Editing Trafalgar-class submarine (section)

===Service problems===
In 1998, ''Trenchant'' experienced a steam leak, forcing the crew to shut down the nuclear reactor. In 2000 a leak in the [[Rolls-Royce PWR|PWR1]] reactor primary cooling circuit was discovered on ''Tireless'', forcing her to proceed to [[Gibraltar]] on diesel power.<ref name=large-2005>{{Cite web | url=http://www.largeassociates.com/TirelessKurskForensic.pdf | title=Forensic Assessments of the Nuclear Propulsion Plants of the Submarines HMS Tireless and RF Northern Fleet Kursk | first=John H. |last=Large | author-link=John H. Large | publisher=Institution of Mechanical Engineers seminar: Forensic Investigation of Power Plant Failures | access-date=2007-03-22 | date=March 2005 | url-status=dead | archive-url=https://web.archive.org/web/20070927034246/http://www.largeassociates.com/TirelessKurskForensic.pdf | archive-date=27 September 2007}}</ref> The fault was found to be due to thermal fatigue cracks, requiring the other ''Trafalgar''-class boats, and some of the remaining ''Swiftsure''-class boats, to be urgently inspected and if necessary modified.<ref name=large-2005 />

In 2013 the Defence Nuclear Safety Regulator reported that the reactor systems were suffering increasing technical problems due to ageing, requiring effective management. An example was that ''Tireless'' had had a small radioactive coolant leak for eight days in February 2013.<ref name=guardian-20130804>{{cite news |url=https://www.theguardian.com/uk-news/2013/aug/04/ageing-nuclear-submarines-sailors-report |title=Ageing nuclear submarines could put sailors and public at risk, report warns |first=Rob |last=Edwards |newspaper=The Guardian |date=4 August 2013 |access-date=7 August 2013 }}</ref>