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PostPosted: Jul 19, 2015 12:37 pm 
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Joined: Jul 14, 2008 3:12 pm
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http://world-nuclear-news.org/RS-Second ... 71501.html

Its hard to believe that they can't calculate and justify the source term. Its a reactor that is operating in other areas of the world!


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PostPosted: Jul 19, 2015 4:42 pm 
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Joined: Jun 19, 2013 11:49 am
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The GDA scheme is a disaster.

I think we should either scrap the entire scheme or just exempt reactors built to designs approved in other suitable regulatory regimes (places like France, the US, South Korea et. al)


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PostPosted: Jul 20, 2015 7:38 am 
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Joined: Sep 02, 2009 10:24 am
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I assume they've never taken a BWR in operation, stopped it, and then done a detailed chemical and radiological analysis, and then figured out how much could be released. They have to rely on a simulation and this is going to change over the life of the fuel rods.

A quick check shows this definition:
Quote:
The source term describes the magnitude, duration and physical and chemical
forms of a release of radioactive fission products from the containment to the
environment.


Under what scenario? At what failure temperatures? How long after refuelling?

A MSR prototype would be able to take regular samples of salt to plot compositions over time to check with the analysis. The "source term" in a MSR PSA would probably have to be under wet and dry total failure modes. Under dry failure modes, a MSR source term is going to be pretty small. But how small?

The second set of issues seem to imply insufficient imagination in developing the PSA:
- identification and prioritisation of hazards for the PSA;
- identification of internal initiating events at power;
-containment performance analyses;
- and system analyses.
The two Regulatory Queries are:
- accident sequences analyses and success criteria;
- and PSA quantification, identification of assumptions, uncertainty and sensitivity analyses, interpretation of results and use of the PSA.


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PostPosted: Jul 27, 2015 7:14 am 
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Joined: Sep 02, 2009 10:24 am
Posts: 507
A new report from the BBC here:
http://www.bbc.com/news/uk-wales-north- ... s-33655038
Quote:
Hitachi-GE says the PSA is just one of 18 different "workstreams" that makes-up the GDA process, and their resolution plan addresses concerns raised by the ONR


Anyone got a list of the 18 work streams?


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