Influence of TREAT nonprototypic effects on prediction of pin failure in LMFBRs Page: 4 of 12
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:
TABLE I
Comparison of LAFM Predictions and Experimental
Results for TOP TREAT Tests
Test
Test
Ramp
Rate
Observed
Failure
Time
(9)
Predicted
Failure
Time
(s)
Observed
Maximum
Strain
(X)
Predicted
Maximum
Strain
(%)
E6
3$/s
9.18
9.175
a
• • •
1.17
H4
50 Is
6.69
6.68
a
• • •
0.46
H6
50c/3
8.92
8.84
a
■ • •
0.23
HUT3-3A
3$/s
-
-
0.51
0.47
HUT3-5A
3$/s
-
-
0.08
0.06
HUT3-5B
3$/s
9.74
9.665
a
• ■ •
0.80
HUT5-3A
50c/s
8.95
8.81
a
0.20
HUT5-5A
50c/s
-
-
0.068
0.072
HUT5-5B
50c/s
11.00
11.08
a
• ■ ■
0.44
H0P3-1A
3$/s
-
-
0.00
0.03
HOP3-2A
3$/s
-
-
0.13
0.15
HOP3-2B
3$/s
-
-
0.30
0.26
aStrain could not be measured because of test pin destruction.
the axial midplane at a relative height of 'h 0.64 and 0.53, for the highl-
and intermediate-power pins respectively. In the latter two cases,
differential thermal expansion combined with fission gas pressurization to
cause cladding failure.
The relative importance of differential thermal expansion and in-
ternal pin pressurization can be seen quite clearly by calculating the
cladding life fraction (failure being defined Lo occur when the cladding
life fraction reached 1.0) at the nominal failure time while ignoring the
presence of fission gas in the pin. For the 3$/s transients, the life
fraction calculated in this manner is near zero, indicating that differ-
ential thermal expansion is unimportant. For the 50c/s transients, how-
ever, the calculated life fraction (when fission gas is ignored) is
sizable; 0.90 for the high-power pin and 0.60 for the intermediate-power
pin. These calculations are summarized in Table II.
The difference in failure characteristics between the 3$/s and 50c/s
FTR transients can be attributed to the more rapid fuel-melting rate in
the 3$/s transients. Although the calculations summarized above indicate
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.
Mast, P.K. & Scott, J.H. Influence of TREAT nonprototypic effects on prediction of pin failure in LMFBRs, article, January 1, 1979; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1095711/m1/4/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.