ML20150B368
| ML20150B368 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 01/31/1988 |
| From: | Palusamy S, Witt F WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML19302D299 | List: |
| References | |
| WCAP-11164-S01, WCAP-11164-S1, NUDOCS 8803160355 | |
| Download: ML20150B368 (28) | |
Text
ATTACMENT 3 WCAP-lll64. SUPPLEMENT 1. "ADDITIONAL INFORMATION IN SUPPORT OF THE TECHNICAL JUSTIFICATION FOR ELIMINATING LARGE PRIMARY LOOP PIPE RUPTURE AS THE STRUCTURAL DESIGN BASIS FOR NORTH ANNA UNITS 1 AND 2" (NON-PROPRIETARY)
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I 8803160355 980308 PDR ADOCK 05000338 P
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WESTINGHOUSE CLASS 3 WCAP-11164 Supplement 1 ADDITIONAL INFORMATION IN SUPPORT OF THE TECHNICAL JUSTIFICATION FOR ELIMINATING LARGE PRIMARY LOOP PIPE RUPTURE AS THE STRUCTURAL DESIGN BASIS FOR NORTH ANNA UNITS 1 AND 2 January 1988 S. A. Swamy J. C. Schmertz C. B. Bond Y. S Lee C. C. Kim Verified by:
/
F. M Witt h-Lg Approved by:
/ 5. 5. f&lusa8y,'Wanage7 Structural Waterials Engineering
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Work Performed Under Shop Order VH0J950 WESTINGHOUSE ELECTRIC CORPORATION Generation Technology Systems Division P.O. Box 2728 Pittsburgh, Pennsylvania 15230-2728
TABLE OF CONTENTS Section Title Page 1-1 1.0
SUMMARY
AND INTRODUCTION 1-1 1.1 Summary 1-1 1.2 Introduction 2.0 FABRICATION AND WELDING PROCESSES FOR THE PRIMARY LOOP 2-1 3-1 3.0 KATERIAL PROPERTIES 4-1 4.0 LEAKAGE FLAW DETERMINATIONS 5-1 5.0 STABILITY ANALYSES 6-1 6.0 DISCUSSION AND CONCLUSIONS 6-1 6.1 Discussion 6-2 6.2 Conclusion 7-1
7.0 REFERENCES
APPENDIX A - THE NRC REQUEST FOR ADDITIONAL INFORMATION A-1 O
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LIST OF TA.BLES
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Table Title Page l~
S3-1 Mechanical Properties of the Primary Loop Materials for North Anna Units 1 and 2 at Room Temperature 3-2 53-2 Mechanical Properties of the Primary Loop Materials for North Anna Units 1 and 2 at 650*F 3-5 l
S3-3 Lower-Bound and Average Materials Properties Used in the North Anna Units 1 and 2 Leak-Before-Break Analysis 3-7 l
S4-1 Leak Rate Results 4-2 55-1 Results of Stability Analyses 5-2 m
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asas-ciama to yg
LIST OF FIGURES Figure Title Page S3-1 Lower Bound Stress-Strain Curve for SA351 CF8A at 620*F 3-8 S3-2 Lower Bound Stress-Strain Curve for SA351 CF8M at 620'F 3-9 S3-3 Lower Bound Stress-Strain Curve for SA351 CF8M at 556'F 3-10 e
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SECTION 1.0
SUMMARY
AND INTRODUCTION 1.1 Summary Virginia Electric Power Company submitted a leak-before-break analysis for the reactor coolant loops, WCAP-11163, to NRC in support of their snubber 1
reduction program for North Anna Units 1 and 2.
After completing their review the NRC transmitted to Virginia Electric Power Company a request for additional information. Virginia Electric Power Company contracted with j
Westinghouse Electric Corporation to respond to the NRC request including the performance of analyses.
This report represents the response.
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Additional materials information is provided. Additional leak-before-break i
analyses were performed using average properties for leak-rate calculations j
and lower-bound properties for stability calculations.
Elastic plastic fracture mechanics procedures were applied. The margin criteria of 10 on leakage rate, 2 on crack size and 1.4 on lead were met as detailed in the NRC request.
It is concluded that leak-before-break conditions are demonstrated for North Anna Units 1 and 2 primary loops using the criteria and recommendations provided by the NRC. The conclusions of WCAP-11163 are unchanged.
1.2 Introduction Virginia Electric Power Company contracted with Westinghouse Electric Corporation to develop a leak-before-break analysis for the North Anna Units 1 and 2 nuclear power plant for licensing support in their snubber reduction program. The leak-before-break analysis is documented in Westinghouse ProprietaryClass2ReportWCAP-11163(references 1.1). WCAP-11164 is the associatec' Westinghouse Class 3 report. During the regulatory review process.
the Nuclear Regulatory Commission (NRC) issued a Request for Additional Information on Elimination of Postulated Primary Loop Pipe Ruptures as a Design Basis.
This report addresses the NRC request.
The NRC request is l
given in Appendix A.
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Portions of the NRC request are answered as independent items; however, those directly involving the calculational motheds are best addressed by presenting a reanalysis reflecting the NRC's request. Specifically, request itsms 1, 2, and 3 are addressed in separate sections while items 4, 6 and 7, are addressed in the same section.
Item 5 is addressed in the concluding discussion. The details included in WCAP-11163 are referenced extensively and, in general, will not be reproduced in this report.
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SECTION 2.0 FABRICATION AND WELDING PROCESSES FOR THE PRIMARY LOOP The primary loop piping of North Anna Units 1 and 2 are made of SA351 CF8A cast stainless steel. The elbows are made of SA351 CF8M cast stainless steel. The piping is centrifuga11y cast while the fittings are statically cast. The field welds feature a gas tungsten are weld (GTAW or TIG) root pass followed by shielded metal are welding (SMAW) to completion. The shop welds 4
are either SMAW or submerged arc (SAW) with a GTAW root pass. Weld repairs on shop welds would be either SMAW or GTAW. The welds have TP 308 stainless steel chemistry.
No solution annealing was performed.
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SECTION 3.0 MATERIAL PROPERTIES The material properties presented in tables S3-1 through S3-3 of WCAP-11163 are the ASME Boiler and Pressure Vessel Code Section III minimum properties at the operating temperatures. However, to perform the reanalyses given in the next section, elastic plastic analyses are required. The material properties at operating temperatures were calculated as follows:
Plant specific material certifications were used to establish the tensile properties for the leak-before-break analyses.
Table S3-1 shows the tensile properties at 70'F for SA351 CF8A and SA351 CF8M materials. Table S3-2 shows the tensile properties at 650*F as taken from the material certifications.
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The lower bound properties were used for crack stability analysis and the average properties were used for leak rate calculations.
These properties are summarized in table S3-3 for the critical locations discussed in reference S1.1. The lower bound stress-strain curves used in the stability evaluations are given in figures S3-1 through S3-3 obtained using the methodology of reference 53.1.
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TABLE S3-1 MECHANICAL PROPERTIES OF THE PRIMARY LOOP MATERIALS FOR NORTH ANNA UNITS 1 AND 2 AT ROOM TEMPERATURE 0.2% OFFSET YIELD ULTIMATE STRENGTH
% REDUCTION PRODUCT FORM HEAT NR MATERIAL STRESS (PSI)
(PSI)
ELONGATION IN AREA 27.5 in. ID Cold B-2356 A351 CF8A 39,450 81,100 50.0 61.8 Leg Pipe B-2548 A351 CF8A 35,000 78,300 52.0 65.9 B-2620 A351 CF8A 40,950 79,900 52.0 71.0 B-2647 A351 CF8A 42,300 83,400 55.0 73.2 B-2659 A351 CF8A 39,800 77,611 59.0 73.4 B-2608 A351 CF8A 43,950 84,700 43.0 62.8 B-2632 A351 CF8A 38,950 80,100 56.0 74.3 4
B-2715 A351 CF8A 43,000 83,283 53.0 64.8 143325 A351 CFBA Lo,100 84,250 52.0 N/A
"' 29 in. ID Hot B-2641 A351 CF8A 39,950 82,900 53.0 66.8 Leg Pipe B-2764 A351 CF8A 41,958 82,215 50.0 69.0 B-2744 A351 CF8A 36,960 79,020 49.0 69.7 31 in. ID Cross-C-1037A, A315 CF8A 43,000 85,700 55.5 64.7 over Leg Piping B,C C-1153A A351 CF8A 39,460 83,310 56.0 70.6 C-11538 A351 CF8A 39,460 83,310 56.0 70.6 C-1632A A351 CF8A 39,960 83,100 50.0 65.6 31 in. ID x 900 K0169 A351 CF8M 48,800 80,300 39.4 63.2 N/ Splitter K0222 A351 CF8N 41,100 74,700 50.4 64.2 27.5 in. ID X 56818 A351 CF8M 41,600 74,700 46.1 65.1 350 Elbow 56824 A351 CF8N 50,500 76,300 43.1 66.9 56844 A351 CF8M 46,100 76,300 40.1 64.2 31 x 29 in. ID 58071 A351 CF8M 50,500 79,700 40.1 63.2 Reducing Elbow 58090 A351 CF8M 52,800 83,100 37.8 66.0 58118 A351 CF8N 47,200 76,900 46.8 71.3 mmw4mmm r
l TABLE S3-1 (cont.)
MECHANICAL PROPERTIES OF THE PRIMARY LOOP MATERIALS FOR NORTH ANNA UNITS 1 AND 2 AT ROOM TEMPERATURE 0.2% OFFSET YIELD ULTIMATE STRENGTH
% REDUCTIGN PRODUCT FORM HEAT NR MATERIAL STRESS (PSI)
(PSI)
ELONGATION IN AREA 2
31 in. ID x 400 57528A A351 CF8N 42,100 74,100 50.9 66.0 Elbow 57604 A351 CF8M 39,900 72,400 56.9 61.3 31 in. ID x 900 57412 A351 CF8M 41,000 76,300 49.5 66.9 Elbow 57452 A351 CF8M 42,780 75,200 50.5 72.2 57604 A351 CF8M 39,900 72,400 56.9 61.3 31 in. ID x 900 K0160 A351 CF8N 47,200 80,300 48.4 67.8 w/ splitter
'" 27.5 in. ID Cold C-2291A A351 CF8A 37,460 80,920 47.0 63.0 J
Leg Pipe
&B C2152 A351 CF8A 35,090 79,200 50.0 68.5 i
l C-2230 A351 CF8A 46,200 82,500 54.0 68.6 C-2246 A351 CF8A 39,960 83,920 53.0 68.8 C-2205A A351 CF8A 44,955 79,320 51.0 64.2
&B 147377, A351 CF8A 51,380 83,400 52.0 N/A PCSI-3 29 in. ID Hot Leg C-1638 A351 CF8A 44,455 84,815 47.0 64.7 Pipe C-1804 A351 CF8A 41,960 80,920 50.0 69.0 C-1751 A351 CF8A 42,600 83,750 50.0 72.5 3/in. ID Crossover C-2103 A351 CF8A 40,960 82,320 41.0 71.9 leg Pipe C-1767A, A351 CF8A 43,800 83,750 55.5.
68.8 8,C C-16328 A351 CF8A 39,960 83,100 50.0 65.6 C-1153C A351 CF8A 39,460 83,310 56.0 70.6 l
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'iABLE S3-1 (cont.)
MECHANICf.L PROPERTIES OF THE PRIMARY LOOP MATERIALS FOR NORTH ANNA UNITS 1 AND 2 AT ROOM TEMPERATURE 0.2% OFFSET YIELD ULTIMATE STRENGTH
% REOUCTION PRODUCT FORM HEAT NR MATERIAL STRESS (PSI)
(PSI)
ELONGATION IN AREA 27.5 in. ID x 350 57663 A351 CF8N 54,500 84,800 34.9 57.3 Elbow 57731 A351 CF8N 51,600 81,400 45.0 62.3 57801 A351 CF8M 48,300 79,700 44.0 71.3 31 x 29 in. ID 58148 A351 CF8M 51,600 85,300 40.7 66.9 Reducing Elbow 58159 A351 CF8N 46,100 83,600 46.2 63.2 31 in. ID x 400 58090 A351 CF8N 52,800 83.100 37.8 66.0
, Elbow 58118 A351 CF8M 47,200
~76,900 46.8 71.3
31 in. 10 x 900 58009 A351 CF8M 47,200 78,000 38.4 67.8 Elbow 58037 A351 CF8M 44,900 76,900 51.0 71.3 58071 A351 CF8M 50,500 79,700 40.1 63.2 31 in. ID x 900 K0399 A351 CF8N 40,400 72,400 42.1 69.6 W/ Splitter K0134 A351 CF8N 50,000 80,300 45.5 65.1 K0876 A351 CF8M 41,000 74,700 47.9 67.8
TABLE S3-2 MECHANICAL PROPERTIES OF THE PRIMARY LOOP MATERIALS FOR NORTH ANNA UNITS 1 AND 2 AT 650*F 0.2% OFFSET YIELO ULTIMATE STRENGTH
% REDUCTION PRODUCT FORM HEAT NR MATERIAL STRESS (PSI)
(PSI)
ELONGATION IN AREA
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27.5 in. 10 Cold B-2356 A351 CF8A 23,400 60,000 31.0 53.0 8-2548 A351 CF8A 21,500 63,000 39.0 57.3 B-2620 A351 CF8A 24,800 67,000 36.0 54.7 B-2647 A351 CF8A 22,400 64,250 46.0 59.4 B-2659 A351 CF8A 20,000 58,500 43.5 59.8 B-2608 A351 CF8A 23,700 64,500 37.0 58.6 8-2632 A351 CF8A 20,900 63,750 46.0 68.6 8-2715 A351 CF8A 21,000 65,000 43.0 65.4 143325 A351 CF8A 24,450 N/A N/A N/A Y
'" 29 in. ID !!ot B-2641 A351 CFBA 20,300 62,500 47,5 64.7 Leg Pipe B-2764 A351 CFBA 22,200 64,500 42.0 66.7 B-2744 A351 CF8A 23,300 64,000 41.5 63.5 31 in. ID Cross-C-1037A, A351 CF8A 27,400 66,000 38.0 58.6 over Leg Piping 8,C C-1153A A351 CF8A 23,700 65,750 38.0 53.8 C-11538 A351 CF8A 23,700 66,000 38.0 58.6 C-1632A A351 CF8A 24,200 60.000 39.0 51.1 31 in. ID x 900 K0169 A351 CF8N 30,300 64,000 39.4 62.3 W/ Splitter K0222 A351 CF8M 24,700 57,300 41.0 65.1 4
27.5 in. 10 x 56818 A351 CF8N 24,700 53,900 54.0 64.2 350 Elbow 56824 A351 CF8M 31,400 66,200 44.7 42.8 56844 A351 CF8M 25,200 56,100 32.4 47.5 31 in. 10 x 400 57528A A351 CF8M 24,730 56,100 44.7 59.3 ribow 57604 A351 CF8M 23,600 56,100 49.8 59.3 l
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TABLE S3-2 (cont.)
MECHANICAL PROPERTIES OF THE PRIMARY LOOP MATERIALS FOR NORTH ANNA UNITS 1 AND 2 AT 650*F 0.2% OFFSET YIELD ULTIMATE STRENGTH
% REDUCTION PRODUCT FORM HEAT NR MATERIAL STRESS (PSI)
(PSI)
ELONGATION IN AREA 31 in. ID x 900 57412 A351 CF8M 25,800 59,500 49.8 59.3 Elbow 57452 A351 CF8N 24,700 58,400 46.0 59.3 57604 A351 CF8M 23,600 56,100 49.8 59.3 31 in. ID x 900 K0160 A351 CF8M 33,700 64,000 36.0 60.3 t/ splitter 4
27.5 in. ID Cold C-2291A& A351 CF8A 23,100 65,000 35.0 32.0 Leg Pipe C-2152 A351 CF8A 19,950 62,250 42.5 34.7 3'
C-2230 A351 CF8A 23,700 66,250 46.0 60.1 C-2246 A351 CFBA 26,400 66,250 37.5 51.9 C-2205A& A351 CF8A 22,700 64,000 43.5 57.3 8
147377, A351 CF8A 25,650 N/A N/A N/A PCS 1-3 29 in. ID Hot Leg C-1638 A351 CF8A 22,300 64,000 39.0 64.7 Pipe C-1804 A351 CF8A 25,500 64,500 42.0 61.8 C-1751 A351 CF8A 25,000 67,000 37.0 50.6 31 in. ID Crossover C-2103 A351 CF8A 23,400 65,000 37.5 60.3 Leg Pipe C-1767A. A351 CFBA 23,100 63,750 41.0 59.8 8,C C-16328 A351 CF8A 24,200 66,000 39.6 51.1 C-1153C A351 CF8A 23,700 65,750 38.0 53.8 31 in. ID x 900 K0399 A351 CF8M 25,800 55,600 28.9 63.2 t/ Splitter K0134 A351 CF8M 31,400 65,900 36.6 63.2 K0876 A351 CF8N 21,600 55,000 35.6 59.3 N/A a not available an* 42n...
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TABLE S3-3 LOWER-BOUND AND AVERAGE MATERIAL PROPERTIES USED IN THE l
NORTH ANNA UNITS 1 AND 2 LEAK-BEFORE-BRE2X ANALYSIS
- TEMPERATURE YIELD STRESS ULTIMATE STRESS MODULUS OF LOCATIONS MATERIAL PROPERTY TYPE
(*F)
(psi)
(psi)
ELASTICITY (psi) 1 SA351 CF8A Lower Bound 620 a,c e
]
Average 620 2
SA351 CF8N Lower Bound 620 l
Average 620 3,4,5 SA351 CF8N Lower Bound 556 Average 556
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"Poisson's ratio used is 0.3 mae.-e m os w
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Figure S3-1: Lower Bound Stress-Strain Curve for SA351 CFBA at 620'F 5
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