Contain direct containment heating calculations for the Zion plant: A preliminary study Page: 2 of 8
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
-2-
to lead to pressure loads which might exceed the structural capacity of some
containment buildings.
A series of CONTAIN calculations to predict the DCH loading for the Zion
plant have been performed in support of the containment experts panel activi-
ties for updating the Draft NUREG-1150.1 The CONTAIN code Version 1.10,2
which includes an Interim DCH Model, was used. Calculations were performed
using a seven cell model of the Zion containment. Since CONTAIN is a lumped
parameter code and not a detailed fluid dynamics code, it cannot be expected
to model all the DCH phenomena mechanistically. Therefore, it was necessary
to perform calculations with a "range" of input parameters to study the effect
of various processes on the containment pressurization. The selection of
parameters and associated ranges were based on the results of recent experi-
ments. The parameters that were varied are: the melt and steam flowrates
through the reactor cavity, melt droplet size, melt trapping rate, hydrogen
combustion, quenching of trapped debris, and primary system pressure at vessel
failure. In addition, calculations were performed for three values of assumed
initial melt inventory. To assess the degree of conservatism implicit in the
CONTAIN seven cell calculations, adiabatic single cell DCH calculations (the
most conservative calculation) were also performed.
Figure 1 shows a partial summary of the results of the calculations. The
calculated containment pressure rise due to DCH is plotted against the frac-
tion of melt inventory exiting the reactor pressure vessel. The solid and the
dotted lines represent the results of single-cell adiabatic equilibrium calcu-
lations from a stand alone BNL single-cell code (EBAL) and CONTAIN, respec-
tively. The seven-cell CONTAIN calculations shown (long dashed line) indicate
a pressure rise of approximately half that of the single cell adiabatic case.
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Tutu, N.; Park, C.; Grimshaw, C. & Ginsberg, T. Contain direct containment heating calculations for the Zion plant: A preliminary study, article, January 1, 1988; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1111202/m1/2/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.