ML041410132

E-mail Dated 04/27/04 ANO 1 Slides for NRC Conference Call on 04/27/04

ML041410132
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Site:	Arkansas Nuclear
Issue date:	04/27/2004
From:	Davant G Entergy Operations
To:	Alexion T NRC/NRR/DLPM/LPD4
Alexion T W, NRR/DLPM, 415-1326
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Jhomas Alexion - FW: Slides for NRC Conference Call on April 27, 2004 Page_1 11 Thoms Aexin-W: Side fo.NR Cofrec Ca on Ap1 27, 200 Pa I

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'DAVANT, GUY H" <GDAVANT@ entergy.com>

"'twa~nrc.gov"' <twa~nrc.gov>

4/27/04 12:06PM FW: Slides for NRC Conference Call on April 27, 2004

Tom, Attached are notes we will be discussing during the 1:00 call today. You may docket these.

Thanks!

Guy

> <<<SIA EPFM NRC CONF 4-27-04.pdf>>

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FW: Slides for NRC Conference Call on April 27, 2004 4/27/04 11:59AM "DAVANT, GUY H" <GDAVANT@entergy.com>

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Response to NRC Questions

1. Upper shelf Charpy V-notch energy (USE) estimates for the ANO-1 head material were developed as shown in Figure 4, This Figure indicates three Charpy energy data points derived from measurements on the ANO-1 head material at +100 F. The actual measurements were higher, but they were measured in the Longitudinal direction, so they were reduced for the Transverse direction in accordance with USNRC SRP/NUREG-75/087 MTEB 5-2 Position 1.1 B-3a. These are obviously not on the upper shelf, so they have been plotted on a complete Charpy Energy plot for a comparable material (GGNS beltline plate, comparable thickness, Transverse direction). The three ANO points fall well within the range of the GGNS data at +100F, and therefore, the GGNS data, which exhibit USEs ranging from 94 to 120 ft-lbs, are considered representative of the ANO-1 head material USE. The lower bound value of 94 ft-lbs was used, in conjunction with J-T versus Charpy USE correlations in NUREG-0744 (Figures 2 and 3), to estimate a conservative J-T curve for the analysis.

2. The screening criteria of Appendix H were developed using the "Fracture Analysis Diagram" (FAD) approach.

Although Appendix H itself is strictly applicable only to ferritic piping, the FAD approach upon which it is based is more generally applicable. A second criterion for the applicability of J-T stability analysis to ferritic materials is that the temperature be at least 500F greater than the onset of upper shelf. From Figure 4, it is seen that onset of upper shelf occurs at about 2100F. Since the ANO-1 evaluation is at operating temperature of -5501F, it clearly meets the latter criterion as well.

Response to NRC Questions (continued)

3. The Appendix K approximation for J-integral requires that the plastic zone size be small (i.e. contained plasticity).

The plastic zone size with the recommended safety factors (SF=3 on primary loads, 1.5 on secondary) is 0.319",

which is considered small in comparison to the original crack size of -1.5" and the nominal head thickness of 6.6".

The plastic zone sizes become significantly greater for the higher safety factor cases (0.5" to 2"), but these are just informational cases to demonstrate margin, and not the focal point of the analysis. Also, since the dominant loading in these analyses is residual stress (amplified by safety factors), which is strain controlled and highly localized, the approximation of using LEFM K-values to estimate EPFM J-values remains valid for much larger plastic zone sizes than might be interpreted from Appendix K.

4. The analysis demonstrates large margins between applied J-integral and the crack instability point (i.e. the point where the applied J-T line intersects the appropriate J-T material curve) in all cases. In Figure 6, it is seen that the applied J-T point for the recommended safety factors of 3 on primary loads and 1.5 on secondary (residual) loads is below even the 40 ft-lb J-T material curve, which was measured at +10 for the ANO-1 head material, and is an extreme lower bound of USE for this material. Considering a more reasonable estimate of J-T material for the ANO-head material on the upper shelf (the 94 ft-lb curve - still a lower bound) shows ample margin to instability, and even supports application of the full safety factor of 3 on both primary and secondary (residual) loads.

8 58 189 158 289 T mat Figure 1: J-T Diagram for Several Reactor Vessel Steels and Welds Showing Rough Correlation with Charpy V-notch Upper Shelf Energy [5J. Power Law Correlations used for ANO-1 Head (40 and 94 ft-lbs) also Shown

(

15 10

• a150/_

170 C

o 200 o3 20 5

SS 00 0.0, 0.4 0.8 1.2 1.6 2.0 CVN/100t+ l6>

Figure 2: Correlation of Coefficient C of Power Law J R-curve Representation with Charpy V-notch Upper Shelf Energy [51

0.7.

0.6 0

0.5 o05*

o 04 Y

EQ-so---O-

.0.4 o

00 m

1.

1.61T-CT 043 0.2z 0.1

• 0 L..

~

0

2.

4 6

8 ic X=C+1.5( O.'

12 14 16 Figure 3: Correlation of Exponent m of Power Law J R-curve Representation with Coefficient C and Flow Stress cs 151

130 120 110 1-In

.04--

cm il-arw

'a

-D-0 o

Vn

.0 0.

co DC-,

100 90 80 70 60 50 40 30 USE Mean 106 ft-ibs

_..e 7~

7 7

/

i

-/-

7."-"'

/-'

Lowest USE 94 ft-lbs USE LC L98 Ft-lbs..

.i AND-I RVH Charpy Data' Cmparison.,

-wit GGNS BatinPlate Data to estals S

(Fourth Order polynomnial fit With 99% confidence bounds) h-GG NS RV Beitline Plates (transverse CVN) 4-plates ANO-1 RVH (CVN at +10F) using MTEB 5-2; B-1.1-3a I,

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tI..,..I I.; s2^.............. ' w.;-

20 10 0

-110 -90

-70

-50

-30

-10 10 30 50 70 90 111 Test Temperature {Deg. F) 0 130 150 170 190 210 230 Figure 4. GGNS RV Plate (beltline) data (Lukens Steel A533 Gr. B Cl. 1) from transverse Charpy V-notch test. ANO-1 data from FSAR Table 4-16, @

+10 F Longitudinal. Converted to Transverse using USNRC SRP/NUREG-75/087 MTEB 5-2 Position 1.1 B-3a.

J J

haSLOPE dA Aa I

INSTABILITY ---

MATERIAL 7--

I APPLIED T =

-()

93220rO Figure 5-Schematic of EPFM Stability Analysis from ASME XI, Appendix K 141

12 10 a..

a -A 2 ;.._.'.'.........

0 0

20 40 60 80 Tearing Modulus 100 120 140 Figure 6-Results of EPFM Stability Analysis for ANO-1 Top Head Remnant Cracking Concern

Table 1: J-T Computations for ANO-1 Top Head Remnant Crack (postulated) using ASME Section XI Appendix K Approximate Method

-:Safety KID I K-1.

-Ktot I

rD I

"a 0

'l(a a),

'K'totat:

Factor ksi in,,-

inches. -____

__lkin:

SF=1 3.7 90.7 94.4 0.131 1.631 1.043 98.4 SF=3,1.5 11.1 136.1 147.2 0.319 1.819 1.101 162.0 SF=2 7.4 181.4 188.8 0.525 2.025 1.162 219.4 SF=3 11.1 272.1 283.2 1.182 2.682 1.337 378.7 SF=3.5 13.0 317.5 330.4 1.609 3.109 1.440 475.6 SF=4 14.8 362.8 377.6 2.101 3.601 1.549 585.1 I

ksi i n-kips/in ;

In-kips/i.

SF=1 3.7 90.7 94.4 98.4 0.294 0.916 0.046 SF-3, 1.5 11.1 136.1 147.2 162.0 0.797 2.483 0.124 SF=2 7.4 181.4 188.8 219.4 1.460 4.551 0.228 SF=3 11.1 272.1 283.2 378.7 4.350 13.559 0.678 SF=3.5 13.0 317.5 330.4 475.6 6.863 21.392 1.070 SF=4 14.8 362.8 377.6 585.1 10.383 32.367 1.618