Working to the safety case
The site's safety case sets the safety classification of each function. Control systems must be designed, documented and tested to the level it requires, with evidence your safety case owners can use.
Industry brief
Nuclear
Dependable control for decommissioning, waste treatment and site services.
What matters
What matters most
Nuclear licensed sites carry out decommissioning, waste treatment and site services under close regulation by the ONR. Every change to plant and its control systems must fit the site's safety case, pass through the licensee's arrangements and be backed by evidence, often on ageing systems that have to keep running for decades.
Modifications under control
Under the site licence, changes to plant need proper categorisation, review and approval. Clear design documents, tested software and complete records make each change easier to justify and accept.
Plant that lasts decades
Decommissioning and waste programmes run for decades. Obsolete controls must be replaced without disrupting operations, with systems your team can maintain long after the project ends.
Security and cyber
Control systems on a licensed site fall within its approved security arrangements. Networks, remote access and removable media must be designed and managed to meet them.
Solutions
Solutions for Nuclear
On a licensed site, the licensee stays in control. We work within your arrangements for modifications, quality and security, match design effort and evidence to the classification your safety case sets, and prove new logic against a simulation before it reaches site. You get the design, code and records to run, maintain and justify the system.
01Ventilation and filtration control
02Waste treatment and packaging plant
03Effluent treatment plant control
04Site utilities and infrastructure
05Obsolescence upgrades and migrations
06Alarm handling and control room HMIs
How we help
What we bring to Nuclear
Standards-led, fully documented control systems that you own and can support.
Upgrades
Controller migrations
Obsolete PLCs to current platforms
In Upgrades UpgradesSoftware and firmware upgrades
Supported software versions
In Upgrades Virtual CommissioningWitnessed tests and familiarisation
Witness early, practise early
In Virtual Commissioning Virtual CommissioningChanges to running plants
Prove changes before download
In Virtual Commissioning Code DevelopmentYour standard, your blocks
To your coding standard and block library
In Code Development Code DevelopmentBrownfield: understand, then change
Existing code analysed, documented and modified
In Code DevelopmentStandards
The standards that shape your project
The standards listed are those most often relevant to control-system work in this sector. Which apply to your project, and how, is agreed with you at specification stage.
| Standard | What it covers | How we work with it |
|---|---|---|
| ONR Safety Assessment Principles | The principles the ONR uses to judge safety cases, including for control and instrumentation. | Design and evidence prepared so they support your safety case against the relevant principles. |
| Nuclear site licence conditions | Conditions on every nuclear site licence, such as LC 17 management systems and LC 22 modification. | We work within your licence-condition arrangements for design, change control and records. |
| IEC 61513 | General requirements for I&C systems important to safety in nuclear power plants. | Where your arrangements call it up, we follow its lifecycle and documentation requirements. |
| IEC 62138 | Software for computer-based nuclear I&C systems performing Category B or C functions. | Where it applies, software is developed, verified and documented to the rigour its category requires. |
| IEC 61508 | Functional safety of electrical, electronic and programmable safety-related systems, across the whole safety lifecycle. | Safety functions designed, verified and tested against their specification and target integrity. |
| Nuclear Industries Security Regulations 2003 | Security of civil nuclear sites, including cyber security, which the ONR assesses against its Security Assessment Principles. | Networks and remote access designed to fit the site's approved security plan and cyber arrangements. |
Take it with you