1/16/2025 at 5:09:54 PM
For now (30 year old tech), spent nuclear fuel from Sweden is stored here submerged in 8 meters of water, in pools 30 meters below the surface:https://en.wikipedia.org/wiki/Clab
https://skb.se/projekt-for-framtiden/utokad-lagring-i-clab/
This project is about storing this spent nuclear fuel in massive 5x1 meter copper cylinders 500 meters below the surface in what's essentially solid granite.
by lysace
1/16/2025 at 11:36:54 PM
> This project is about storing this spent nuclear fuel in massive 5x1 meter copper cylindersI'll lay odds that sometime within that 100k years, someone will try to steal the copper.
by rstuart4133
1/16/2025 at 5:25:08 PM
Could submerged spent storage be used for district heating?by toomuchtodo
1/16/2025 at 6:58:39 PM
No, this states it's kept at about 35°C using a closed system that's cooled by sea water so the temperature isn't there to begin with.by phillipseamore
1/16/2025 at 7:32:38 PM
> The water in the pools also acts as a coolant. It circulates in a closed system, which is cooled by sea water. The temperature in the pools is around 35°C during normal operation. If the primary fuel cooling system should cease to function, there is a backup system. Otherwise, loss of cooling could lead to a gradual rise in temperature, causing the water to evaporate faster. There is so much water in the pools that it would take about a month before the fuel began to be exposed. This allows ample time to arrange backup cooling if needed.Does this not indicate that the water temperature could be higher, if desired? I suppose this is a function of the heat decay rate of the total mass of waste submerged.
https://www.sciencedirect.com/topics/engineering/district-he...
> With respect to district heating (DH), the recent novelty in 4th generation DH is to decrease the supply temperature even further. In low temperature district heating (LTDH) supply temperature is at 50–60 °C, and for ultra-low temperature district heating (ULTDH), the supply temperature is decreased to as low as 35 °C. Decreasing the supply temperature has several advantages, such as lower distribution heat loss, cost-efficient integration of renewable energy technologies and utilization of waste heat. On the contrary, such low temperatures cause challenges with hygienic preparation of DHW and special solutions has to be applied. In case of LTDH and ULTDH, the energy efficiency improvement is not so much related to production of DHW but rather to the entire DH system operation, and DHW is more an obstacle on the way to decrease operation temperature of DH. As stated in Ref. [62], if a 30 °C fluid supply temperature is sufficient for heating up the indoor space of a low-energy house, it is not enough for the higher temperature purposes such as DHW production at 60 °C. This limitation can be overcome by using a booster for DHW production, for example localized heat pump or electrical heater. Moreover, unlike space heating, DHW requires constant supply temperature throughout the year and does not allow for periodic temperature decrease, mainly due to comfort and risk of Legionella growth.
First fuel cycle makes the power, second fuel cycle ("waste" storage) used to keep us warm.
by toomuchtodo