Turning reactive engineering into strategic asset control

Overview

This work covered a large nuclear remediation programme spanning more than 70 legacy facilities, including early reactor sites and waste processing infrastructure. Most assets were in a care and maintenance phase: no longer operational, but still carrying significant cost, risk, and regulatory responsibility across a portfolio with lifecycle cost exposure at billion-pound scale.

Engineering and maintenance processes in these environments are often inherited from the operational phase, when the asset had a different purpose and a different set of priorities. Adapting those processes to reflect where assets actually are in their lifecycle, and what they genuinely need to reach a safe end-state, is one of the defining challenges of long-term decommissioning programmes.

The Challenge

Engineering activity across the portfolio had been inherited largely intact from the operational phase, designed for assets that were running, not for assets that were winding down. Without a clear link between day-to-day engineering decisions and long-term lifecycle outcomes, it was difficult to know where investment was genuinely adding value and where effort was being absorbed without advancing the programme.

The consequence was that the full lifecycle picture was not yet visible as individual decisions were being made. As that picture became clearer over time, some earlier choices proved more costly than they needed to be, and the opportunity to avoid that cost had passed.

Solution Approach

The work began with a fundamental reframing of purpose. Engineering processes across the portfolio had been designed to keep operational assets running. Stuart changed the question the team was answering, from “how do we maintain this?” to “what does this facility need to do to reach a safe end-state, and what is the optimised intervention required to get it there?”

That reframing had to be earned before it could be formalised. In a highly regulated environment, with established processes, accumulated institutional knowledge, and multiple stakeholders with legitimate interests, a new logic does not land because it is correct. It lands because the people who need to work within it understand it, trust it, and had a hand in shaping it. Building that consensus, and creating the conditions in which the team could shape the answer, mattered as much as the framework itself.

Once that foundation was in place, the reframing was built into how the programme worked, with Stuart setting the expectations and the team developing the detail. They redefined asset purpose around current lifecycle position rather than original design intent, and assessed systems on what they needed to do now instead of what they had been built to do. Full-lifecycle plans were developed for each facility, linking maintenance decisions, intervention points, and costs to long-term outcomes. Where the reframed logic opened up alternatives, including different approaches to asset maintenance and removal, the team took them, with material reductions in both risk and lifetime cost.

The approach was formalised as the programme’s decommissioning engineering methodology. Stuart led the regulatory engagement, structuring it to test the logic under external scrutiny rather than simply to seek approval, and it received positive endorsement. The methodology did not stay within the programme. It influenced how engineering was approached across the wider organisation: the mark of a change designed to last, not just to deliver.

Outcome and Impact

The programme developed an integrated view of cost, risk, and timing across the portfolio, with many facilities brought into that picture for the first time. Engineering decisions that had previously been made in isolation were now anchored to long-term lifecycle outcomes, with the evidence to support them and the stakeholder confidence to act on them.

The financial and schedule impact was material. Multi-million-pound savings were identified and the programme duration was reduced by several years. In a portfolio carrying lifecycle cost exposure at a billion-pound scale, those gains compound.