The book pretty much summed up my point that the problems with the reactors lies with their maintenance issues, rather than actual failures for their systems. That is the problem with certain authors and publications : in that they say that a certain system has problems but then fail to clarify the nature and depth of the said problem which leads to a whole sale assumption that the system was entirely faulty when in reality it isn't.
The K-27 was the first submarine to trial the new reactor, so of course problems are to be expected. But the subsequent boats that uses the same reactors does not suffer the same issues.
HI Sutton summed it up pretty accurately
"This last feature of the lead-bismuth reactor was also its Achilles’ heel. If the temperature of the reactor dropped below 125 °C (257 °F) then the reactor solidifies and cannot be brought back. Ever. This happened to the lead boat, K-64, in 1972, resulting in an early departure from service."
The USSR had designed steam stations at port for the purpose of heating the reactors when not in use but the lack of funding meant that the facilities never performed as expected.
Does this mean that the reactor's design is defective ? Of course no,the Alfa sub, like any other weapon system, does not exist in a void. It dependent on the network of other systems in order to function. Again, the system works perfectly well with the appropriate facilities and if you have a problem with that, then you did have a problem with a heck of a lot of modern weapon systems that are veritably green house plants atm.
The simple fact is that the USSR at that time cannot afford an whole horde of steam yards functioning for the Alfa's. But the Alfa cannot be faulted for USSR's budgetary concerns which are entirely separate from its capabilities.