Recent content by kollier

The Peak Clad Temperature for AP1000 is 1840 for 50 percentile and for its upper confidence bound of uncertainty it will pass 2100 F also. I think also 1800 F is the temperature that metal water reaction becomes dominant.

Did you mean that the acceptance critera have margin with realistic safety limit? I have read somwhere that this 2200 F & 0.17 of oxidation will lead to fragmentation of the clad. I think that these criteria don't have any margin with safety limit. I might find the reference if needed.

It was my mistake, Petrangeli doesn't say that fissuring "starts" at 800-900C. It is written in page 21 of the book: "The first consequences of uncontrolled overheating of the core are the fissuring of the fuel claddings (at about 1073–1173K (800–900C)), while their normal operating...

As it is stated in 10 CFR 50.46 maximum clad temperature should not exceed 2200 F(1204 C) but I have read in "Nuclear Safety" by G. Petrangelli that fissuring of the cladding starts at about 800-900 C. I want to know the safety limit or margin for cladding in NPPs. I could't find any...

I know also German designers use four 50% eccs trains( except accumulators that are 8) (i.e. N+2 ,N=2)

Yes I mean two steam generators by 2loop. and by eccs train I mean high head safety injection system(HHSI) and low head safety injection sysytem(LHSI).I want to know how many hhsi and lhsi systemes they use. I found that number of accumulators are equal to the number of loops except german...

Thanx gmax In the book I have mentioned it is written that for two loop plants in the US there are 2 or 3 trains of eccs systems. Although they're old where can I find their information?

Although now I'm gathering case information about redundancy concept with focus on PWRs and I need information about ECCS systems in PWR plants but any other information about redundancy in other plants will be useful. I found http://mit.edu/canes/publications/book.html" very useful and I...

Hi Folks I'm studying about redundancy concept in nuclear power plants. I want to find a list of all nuclear power plants in which the number of safety(eccs) trains are mentioned.

"SBO disel generator" or "emergency disel generator" the problem is! Thanks astronuc but I didn't get my answer yet! I think your answer says why Disel Generators are used in the plant as EDGs. Please think about this question: what is the difference from safety aspect of a plant with 3 EDGs...

Really I want to know the philosophy of using Diesel generator as an AAC source.

Thanx gmax By the way what is the difference from safety aspect of a plant with 3 EDGs and 1 SBO diesel generator and the same plant with 4 EDGs?

http://www.epr-reactor.co.uk/ssmod/liblocal/docs/V3/Volume%202%20-%20Design%20and%20Safety/2.I%20-%20Auxiliary%20Systems/2.I.5/2.I.5.2%20-%20Diesel%20Generator%20Units%20-%20v2.pdf

Really SBDGs are smaller than EDGs. In EPR reactor design SBDG must work within about 2 hours after station blackout, in which DC power supplies are available. The question is why there are SBDGs with lower electrical capacity?

Thanks Astonuc Which properties of SBDG's make them different from EDGs? I mean for example why we don't use 3 EDGs instead of 2 EDGs and one SBDG ?