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Fusion Science and Technology
Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has since been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that Unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. local time on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
H. Albrecht
Fusion Science and Technology | Volume 27 | Number 2 | March 1995 | Pages 25-29
doi.org/10.13182/FST95-A11963801
Articles are hosted by Taylor and Francis Online.
The main task of a Tritium Extraction System (TES) for a helium cooled Li4SiO4 DEMO blanket is the tritium recovery from a purge gas stream. On the basis of several TES proposals published for a NET/ITER solid breeder blanket, a new concept has been developed which is especially appropriate to cope with large purge gas streams.
As tritium is expected to appear in two chemical forms (HT and HTO) two specific process steps are used for its removal from the primary purge gas loop: a cooler to freeze out Q2O at 173 K (Q = H,T), and a molecular sieve bed to absorb Q2 at 78 K.
Only these components including some additional devices for the gas pre-conditioning like a compressor and a precooler, are subjected to the high gas flow rates mentioned above. All further processing is done in relatively small secondary loops during and after warmup of the cooler and the molecular sieve bed. Q2O reduction by using the water gas shift reaction, and separation of Q2 with Pd/Ag diffusors are the main process steps in the secondary loops.
The feasibility of the proposed method is very promising as all process steps are based on well known technical and radiochemical experience.