Energy From Thorium Discussion Forum

It is currently Feb 18, 2018 3:34 am

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Feb 12, 2018 11:20 am 
Offline

Joined: Feb 28, 2011 10:10 am
Posts: 349
Canada is part of the Generation IV consortium. Its main nuclear lab, CNL (former AECL), is focusing on developing a supercritical water reactor which uses pressure tubes (1200MWe in power), building upon its experience and its familiarity with CANDUs.

The CNL Nuclear Review dedicated a whole issue (winter 2016) to this specific topic:

http://pubs.cnl.ca/toc/cnr/5/2

It seems an interesting concept, also because it intends to use a Pu-Th-U233 fuel cycle in the future, but I wonder about its viability and how such a pressure tube SCWR stacks up against the SCWR with a regular RPV, considering the high pressure involved (>25 MPa) and temperatures (>600 degrees C).

Any thoughts on this ?


Top
 Profile  
 
PostPosted: Feb 12, 2018 8:17 pm 
Offline

Joined: Apr 19, 2008 1:06 am
Posts: 2239
The solution to high pressure problem is a low vapor pressure coolant. The moderation could be left to exotic heavy water.
The coolant could be a molten salt, carefully balancing between neutron economy and cost. Stable hydrocarbon could also be selected.
A bigger tank of an economical coolant could act as a heat store and cover load following to an extent.


Top
 Profile  
 
PostPosted: Feb 13, 2018 12:24 pm 
Offline

Joined: Jun 19, 2013 11:49 am
Posts: 1499
I've been very interested in the PT-SCWR for a long time.

The high efficiency pressure tubes (where the load bearing segment is in thermal contact with the calandria and not the coolant) they propose are far more likely to be practical, in my opinion, than the enormous pressure vessels that pressure vessel SCWRs would require.
Indeed I am not convinced a forged SCWR pressure vessel is even possible, I think prestressed vessels would be required.


Top
 Profile  
 
PostPosted: Feb 14, 2018 12:11 am 
Offline

Joined: Apr 19, 2008 1:06 am
Posts: 2239
The reaction space, either the vessel or tubes have a high radioactivity and temperature. It would be best to move the high pressure of steam or supercritical water to generation area like the steam generator. The initial heat transfer should best be at a manageable pressure.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group