You'll note that the US Navy, despite this extensive experience and relative immunity to political sabotage, has not replaced its diesel fleet [correction: fossil-fuel-powered turbine fleet] with a nuclear fleet. Neither have the French, British, Chinese, Indian, Russian, or PRC navies, all of which have nuclear submarines. The Russian navy, which has built more nuclear submarines than any other, is actually transitioning to fewer kinds of nuclear-powered ships. That's because nuclear power is more expensive than diesel power, which in turn is more expensive than solar and wind power.

Moreover, it turns out that years-long construction is also the norm for naval nuclear power; for example, https://en.wikipedia.org/wiki/Borei-class_submarine says:

> The launch of the first submarine of the class, Yury Dolgorukiy (Юрий Долгорукий), was scheduled for 2002 but was delayed because of budget constraints. The vessel was eventually rolled out of its construction hall on 15 April 2007 in a ceremony attended by many senior military and industrial personnel.[11] Yuriy Dolgorukiy was the first Russian strategic missile submarine to be launched in seventeen years since the end of the Cold War. The planned contingent of eight strategic submarines was expected to be commissioned within the next decade, with five Project 955 planned for purchase through 2015.[12]

> Yuriy Dolgorukiy was not put into the water until February 2008. On 21 November 2008 the reactor on Yuriy Dolgorukiy was activated[13] and on 19 June 2009, the submarine began its sea trials in the White Sea.[14] By July 2009, it had yet to be armed with Bulava missiles and was therefore not fully operational, although it had been ready for sea trials on 24 October 2008.[15]

> On 28 September 2010 Yuriy Dolgorukiy completed company sea trials.

And on https://en.wikipedia.org/wiki/Type_094_submarine:

> A Type 094 was photographed by commercial satellites in late 2006 at the Xiaopingdao Submarine Base.[9] The first commissioned in 2007[1] and six were in commission in 2020.[5] They began nuclear deterrence patrols in December 2015.[10]

Admittedly, that's only 9 years rather than 17 years.

So, in fact, there are complicated technical challenges that create many-year-long delays. And they are not due to "political sabotaging". In cases like nuclear warfare where there is no alternative to nuclear power, it can clearly be made to work, but so far nobody has figured out how to make it economically competitive with other energy sources in situations where they are viable. That's a technical challenge nobody has been able to overcome yet.