ML20245H627
| ML20245H627 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 02/28/1989 |
| From: | Antaki G, Coslow B, Palusamy S WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20011C570 | List: |
| References | |
| WCAP-12094-S01, WCAP-12094-S1, NUDOCS 8903020440 | |
| Download: ML20245H627 (9) | |
Text
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Westinghouse Class 3 WCAP-12094 Supplement 1 ADDITIONAL INFORMATION IN SUPPORT OF THE EVALUATION OF THERMAL STRATIFICATION FOR THE BEAVER VALLEY UNIT 2 PRESSURIZER SURGE LINE l
l F. J. Witt February 1989 Verified by:
B.Jfoslow Approved by:
W. d ' Approved by:
/~ u m 5m G. A. Antaki, MprJ6ger
/ S'. 5. Palusamyg Manager Systems Struct #al Analysis Structural Materials Engineering WESTINGHOUSE ELECTRIC CORPORATION Nuclear and Advanced Technology Division P.O. Box 2728 Pittsburgh, Pennsylvania 15230-2728 m.-cuses to i'i f
8903020440 890224 PDR ADOCK 05000412 P
PDR L
1
1.0 INTRODUCTION
In WCAP-12093 (reference 1) the surge line of the Beaver Valley Unit 2 nuclear plant was evaluated for thermal stratification. The major conclusion was that thermal stratification has limited impact on the integrity of the pressurizer surge line of the Beaver Valley Unit 2 nuclear power plant and that the forty year design life is not impacted.
The reevaluation of leak-before-break for the surge line demonstrated large margins for all the stratification scenarios considered. Of specific interest was the faulted condition, case F, representing a [
Ja,c.e Duquesne Light Company requested that, in the leak-Defore-break analyses, additional calculations be provided for the [
]0 and for stable flaw
~
sizes for information purposes. This additional information is provided below. A familiarity with section 5.0 of reference 1 is assumed in the discussion.
2.0 ADDITIONAL INFORMATION The additional calculations for [
Ja,c.e were very conservatively made by assuming the [
Ja c.e The loads for this condition at the critical location Node 171 are given in table 1(a). This loading case is designated case FF. The corresponding leak-before-break cases are designated A/FF and B/FF. The temperatures and flaw sizes considered in the leak-before-break analyses are given in table 1(b). The J integral results are given in table 1(c). Large margins are still seen to exist even for this extreme condition.
Additional margins on flaw sizes were established by plotting the applied J versus crack length up to the maximum J value of [
Ja,c.e for the mi,-erim io 1
.g five LBB cases reported in reference 1, replacing cases A/F and B/F with A/FF and B/FF, respectively. The results are plotted in figures 1 through 4.
Much larger marging than the factor of 2 are demonstrated.
References:
1.
R. L. Brice-Nash et al., Evaluation of Thermal Stratification for the Beaver Valley Unit 2 Pressurizer Surge Line, WCAP-12093, December 1988
'i (Westinghouse Proprietary Class 2).
C' 4
e t
i Fe Ks?,-cr1we 90 2
Table 1.
Summary of Results Table 1(a) Loads and Stresses For Case FF Force Stress Moment Stress Total Node F (1bs) op (psi)
N-(in-lbs)'
og(psi) Stress (psi)
- a,c.e 171
. Table 1(b) Temperature and Leakage Flaw Sizes for LBB Cases A/FF and B/FF at Node 171 Temperature (*F)
Leakage Case Leak Rate Stability Flaw (in.)
a,c.e A/FF B/FF Table 1(c) J-Integral Results for LBB Cases A/FF and B/FF Criteria Crack J
J O
Ic max Length app Case (in-lb/in )
mat (in-lb/in)
(in)
(in-lb/in )
T,pp 2
T 2
2
_ a,c.e A/FF B/FF N.A. - not applicable, J,pp < JIc o
m,-mu in 3
,I 4
o a,c.e Figure 1.
J,pp Versus Flaw Size For Case A/D, Node 196 me, im to 4
'f O
a,c.e l
Figure 2.
J,pp Versus Flaw Size For Case B/E, Node 196 5
J
9 ;..
9 a,c e Figure 3.
J Versus Flaw Size For Cases A/FF and B/FF, Node 171 i
6
. 1,
\\
p
l:
l l
t 1
(;
s a,c.e
/:
(>
t)
/
Figure 4.
J Versus Flaw Size For Case C/G, Node 171 mov.-onm u 7
s