CP-201500779, Relief Request B-15, 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..

Relief Request B-15, 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..

ML15224B365
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-201500779, TXX-15119
Download: ML15224B365 (8)

Text

Rafael Flares Luminant Power Senior Vice President P0O Box 1002

& Chief Nuclear Officer 6322 North FM 56 Rafael.Flores@ Luminant.com Glen Rose, TX 76043 Luminant 24959 F254 897 6652 CP-201500779 Ref. # 10CFR50.55a(g)(5)(iii)

TXX-15 119 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-15 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 (Lutminant Power) is submitting Relief Request B-15 (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 vessel closure head ring to disc weld makes the Code required examination coverage requirements impractical. 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 TXX-151 19 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: ,6Jd J"2 *x2,..

/Fred W. Madden /'

Director, External Affairs - Relief Request B-i5 for Unit 2 Second Ten Year ISI Interval from 10CFR50.55a Inspection Requirements due to Physical Interferences - Examination Data Sheets and Sketches c - Marc L. Dapas, Region IV Baiwant K. Singal, NRR Resident Inspectors, Comanche Peak Rob D. Troutt, TDLR Jack Ballard, ANTI, Comanche Peak to TXX-15119 Page 1 of 2 COMANCHE PEAK NUCLEAR POWER PLANT UNIT 2 Relief Request Number B-15 for Unit 2 Second 10 Year ISI 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:

ASME Code Class: Code Class 1

References:

ASME Section XI, Table 1WB-2500-1 and IWB-3510 Examination Category: B-A Item Number: B1.21

Description:

Code required examination coverage for the weld volume is impractical Component: Reactor Vessel Head to Disc Weld Component Number: TCX-1-1300-2

2. Applicable Code Edition and Addenda:

The applicable ASME Boiler and Pressure Vessel Code (hereafter referred to as the "Code") is the 1998 Edition through 2000 Addenda of the ASME Section XI Boiler and Pressure Vessel Code.

3. Applicable Code Requirement:

The 1998 Edition through 2000 Addenda of the ASME Section XI Boiler and Pressure Vessel Code, Table IWB-2500-1 and IWB-3510 requires volumetric examination of reactor vessel head to disc weld (TCX-1-1300-2).

The Comanche Peak Nuclear Power Plant (CPNPP) second ten-year interval Inspection Program Plan also implements Code Case N-4.60, 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-4.60 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 10 CFR 50.55a(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 "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 examination of the subject component weld is limited by the presence of an insulation support shroud assembly (See attached sketch). The examinations were conducted in accordance with procedure TX-ISI-306, "Manual Ultrasonic Examination of Reactor Pressure Vessel Weds". 600 scans were used to achieve the weld volume obtained. As shown on the attached examination data sheets, only 68% of the required examination volume was achieved (see attachment 2).

to TXX-15119 Page 2 of 2 COMANCHE PEAK NUCLEAR POWER PLANT UNIT 2 Relief Request Number B-15 for Unit 2 Second 10 Year ISI Interval From 10CFR50.551 Inspection Requirements due to Physical Interferences (Second 10-Year ISI Interval Start Date: August 3, 2004; End Date: August 2, 2014)

5. Burden caused by Compliance:

The design configuration restrictions of the subject component makes the Code required examination coverage requirements for the weld volume impractical. Plant modifications or replacements 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. No recordable indications were noted, in the areas examined.

2. Pressure test VT-2 visual examinations were performed, as required by Code Category B-P, 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

UT Calibratio .amination K)

Luminant SitelUnit: CPNPP I 2 Procedure: TX-ISI-306 Outage No.: .2RF14 Summary No.: 003200 Procedure Rev.: Report No.: U1"-2014.102 3

Workscope: ISI Work Order No.: 4517083* Page:* 1 of 4 Code: ASME Sec. XI 1998 Ed.12000 Add. Catl/tem: B-AIB1.21 Location: 2,IS1A, RB, 072' Drawing No.: TCX-1-1300

Description:

RV CLOSURE HEAD RING TO DISC WELD System ID: RC Component ID: "[CX-1 -t300.2 .Size/Length: 1.5" 1422.95" Thickness/Diameter: 7.3"I 1134.63" Limitations: SINGLE-SIDED EXAMINATION Start Time: 1005 Finish Time: 1220 Instrument Settings Search UnIt Cal,. Time Date Axial Orien!tated Search Unit Serial No.; 1.05204 Serial No.: 06 177 Checks -Calibration Signal Sweep Sound Path ManufaCturer: GEIT Manufacturer: RTD Initial Cal." 0830 41712014 Reflector Amplitude  %. Division Model.; USN 6OSW Linearity:. L-2014-006 SIze:. 2(24 X 42)am Modal: TRLA Inter. Cal., - 14T SDH 60 4.1 4.051 Delay: 14.6704 Range: 10.00,' Freq.: 2.0 MHz Center Freq.: 1.82 MHz Inlet.'Cal. 1045 41712014 NIA_____

SInler. Cal. _____ NIA_____

+M'tICalNel: 0.2320 Pulser Type: Square Exam Angle: 60 Squint Angie: 5 Final Cal. 1240 47/72014 NIA_____ ____

Damping: 500 Ohms Reject: 0% Measured Angle: 59' Mode: Longitudinal Couplant N/A _____ _____ ____

PRF: Auto High SU Freq.: 2.0 MHz Exit Point 1.1" "# ol *lements: 2

- CaL.Batch: 11425 Circumferential Orientated'Search Unit Frequency: 2.0 MHz Rectify:" Fullwave' Conlig.: Side by Side. Focus: 125 mm Type: Ultragel II Calibration +Signal ISweep So Voltage; 450 Pulse Width: 250 Shape: Rectangular; Contour: N/A Mfg.: Sonotrace Reflector Amplitude % Division ound Path Wedge Style; Integral Exam Batch:.. 112 N/A _____ ________

Ax. Gain (dB): 46.4 Circ. Gain (dB): N/A Search Unit Cable Type: Ultragel II N/A_____

10 Screen Div. = 1 in. of Sound Path Type: RG-174 Length: 25"_.No. Conn.: "IMf. Sonotrace N/A _____ ________

Calibration Block Scan Coverage Mi. _________ NIA ______ ____

Cal..Block No. TBX-29 Upstream r] Downstream l-3 Scan dB: 50.4 Reference Block Reference/Slmulator Block

-- Gain= Signal ISweep Isound Path Thickness 8.60 Dia.: 0 CWlv-' CCWlV-' Scan dB: 60,4 Serial No.: 104076' dB Reflector IAmplitude"% 'DivisionI Cal. Blk. Temp. 71 Temp. Tool: 106855 Exam Surface: 00 T-"lype: Rompas Block CiS 45.4 2BW t 90 3.9 1 3.806 Comp. Temp* 7-3 Temp. Tool: 106855 Surface Condition: GroundNA Recordable Indication(s): Yes No ]  :(If'Yes, Ref. Attached Ultrasonic Indication Report.) NIA.,

Comments: ZONE I CALIBRATION.

Results: Accept IV! Reject [3' Info [] 68% CODE COVERAGE ACHIEVED.

Percent Of Coverage Obtained > 90%: No Reviewed.Previous.Data: Yes Examiner Level IlI.PDI Sinaure Date Reviewer n -a ' / Date

'Jennings, Jason' -- 4/7/20;14 Sabo, Steve . '(IL/

Examiner Level NIA Signature ' -Date Site Review " 5" S-*tu a / , Date Other Level N/A Signature Date ANtI Review Sin*r ~ Dt N/,A B+allard..Jack AII+.4

L UTCahibratiohamination Luminant SitelUnit: CPNPP 1i Procedure: TX-ISl-3O6 Outage No.: 2RF14 Summary No.: 003200 Procedure Rev.:: 3 Report No.: UT-2014-102 Workscope: ISI Work Order No.: 4517083 Page: 2 of 4 Code: ASME Sec. XI 1998 Ed./2000 Add. Cat./Item: B-A/B1.21 Location: 2-161A, RB, 572 Drawing No.: TCX-1 -1 300

Description:

RV CLOSURE HEAD RING TO DISC WELD System ID: RC Component ID: TCX-1-t300.2 Size/Length: 1.5" I 422.95" Thickness/Diameter: 7.3" /134.63" Limitations: SINGLE-SIDED EXAMINATION Start Time: 1005 Finish Time: 1220 Instrument Settings Search Unit Cal. Time Date Axial orientated Search Unit Serial No.: 105204 Serial No.: 06 177 Checks

_______________________ - -Calibration Signal Sweep Sound Path Manufacturer: GEIT Manufacturer:. RTD InitiaI Cal. 0820 41712014 Reflector Amp~lude % Division>

Model: USN 60SW LUnearity: L-2014-006 Size: 2(24 X 42)ram Model: TRLA Inter. Cal. -ID NOTCH 80 8.7 17.27

• Delay: 14.6784 Range: 20.00" Freq.: 2.0 MHz Center Freq.: 1.82 MHz Inter. Cal. 1000 4/712014 N/A ____

M'tI Cal/Vel: 0.2320 Pulser Type: Square Exam Angle: 80 Squint Angle: 5 Finter Cal. 4/12014_NI N24A Damping: 500 Ohms Reject: 0% Measured Angle: 59 Mode: Longitudinal .i.a.Ca. 125 4721 /

PRF: Auto High SU Freq.; 2.0 MHz Exit Point 1.1" # of Elements: 2Couplant N/A ____ ..

______2 CaL Batch: 11425 Circumferential Orientated Search Unit Frequency: 2.0 MHz Reclifyr: Fullwave Config.: Side by Side Focus: 125 mm

• Voltage: 450 Pulse Width: 250 hae RctnurCoor: NA Type: Ultragel I1 Calibration Signal Sweep SudPt Shp:RcaglrCotu: NA Mg: Sonotrace Reflector Amplitude.% Division SudPt Ax. Gain (dB): 74.9 Ciro. Gain (dB): N/A Wde Stye: r interable Exam Batch: 11425 N/A 1 Type: Ultragel II NA2 10 Screen Div. = 20 in. of Sound Path Type: RG-174 Length: 25' No. Conn.: I N/Ag.____S__notrace_

Calibration Block Scan Coverage - fg: ontaeN/A _____

Cal. Block No. TBX-29 Upstream *] Downstream ] Scan dB: 74.9 Reference Block Reference/SImulator Block C Th c n s 0S 86 i. ra o. 0 8 5Gain ISignal I Sweep S u dP t Thcns

.0 Da:0CWlV-- CCW*J Scan dB: 74.9 SerialN.____4_7 dB IReflector Amplitude % IDivision SudPt Cal. Blk. Temp. 7'1 Temp. Tool: 106855 Exam Surface: 00 Type: Rompas Block C/S 46.4 2" BW 90 1.9 3.866 Camp. Temp. 7_3 Temp. Toot: 108855 Surface Condition: Ground N/Al Recordable Indlcatlon(s): Yes El No [] (If Yes, Ref. Attached Ultrasonic Indication Report.) N/A Results: Accept [] Reject [] Info [] Comments: ZONE 2 CALIBRATION.

68% CODE COVERAGE ACHIEVED.

Percent Of Coverage Obtained > 90%: No Reviewed Previous Data: Yes Examiner Level tI-PDI Sinature Date Reviewer ne,_

ateN' Jennings, Jason ....... -/ r,.tf/ '-/01I //!L Examiner Level N/A Signature Date Site Review ig tu**,*,3

/ / /Date Other Level N/A Signature Dale ANII Review ' Signtre" / / Date

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