RE: [cdn-nucl-l] cdn-nucl-l: poison injection as a fast shutdown system

["Pomirleanu, Radu" <PomirlR@westinghouse.com>]

Simon,

In a PWR plant design, there used to be a fast shutdown mechanism based on
boron injection. However, keeping a tank with a high concentration of boron
was a problem in itself (boron crystallizes!), so some utilities suggested
removing this system. I am not aware if this system is still implemented in
the current PWR plant design.

Cheers,
Radu Pomirleanu

> ----------
> From: 	Simon Day[SMTP:dayse@mcmail.cis.mcmaster.ca]
> Sent: 	Friday, August 02, 2002 2:18 PM
> To: 	Canadian Nuclear Discussion List
> Subject: 	Re: [cdn-nucl-l] cdn-nucl-l: poison injection as a fast
> shutdown system
> 
> Ben, Adam, Jeremy and others who replied off list,
>     Thank you for the information on the CANDU SDS-2 system.  Yes, that
> Darlington figure of -55 mk stands out against the others.
>     So, following the non-CANDU road now, the impressions are that
> poison injection is not used as a fast shutdown mechanism for PWRs or
> even BWRs.  Is this indeed the case and if not, the remaining question I
> have is whether it is possible and if so how is it done, to inject
> soluble poison into a high pressure system.
>     Fast shutdown systems for a PWR/BWR?  Rods plus .... ? ..... One
> thought was depressurization of the core as that would lead to voiding.
> Interesting as that is a self-limiting type system.  Thoughts?
> Have a nice long weekend folks,
> Simon
> 
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