ML12020A236
| ML12020A236 | |
| Person / Time | |
|---|---|
| Site: | Mcguire |
| Issue date: | 01/11/2012 |
| From: | Repko R Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 12-MN-002 | |
| Download: ML12020A236 (12) | |
Text
Duke.
REGIS T. REPKO Duk1e Vice President dP Energy McGuire Nuclear Station Duke Energy MG01 VP / 12700 Hagers Ferry Rd.
Huntersville, NC 28078 980-875-4111 980-875-4809 fax regis. repko@duke-energy. corn January 11, 2012 10 CFR 50.55a U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
Subject:
Duke Energy Carolinas, LLC (Duke Energy)
McGuire Nuclear Station, Unit 2 Docket No. 50-370 Relief Request Serial # 12-MN-002 Limited Weld Examinations during Refueling Outage 2EOC20 Pursuant to 10 CFR 50.55a(g)(5)(iii), Duke Energy hereby requests NRC approval of relief for the weld listed in Table 1 of the proposed relief request. This weld was required to be examined in accordance with Inservice Inspection Plan for McGuire Unit 2, Third 10-Year Inservice Inspection Interval. The details of the request are included in the enclosure.
This submittal contains no regulatory commitments.
If you have any questions or require additional information, please contact P.T. Vu at (980) 875-4302.
Sincerely, Regis T. Repko Enclosure www.duke-energy.comr
U. S. Nuclear Regulatory commission January 11, 2012 Page 2 xc:
V. M. McCree, Region II Administrator U. S. Nuclear Regulatory Commission Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, GA 30303-1257 J. H. Thompson, Project Manager U. S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop O-8G9A Rockville, MD 20852-2738 J. Zeiler NRC Senior Resident Inspector McGuire Nuclear Station
ENCLOSURE Relief Request 12-MN-002
McGuire Relief Request 12-MN-002 1.0 Scope of Relief Request Relief is requested pursuant to 10 CFR 50.55a(g)(5)(iii) for the weld listed in Table 1. This weld was required to be examined in accordance with Inservice Inspection (ISI) Plan for the following Unit:
McGuire Nuclear Station - Unit 2 Third 10-Year ISI Interval Interval Start Date: 03/01/2004 Table 1 Relief McGuire Examination Weld ID Item/Summary Examination Request Unit Performed Number Number Data Section Number (Refuelinq Number Outage 2.0 2
2EOC20 2NV2FW216-M2.R1.11.0276 See 60 Attachment A Pages 1-6 Page 1 of 3
McGuire Relief Request 12-MN-002 2.0 Weld #2NV2FW216-60 2.1 ASME Code Component(s) Affected Unit 2, Pipe to Pipe Weld #2NV2FW216-60, Summary Number M2.R1.11.0276.
2.2
Applicable Code Edition and Addenda
ASME Boiler and Pressure Vessel Code,Section XI, 1998 Edition through the 2000 Addenda.
2.3 Applicable Code/Licensing Requirement WCAP-14572, Rev. 1-NP-A, Supplement 2, Table 4.1-1, Examination Category R-A, Item Number R1. 11, Figure IWB-2500-8(c), 100% Volume Coverage of Examination Volume C-D-E-F.
The NRC authorized the inclusion of the Risk Informed ISI program as an acceptable alternative to the ASME Code,Section XI requirements for ASME Code Class 1 piping welds, Examination Categories B-F and B-J and ASME Code Class 2 piping welds, Examination Categories C-F-1 and C-F-2 for the third ISI interval by letter dated 06/12/2002.
2.4 Impracticality of Compliance Surface 1: Stainless Steel Pipe Surface 2: Stainless Steel Pipe Nominal Pipe Size: 2.0 inch Thickness: 0.344 inch The limitations were due to proximity of a permanent welded pipe support that did not allow complete scanning from the pipe side (Scan 2). Scanning requirements are described in 10 CFR 50.55a(b)(2)(xv)(A)(1). The aggregate coverage was calculated as follows:
0 700 shear waves obtained 76.5% coverage in one axial direction (Scan 1-pipe).
700 shear waves obtained 53.0% coverage in one axial direction (Scan 2 - pipe).
450 shear and longitudinal waves obtained 76.5% coverage in one circumferential direction (Scan 3 - clockwise).
450 shear and longitudinal waves obtained 76.5% coverage in one circumferential direction (Scan 4 - counterclockwise).
0 The aggregate coverage was calculated to be (76.5% + 53.0% + 76.5% +
76.5%)/4 = 70.625%.
Page 2 of 3
McGuire Relief Request 12-MN-002 In order to scan all of the required volume for this weld, the permanent welded pipe support would have to be redesigned to allow scanning from both sides of the weld, which is impractical. The McGuire ISI Plan allows the use of Code Case N-460, which required 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.
2.5 Proposed Alternative and Basis for Use No alternative examinations are planned for the weld during the current inspection interval. Radiography (RT) is not a desired option because RT is limited in the ability to detect expected degradation mechanisms such as thermal fatigue cracking and stress corrosion crack initiating at the pipe inside surface. Additionally, RT has not been qualified through performance demonstrations.
2.6 Duration of Proposed Alternative This request is for the duration of the third ISI interval, currently scheduled to end on 07/15/2014.
2.7 Justification for Granting Relief Ultrasonic examination of the weld for the Item Number M2.R1.11.0276 was conducted using personnel, equipment and procedures qualified in accordance with ASME Section XI, 1998 Edition with the 2000 Addenda.
The system leakage test performed each inspection period in accordance with Table IWC-2500-1, Examination category C-H requires a VT-2 visual examination to detect evidence of leakage. This test and VT-2 examination provide additional assurance of pressure boundary integrity.
In addition to the above Code required examinations (volumetric and pressure test), Reactor Building Normal Sump monitoring provides additional assurance that, in the event that leakage did occur through this weld, it would be detected and proper action taken.
Duke Energy has examined the weld/component to the maximum extent possible utilizing approved examination techniques and equipment. Based on the acceptable results for the coverage completed by the volumetric examination, the pressure testing (VT-2) examinations required by Section XI, and the leakage monitoring, it is Duke Energy's position that the combination of examinations provides a reasonable assurance of quality and safety.
Page 3 of 3
ATIACHMENT A PABE 0 0F I
Site/Unit Summary No.:
Workscope:
UTr Calibration.'
imination McGuire
/
2 M2.R1.111.0276 IS1 Procedure:
Procedure Rev.:
Work Order No.:
PDI-UT-2 E
01929201 Outage No.:
M2-20 Report No.:
UT-1 1-159 Page:
1 of 6
Code:
199812000 Addenda CatJltem:
R.A/R1.11 Location:
Rx Bldg.
Drawing No.:
MCFI.2NV216
==
Description:==
Pipe To Pipe System ID:
NV Component ID: 2NV2FW216-60 Size/Length:
NIA Thickness/Diameter:
0.344/2.01SS Limitations:
Yeg - See attached sheets (welded pipe support)
Start Time:
1613 Finish Time:
1642 instriument Settings Search Unit Cal.
Tie Dt Axial Orientated Search Unit Serial No.;
0i1MBT Serial No.:
OOOBVW ChecksC r
eInitial Cal 1245 311201 Calibration Signal Sweep Sound Path nit~l~a*
12
[
/1/211[
Reflector Amplitude %
Divlson I'----
Manufacdrer:
KRAUTKRAMER Seanufacture:
KBA Inter-Cal. -ReIlect A
d 4
D446 Delay:
6.2497 Range:
1.0 Freq-5 MHz Style:
Camp -G nr 1612 31112011/
M*t Cal/Vel:
.123 Pulser:
High ExamIAngle:
45
- of Elements: iINGL.. inter. Cal.
-l_,,,1 2
1 Damping:
1K Reject:
0%
Mode:
S#EAR Final Cat 1906 31112011 Rep. Rate:
Autohigh Freq.:
5.0 Measured Angle:
45 Couplant Filter:
Fixed Mode:
PE Wedge Style:
MSWQC Cal. Batch:
09325 Circumferential Orientated Search Unit Voltage:
Fixed Other; Fullwave Type:
ULTRAGEL II Calibration Signal Sweep Ax. Gain (dB):
36.2 Circ. Gain (dB):
52.5 Search Unit Cable Mfg.:
SONOTECH Reflector Amplitude %
Division Sound Path
=
ID Notch.8 5..4 IScreen Div.
.10 in. of Sound Path Type:
RG-174 Exam Batch:
09325 I
oc 8
A.4 Linearity Report No.:.
L-11-085 Length:
6' No. Conn.:
0 Type:
ULTRAGEL 11 Calibration Block Scan Coverage Mfg.:
SONOTECH Cal. Block No.
8279-0410 Upstream R) Downstream 2 Scan dB: 41.4 Reference Block Reference/Simulator Block Thickness 0.344 Dia.:
2.375 CW Ea CCW SD Scan dB: 52.5 Sal No.:
,7-550 Gain Signal I Sweep Cal. Blk. Temp.
72 Temp. Tool:
MCNDE40129 Exam Surface:
O.D.
Type:
ROMPAS 52.5 D
FSDH 80 i
9.6 i
.962o Comp. Temp.
67 Temp. Tool:
MCNDE40129 Surface Condition:
SmoothTye OPS2.
FDH 896 Recordable Indication(s):
Yes Q]
No 21 (If Yes, Ref'. Attached Ultrasonic Indication Report) i Results:
Accept C]
Reject &1 Info (-J.
Comments: Initial Section XI Exam Percent Of Coverage Obtained > 90%:
No Reviewed Previous Data; Na e Examiner Level l,-N Signature Date Reviewer Signature Date Ellis il, Kenneth R.
N1-3/11
~
7 Examiner Level
,I-N 3,g* re Date Site Review Signature Date
,Letter, RobertM.
0 311/2011 A
Other Level W/A Signature Data ANII Review Signature Date N/A j
~-
~
-j~
CI f,
A11ACHMEXT PACE pa.
F (,
10 Site/Unit:
McGuire I
Summary No.:
M2.R1.
Workscope:
UT Calibration-'
imination 2
11.0276 Procedure:
Procedure Rev.:
Work Order No.:
PDI4JT.2 Outage No.:
M2-20 Report No" UT-11-159 Page:
2 of 6
Sl Coda:
199812000 Addenda Cat./item; R-AIR1.11 Location:
Rx Bldg.
Drawing No.:
MCFI-ZNV2I6
==
Description:==
Pipe To Pipe System ID:
NV Component ID: 2NV2FW216-60 Size/Length:
NIA Thlckness/Diameter 0.34412.01SS Limitations:
Yed - See attached sheets (welded pipe support)
Start Time:
1630 Finish Time; 1642 Instrument Settings Search Unit Cal.
Time Date Axial Orientated Search Unit Serial No.:
011MBT Serial No-00oDC6W Checks I
Calibralln Signal
$we Pat.
Manufacturer:
KRAUTKRAMER Manufacturer.
KBA Initial Ca1 1312 3112011 Reflector Amplitude %
!PSioin Path Model:
USN-60 Size:
0.2
-Sha*pe:
oun.
Inter. Col ID Notch 81 3.9
-952 Delay:
6.7906 Range:
2.5 Frq.:
2.25. Mi Style:
Coemp -G Inter. Cal 1630 3/12011 M'1i CalVel:
.123 Pu!ser:
High Exam Angle:
.70
- of Elements: INGLE Inter.Ca. ----
Damping:
1K Reject:
0%
Mode:
SHEAR Cl_190 Rep. Rate:
Autohigh Freq.:
2.25 Measured Angle:
67 Couplant Filter.
Fixed Mode:
PE Wedge Style:
MSWQC Cal. Batch:
09325 Circumferential Orientated Search Unit Voltage:
Fixed Other~
Fuliwave Type:
ULTRAGEL A Calibration Signal Sweep Ax. Gain (dB) 61.0 Circ. Gain (dB):
NIA Search Unit Cable Mfg.:
SONOTECCH Reflector Amplitude %
Division Sound Path I
Screen Div. -
.25 in. of Sound Path Type:
RG-174 Exam Batch:
09325 N/A Linearity Report No.:
L.11.085 Length:
- 6.
No. Conn.-
0 Type:
ULTRAGEL If Calibration Block Scan Coverage Mfg.:
SONOTECH Cal. Blockc No.
8279M0410 Upstream 0 Downstream 0 Scan dB: 58.0 Reference Block ReferenuceSimulatorBlock Thickness 0.344 Die.:
2,375 CW []
CCWC] Scan dB:
NIA Gain Signal so S.
Pa, Ca.Bik. Temp.
72 Temp. Tool; MCNOE4O129 Exam Surface:
0.0 SeilN.
759 B
RfetrApiueDivision SudPt
.Type:
ROMPAS 52.6 NSDH 80 3.8
.950 Comp. Temp.
67 Temp. Tool:
MCNDE40129 Surface Condition:
Smooth Recordable Indication(s):
Yes Q No R]
(if Yes. Ref. Attached Ultrasonic Indication Report.)
Results:
Accept Q Reject Info F1 Comments: Initial Section Xl Exam Percent Of Coverage Obtained > 90%:
No Reviewed Previous Data:
No I
Exam!ner Level
-N S*
Data Reviewer e..
Signature Date Ellis ii, Kenneth R.
3 5211 Examiner.
Level II.N)
~
~
w Date Site Review Signature Date Lester, Rober M.
W1112011 Other Leval NIA Signature Data AN(I Review
~/Signature Dats
,oA r"
-S
)" i°,,,
--I.,,.-./I
/
o0
A11AtKMtE A
PAGE 3OF~
DUKE POWER COMPANY ISI LIMITATION REPORT ComponentlWeld ID:
2NV2FW216-60 Item No:
MI.R1.11.0276 remarks:
0 NO SCAN SURFACE BEAM DIRECTION Due to welded pipe support.
El LIMITED SCAN EI Z 2 I El 2 cw ccw FROM L 0
to L
+/-1.75" INCHES FROM WO CL to Beyond ANGLE:
E 0 0 45 El 60 other 700 FROM N/A DEG to N/A DEG El NO SCAN SURFACE BEAM DIRECTION E] LIMITED SCAN Eli
[] 2 1
E] 2 El cw E ccw FROM L to L INCHES FROM WO to ANGLE:
El 0 El 45 El 60 other FROM DEG to DEG El NO SCAN SURFACE BEAM DIRECTION El LIMITED SCAN E[ I El 2 El E 2 E cw Elccw FROM L to L INCHES FROM WO to ANGLE:
El 0 El 45 El 60 other FROM DEG to DEG El NO SCAN El LIMITED SCAN SURFACE S1 Erl2 BEAM DIRECTION Eli [: 2 l.cw [1 ccw UT-11-159 FROM L to L 4
INCHES FROM WO to Sketch(s) attached Z
yes
[E No ANGLE:
E] 0 l
5 [E60 other FROM DEG to DEG Prepared By:
Kenneth,lis Level:
II Date:
03101111
)f 6 I
Reviewed By:
AGGREGATE COVERAGE SHEET M2.Rl.11.0276 i 2NV2FW216-60 Angle/Scan
% Length
% Volume
% Coverage 45s - Scan 1 53.0 l0o 53.0 70" - Scan 1 47.0 so g
23.5 Aggregate Coverage 76.5.5 70O-Scan 2
- 53.0 53 10 53.0
'700-Scnf2 147.0 0.0 0.0.
Aggregate.Coverage 53.0 4.50-Scan 3 153.0..
100 o53.0 45 0 - Scan 3 47.0 50 23.5 Aggregate Coverage 76.5 450 - Scan 4 53.o100 53.0 450 - Scan 4 47.0 50I 23.5 Aggregate Coverage 76.5 Total Aggregate. Coverage = 76.5 + S3.0 +.76.5+76.5 282.5/4 = 70.6%
711 /,V//
Page. i
_of
-t,1~..
I-fl Th~
M2.RI.11.0276 Weld No. 2NV2FW 216-60 Pipe-Si Note: *Welded Pipe Suppoa 47% of Total Circ. of Weld Length.
Limitation +/- 1.75" from TD.C due to Pipe support.
See Attached Limitation sheets Axial Scan Coveraec I
Pipe-S2
- 53% of CirctutJference of S2 was not limited and Full Coverage was obtained.
- See Notes above.
Ore. Scan Coveraime 45' SOWa Pipe-S2 Pipe-S]
Ii t
Scale 1" I= "
% Coverage Calculations SI =Pipe S2 = Pipe =
=
76.5%
53%
=
76.5%
=
76.5%
= 282.5 / 4 (100% of the length x 76.5% of the volume)
(100% of the length x 53% of the volume)
(100% of the length x 76.5% of the volume)
(100% of the Jength x 76.5% of the volume) 70.6 % Aggregat1t Coverage vz~rn Inspector / Date: z
.-- g Page 5o 0
Determination of Percent Coverage for UT Examinations - Pipe Slte/Unit: McGulre 1 2
Summary No.:
M2.R1.11.0276 Workscope:
ISI Procedure:
Procedure Rev.:
Work Order No.:
PDI-UT-2 E
01029201 butage No.:
M2-20 Report No.:
UT-11-159 Page:
6 of 0
45 dec Scan 1 Scan 2 Scan 3 Scan 4
% Length X
% volume of length 1 100 =
% Length X
% volume of length /100 =
100.000
% Length X 76.500
% volume of length / 100 =
100.000
% Length X 76.500
% volume of length 1100 =
% total for Scan 1
% total for Scan 2 76.500
% total for Scan 3 76.500
% total for Scan 4 Add totals and divide by # scans =
76.500
% total for 45 deg Other den -
70 (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 I Scan 2 Scan 3 Scan 4 100.000
% Length X 76,500 100.000
% Length X 53.000
% Length X
% Length X
% volume of length / 100 =
% volume of length / 100 =
% volume of length /100 =
% volume of length / 100 =
76.500
% total for Scan 1 53.000
% 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; 70.625
% Total for complete exam Site Field Supervisor.
,e&J,(f~
Date:
Q* /0.0I "TV fll