ML092520239
| ML092520239 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 08/31/2009 |
| From: | Brandi Hamilton Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML092520239 (13) | |
Text
PDuke oEnergy BRUCE H. HAMILTON Vice President McGuire Nuclear Station Duke Energy MG0 1VP /12700 Hagers Ferry Road Huntersville, NC 28078 980-875-5333 980-875-4809 fax bruce. hamilton@duke-energy. com August 31, 2009 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001
Subject:
Duke Energy Carolinas, LLC (Duke)
McGuire Nuclear Station, Unit 1 Docket No. 50-369 Relief Request 09-MN-006 Pursuant to 10 CFR 50.55a(g)(5)(iii), Duke requests relief from the weld examination requirements of the ASME Boiler and Pressure Vessel Code, Section X1, as described in attached Relief Request 09-MN-006.
Please direct any questions pertaining to this submittal to P. T. Vu of Regulatory Compliance at (980) 875-4302.
Sincerely, B. H. Hamilton Attachments K1(?A~
www. duke-energy. corn
U. S. Nuclear Regulatory Commission August 31, 2009 Page 2 xc w/attachments:
L. A. Reyes, Regional Administrator U. S. Nuclear Regulatory Commission, Region II Sam Nunn Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, GA 30303 J. H. Thompson, Project Manager U. S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop 0-8 G9A Rockville, MD 20852-2738 J. B. Brady, Senior Resident Inspector U. S. Nuclear Regulatory Commission McGuire Nuclear Station
Duke Energy Corporation McGuire Nuclear Station Unit 1 Relief Request Serial #09-MN-006
Relief Request 09-MN-006 McGuire, Unit 1 August 31, 2009 Page 1 of 4 ASME Code Component Affected Safety Injection System Full Coupling to Pipe Weld ASME Code Class 2 Weld ID = 1N1231-1 Item Number/Summary Number = M1.R1 11.0142 III.
Applicable Code Edition and Addenda
ASME Boiler and Pressure Vessel Code, Section Xl - 1998 Edition thru the 2000 Addenda II.
Applicable Code Requirement
The examination requirements for Class 1 and 2 piping welds are governed by the Risk-Informed Inservice Inspection program which is based on WCAP-14572, Revision 1-NP-A. The WCAP Table 4.1-1, Examination Category R-A, Risk-Informed Piping Examinations, requires 100% of the exam location to be examined per Figure IWC-2500-7(a) for Item Number M1.R1.11.0142.
IV.
Impracticality of Compliance The material is stainless steel. This weld has a wall thickness of 0:281 inches and a nominal pipe size of 1.5 inches.
This weld is required to be examined in accordance with ASME Section Xl, Appendix VIII, Supplement 2, 1998 Edition through the 2000 Addenda.
Ultrasonic examination resulted in 77.5% coverage using 450 and 60' shear waves in the axial direction and 380 shear waves in the circumferential direction.
In addition, a supplemental examination from the coupling side was performed using 700 shear waves. This supplemental examination is not included in the percent of coverage because a qualification for examination of cast stainless steel does not exist.
The percentage of coverage reported represents the aggregate coverage from the 380, 45P, and 600 scans performed on the weld and adjacent base material.
The coverage from each angle beam scan is shown on the following table.
Relief Request 09-MN-006 McGuire, Unit I August 31, 2009 Page 2 of 4 Weld Lent Percent of Percent of Prmr nls Beam Length Volume Coverage Primary Angles Direction Scanned Voue Cvrg Drtn cned Covered Claimed (inches)
Axial 600 shear Coupling 5.96 60 60 Side 450 shear Axial Pipe 5.96 50 50 Side Counter 380 shear Clockwise 5.96 100 100 Coupling Side 380 shear Clockwise 5.96 100 100 Pipe Side Aggregate =77.5%
Weld Percent Percent of Percent Supplemental Beam Length of Coverage Actual Angle Direction Scanned Volume Claimed Coverage (inches)
Covered 700 Axial Pipe 5.96 100 0
50 Side (60+50+ 100+ 100)/4=77.5%
The limitation was caused by the proximity of a taper which provides a transition from a full coupling to a pipe. In order to scan all of the required volume for this weld, the weld would have to be redesigned to allow scanning from both sides of the weld, which is impractical.
The McGuire Inservice Inspection Plan allows the use of Code Case N-460, which requires greater than 90% volumetric coverage of examination volume C-D-E-F. Therefore, the available coverage will not meet the acceptance criteria of this Code Case.
Burden Caused by Compliance V.
See section IV, fourth paragraph.
Relief Request 09-MN-006 McGuire, Unit 1 August 31, 2009 Page 3 of 4 VI.
Proposed Alternative and Basis for Use Radiography (RT) is not a desired option because RT is limited in the ability to detect degradation mechanisms such as thermal fatigue cracking and stress corrosion cracking initiating at the pipe inside surface. Additionally, radiography has not been qualified through performance demonstration.
There is only one weld (1 N1230-6) remaining in this Risk Segment (NI-063B) which would qualify as a possible replacement for Weld ID 1N1231-1. Weld ID 1 N1230-6 has a configuration of Reducer to Coupling which would provide less examination coverage. Therefore, no substitution alternative for this weld is available which would provide better coverage.
VII.
Duration of Proposed Alternative This request is for the duration of the third inservice inspection interval, currently scheduled to end on December 1, 2011.
VIII.
Justification for Granting Relief Ultrasonic examination of the weld for Item Number M1.R1.11.0142 was conducted using personnel, equipment, and procedures qualified in accordance with ASME Section XI, Appendix VIII Supplement 2 of the 1998 Edition with the 2000 Addenda as administered by the Performance Demonstration Initiative (PDI). In the case of this piping weld, NRC has imposed requirements for coverage of stainless steel piping welds in 10CFR50.55a (b) (2) (xv) (A) (1). This requires scanning of the weld and adjacent base material from four orthogonal directions. If this requirement cannot be met, then the NRC will not allow credit for coverage on the far side of the weld unless a demonstration test is passed with all flaws being on the far side of the weld. The demonstration requires detection, length sizing, and through wall sizing of flaws with the sound beam passing through the austenitic weld metal. The PDI qualification test could not meet the NRC requirements; therefore credit for full ultrasonic coverage is not claimed.
There were no recordable indications found during the examination of this weld.
Surface examination was not required.
IWB-2500, Table IWB-2500-1, Examination Category B-P System Leakage Tests and VT-2 visual examinations performed each refueling outage provide adequate assurance of pressure boundary integrity.
Relief Request 09-MN-006 McGuire, Unit 1 August 31, 2009 Page 4 of 4 In the event of weldment leakage, early detection capability is afforded by diverse reactor coolant system (RCS) leakage detection instrumentation and routine RCS leakage calculations. Technical Specification 3.4.15 requires the RCS leakage detection instrumentation to be operable during Modes 1-4. The RCS leakage detection instrumentation is primarily comprised of the containment atmosphere particulate radioactivity monitors, containment sump level instrumentation, and the containment ventilation unit condensate drain tank level monitor. Similarly, Technical Specification surveillance requirement 3.4.13.1 requires that a RCS mass balance be performed every 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The periodic RCS leakage calculations and diverse RCS leakage detection instrumentation would afford early detection capability in the event of weldment leakage, whereby mitigative actions could be taken prior to catastrophic component failure.
The component weld was examined by volumetric NDE methods during construction and verified to be free from unacceptable fabrication defects.
Based on the coverage and results of the volumetric and the pressure testing VT-2 examinations performed and the sump rate monitoring, it is Duke's position that a reasonable assurance of component integrity exists.-
IX.
Previous Submittals None.
X.
Attachments Attachment A contains the examination data for the examination of this weld.
OLDuKe rs Energy-Site/Unit: McGuire /
Summary No.:
M1i.
UT Pipe Weid Examination 1
R1.1 10142 Procedure:
Procedure Rev.:
PDI-UT-2 C
Outage No.:
MI-19 Report No.:
UT-08-033 Workscope:
ISI Work Order No.:
01783505 Page:
1 of 4
Code:
1998/2000 Addenda Cat./Item:
R-A/R1.11 Location:
Drawing No.:
MCFI-1NI74
==
Description:==
Full Coupling to Pipe System ID:
NI Component ID: 1N1231-1 Size/Length:
N/A Thickness/Diameter:
0.281 / 1.500 Limitations:
Yes - See Attached Limitation Report Start Time:
0940 Finish Time:
0954 Examination Surface:
Inside 7 Outside v,,
Surface Condition: AS GROUND Lo Location:
9.1.1.4 Wo Location:
Centerline of Weld Couplant:
ULTRAGEL II Batch No.:
07125 Temp. Tool Mfg.:
D.A.S Serial No.:
MCNDE32823 Surface Temp.:
82 OF Cal. Report No.:
CAL-08-1 23, CAL-08-124, CAL-08-125, CAL-08-126, CAL-08-127 Angle Used 0
45 45T 60 70 38 Scanning dB 40.8 54.0 61.6/63 52,0 Indication(s):
Yes r, No
- Scan Coverage:
Upstream
- Downstream E.
Comments:
FC 08-01, 08-04 Results:
Accept 7 Reject Z Info 7 Initial Section Xl Exam Percent Of Coverage Obtained > 90%:
No Reviewed Previous Data:
No Examiner Level Il-N yg e.L Date Reviewer g
ure Date Dean, Steven 10/17/2008 Gayle E Houser Level III LY -
-t)-.,
11/8/2008 Examiner Level II-N Signature Date Site Review Sfoafure Date C1 Ransom, Greg J.
10/17/2008 N/A 10/17/2008 Other Level N/A A
Signature Date ANII Review
\\i n ture (
Date N/A 1 /7/2008 Nancy Ritchie Slaughter
,.11/8/2008 t,
lA T)r A!
A/
A.j
.A Kt IeLT ý I,----
U
-/-k
-ut)(01 A-C-4
DUKE ENERGY COMPANY ISI LIMITATION REPORT Summary #:
MI.RI.11.0142 Component ID 1N1231-1 remarks:
L-NO SCAN SURFACE BEAM DIRECTION Due to configuration
[
LIMITED SCAN
-1
[2 I 1
[
2
-cw Liccw FROM L N/A to L N/A INCHES FROM WO 1.7 to Beyond ANGLE:
Li 0 [] 45 N 60 other FROM o DEG to 360 DEG Li NO SCAN SURFACE BEAM DIRECTION Li LIMITED SCAN L1 L i2
-1 i 2
-. cw i ccw FROM L to L INCHES FROM WO to ANGLE:
Li 0 Li 45 Li 60 other FROM DEGto DEG Li NO SCAN SURFACE BEAM DIRECTION Li LIMITED SCAN L] 1
[L 2 Li1 ]
2 L cw El ccw FROM L to L INCHES FROM WO to ANGLE:
Li 0 Li 45 Li 60 other FROM DEG to DEG Li NO SCAN SURFACE BEAM DIRECTION Li LIMITED SCAN i1 El 2 i 1 i 2 L cw Eccw FROM L to L INCHES FROM WO to Sketch(s) attached ANGLE:
D 0 D] 45
[] 60 other FROM DEG to DEG i
yes Li No
'gLevel:e Date:
Prepared By:
Greg Rapsom Leve":
Dat:
10/J7/2008 Sheet 2
of_*
'y., &<
Reviewed By:
Date:.AuthoriZd Inspector:
Dat A*A, ý- P,-
e 6,ý-M14-666N U-
pbM.
Supplemental Report Report No.:
Page:
Summary No.: M1.R1.11.01ý Examiner: Dean, Stever Examiner: Ransom, Gre Other:
N/A i~~zi Level:
I1-N Level:
I1-N Level:
N/A Revi ewer:
4 e
Site Review:
N/A, 19 ANJI Review:
UT-08-033 3
of Date:
Date:
Date:_
Comments: IA.E,2,'-/
S/7&A S"
A L
I i
i ct(-cc~-k~44#izt A./I,
0'E nergy.
Determination of Percent Coverage for UT Examinations - Pipe Site/Unit:
McGuire /
1 Summary No.:
M1.R1.11.0142 Workscope:
ISI Procedure:
Procedure Rev.:
Work Order No.:
PDI-UT-2 C
01783505 Outage No.:
M1-19 Report No.:
UT-08-033 Page:
4 of 4
45 deg Scan 1 Scan 2 Scan 3 Scan 4 100.000
% Length X 100.000
% Length X 100.000
% Length X 100.000
% Length X 50.000
% volume of length / 100 =
0.000
% volume of length / 100 =
100.000
% volume ot length / 100 =
100.000
% volume of length / 100 =
50.000 0.000 100.000 100.000
% total tor Scan 1
% total for Scan 2
% total tor Scan 3
% total for Scan 4 Add totals and divide by # scans 62.500
% total for 45 deg Other deg -
60 (to be used for supplemental scans)
The data to be listed below is for coverage that was not obtained with the 45 deg scans.
Scan 1 Scan 2 Scan 3 Scan 4 100.000
% Length X
% Length X
% Length X
% Length X 60.000
% volume of length / 100 =
% volume of length / 100 =
% volume of length / 100 =
% volume of length / 100 =
60.000
% total for Scan 1
% total for Scan 2
% total for Scan 3
% total for Scan 4 Percent complete coverage Add totals for each scan required and divide by # of scans to determine; 6t, -
% Total for complete exam 0O/(,7)Oq Q///
Site Field Supervisor:
Date:
//-
7- 0 ýý"
ýc_
e_ý
Site/Unit: McGuire /
1 Summary No.:
M1.R1.11.0142 Workscope:
IS / 1EOC19 UT Base Metal _amination Procedure:
Procedure Rev.:
Work Order No.:
NDE-640 4
01783505 Outage No.:
Report No.:
BOP-UT-08-064 Page:
1 of Code:
1998/2000 Addenda Cat./Item:
N/A Location:
N/A
-v Drawing No.:
MCFI-1N174
==
Description:==
Full Coupling to Pipe System ID:
NI Component ID: 1N1231-1 Size/Length:
N/A Thickness/Diameter:
.281/1.50 Limitations:
None Start Time:
0947 Finish Time:
1100 Examination Surface:
Inside Outside,
Surface Condition: AS GROUND Lo Location:
9.1.1.4 Wo Location:
Centerline of Weld
-Couplant:
ULTRAGEL II Batch No.:
07125 Temp. Tool MIfg.:
D.A.S Serial No.:
MCNDE32823 Surface Temp.:
82
-F Scanning dB:
44.1 Cal. Report No.:
CAL-08-122 Amplitude Position One Position Max Position Two
- mnd, Loss Remarks No.
Back Wall Full Screen L1 Wl W2 MP LM W1 W2 MP L2 W1 W2 MP NRI Comments:
Results:
Accept v Reject Info Initial Section Xl Exam Percent Of Coverage Obtained > 90%:
Yes Reviewed Previous Data:
No Examiner Level I11N gnature Date Reviewer Signature Date Ellis I1, Kenneth R.
{
7 10/16/2008 Examiner Level N/A Signature Date Site eview Signature Date N/A 10/16/2008 N/A Other Level N/A Signature Date ANtI ReView,,
Date N/A 10/16/2008 1A44i
`
//.*.Z
>L<
,1.
9 LJ/c_.'C (Z'
7.
Duke Summary No.: M1.R1.11.0142 Examiner: Ellis II, Kenneth R.
Examiner:
N/A Other:
N/A Supplemental Report Report No.:
Page:
Level:
1I-N Level:
N/A Level:
N/A
.Reviewer:
Site Review:
N/A ANII Review:
/
.)
4..
/" "J"-"
Z
{jr BOP-UT-08-064 2
of
/
Date: ",
Date:
Date: /..;!*/2; "c.....
Comments:,,
vyje Sketch or Photo: Z:\\UT\\IDDEAL\\ProfileLine2.jpg 5-!
(
r
-iz
~zO
&3 K e
-1 I-I - K e ni-M-t)n6) A7ta,::-k A< 6,:ý7t