Instrument Assistant

Job Title:                      Instrument Assistant

Location:                     Seascale, Cumbria

Compensation:            Attractive Salary + Benefits

Role Type:                   Full time / Permanent 

Role ID:                       SF76228

Help maintain the equipment that helps protect people, sites and the environment.

At Cavendish Nuclear, we’re working to create a safe and secure world, together. If you join us, you can play your part as an Instrument Assistant at Sellafield, near Seascale, Cumbria.

The role

As an Instrument Assistant, you’ll have a role that’s out of the ordinary. This is a hands-on, varied role where you'll work as part of a specialist team, supporting essential operations that protect people, infrastructure and the environment. You'll gain valuable experience in a highly regulated industry while contributing to work that makes a real difference to national capability and security.

This role is full time, working 37 hours per week, based at Sellafield. Set working times are Monday to Friday, 07:30 to 15:30. This is an onsite position.

Day-to-day, you’ll be required to:

• Carrying out maintenance, repair and practical workshop tasks on radiation protection instrumentation and associated equipment.  
• Supporting the manufacture and repair of leads, detectors and related components.
• Maintaining workshop areas through effective housekeeping, waste disposal and equipment care.
• Supporting operational and maintenance activities within workshops and customer facilities, including radiologically controlled areas.
• Working safely with sealed radioactive sources while identifying opportunities to improve service quality and efficiency.

Essential experience of the Instrument Assistant:

• Holding a full UK driving licence.
• Demonstrating a practical, hands-on approach to work.
• Using basic hand tools safely and effectively.
• Following procedures and instructions while working independently when required.
• Maintaining high standards of safety, quality and housekeeping.

Qualifications for the Instrument Assistant:

• GCSEs (or equivalent qualifications).

Security Clearance

The successful candidate must be able to achieve and maintain Standard (BPSS) / Security Check (SC) / Counter Terrorist Check (CTC) security clearance for this role. Further details are available at United Kingdom Security Vetting: clearance levels - GOV.UK (www.gov.uk)

What we offer

• Generous holiday allowance
• Matched contribution pension scheme, with life assurance
• Access to a Digital GP, annual health check, and nutritional consultations through Aviva DigiCare+
• Employee share scheme
• Employee shopping savings portal
• Payment of Professional Fees
• Reservists in the armed forces receive 10-days special paid leave
• 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.
• ‘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
• Excellent development opportunities and benefits package including an employee assistance programme supporting physical, mental and financial wellbeing.

Cavendish

We’re Cavendish Nuclear — a team of c5,000 specialists and a core part of Babcock International Group.

Here, you’ll be part of something bigger. Across clean energy, defence, and civil decommissioning, your work will contribute to projects that are critical to energy security and national protection. Together, we’re shaping a future that lasts — not only through the impact we make, but through meaningful careers that respect your work-life balance.

Join us and discover how far we can go, together.

We are a disability confident committed employer. If you have a disability or need any reasonable adjustments during the application and selection stages, please email careers@babcockinternational.com with the subject header ‘Reasonable adjustments requirement’. We’re committed to building an inclusive culture where everyone’s free to thrive. We are happy to talk about flexible working – please ask about alternative patterns of work at interview.

Closing date:   14/10/2026

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