CP-201500778, Relief Request B-11, Second Ten Year Inservice Inspection Interval from 10CFR50.55a Inspection Requirements Due to Physical Interferences (1998 Edition of ASME Code, Section XI, 2000 Addenda Second Interval Start Date: August
| ML15224B364 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/03/2015 |
| From: | Flores R, Madden F Luminant Generation Co, Luminant Power |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| CP-201500778, TXX-15118 | |
| Download: ML15224B364 (7) | |
Text
1 Rafael Flares Luminant Power Senior Vice President P 0 Box 1002 Chief Nuclear Officer 6322 North FM 56 RafaeIFlores@Lurninant.corn Glen Rose, TX 76043 Luminant254 897 5590 IF254 897 6652 CP-201500778 Ref. # 10CFR50.55a(g)(5)(iii)
TXX-15118 August 3, 2015 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
SUBJECT:
COMANCHE PEAK NUCLEAR POWER PLANT DOCKET NO. 50-446 RELIEF REQUEST B-li FOR UNIT 2 SECOND TEN YEAR INSERVICE INSPECTION INTERVAL FROM 10CFR50.55a INSPECTION REQUIREMENTS DUE TO PHYSICAL INTERFERENCES (1998 EDITION OF ASME CODE, SECTION XI, 2000 ADDENDA SECOND INTERVAL START DATE: AUGUST 3, 2004 SECOND INTERVAL END DATE: AUGUST 2, 2014)
Dear Sir or Madam:
Pursuant to 10 CFR 50.55a(g)(5)(iii)), Luminant Generation Company, LLC (Luminant Power) is submitting Relief Request B-il (see attachments) for Comanche Peak Unit 2 for the second ten year inservice inspection interval. Luminant Power has determined that certain inspection requirements of ASME Section XI are impractical due to physical interferences.
The geometry of the reactor coolant piping to the valve makes the Code required examination coverage requirements impractical. Ultrasonic Testing (UT).of the subject welds was performed during the second interval to the maximum extent practical based on design configuration restrictions. Pressure test VT-2 visual examinations were also performed with no evidence of leakage identified for the subject component. No undue risk to the public health and safety is presented by this request.
This communication contains no new licensing basis commitments regarding Comanche Peak Unit 2.
U. S. Nuclear Regulatory Commission T)(X-1 5118 Page 2 of 2 08/03/2015 Should you have any questions, please contact Mr. Jack Hicks at (254) 897-6725.
Sincerely, Luminant Generation Company LLC Rafael Flores BY: F*e]2< 2Y2*-
FrdW. Madden Director, External Affairs Attachment - Relief Request B-li for Unit 2 Second Ten Year ISI Interval from 10CFR5O.55a Inspection Requirements due to Physical Interferences - Examination Data Sheets and Sketch (3 pages) c -
Marc L. Dapas, Region IV Baiwant K. Singal, NRR Resident Inspectors, Comanche Peak Rob D. Troutt, TDLR Jack Ballard, ANII, Comanche Peak to TXX-15118 Page 1 of 2 COMANCHE PEAK NUCLEAR POWER PLANT UNIT 2 Relief Request Number B-li for Unit 2 Second 10 Year 1SI Interval From 10CFR50.55a Inspection Requirements due to Physical Interferences (Second 10-Year ISI Interval Start Date: August 3, 2004; End Date: August 2, 2014)
- 1.
ASME Code Component Affected:
Class 1 Risk-Informed Inservice Inspection (RI-ISI) piping weld as shown:
RI-ISI Piping Weld (formerly Code Category B-i)
Code Cat / Item No.
Description Weld No.
(Note)
R-A, R1.11 3" pipe to valve TCX-l-4504-i1 Note: As the methodology in EPRI TR-112657 Rev. B-A does not provide item numbers; the format in ASME Code Case N-578-1 is used for the assignment of this number.
- 2.
Applicable Code Edition and Addenda
The applicable ASME Boiler and Pressure Vessel Code (hereafter referred to as the "Code")
edition and addenda is ASME Section XI, "Rule for Inservice Inspection of Nuclear Power Plant Components," 1998 Edition, through 2000 Addenda. In addition, as required by 10CFR50.55a, ASME Section XI, 1995 Edition, 1996 Addenda is used for Appendix VIII, Performance Demonstration for Ultrasonic Examination System.
- 3.
Applicable Code Requirement
ASME Section XI, Figure IWB - 2500-8(c) 1998 Edition through 2000 Addenda requires volumetric examination of a minimum volume of the inner 1/3 t (one third of the thickness) extending into the piping base metal for a distance of 1/4" past the edge of the weld crown for NPS 4" and larger.
In a letter (NER 10580) dated October 5, 2006, from the NRC to Comanche Peak Steam Electric Station, Unit No. 2, the NRC approved in relief request A-i the extension of risk-informed inspection (RI-ISI) program for ASME Code Class 1 and 2 piping for the second interval. The methodology in EPRI TR-ii2657 Rev. B-A is used as the examination method as well as the selection of welds to be examined. The RI-ISI program requires volumetric examination of the subject weld and extends the Code required volume of the inner 1/3 t to 1/2" past the edge of the weld crown if no counterbore is present or a distance of 1/4" on either side of the weld counterbore.
The Comanche Peak Nuclear Power Plant (CPNPP) second ten-year interval Inservice Inspection Program Plan also implements Code Case N-460, which is endorsed by the NRC in revision 17 of Regulatory Guide 1.147, "Inservice Inspection Code Case Acceptability ASME Section XI, Division 1." Code Case N-460 states in part, when the entire examination volume or area cannot be examined due to interference by another component or part geometry, a reduction in examination coverage on any Class 1 or Class 2 weld may be accepted provided the reduction coverage for that weld is less than 10 percent.
NRC Information Notice (IN) 98-42, "Implementation of i0CFR50.55a(g) Inservice Inspection Requirements," termed a reduction in coverage of less than 10 percent to be "essentially 100 percent. "IN 98-42 states in part, 'The NRC has adopted and further refined the definition of to TXX-1 5118 Page 2 of 2 COMANCHE PEAK NUCLEAR POWER PLANT UNIT 2 Relief Request Number B-li for Unit 2 Second 10 Year 1SI Interval From 10CFR50.55a Inspection Requirements due to Physical Interferences (Second 10-Year 1SI Interval Start Date: August 3, 2004; End Date: August 2, 2014)
"essentially 100 percent" to mean 'greater than 90 percent"... has been applied to all examinations of welds or other areas required by ASME Section XI.'
- 4.
Impracticality of Compliance:
The geometry of the subject component limits the examination to one side, due to the valve welded to the pipe. Volumetric examinations were performed with shear wave search units with nominal angles of 45, 60 and 70 degrees. Contour could not be taken at 0 degrees due to clamp obstruction. 70 degrees was used because of single size access. Only 50% examination coverage was achieved due to valve/pipe configuration (see Attachment 2). The examinations were conducted in accordance with procedure TX-ISI-302, "Ultrasonic Examination of Austenitic Piping Welds."
- 5.
Burden caused by Compliance:
The design configuration restrictions of the subject components make the Code required examination coverage requirements for the weld volume impractical. Plant modifications or replacement of components designed to allow for complete coverage would be needed to meet the Code Requirements. This would cause considerable burden to CPNPP.
- 6.
Proposed Alternative and Basis for Use:
Proposed Alternative:
The following alternatives are proposed in lieu of the required examination coverage of essentially 100 percent:
- 1.
Ultrasonic testing (UT) of the subject component weld was performed to the maximum extent practical during the second ten-year interval.
- 2.
Pressure test VT-2 visual examinations were performed, as required by Code Category B-F, during the second ten-year interval. No evidence of leakage was identified for this component.
Basis for use:
The basis for use of this alternative is that it provides the best examination coverage practical within the limitations of the current configuration. Based on the percentage of the examination volume completed and the lack of any indications identified, there is a high level of confidence in the continued structural integrity of the weld. CPNPP believes that there is no undue risk to the public health and safety presented by this request.
- 7.
Duration of Proposed Alternative:
The second ten-year ISI interval for Unit 2 began on August 3, 2004 and ended on August 2, 2014.
- 8.
Precedents:
None
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Eln~l C Unny Calibration Data Sheet r5tO Plant,/ Unit COMANCHE PEAK UNIT 2 Company WesDyne International Camp / System RC PRESSURIZER RELIEF Procedure No.
TX-ISI-302 Rev / Chng..No, 3/! N/A Cal. Block No.
PI -03 Cal. Black" Temp.
- 86 =F Thermometer SIN
TU - 2353 Size 3"
Sch.
1601.438"
'T" Ferritic jrj Austenti~c Each Major CRT Div. =
1240" 1.1650" Cal. Direction:
m~Axial DJ Circ, EJ Both Scan Area:
L.. o Weld I*J i to Weld Calibr~ation Reference Check:
Data Sheet #
12 UT-037A Page L
of Cal. Checks Time InitialCalib.
1358 Initial Calib. Date 04114/111 Intermediate 1545 intermediate 1555 Final Calib.
1646 Final Calib. Dale 04/14/11 Couplant Search Unit #1 Manufacture:
KRAUTKRAMER Serial No.:
SB0599 Na. of Elements:
1 Size:,
.25" Sh.i~*ape:
ROUND
- Freq, 2.25 MHz Style:
COMP G Exam Angle:
45 Mode:
SHEAR Measured Angle:
45" Wedge Style:
NON INTEGRAL Search Unit Cable Search Unit #2 Manufacture:
KRAUTKRAMER Serial No.:
5B0756 No. of Elements:
1 Size:
.25 "
Shape ROUND Freq.
2-25 MHz Style:
COMP G Exam Axgle:
60" Mode:
SHEAR Measured Angle:
58 Wedge Style:
NON INTEGRAL Search Unit Cable Rompas Block: #
104884 Ref. Reflector:
SOH Type:
ULTRAGEL II Batch:
06225 Access Recordable Indications Exam
- Sens, Type:
Length:
RG 174 6'
NO.LafCon.:
0 Type:
Length:
RG 1-74.
6' No. of Can.:0 Examination Area I Weld CD
--H
-- I C,
45*-34 dB TCX-1-4504 11 DWNSTR
___X fl0"-36 dB Remarks-/ Reason far Incomplete Scan(s)
COMPONENT TEMP:
82 "F 60" EXAM PERFORMED TO MAXIMIZE COVERAGE OF THE REQUIRED VOLUME 50% EXAMINATION COVERAGE ACHIEVED DUE TO VALVE/IPPE CONFIGURATION.
Instrument Settings Make I Model: KRAUTKRAMER USN 60SW Serial No.:
105205 Probe Delay:. 4.6112 Range:
1.240 M'tl CallI Vel:
.1235 Pulser: SQUARE Damping:,
500 0 Reject:.
0%
PRF:
AUTOHIGH Freq:
2.25 MHz Filter:
FIXED Mode:
P/E Rectify:
FRJLLWAVE Voltage:
450 Pulse Width:
220ns Reference Sensitivity (Sens.)
Axial:
22dB Circ:
N/A SDH Sensitivity:
22 dB CRT Dlivi/SDH-B.2 Instrument Settings Make/IModel: KRAUTKRAMER USN 60SW Serial No.:
105205 Probe Delay:
5.30g7 Range:
1.650 M'il CallI Vel:
.1.235 Pulser: SQUARE Damping:
500 C) Reject:
0%
PRF: AUTOHIGH Freq:
2:25 MHz Filter:
FIXED Mode:
PIE Rectify:
FULLWAVE Voltage:
450 Pulse Width:
220ns ReferenceSensitivIty (Sens.)
Axial:
36diB Circ:
N/A SDH Sensitivity:
36 dB CRT Div./SDH
8.9 Examiners
DANIEL SANCHEZ,',"-.-f~i-1't'*et II Date N/A
,1E" RFVIF-WElER DAE l.,
f..,,l _
t/,.,.
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ln*n Plant / Unit COMANCHE PEAK UNIT 2 Company Wes~yne International Camp I System RC PRESSURIZER RELIEF Procedure No.
TX-iSI-302 Rev /IChng. No.
3/lNIA Cal. BlockNo.
PDI - 03 Cal. Block Temp.
86 "F Thermometer SIN; TU -2363 Size 3"
Sch.
1601/.438" "7"
f1Ferrilic r1Auslenitic Each Major CRT Div. =
.2640" Cal. Direction:
r*'Axial DJ Circ. r']Both Scan-Area:
.... J t Weld IBT I I to Weld Calibration Reference Check:
Calibration Data Sheet, so&
Data Sheet #
12 UT-037B Page 2.-
of 3
Cal. Checks Time Initial Calib.
1405 Initial Calib. Date 04114/11 Intermediate 1604 Intermediate NlA Final Catib.
1647 Final Calib. Date 04114111 Couplant
/
I
/
f t
Rompas Block: #
104884 Re f. Reflector:
SDH
.Type:
ULTRAGEL II Batch:
05225 Access Recordable Indications Exam Sans.
Examination 'Area I-Weld TCX-1-4504 11
,DWNSTR
___X 50 dB Search UnIt #1 Search nit #2 Manufacture:
KRAUTKRAMER Manufacture:
/
Serial No.:
00YHV0 Sedial No,:
NO. of Elements:
1 No. of Elements:
Size:
.25 "
Shape: ROUND Size:
Shape_____
.Freq.
2.25 MHz Style; COMP G Freq.
_______tyle:______
Exam Angle:
70 ° Mode:
SHEAW Exam Angie:
-Mode:'
Measured Angle:
70"° Measured-Angle; Wedge-Style:
N*ON iNTEGRAL
'Wedge Style:/
Search Unit Cable Se rch Unit Cable Type:
RG 174 Type:
Ii/
Length:
6' No. of Con.:
0 Length: "
07
.Ro"f Con.:
Instrument Settings
/nstrument Settings Make / Model: KRAUTKRAMER USN 60SW Make /M Mdel:__________
Serial No;:
10505Serial N Probe Delay: v.87Rne
.4 Probe D.lay:
Rne M'tl Cal i VeI:
.13 Pulser: SQU"A"RE MuI Call/Vel:
Pulser:____
Damping:
500'('-Reject:
0 Dampi g:
0 Reject:
PRF:
AUTOHIGH Freq:
2.25 MHz PRF:/ _____Freq:____
Filter:
FIXED Mode:
PI Filter! ______Mode:. __-
Rectify:
UL
'AEVoltage: 45 Rec fy:
_____Voltage:
Pulse Width:--
220ns Pul~e Width:-"
Reference Sensiiiy(Sn.
Reerence Sensiiiy(ei.
Axial:
50 dB Ciro:
N/A.
A lial: ______Circ:_____
- SDH Sensitivity:
42,7 dB
..- I Sensitivity:
CRT Div./SDH
- 3.
CRT Div./SDH 0,
0 2'
ICD 0
-- I Remarks I Reason for Incomplete Scan(s)
COMPONENT TEMP:
82 "F 70" UUE TO SINGLE SIDE ACCESS.
50% EXAMINATION COVERAGE ACHIEVED DUE TO VALVEJPIPE CONFIGURATION NIA Level N/A Date Reviewers:
Further'Evaluatlon Requir,=
N4/1A1 id
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_~N
- EVEWE /DAE t--*_
//1*
IIIf I SReVI IQ 4 1 --
to TXX(-1 5118 3 of 3 N--
SYSTEM nr:PAE.su~ZRRnEL*
WE~LD NO 1
WALL THICKNESS PROFILE SHEET iIUT EXAMINATION DATA SHEET NO, 12 UT-fl7
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CROWN HEIGHT:
.05" DIAMETER CROWN WIDTH
.,______" __WELD LENGTH 0 718" LONGSE.AM:
NIA PROFILE AREA VALVE PIPE REMARK. CONTOUR CAN NOT BE TAKEN AT 0* DUE TO CLAMP OBSTRUCTION.
EXAMINER*:
EXAMINER :
,JERNSJ JERMAN LEVEL II DATE 4114/111 LEVEL II DATE 0411411 I