### Skapa referens, olika format (klipp och klistra)

**Harvard**

Winges, J. (2011) *Transport effects at control rod tips*. Göteborg : Chalmers University of Technology

** BibTeX **

@mastersthesis{

Winges2011,

author={Winges, Johan},

title={Transport effects at control rod tips},

abstract={To analyse transport effects at the control rod tips in a nuclear reactor the more accurate
SP3 approximation for neutron transport is compared to the usually applied mulitigroup
diffusion equations. This has been done as a master thesis project at Studsvik
Scandpower, and a previously two-dimensional solution method for SP3 theory has been
generalised to three-dimensions and implemented in a independent code. Computations
for one- to three-dimensional systems have been done and the results given for diffusion
theory and SP3 theory compared.
The thesis work has indicated that there are possible differences between the diffusion
and SP3 solutions in an non-neglectable magnitude for computations in three-dimensions
but with generally no negative implications in regards to reactor safety and fuel pin integrity.
For the analysed partial cores the diffusion solution over estimated the power at
and around control rod tips with around 2-8 % compared to the SP3 solution. Further
studies will be necessary to show that this is the case in general as only a limited amount
of cases was analysed. This order of magnitude is relatively large in comparison to the
expected difference between diffusion theory and actual measurements in a real reactor.
These usually differ by no more than a few percent. The exact order of magnitude for
an actual nuclear reactor is not possible to determine with the partial cores and the code
developed. For this a more sophisticated code computing with or without SP3 for a complete
core would be necessary.
},

publisher={Institutionen för teknisk fysik, Nukleär teknik, Chalmers tekniska högskola},

place={Göteborg},

year={2011},

keywords={Neutron transport, Diffusion, SP3 theory, Control rod tips},

note={60},

}

** RefWorks **

RT Generic

SR Print

ID 146689

A1 Winges, Johan

T1 Transport effects at control rod tips

YR 2011

AB To analyse transport effects at the control rod tips in a nuclear reactor the more accurate
SP3 approximation for neutron transport is compared to the usually applied mulitigroup
diffusion equations. This has been done as a master thesis project at Studsvik
Scandpower, and a previously two-dimensional solution method for SP3 theory has been
generalised to three-dimensions and implemented in a independent code. Computations
for one- to three-dimensional systems have been done and the results given for diffusion
theory and SP3 theory compared.
The thesis work has indicated that there are possible differences between the diffusion
and SP3 solutions in an non-neglectable magnitude for computations in three-dimensions
but with generally no negative implications in regards to reactor safety and fuel pin integrity.
For the analysed partial cores the diffusion solution over estimated the power at
and around control rod tips with around 2-8 % compared to the SP3 solution. Further
studies will be necessary to show that this is the case in general as only a limited amount
of cases was analysed. This order of magnitude is relatively large in comparison to the
expected difference between diffusion theory and actual measurements in a real reactor.
These usually differ by no more than a few percent. The exact order of magnitude for
an actual nuclear reactor is not possible to determine with the partial cores and the code
developed. For this a more sophisticated code computing with or without SP3 for a complete
core would be necessary.

PB Institutionen för teknisk fysik, Nukleär teknik, Chalmers tekniska högskola,

LA eng

OL 30