Preparation of computer codes for analyzing sensitivity coefficients of burnup characteristics, 2 (Contract research, Translated Document)

Hanaki, Hiroshi*; Sanda, Toshio*; Ohashi, Masahisa*

JAEA-Review 2008-047, 266 Pages, 2008/10

JAEA-Review-2008-047.pdf:62.06MB

It is thought to improve the prediction accuracy for burnup characteristics using many burnup data of "Joyo" effectively. It is thought the best way to adjust cross-sections using sensitivity coefficients of burnup characteristics to utilize burnup data of "Joyo". Therefore in this work computer codes for analyzing sensitivity coefficients of burnup characteristics had been prepared since 1992. The results are as follows: (1) The computer codes which could analyze sensitivity coefficients of burnup characteristics taking into consideration plural cycles and refueling were prepared, therefore it came to be able to adjust cross-sections using burnup data and to estimate the accuracy for design of large LMFBR cores. (2) The adequacy of prepared codes was made sure by comparing with direct calculations. (NB: This document is a translation of PNC TJ9124 94-007 Vol.2 published in March 1997.)

Preparation of computer codes for analyzing sensitivity coefficients of burnup characteristics(II)

*; Sanda, Toshio*; *

PNC TJ9124 94-007, 723 Pages, 1994/03

PNC-TJ9124-94-007-Vol1.pdf:22.78MB
PNC-TJ9124-94-007-Vol2.pdf:13.26MB

To develop nuclear design of LMFBR cores, they are important subjects of research and development to improve the accuracy in nuclear design of large LMFBR cores and to design highly efficient core more rationally. The adjusted nuclear cross-section library has beeen made by being reflected the result of critical experiment of the JUPITER, etc. effectively as much as possible. And the distinct improvement of the accuracy in nuclear design of large LMFBR cores has been achieved. In the design of large LMFBR cores, however, it is important to accurately estimate not only nuclear characteristics, for example, reaction rate distribution and control rod worth but also burnup characteristics, for example, burnup reactivity loss, breeding ratio and so on. Therefore, it is thought to improve the prediction accuracy for burnup characteristics using many burnup data of "JOYO" effectively. It is thought the best way to adjust cross-sections using sensitivity coefficients of burnup characteristics to utilize burnup data of "JOYO". It is able to know the accuracy quantitatively for burnup characteristics of large LMFBR by analyzing the sensitivity coefficients. Therefore in this work computer codes for analyzing sensitivity coefficients of burnup characteristics had been prepared since 1992. In 1992 cross-sections adjustment was done by using the data of "JOYO" and the effect was studied. In this year the adequacy of the codes was studied with a view of applying to design of large LMFBR cores. The results are as follows: (1)The computer codes which could analyze sensitivity coefficients of burnup characteristics taking into consideration plural cycles and refueling were prepared, therefore it came to be able to adjust cross-section using burnup data and to estimate the accuracy for design of large LMFBR cores. The characteristics are not only burnup reactivity loss, breeding ratio but also number density, criticality, reactivity worth, reaction rate ratio, and ....

Improwement of a three dimensional core deformation analysis code

Sawada, Shusaku*; *; *

PNC TJ9124 88-007, 173 Pages, 1988/05

PNC-TJ9124-88-007.pdf:5.13MB

Following functions have been added to HIBEACON which is a three dimensional core deformation analysis code for experimental fast reactor "JOYO", in order to improve the functions for evaluation of core deformation behavior and calculational accuracy of the code. (1)Calculational model for frictional force at contact points between wrappers. (2)Function to assign swelling and creeping equations to each core element's type. The Characteristics of this code are as follows, (i)Sliding events and sticking events in the frictional phenomenon can be calculated with HIBEACON's characteristic being kept, which is to decompose a core element's displacement into components in three directions. (ii)It's supposed that a sliding event proceeds in quasi-static and a static frictional force at end of a sliding event is equal to a dynamic frictional force just before the end. (iii)The frictional force at a sticking event can be treated as an internal force in a contact point with the condition that there is no relative displacement between two assemblies which contact each other through a sticking contact point. (iv)Damping method is adopted at the process of frictional force calculation in order to stabilize a solution of frictional force in sliding event. (v)A calculational method of repetition is adopted at the process of frictional force calculation. The results during repetition can be obtained in the form of output lists and plotter at option. (vi)Swelling and creeping equations can be assigned to each core element's type and the maximum number of core element's types has been increased from six to fifteen. (vii)Core deformation behavior at several points of the process of power descent can be calculated as well as the process of power ascent. The example-4, which is one of the benchmark problems submitted by IAEA/IWGFR, is calculated with this modified code. Following results on the influence of friction to deformation behavior has been obtained, (i)The ...

None

Nakajima, Ichiro; *; *

Hitachi Hyoron, 67(11), 909 Pages,