioactive sources.
3. Work independently and proactively within provided instructions to complete tasks efficiently.
4. Identify and implement service improvements, and confidently use basic hand tools.
5. Manufacture electrical leads to support the maintenance and servicing of radiological equipment.
This role is full time, 37 hours per week, and is based on site at Sellafield, Cumbria.
Essential experience of the Instrument Assistant:
6. Demonstrated experience working within structured industrial health and safety management systems, ensuring compliance with established protocols and promoting a safe working environment.
Qualifications for the Instrument Assistant:
7. Minimum of GCSE-level education (or equivalent), demonstrating strong foundational skills in English, mathematics, and science.
8. Full, valid United Kingdom driving licence required for travel between sites and operational locations.
Security Clearance
The successful candidate must be able to achieve and maintain Standard (BPSS) security clearance for this role. Further details are available at
What we offer
9. Generous holiday allowance
10. Matched contribution pension scheme, with life assurance
11. Access to a Digital GP, annual health check, and nutritional consultations through Aviva DigiCare+
12. Employee share scheme
13. Employee shopping savings portal
14. Payment of Professional Fees
15. Reservists in the armed forces receive 10-days special paid leave
16. Holiday Trading is a benefit that allows UK Cavendish employees to buy additional leave or to sell up to one working week of annual leave from their annual entitlement. This Window opens February through to March annually.
17. ‘Be Kind Day’ enables employees to take one working day's paid leave a year (or equivalent hours) to undertake volunteering work with their chosen organisation or registered charity
18. Excellent development opportunities and benefits package including an employee assistance programme supporting physical, mental and financial wellbeing.
Cavendish Nuclear
As a leader within the UK nuclear industry, Cavendish Nuclear, part of