ML20031B631
| ML20031B631 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee, Pilgrim File:NorthStar Vermont Yankee icon.png |
| Issue date: | 04/27/1976 |
| From: | Teledyne Materials Research |
| To: | |
| Shared Package | |
| ML20031B627 | List: |
| References | |
| RTR-NUREG-0619, RTR-NUREG-619 TR-2323, NUDOCS 8110050270 | |
| Download: ML20031B631 (67) | |
Text
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BOSTON EDISON COMPANY
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800 BOYLSTON STREET BOSTON. MA 02199 o
TECHNICAL REPORT TR-2323
[
EVALUATION OF PILGRIM UNIT 1 FEEDWATER N0ZZLE CORNER AND BORE CRACKS
(
APRIL 27, 1976 WTELEDGE MEERIALS N ENGINEERS I'
I 303 BEAR HILL ROAD WALTHAM, MASSACHUSETTS 02154 8110050270 810925 617 8M 33%
l PDR ADOCK 05000271 P
PDR l
W TELEDYNE Technical Report TR-2323 TABLE OF CONTENTS PAGE ABSTRACT
1.0 INTRODUCTION
1 2.0
SUMMARY
, CONCLUSIONS AND RECOMMENDATIONS 1
3.0 DISCUSSION OF RESULTS 1
3.1 Report of Results of I.S.I.
1 3.2 Justification for Using Millstone Reports 2
3.3 Fracture Mechanics Evaluations 2
3.4 Corrective Actions 3
3.5 Base Metal Grindouts 3
3.6 TMR Reconrendations 3
4.0 REFERENCES
4 Appendix A Comparison of Pilgrim 1 and Millstone 1 Feedwater Nozzle Geometries Appendix B Stress and Thermal Results of Millstone, Unit 1, Feedwater Nozzle 1
l Appendix C Fracture Mechanics Evaluations l
l Appendix D Material Toughness Appendix E Evaluation cf Base Metal Grindout Areas
)
1
t YM MATERIALS RESEARCH Technical Report TR-2323 y
1.0 INTRODUCTION
References 3 and 4 describe the results of the recent (February,1976)
Inservice Inspections (ISI)or the Pilgrim, Unit 1 Fee &ater Nozzles and the subsequent repair procedures. This report reviews and evaluates these ISI results in accordance with the applicable ASME Codes.
2.0
SUMMARY
.s The ISI results are reviewed and found to be similar to those reported for the Millstone 1, fee &ater nozzles.
Fracture mechanics analyses based on ASME Code,Section XI,have been performed and it is found that the most f.
critical region is the feedwater nozzle corner. The fracture mechanics results for this region are sunmarized on two curves, Pages C-2 and C-3 0f this report.
It is a conclusion of this report that the margin of safety for the structural integrity of the Pilgrim, Unit 1 Fee &ater Nozzles is being maintained at a level required by the original acceptance standards and that a safe return of the component to full power operations may be ma de.
3.0 DISCUSSION OF RESULTS 3.1 Report of Resul ts of I.S.I.
The February 1976 Inservice Inspection of the Pilgrim, Unit 1 fee &ater nozzles revealed indications in each of the four feedwater nozzles.
Initial dye penetrant examinations revealed a total of 78 indica-tions. With subsequent grinding, 25 of these indications were determined to have penetrated base metal (see Ref. 3), the remaining 53 are assumed to have been totally located in the cladding material. The cracks for the most part are oriented either radial to or axially along the longitudinal axis of the feedwater nozzle and are very much like those found in the L
W TELEDYNE c
MATERIALS RESEARCH Technical Report TR-2323 r
Millstone. Unit 1 Feedwater Nozzles (Ref.1). One major difference in the Pilgrim indications and the Millstone indications is that a number of the Pilgrim indications are located in a region beyond the back edge of the themal sleeve centering tab (nozzle bore). Therefore, fracture mechanics analyses are perfomed, in App. C, to demonstrate that cracks located in the bore region are less severe and that a nozzle corner crack as reported and investigated by Ref.1 is in fact the limiting design case.
i 3.2 Justification for Using Hillstone 1 Reports The geometry comparisons made in Appendix A show that the feedwater nozzles for Pilgrim 1 and Millstone 1 pose virtually the same stress analysis probl em.
In fact, using the pressure stress analysis of Millstone 1 for this report is slightly conservative.
With respect to thermal stresses determined in Refs.1 and 2, it should be noted that these are based on thermal analyses of an improved l
feedwater sparger design and, as indicated by Ref.
4., similar improvements l
are being installed in Pilgrim, Unit 1.
l Therefore, the fracture mechanics evaluations of Appendix C and the conclusions of this report are based on the fact the pressure and themal stresses reported in Refs.1 and 2 are appropriate for the Pilgrim 1 Feedwater Nozzle geometry.
3.3 Fracture Mechanics Evaluations As demonstrated in App. C of this report, the limiting design case g
is the nozzle corner crack; therefore, Figures 2 and 3 of Ref.1 are applicable to the Pilgrim Feedwater Nozzle for normal operating conditions. These figures are reproduced on Pages C-2 and C-3 and result in the establishment of the Code pemissible flaw depth as a function of feedwater temperature as follows:
j A
I WTm m(NE Technical Report TR-2323
.6 ABSTRACT A review and evaluation of the Pilgrim Unit 1 Inservice Inspection Results for the corner and bore cracks in the reactor vessel fee &ater nozzle are made.
Repairs and corrective actions are discussed, followed by a recommendation for a return to safe full power operations.
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W TELEDYNE MATERIALS RESEARCH Technical Report -
TR-2323 FEE 0 WATER TEMPERATURE (*F)
CODE ALLOWABLE P 74l DEPTH (IN) 40 and 160
.37 360
.7 500 1.4 3.4 Corrective Actions As indicated by Refs. 3 and 4, the corrective actions consisted of removing all unacceptable indications by grinding and installing new thennal sleeves with an interference fit which will help prevent a recurrence of the cracking problem. The grind areas were made to blend smoothly with the sur-rounding surface and with a minimum slope of 4 to 1 in base metal and 2 to 1 in cladding.
3.5 Base Metal Grindouts Since the corrective actions call for a removal of base metal where the cracks are found to penetrate base metal, an evaluation of this condition is made in Appendix E of this report. As shown in this Appendix, the area of base metal lost due to grinding is 1.078 in and the excess 2
reinforcement (area provided minus area required) is 3.334 in.
Subtracting 2
these two quantities gives 2.255 in as the excess reinforcement after grinding, which is still an acceptable margin between available and required areas of reinforcement.
3.6 THR Reconinendations Based on the evaluations and reviews of this report, TMR feels D
that the nergin of safety for the structural integrity of the Pilgrim, Unit 1 Feedwat tr Nozzles is being maintained at a level required by the original l
acceptance standards and that a return of the component to full power service is appropriate.
L J
e r
WTm m(NE MATERIALS RESEARCH
~
Technical Report
_4 TR-2323
4.0 REFERENCES
1.
Teledyne Materials Research, Technical Report TR-2186(a),
Reevaluation of Feedwater Nozzle Cladding Defects, Millstone Unit 1, Dated 10/22/75.
2.
TFR Technical Report TR-2186(b), Stress Analysis of Feedwater Nozzle Millstone Unit 1 Dated 2/11/76.
3.
G.E. Installation and Service Engineering Operations Report, Pilgrim Unit #1 Feedwater Nozzle Repair, Dated 3/76.
I 4.
Boston Edison Co. Letter to U.S. Nuclear Regulatory Commission, Licensee Event Report 76 - 7/lT Supplement, Docket Number 50-293 License DPR-35, Dated 3-29-76.
1 5.
Combustion Engineering, Inc. Report No. CENC 1139, Analytical Report for Pilgrim Reactor Vessel, Dated 3/9/71.
6.
Combustion Engineering, Inc. Report No. CENC 1126, Analytical Report for Millstone Reactor Vessel, Dated 12/7/70.
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Page C-4 is a Stress Intensity Factor vs. Flaw Depth and Distance from Vessel Wall Plot. This curve demonstrates that the nozzle corner cracks evaluated in Ref. I are a limiting design case.
Page C-5 is an Isotoughness Plot for the Pilgrim i Feedwater Nozzle and is determined by using:
1) the material toughness information of Appendix D of this report, 2) the steady state temperature distribution for feedwater temperature equal to 40*F, Page B-1 of this report, and 3) Figure A-4200-1 of ASME Code,Section XI.
Pages C-6 through C-10 are plots o'T Stress Intensity Factor vs. Flaw Depth for three different feedwater temperatures, 40 F,160 F and 360 F.
These pages are used to establish the Stress Intensity Factor vs. Flaw Depth and Distance from Ves.el Wall plot, Page C-4.
The remaining Pages C-Il through C-38are the calculations used in establishing the Stress Intensity Factor vs. Flaw Depth plots shown on Pages C-6 through C-10.
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