NG-03-0577, Evaluation of Indication in Dollar Weld HCC-B002
| ML032310478 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 08/07/2003 |
| From: | Peifer M Nuclear Management Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NG-03-0577 | |
| Download: ML032310478 (23) | |
Text
NMac Committed to Nuclear Excelleng~ Duane Arnold Energy Center Operated by Nuclear Management Company, LLC August 7, 2003 NG-03-0577 10 CFR 50.55a Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station 0-Pl-17 Washington, DC 20555-0001 DUANE ARNOLD ENERGY CENTER DOCKET 50-331 LICENSE No. DPR-49
SUBJECT:
Evaluation of Indication in Dollar Weld HCC-B002 REFERENCE 1: NG-01 -0601, Letter dated May 2, 2001, K. Putnam (NMC) to NRC REFERENCE 2: NG-01-0975, Letter dated August 15, 2001, K. Putnam (NMC) to NRC In April of 2001, during refueling outage (RFO) 17, weld inspections were performed at the Duane Arnold Energy Center (DAEC) in accordance with the DAEC Inservice Inspection (ISI) Program. As discussed in Reference 1, those inspections identified an indication in a circumferential weld in the reactor head (Vessel Head Dollar Weld HCC-B002) that did not meet ASME Section Xl IWB-3500 acceptance standards. The indication was evaluated and determined to be acceptable to leave as-is.
The Inservice Inspection Summary Report that was submitted to the NRC (Reference
- 2) referred to the evaluation, but did not include it for the Staff's review. Submittal of the evaluation to the NRC is required by IWB-3134. Nuclear Management Company, LLC therefore submits the evaluation by this letter (Attachment).
This letter contains no new commitments.
Sincerely, Mark A. ifer Site Vice President, Duane Arnold Energy Center Attachment CC. Regional Administrator, USNRC, Region IlIl Project Manager (DAEC)
NRC Resident Inspector (DAEC) uQ-7 3277 DAEC Road
- Palo, Iowa 52324-9785 Telephone: 319.851.7611
K Attachment to NG-03-0577 Indication in HCC-B002 Summary A subsurface indication was identified in a circumferential weld in the reactor head (Vessel Head Dollar Weld HCC-B002). A sketch of the indication is provided in this attachment.
The indication in HCC-B002 was evaluated using the Duane Arnold Reactor Pressure Vessel Flaw Evaluation Handbook (SASR 9144, DRF 137-0010, issued July 1991). The flaw acceptance diagrams contained in the Handbook were developed in accordance with Section Xl of the ASME Code (1989). The flaw was determined to be acceptable to leave as is. Completed evaluation worksheets are included in this attachment, along with supporting pages of the Handbook.
An input to the acceptable flaw size is the hydro-test temperature that is determined from the Duane Arnold Energy Center Pressure-Temperature Curves. Since these curves were revised by Amendment 238 (dated April 30, 2001), the flaw acceptance criteria contained in the Handbook required re-evaluation. This re-evaluation is documented in a letter dated May 3, 2001 (enclosed). The allowable flaw size changed from 1.2" to 1.19". As seen in the enclosed evaluation, the size of the indication in HCC-1002 is well below this revised acceptance criteria, and remains acceptable to leave as is.
Duane Arnold Reactor Pressure Vessel Flaw Evaluation Handbook Pages 2-5 9 Pages 2 2-13 Pages 3 3-3
SASR 91-44 DRF 137-0010 2.4 CLASSIFY FLAW Classify the flaw according to Figure 2.4 and the descriptions below. Record the flaw category on step 4 of the worksheet.
Class Description A An inside surface flaw contained entirely within the cladding.
B An inside surface flaw which extends beyond the cladding (if
,present) into the low alloy steel.
C A subsurface flaw which is analyzed as a surface flaw per step 3d above due to close proximity to the inside surface (S < 0.4d1 ).
D An outside surface flaw.
E A subsurface flaw which is analyzed as a surface flaw per step 3d above due to close proximity to the outside surface (S < 0.4d1 ).
F A subsurface flaw remote from the surface according to step 3d above (S a 0.4 d ).
2.5 SIZE FLAW The flaw dimensions are next recorded on step 5 of the worksheet as follows:
a-e) For Class 'Al through "EN flaws (flaws considered as surface flaws),
record the surface flaw depth, lb', (excluding the cladding) to be considered after combining the flaws due to proximity to other flaws -or the surface. Also, record the surface flaw length , 'I', to be considered.
f) For a Class OF' (subsurface) flaw, record the measured or combined sub-surface flaw depth, l2d'. Also record the measured or combined length, 'I', and the distance to the surface, 'S'.
DA FLEV.WP 2-5 Date Lmued July 1,1991 NEDC-31980
SASR 91-44 DRF 137-0010 2.6 CALCULATE NON-DIMENSIONAL PARAMETERS The following non-dimensional parameters are to be calculated for each flaw:
a-e) For Class "A" through "E" flaws, the flaw depth (b/t) and flaw aspect (b/A) ratios are to be calculated and recorded on step 6 of the worksheet. If the calculated flaw aspect ratio exceeds 0.5, set it equal to 0.5.
f) For Class OF' flaws, the flaw depth (d/t) and flaw aspect (d/i) ratios are to be calculated and recorded on step 6 of the worksheet. The flaw-to-surface proximity factor, Y - (S/d) must also be calculated and recorded on step 6. If this value exceeds 1.0, set it equal to 1.0.
2.7 IWB-3500 FLAW EVALUATION The detected flaw is now to be evaluated in accordance with paragraph IWB-3500 of the ASHE code,Section XI.
a) Class "Al flaws (contained entirely within the cladding) are automatically acceptable according to IWB-3510.ld. Check acceptable on step 7 of the worksheet and no further analysis is required.
b-e) For Class "B" through "E" flaws plot the flaw aspect (b/1) and flaw depth (b/t) ratios on Figure 2.5 and record the allowable (b/t) ratio for the given flaw aspect ratio. If the plotted point falls below the IWB-3500 acceptance limit, check acceptable on step 7 of the worksheet. No further analysis is required for this flaw. If the flaw exceeds the limit, check unacceptable on the worksheet and continue to step 8.
f) For Class OF" flaws plot the flaw aspect (d/X) ratio and the flaw depth (d/t) ratio on Figure 2.6. Find the correct curve and allowable (d/t) value for the surface proximity factor, Y, recorded on step 6 of the worksheet. If the plotted point falls below the IWB-3500 acceptance DAFLEV.WP Datei ssud: July 1,1991 2-6 NEDC-31980
SASR 91-44 DRF 137-0010 limit for the correct Y value, check acceptable on step 7 of the worksheet. No further analysis is required for this flaw. If the point exceeds the limit, check unacceptable on the worksheet and continue to step 8.
2.8 CALCULATE FLAW DEPTH INCLUDING CLADDING To compare the flaw against IWB-3600 limits, the flaw dimensions including the cladding are to be determined.
b&c) For Class "B" and "C" flaws, add the cladding depth, 'c', to the surface flaw depth, 'b', to obtain the total surface flaw depth, a - b+c, and record on the worksheet, step 8. Also, calculate and record the new flaw aspect (a/1) ratio using 'I' from step 5 If the calculated value for (a/X) exceeds 0.5, record the value as 0.5.
d&e) For Class "Du and "E" flaws, the flaw depth, 'a', is set equal to the original flaw depth, 'b', since the flaw is not located on or near a clad vessel surface. Record the values of 'a' and '(a/l) on step 8 equal to
'b' and '(b/A) from step 5. The flaw aspect (a/X) ratio shall be limited to a maximum of 0.5.
f) For Class "FT flaws, the subsurface flaw depth, '2d', and flaw aspect ratio, (d/l), are already recorded on steps 5 and 6.
2.9 IWB-3600 FLAW EVALUATION Flaws which did not pass the IWB-3500 acceptance limits are now to be evaluated against the IWB-3600 limits developed for Duane Arnold. Using the flaw classification, region and orientation, determine the correct flaw acceptance figure to use from Table 3.1 of Section 3. Record the correct figure number on step 9 of the worksheet.
DA FLEV.WP 2-7 Date Issued: July 1,1991 NEDC-31980
SASR 91-44 DRF 137-0010 b) For Class B flaws, the most limiting curve which can be met (0, 5, 10 or 20 years), if any, shall be recorded. The allowable flaw depth, aall, for this curve shall be recorded for the flaw aspect ratio of the flaw.
c-e) Record the allowable flaw depth, aall for the aspect ratio of the flaw.
f) Record the allowable flaw depth, 2 dall for the flaw.
If the flaw meets the IWB-3600 limits, check the box for "Acceptable per IWB-3600". For acceptable Class B flaws, also record which criteria is met (0, 5, 10 or 20 years. Future monitoring of these flaws which exceed IWB-3500 and are found acceptable by IWB-3600 is required to verify that significant growth does not occur.
If the flaw is not acceptable, check the box for "Unacceptable per IWB-3600" and continue to step 10 to investigate further analysis which may be done to show compliance to IWB-3600.
2.10 FURTHER EVALUATION If a flaw can not be shown to be acceptable according to the flaw acceptance diagrams given in this report, it is possible that a flaw-specific analysis can be completed to show acceptance of this flaw with no repair. Because this analysis considers most of the Duane Arnold vessel, some conservative assumptions were made to make the results bounding for various regions of the vessel. Some conservative assumptions which were made in the IWB-3600 fracture analysis include:
- 1) The most limiting (highest) RTNDT for any material within a region is assumed for the entire region.
- 2) Cladding stresses are included, even for the outside surface of the vessel and for subsurface flaws.
DA-FLEV.WP 2-8 Date Iued: Julyl, 1991 NEDC -31980
SASR 91-44 DRF 137-0010
- 3) Minimum design wall thicknesses are used rather than 'as-built" wall thicknesses.
- 4) The largest bending stresses for the vessel closure flange regions (9 and 10) are assumed to occur over the entire region. Also, the flange region stresses used are for 1250 psig pressure rather than the actual hydrotest pressure of 1100 psig.
Although these assumptions do not add much conservatism to the analysis in most cases, a flaw-specific analysis should first be conducted to eliminate these conservatisms and attempt gain acceptance for the flaw. Another possible alternative may be to increase the hydrotest temperature. This will increase the material toughness during the most severe loading in terms of fracture and increase the allowable flaw depths. The flaw acceptance diagrams for regions 4 and 5 already show the effect for an increased hydrotest temperature.
If the local stress limit (1/3 thickness) region of the acceptance curve is exceeded (the flat portion of the curve) the assumptions made above will not affect the flaw depth limit. For this case, a finite element analysis will likely be able to show additional margin.
If a flaw-specific analysis is not able to resolve the detected flaw, the flaw may have to be ground out or in extreme situations weld repaired.
DAFLEV.WP 2-9 DateIssued: Julyl, 1991 NEDC-31980
SASR 91-44 DRF 137-0010 Head Dollarr Region 12 7 Headi Toru\ Region 1 1 I J~~~~~~~~~~
Region 10 Head jFianae Region 9 a
- a S S
a Region 13 includes
- I! a
- I a S
region A shown on
- S a
Shell 1I Ring 4 Region 8 Figure 2.2 for a
- I S Nozzles N1-N5, N8,
- I a
- I a o I a
- I N9, Nil & N16 S S
- a a S
- F
- a Region 14 includes Sh ellRing 3:
Region 7 region A shown on
- I aa Figure 2.2 for
- U
- I S I S Nozzles N6 & N7
- j S a _______ j _______ a
- a
- a Region 6
- I Region 15 includes
- a SheIIRing 2 :i region A shown on Vessel Figure BeItline ! : : £ Region 5 2.2 for Nozzles N10 & N12 Region I: :1
- 1 I: Region 4
- I
- I a ShelljRing 1 Region 3 a
- I a
- I - a
- I
- I I
I Bottom Torus '. Region 2
% ottom Dollar,.'
Region 1 I
DAVES3.DRW Figure 2.3 - Vessel Regions Considered in Handbook DA FLEV. WP 2-12 Date Issued: July 1, 1991 NEDC-31980
SASR 91-44 DRF 137-0010 Vessel Flaw Classifications
, Outside Surface Class ['Fl
-Class "D" a=b S
0.4d )
Class "E"
_t CL t -1 CLASS.DRW Figure 2.4 - Vessel Flaw Classifications DAFLEV . WP 2-13 Date Iaued: July 1, 1991 NEDC-31980
SASR 91-44 DRF 137-0010 SECTION 3 FLAW ACCEPTANCE DIAGRAMS This section contains the flaw acceptance diagrams developed in accordance with section IWB-3600 of the ASME code,Section XI. An example flaw acceptance diagram is shown on Figure 3.1. In order to prevent excessive local stresses in the vessel wall, the allowable flaw depths are also limited to 1/3 of the wall thickness, even when larger flaws can be justified per IWB-3600. The IWB-3500 limits shown for the class B and C acceptance diagrams are given for comparison purposes only. These figures are not to be used for IWB-3500 evaluations, the Figure 2.5 and 2.6 diagrams are more accurate figures used for this purpose. Table 3.1 lists the correct flaw acceptance diagram for each region.
Class B flaw depths are limited to the IWB-3600 criteria or to the depth equal to 1/3 of the low alloy steel wall thickness plus the cladding thickness. For Class B flaws penetrating the inside surface of the vessel, environmentally -
assisted fatigue crack growth can be significant. For this reason, the flaw acceptance curves show limits for various periods of time. If the Class B flaw depth plotted on the acceptance diagram is below the "0 year" line, the present flaw depth is acceptable. However, with fatigue crack growth, the flaw could exceed acceptance standards after a certain period of time. If the flaw is below the 1O year' line, the flaw is projected to be acceptable for a period of at least 10 years including conservatively predicted fatigue crack growth.
Class C flaws are limited to the same "0 year" acceptance curves as the Class B flaws. However, fatigue crack growth is not significant for these subsurface flaws isolated from the reactor environment. Therefore, Class C flaws meeting the acceptance criteria will be acceptable indefinitely.
Class D and E flaws are limited to the IWB-3600 criteria or to 1/3 of the low alloy steel wall thickness. For these outside surface flaws or subsurface flaws close to the surface, fatigue crack growth is insignificant.
DAFLEV.WP 3-1 Date ssued: Jly 1,1991 NE3DC-31980
SASR 91-44 DRF 137-0010 The stress intensity for a class F subsurface flaw is equal to the stress intensity for a surface flaw with one-half the flaw depth and equal applied stresses. Because of this, the IWB-3600 allowable flaw depths for a subsurface flaw of depth, '2d', are twice the limits for a surface flaw of depth, 'a'.
The subsurface flaw depth is still limited to 1/3 of the vessel low alloy steel wall thickness to prevent excessive local stresses.
The acceptance diagrams given for the beltline regions (Regions 4 and 5) were developed for the present (12 EFPY) hydrotest temperature of 195'F and the present predicted RTNDT shifts. Additional analyses were also done assuming a 10F increase in the hydrotest temperature to show the benefit to be gained by this temperature increase.
i DA-FLEV.WP 3-2 Datcsued: July 1,1991 NEDC-31980
SASR 91-44 DRF 137-0010 Table 3.1 - Flaw Acceptance Diagrams to be used for each Region Flaw Acceptance Diagram FigureA Region Orientation Flaw Class B&C Flaw Class D.E&F 1 N/A 3.2 3.3 2 N/A 3.4 3.5 3 Horiz. 3.6 3.7 Vertical 3.8 3.9 4 Horiz. 3.10 3.11 Vertical 3.12 3.13 5 Horiz. 3.14 3.15 Vertical 3.16 3.17 6 Horiz. 3.18 3.19 Vertical 3.20 3.21 7 Horiz. 3.22 3.23 Vertical 3.24 3.25
! 8 Horiz. 3.26 3.27 Vertical 3.28 3.29 9 Horiz. 3.30 3.31 Vertical 3.32 3.33 10 Horiz. 3.34 3.35 Vertical 3.36 3.37 11 N/A 3.38 3.39 12 N/A 3.40 3.41 13 N/A 3.42 3.43 14 N/A 3.44 3.45 15 N/A 3.46 3.47 DA-FLEV . WP 3-3 Date Issued: July 1, 1991 NEDC-31980
Sketch of Indication (One Page)
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Flaw Evaluation (Four Pages)
SASR 91.44 DRF 137-0010 Table 2.1 - Duane Arnold Flaw Evaluation Worksheet Flaw ID: V4 S-CX>
- 1) Determine Region and Orientation of Flaw. Region: l2.
Orientation: it
- 2) Sketch the Flaw Geometry. The flaw sketch is attached on the following I sheet. The cladding and low alloy steel thicknesses are:
II Cladding Thickness, c - ° (inches)
Low Alloy Steel Thickness, t -4,O._ (inches)
- 3) Combine Flaws Combine flaws in close proximity to other flaws and to the surface per Section 2.3. Draw a rectangle encompassing the combined flaws.
- 4) Classiify FaX. According to Section 2.4 and Figure 2.4 the flat is classified as Class:
- 5) Size Flaw. The dimensions of the flaw to be considered are:
Class A-E Flaws Class F Flaws.
Flaw Depth, b - _ (inches) Flaw Depth, 2d - 23Z (inches)
Flaw Length, I - - (inches) Flaw Length, I - _.&3 (inches)
Surface Dist, S - 1,2XI (inches)
- 6) Calculate Non-dimensional Parameters The following non-dimensional parameters are to be calculated for each flaw:
Class A-E Flaws Class F Flaws Flaw Aspect Ratio, (b/I) -_ Flaw Aspect Ratio, (d/l) -
Flaw Depth Ratio, (b/t) - Flaw Depth Ratio, (d/t) - oX9 1
Proximity Factor, Y - k
- 1) Surface Proximity Factor, Y is calculated as the minimum of 1.0 or (S/d).
DA-FLEV .P 2-17 Date lsed: My 1.1991 NEDC-31980 I1
,,.s ,, ,. w -
SASR 91-44 DRF 137-0010 Table 2.1 - Duane Arnold Flaw Evaluation Worksheet - (continued)
- 7) IWB-3500 Flaw Evaluation. Record the allowable IWB-3500 limit below from Figure 2.5 for Class A through E flaws and from Figure 2.6 using the appropriate curve for "Y" from step 6 for Class F flaws. If the (b/t) or (d/t) ratio recorded in step 6 above is below the IWB limit. check the box 'Acceptable per IWB-3500" below. Otherwise, check the box "Unacceptable per IWB-3500" and continue to step 8.
Class A-E Flaws Class F Flaws Allowable Ratio. (b/t) - Allowable Value. (d/t) - &216 Acceptable per IWB-3500.
$> Unacceptable per IWB-3500.
- 8) Calculate Flaw Depth Including Cladding. The cladding depth shall be added to inside surface flaw (Class B & C depths prior to the IWB-3600 analysis to obtain the total flaw depth. For outside surface flaws, there is no cladding. Therefore, no cladding depth is added. The new values shall be recorded below:
0OC-V-bN:%AC- C"$s VESSL -oen t*
Class B&C Flaws Class DME Flaws Total Flaw Depth. a-b+c - Total Flaw Depth, a - b -
Flaw Aspect Ratio, (a/A) - _
- 9) IWB-3600 Flaw Evaluation. Record the appropriate flaw acceptance diagram Figure f from Section 3. determine and record the allowable flaw depth.
Also record whether the flaw is acceptable or not and for how many years a class B flaw is acceptable. Figure i Surface Flaw (Class A-E) Subsurface Flaw (Class F)
Allowable Depth, aall - - Allowable Depth. 2 dall - k L Acceptable per 1lB-3600. for - years (Class B)
Unacceptable per IWB-3600.
DA FLEV .WP 2-18 DOcIlaImed: July 1, 1991 :ZEDC-31980
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Flaw Acceptance Criteria IC IWB-3500 - Class F Flaws
- 0. 1 r ........................
t 0 .....................................
0.09 n ..
0 .....................................................................
0.08 - ........................................ ........ ......................... ..........................
-0 I.. . . . . . . . . . . . . . . . .
00 I '-, 0.07
- S1 Unacceptable Flow
.I Yb 0.06 -
I taW . ....................... ...... ... .. . . . . . .. . . . . . . .. . .. . .. . . .. . .. . .. . .
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....... ....................... ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~., ,-. .................R...,...,.,.,
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P- Q IWB-3500 Limits-I, 0: ............
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. J ................. .
la I - . .- . . 11
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A 0- .
5I
. cceptable: Flaw:
0.4 I
C).5 0-0.1Ids 0.2 0.3
'a, 0 o W o-
'0 Flow Aspect Ratio (d/Q) 0 .
iWB 2 (,RW
I IN 2.. OS Flaw Acceptance Criteria Region 12 (All) - Cilass D, E & F I-- 1.8 1.7 1.6 1.5 1.4 ii k ID 13
.C 1.2 i- V i
1.1
('D i 04 1 k
I 0 0.9 i
4-I 0.8 0.7 0 0.6 a: 0.5 0.4 0.3 0.2 0.1 0
0 0.1 0.2 0.3 ( 4 0 '
0 flow Aspect Ratio (oa') or (d/P)
FLAW12 ?DRW -J
- %O 0 0 P~
0 .
.A - A.. *h i4 -. wj.*p. I 4 J##b .'4a
Letter, B. Branlund to G. Park Dated May 3, 2001 (Two Pages)
. - . Ut.
GE Nuclear Energy Strnctural Mechanics and Materials 175 Curtner Avenue M/C 747 San Jose. CA 95125 (408) 925-1472 B13-02097-00-07 DRF-B1 3-02097-00-07 Class II May 3, 2001 TO: Gary Park Duane Arnold Energy Center 3277 DAEC Road Palo, IA 52324 FROM: Betty J. Branlund
SUBJECT:
Updated RPV Flaw Evaluation of Duane Arnold Region 12 for the Class F Flaw In the Head Dollar Weld
SUMMARY
The purpose of this letter is to revise the Reference 1 Duane Arnold Energy Center (DAEC) RPV Flaw Handbook evaluation of Region 12 Class F flaws to incorporate the results of the updated Pressure-Temperature Curves Report (Reference 2).
INTRODUCTION/ BACKGROUND:
The DAEC Flaw Acceptance criteria provided in the Reference 1 report was used to disposition a flaw in Region 12 of the DAEC RPV. A key input to the acceptable flaw size is the hydro-test temperature that is determined from the DAEC Pressure-Temperature curves. Since. these curves were revised in September 2000. the RPV flaw acceptance criteria requires revision and the disposition of the flaw in Region 12 would need to be reevaluated.
METHODS AND ASSUMPTIONS:
The methods are consistent with those used in Reference 1, with the following exceptions:
- Fatigue crack growth was included in the evaluation whereas in the Reference 1 report fatigue crack growth was neglected because the value was insignificant. The fatigue crack growth evaluation is consistent with the methods described in Appendix F of Reference 1, but the allowable flaw size was revised to incorporate the updated Pressure-Temperature Curves hydro-test temperature and the number-of-cycles were increased from 100 cycles to 340 cycles. As a result of these changes the fatigue crack growth was increased from 0.002 inches to 0.01 inches.
- The equation for Kg, was revised to correct an error in the ASME Code. The coefficient 1.233 was changed to 1.223: this change does not result in a significant change in the
B13-02097-00-07 513/00 results compared to the change in hydro-test temperature nor the number of cycles used in the evaluation.
RESULTS & CONCLUSIONS:
The allowable flaw size was determined using a hydro-test temperature at 1100 psig of 174F at 25 EFPY (Reference 2) rather than 195F at 12 EFPY (Reference 1). In addition fatigue crack growth was included in the allowable flaw size for this Class F (subsurface) flaws. The allowable flaw size for the DAEC Region 12 Class F flaws is reduced from 1.2 to 1.19 . GE has reviewed the flaw evaluation worksheet provided by the customer (Reference 3) and concurs that the existing flaw remains acceptable.
VERIFICATION:
Using References 1 through 3, letter 813-02097-00-07 was verified by individual design review.
Letter B13-02097-00-07 was verified that it provided accurate documentation of the evaluation performed to determine the allowable flaw size.
Further evidence of verification Is included in DRF-B13-02097-00-07.
Verified By: i&j B. D. Frew. Structural Mechanics and Materials
REFERENCES:
- 1. C.D. Frederickson, 'Duane Arnold Reactor Pressure Vessel F-aw Evaluation Handbook."
GE-NE, San Jose. CA, June 1991, (SASR 91-44, DRF 137-0010).
- 2. B.D. Frew, Pressure-Temperature Curves for Duane Arnold Energy Center," GE-NE.
San Jose, CA, September 2000, (GE-NE-A22-00100-08-01 a). (This report updates the curves for ASME Code Case N-640 and includes the influence of power uprate).
4J24101.