Coolant storage system

During startup and control processes, coolant is pumped, after passing the coolant purification system, into the coolant storage system for interim storage. In the coolant treatment system, it is separated by evaporation into demineralized water and boric acid concentrate containing about 7000 ppm B. The distillate then is directed to the coolant storage system, while the boric acid concentrate is transferred to the boric acid and demineralized water control system, from where it can be fed into the primary system via the volume control system, when required. 

RCCS air ducts 26 - primary coolant purification system 27 - helium transportation and storage system ... 

Fuel Storage and Handling Systems Heat Removal Capability. The fuel storage and radioactive waste storage systems shall be provided with systems to protect coolant inventory and remove residual heat under normal operation, AOEs and DBAs with a high degree of reliability. 

In the pool concept, all of the main primary heat transfer equipment is contained within a relatively large reactor vessel, which also includes the reactor core (and the necessary in-vessel fuel storage, if desired). All of the primary sodium is within this vessel, which requires a minimum of penetrations. A typical arrangement is shown in Fig. 7 for a six-coolant loop system. Vertical coolant circulation pumps, immersed in a section of the pool, pump sodium through the core, then to the intermediate heat exchangers. The primary sodium then returns to the outer region of the pool. Nonradioactive secondary sodium flows out of the intermediate heat exchanger (IHX) to a secondary heat transfer system essentially identical to that of the loop concept. One pool reactor (EBR-II) is currently in operation. 

The safety improvements use redundancy and diversity to prevent and mitigate lents. The safety injection system (SIS) and emergency feedwater system (EFWS) are dedicated four train systems. Containment spray and safety injection pumps take water from the in-containment water storage tank (IRWST), thus, eliminating the need to switch from an external source and provide a. semi-closed system with continuous recirculation. Emergency core coolant flows direc nto the... 

Postulate a model. In Example 12.1 we observed that a jacketed cooler is a multicapacity process. For our problem we can identify the following three interacting capacities in series (1) heat capacity of tank s content, (2) heat capacity of the coolant in the jacket, and (3) heat capacity of the tank s wall. Therefore, our first suggestion is to use a third-order overdamped model without significant dead time. A closer examination of the physical system reveals that the tank s wall does not possess significant capacity for heat storage and could be omitted. Consequently, we suggest a second-order model without dead time of the form... 

Liquid anhydrous ammonia is used extensively as a coolant in heat exchange systems because of its chemical stability, low corrosiveness, and high latent heat of vaporization. However, anhydrous ammonia is readily contaminated during handling and storage. The gas chromatographic analysis of trace contaminants (O2, N2, CO, CH4, CO2, and water) in liquid ammonia was described by Mindmp and Taylor. An F M Model 5750 equipped with a Carle Microcavity Thermistor detector was used with dual columns for analysis. Table 9.3 lists the experimental parameters for both columns, which were conditioned for a minimum of 12 h at a temperature of 180°C and a... 

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