The issue of ‘unplanned’ maintenance outages causing disruptions to ‘planned’ maintenance schedules has been a significant problem in the UK’s nuclear submarine fleet. This situation has put additional pressure on the boats waiting for their scheduled maintenance, increasing wear-and-tear on the vessels.
One of the most notable cases of such maintenance outages was the seven-year long maintenance outage of the ballistic missile submarine HMS Vanguard from 2015 to 2022. This extended outage was triggered by reports of observed reactor malfunctions from the Naval Reactor Test Establishment (NRTE).
The NRTE had highlighted risks such as potential failure of the reactor primary coolant circuit, leakage of highly radioactive fission products, and significant risks to life and public safety. These reports led to the decision to close down the NRTE in 2015 and shift towards computer modeling analysis for new reactors and cores, including the AUKUS SSNs.
The delay in the maintenance and delivery of submarines, such as the Astute class SSNs, has led to increased costs and pressure on the existing fleet. The decommissioning and dismantling of nuclear submarines have also faced technical problems and delays, with the UK storing more decommissioned submarines than operational ones.
The management of radioactive waste from nuclear submarines remains a challenge in both the UK and Australia, with no clear solution in place. The interactions between nuclear submarines and civilian vessels have resulted in incidents leading to loss of life and vessels, highlighting the need for improved protocols and transparency in submarine operations.
The flaws in the official monitoring and dosimetry programs for nuclear submarine bases have raised concerns about the exposure of coastal populations to radioactivity. Case studies have shown discrepancies in dose pathways and the transfer of radioactivity from sea to land.
Countries like Belgium, Canada, and France have implemented measures such as pre-distribution of iodine in the vicinity of nuclear reactors to mitigate risks. However, decisions on such measures have not been made in Australia yet.
Tim Deere-Jones, a maritime studies expert, has extensively researched the British experience with nuclear-powered submarines and highlighted lessons that can be learned for Australia. His report delves into the behavior and fate of marine radioactivity, hazardous shipping accidents, and the implications of nuclear submarine operations.
This comprehensive overview underscores the challenges and complexities associated with nuclear submarine operations and maintenance, emphasizing the need for robust protocols, transparency, and proactive measures to ensure the safety of both naval personnel and the general public.
