"New" nuke reaches criticality last month

[OVERKILL]

Originally Posted By: Koz1
The quick shutdown will quickly render the core sub critical. In other words it will still produce alot of heat just not critical amounts to allow them to mitigate the problem and then, you know the drill, they still think they will have power.


They don't word it that way. It states:

Quote:
Following shutdown, the amount of energy produced by the reactor decreases rapidly.

The nuclear fuel will, however, continue to produce some heat and must be cooled.

That heat, called decay heat, represents a small fraction of the heat produced during normal operation.


They say "some heat", not a lot of heat.

 

[Koz1]

Originally Posted By: OVERKILL
Originally Posted By: Koz1


They state, This delays the progression of severe accidents and provides additional time for mitigating actions to be taken. If there is no power at all the mitigating will be very narrow and limited.

They still think they will have power at a Severe accident.


Which link is that from? And yes, they probably would expect to have backup generator and/or battery power with a Severe incident.


http://www.candu.com/site/media/Parent/EC6 Technical Summary_2012-04.pdf

 

[Koz1]

Originally Posted By: OVERKILL
Originally Posted By: Koz1
The quick shutdown will quickly render the core sub critical. In other words it will still produce alot of heat just not critical amounts to allow them to mitigate the problem and then, you know the drill, they still think they will have power.


They don't word it that way. It states:

Quote:
Following shutdown, the amount of energy produced by the reactor decreases rapidly.

The nuclear fuel will, however, continue to produce some heat and must be cooled.

That heat, called decay heat, represents a small fraction of the heat produced during normal operation.


They say "some heat", not a lot of heat.


The difference between Sub Critical and Critical is large, if you think the heat output from Sub Critical will be small well I don't agree.

Anyways I hope the World Transitions to Thorium sooner rather than later.
Cheers have a great weekend.

 

[OVERKILL]

Originally Posted By: Koz1
Originally Posted By: OVERKILL
Originally Posted By: Koz1


They state, This delays the progression of severe accidents and provides additional time for mitigating actions to be taken. If there is no power at all the mitigating will be very narrow and limited.

They still think they will have power at a Severe accident.


Which link is that from? And yes, they probably would expect to have backup generator and/or battery power with a Severe incident.


http://www.candu.com/site/media/Parent/EC6 Technical Summary_2012-04.pdf


Yes, I just found it, is is from the Enhanced CANDU sheet, not the previous links (where I was looking). Those are designed to work as a collective, and as you will note, there are a number of them. That is above and beyond the system we already discussed.

 

[OVERKILL]

Originally Posted By: Koz1


The difference between Sub Critical and Critical is large, if you think the heat output from Sub Critical will be small well I don't agree.

Anyways I hope the World Transitions to Thorium sooner rather than later.
Cheers have a great weekend.

You too.