Nuclear Power Plant Safety Systems - Part 2: Controlling the reactor

This CNSC video series explains the main safety systems of Canadian nuclear power plants. Part 2 presents the main systems involved to ensure reactor shutdown and reactor control during normal operation. All of these systems are maintained and inspected regularly, and upgraded when necessary, to ensure plants meet or exceed strict safety standards established by the CNSC.
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[@LFTRnow]

I recall visiting Pickering Nuclear 30 years ago and they said there were 2 out of 3 safety shut down systems on each reactor. I only saw two mentioned here. I think the third one was draining the moderator (heavy water) but wouldn't that create a problem for dealing with decay heat?
What was that third method? Why isn't it mentioned here?

[@LFTRnow]

That wasn't what I was referring to, but it really makes a lot of sense. You wouldn't want false reactor trips, so you monitor multiple channels. No, I was referring to multiple shutdown methods, not sense channels.

[@dubiouswords7851]

@@LFTRnow Pickering A has the feature to dump the moderator, however this design feature was not included in subsequent CANDU plants, because while it is adequate for most potential accidents, it was inadequate for a large break loss of coolant accident where a very fast shutdown method is required (i.e., high rate of negative reactivity). Subsequent CANDU plants use two independent safety systems (i.e., the shutoff rods, and fast injection of neutron poison into the moderator) to cater to all the potential accident scenarios. Meanwhile, Pickering A's design was augmented with an enhanced shutdown system which provided a second set of triplicated trip sensors and trip logic for the same set of shutoff rods.

[@LFTRnow]

@@dubiouswords7851 Thanks a lot! That makes a lot of sense. I really appreciate you taking the time to reply to my question.

[@mitchsfarm]

It's be phased out in the newer generation reactors. There is no dump tank after Pickering. Bruce A / B both do not have dump tanks for moderator, niether does Darlington.

[@Tom.Balitcho]

Can i use this video and put it in my channel For the educational purpose cuz i will translate it to arabic language

[@cnscccsn]

You do not need to ask permission if you just include our video in a playlist. However, can not upload it to your channel.

[@aprogress2374]

So, even after shutdown, the reactor still need to cooling down. That's why fukushima nuclear reactor melt down after tsunami.

[@WadcaWymiaru]

CANDU prove to be good desing, but...there is a problem: still use solid fuel that overheated, can melt. And have no wolfranium coat! So we need even better reactor...that work in high temperature, small pression and don't need uranium!