Include section on rationale for important decisions that were made in the past (coolant, NACC, etc.).
CAD model is broken right now (some pipes were not built to be moved).
Need rupture disk on low pressure end of air duct.
CTAHs could be open-pressurized.
When in shutdown cooling mode, air at outlet of compressor is at ~400°C, by-passes heat exchanger, goes through 2 stages of expansion, therefore ends up at significantly colder temperatures.
May want to by-pass some flow from compressor outlet through CTAHs to heat air up and mix with cold air.
For startup, need to integrate with neutronics model. 2 startup conditions:
From fresh fuel
From equilibrium fuel
Because the 2 CTAH loops are independent, need to design pump control strategy (2 pumps) to keep salt temperatures coming from 2 CTAHs into cold leg at same temperature (in order to avoid large delta T across reactor vessel). Other adjustable inputs to achieve this are control rod positions.
Need to validate some control strategies with CIET (distortion from having only one pump and one heat exchanger).
Also need to assess risk of freezing from cold air exchanging heat with salt.
Plant arrangement (see pictures)
Switch to cylindrical building, ~ 24 m diameter, ~ 35 m high
Need some kind of holes over CTAH vessels
Minimum distance between inner wall and center of any element that will need to be pulled out is determined by crane capacity (investigate and select crane) (see picture)
Space between refueling deck and roof of building must be tall enough to accommodate reactor vessel
Use AP1000 and NGNP (pre-conceptual design) for overall dimensions
Ballpark sizing of water pools for TCHX
1% total power for 72 hours (1% is a good average over 72 hours)