Safety case development

Oil & gas

Accelerating market entry from a timely safety case development and acceptance by the UK Health and Safety Executive

Knowledge paid dividends in achieving UK Health and Safety Executive Safety Case acceptance for new decommissioning asset.

With the increase in decommissioning activity in the North Sea and in particular plug and abandonment Well-Safe Solutions acquired the Ocean Guardian semi-submersible drilling unit during 2019 with the intention of converting it into a bespoke plug and abandonment unit.


As a new entrant into the offshore industry Well-Safe Solutions had the task of complying with the requirements of Safety Case Regulations SCR 2015.  Compliance would be achieved by developing and submitting a material change to the UK regulator for acceptance.

Having a strong background and experience in UK safety case submissions and previous experience of the Ocean Guardian HSE Case, Marex was contracted by Well-Safe Solutions to coordinate the development of the updated HSE case.


The Well-Safe Guardian HSE case was developed by Marex’s team of experienced risk consultants in accordance with the IADC HSE case guidelines. The scope of work included the review/revision of the associated formal safety assessments, including the following:

• Hazard register.

• Bowtie major accident hazard analysis.

• Summary of operational boundaries (SOOB).

• Fire and explosion analysis.

• Escape, evacuation and rescue analysis.

• Emergency systems survivability analysis.

• Quantitative risk assessment.

• PFEER assessment.

Marex’s support extended beyond initial submission of the HSE Case, and included the provision of support during the OSDR safety case assessment period. The Well-Safe Guardian HSE Case was duly accepted by the UK OSDR in December 2019, keeping Well-Safe Solutions on track for operational readiness by 1st April 2020.

Neil Smeaton

Neil Smeaton Risk manager and director

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