Talk:Advanced Gas-cooled Reactor

message: What about noble gas coolants?  Do noble gases have high neutron cross sections? If not, then you might be able to have a graphite/tungsten carbide walled, noble gas (argon, helium, neon, xenon, krypton) cooled reactor reach 2000-2500C operation temperature, giving extreme theoretical thermal efficiency in a noble gas fluid based heat engine of 90% (i.e. carnot limit=1-273K/(273K+2500C))=90.1%), meaning only 10% waste and thermal pollution compared to 30-40% efficiency and 60-70% waste heat as with current reactors. Water and steam as a thermal fluid (and turbines based on them) would be totally out of the question in this scheme because at 2500C water thermolyses to oxygen/hydrogen, plus even as undecomposed as water it corrodes/dissolves wall materials. There could be coolant water attached to the low temperature end of the closed-loop heat engine (such as Stirling engines), at the 0-100C end that removes the waste heat. Sillybilly 04:20, 9 November 2006 (UTC)
replies: text: Helium was certainly a possibility, but in Europe largescale supply was difficult back in the days Magnox/AGR were designed - the U.S. would not export it as a strategic material, see .  Have you looked at the modern Very high temperature reactor and Pebble bed reactor designs? Rwendland 10:36, 9 November 2006 (UTC)
thread_title: Noble gas coolant for higher temperature

message: FYI BBC Radio 4 program on the recent AGR problems (cracks in graphite and cooling pipes) "File On 4: Nuclear blackout?"  can still be listened to on the internet at . Transcript at . Rwendland 22:40, 13 December 2006 (UTC)
thread_title: BBC radio program on recent AGR problems

message: --Lightness1024 (talk) 23:13, 28 April 2008 (UTC)
replies: text: Bugey 1 was definitely a gas-cooled reactor but I don't think that it was an AGR which was a specifically British concept. For example, I understand it used metallic uranium not uranium oxide fuel and the basic design was different. Dabbler (talk) 23:41, 28 April 2008 (UTC)
thread_title:  article : factual error ! 

message: I worked on the boron bead injection system for Hartlepool / Heysham A and the nitrogen injection system for Heysham B in the 1970s and early 1980s. My recollection is that Hartlepool / Heysham A had the boron beads as the secondary shutdown (SSD) system whereas Heysham B had the nitrogen gas as SSD.
The article currently implies that all AGRs have nitrogen SSD, but I don't recall this on Hartlepool / Heysham A. As Heysham B was a development of Hinckley Point B, could it be that Hinckley Point B and Hunterston had nitrogen for SSD and Hartlepool / Heysham A boron beads for SSD, and that the NII are now asking for boron beads for Heysham B? And what about Dungeness B's SSD?
Fsbr1908 (talk) 15:15, 7 December 2009 (UTC)
replies: text: I worked at Hartlepool and later Heysham A but not specifically on the reactor construction. As far as I recall, the reference given dates from the time before the boron bead shutdown system was decided upon and installed. I seem to recall there was a nitrogen shutdown injection at Heysham A (Hartlepool was nowhere near completion when I was there but Heysham was close). The problem I recall being discussed with the boron beads, was recovering them if you ever had to use the system and then wanted to restart the reactor. Dabbler (talk) 15:41, 7 December 2009 (UTC)
thread_title:  AGR Secondary / Tertiary Shutdown/Holddown Systems 

message: The AGR design section says "a re-entrant flow of coolant at the lower boiler outlet temperature of 278°C is utilised to cool the graphite" but the schematic diagram doesnt seem to show this or explain how the graphite can be cooler than the CO2 or steam outlet temp. Rod57 (talk) 15:42, 18 March 2011 (UTC)
thread_title:  cooling the graphite 

message: Can anyone add content or links for shutdown and safety issues, systems and procedures eg as compared to BWRs and PWRs ? Rod57 (talk) 15:42, 18 March 2011 (UTC)
thread_title: Shutdown procedures

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message: I dont understand the 'commercial operation' date for the listed reactors.
Eg, heysham 1 operating at full load before heysham 2 was commissioned.
Where do the dates come from ?, link ?  — Preceding unsigned comment added by 81.136.53.102 (talk) 09:35, 5 March 2018 (UTC)
thread_title:  Current AGR reactors