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The use of routine cell codes for evaluating the In-rod effective cross sections of resonance absorber

Abstract

The last three years have witnessed an increasing interest in the in-rod distribution of resonance absorption and of temperature. High burnup, especially beyond the `classical` limit of 30 GWd/T, is expected to generate uneven in-rod isotope distributions with consequences for fuel rod integrity and reactor Doppler feedback. There are recent indications that, even for a freshly loaded uranium-oxide rod, proper account of the U{sup 238} in-rod absorption rate distribution results in a doppler coefficient some 15% lower in magnitude than its routinely calculated value. Presently a special form of application is made of the Bogart approach. This approach is based on the fact that, as a fuel rod is filled in from the outside, its resonance capture rate increases monotonically, despite file decreasing effective capture cross section for the thickness annulus. Bogart used His observation to derive a differential equation for the in-rod absorption distribution. Presently we capitalize on the idea in a discrete form. (author).
Authors:
Segev, M [1] 
  1. Ben-Gurion Univ. of the Negev, Beersheba (Israel). Dept. of Nuclear Engineering
Publication Date:
Dec 01, 1996
Product Type:
Conference
Report Number:
INIS-mf-15507; CONF-961252-
Reference Number:
SCA: 220100; PA: AIX-28:023670; EDB-97:072414; SN: 97001788818
Resource Relation:
Conference: 19. conference of the Israel Nuclear Societies, Herzliya (Israel), 9-10 Dec 1996; Other Information: PBD: Dec 1996; Related Information: Is Part Of Program and book of abstracts; PB: 149 p.
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; RESONANCE ABSORPTION; CROSS SECTIONS; COMPUTERIZED SIMULATION; ENERGY YIELD; NEUTRON ABSORBERS; REACTOR CELLS; REACTOR LATTICES; REGULATING RODS
OSTI ID:
475943
Research Organizations:
Israel Nuclear Society, Yavne (Israel)
Country of Origin:
Israel
Language:
English
Other Identifying Numbers:
Other: ON: DE97616259; TRN: IL9606171023670
Availability:
INIS; OSTI as DE97616259
Submitting Site:
INIS
Size:
pp. 1-3
Announcement Date:
Jun 10, 1997

Citation Formats

Segev, M. The use of routine cell codes for evaluating the In-rod effective cross sections of resonance absorber. Israel: N. p., 1996. Web.
Segev, M. The use of routine cell codes for evaluating the In-rod effective cross sections of resonance absorber. Israel.
Segev, M. 1996. "The use of routine cell codes for evaluating the In-rod effective cross sections of resonance absorber." Israel.
@misc{etde_475943,
title = {The use of routine cell codes for evaluating the In-rod effective cross sections of resonance absorber}
author = {Segev, M}
abstractNote = {The last three years have witnessed an increasing interest in the in-rod distribution of resonance absorption and of temperature. High burnup, especially beyond the `classical` limit of 30 GWd/T, is expected to generate uneven in-rod isotope distributions with consequences for fuel rod integrity and reactor Doppler feedback. There are recent indications that, even for a freshly loaded uranium-oxide rod, proper account of the U{sup 238} in-rod absorption rate distribution results in a doppler coefficient some 15% lower in magnitude than its routinely calculated value. Presently a special form of application is made of the Bogart approach. This approach is based on the fact that, as a fuel rod is filled in from the outside, its resonance capture rate increases monotonically, despite file decreasing effective capture cross section for the thickness annulus. Bogart used His observation to derive a differential equation for the in-rod absorption distribution. Presently we capitalize on the idea in a discrete form. (author).}
place = {Israel}
year = {1996}
month = {Dec}
}