As in do I have them ? And I ' m not interested in another pair of photons <| sep |> She hasn ' t been posting a lot lately just sort of sporadically . <| sep |> The temperature of the water is of relatively little importance . The only real hard requirement is that the core remains sufficiently submerged to prevent the hottest part of the core from maintaining a steady state temperature above 1500 degF and to keep the transient temperature less than 2200 degF . For the actual ECCS function , the temperature has relatively little impact . However there are a number of side analysis that are affected by ECCS subcooling . For a BWR , having hotter water for ECCS will improve your minimum steam cooling reactor water level limit , as MSCRWL assumes minimum ECCS injection temperature when looking at how much steam generation you have . However at the same time , warmer water will negatively affect the containment safety analysis , as your suppression pool would be closer to its heat capacity limit . Obviously I don ' t think this is going to happen at a BWR plant . For PWRs it ' s a bit different . Warmer ECCS water will negatively affect any scenario with a loss of secondary heat sink , especially if the plant is late to establish feed and bleed cooling andor only has medium head safety injection pumps . It may make it a little more difficult to establish stable or rising pressure for small break scenarios where only a partial safety injection is required . However warmer water also minimizes thermal shock issues . But the changes to these analysis is pretty low , and if secondary heat sink remains available warmer water has no real impact and may even help in medium break scenarios in certain places if the reactor coolant pumps are unable to run combined with degraded core cooling , as warmer water generates more steam for steam and boiler condenser cooling of the core . So really it ' s a toss up . The safety analysis for the various functions usually assumes the most limiting case hot or cold for various events anyways . As long as the safety analysis is met it shouldn ' t be an issue .