CP-201000889, Relief Request No. C-6 for Unit 1 Second 10 Year ISI Interval from 10 CFR 50.55a Inspection Requirements Due to Physical Interferences (Second Interval Start Date: August 13, 2000)

Relief Request No. C-6 for Unit 1 Second 10 Year ISI Interval from 10 CFR 50.55a Inspection Requirements Due to Physical Interferences (Second Interval Start Date: August 13, 2000)

ML103560593
Person / Time
Site:	Comanche Peak
Issue date:	12/15/2010
From:	Madden F Luminant Power, Luminant Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CP-201000889, TXX-10091
Download: ML103560593 (10)

Text

Rafael Flores Luminant Power Senior Vice President P 0 Box 1002 011 & Chief Nuclear Officer 6322 North FM 56 rafael.flores@Luminant.com Glen Rose, TX 76043 Luminant 2548975550 C 817 559 0403 F 254 897 6652 CP-201000889 Ref. # 10 CFR'50.55a(g)(5)(iii)

Log # TXX-10091 December 15, 2010 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK NUCLEAR POWER PLANT DOCKET NO. 50-445 RELIEF REQUEST NO. C-6 FOR THE UNIT 1 SECOND 10 YEAR ISI INTERVAL FROM 10 CFR 50.55a INSPECTION REQUIREMENTS DUE TO PHYSICAL INTERFERENCES (SECOND INTERVAL START DATE: AUGUST 13, 2000)

Dear Sir or Madam:

Pursuant to 10 CFR 50.55a(g)(5)(iii), Luminant Generation Company, LLC (Luminant Power) is submitting Relief Request C-6 (see attachment) for Comanche Peak Unit 1 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 excess letdown heat exchanger makes the Code required examination coverage requirements impractical. Ultrasonic Testing (UT) of the subject weld 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 1.

Should you have any questions, please contact Mr. Jack Hicks at (254)897-6725.

Sincerely, Luminant Generation Company LLC Rafael Flores By:

BFred W. Madden Director, Oversight & Regulatory Affairs A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway Comanche Peak

• Diablo Canyon- PaloVerde. San Onofre. South Texas Project Wolf Creek

U. S. Nuclear Regulatory Commission TXX-10091 Page 2 12/15/2010 Attachments - 1. Relief Request C-6 for Unit 1 Relief Request for Weld Examination Coverage for the Excess Letdown Heat Exchanger

2. Drawing and Inspection Sheets for Excess Letdown Heat Exchanger c- E. E. Collins, Region IV B. K. Singal, NRR Resident Inspectors, Comanche Peak Brian Welch, ANII, Comanche Peak Anthony Jones, TDLR to TXX- 10091 Page 1 of 3 10CFR 50.55a Request Number C-6 Relief Requested In Accordance with 10CFR50.55a(g)(5)(iii)

- Inservice Inspection Impracticality -

1. ASME Code Component Affected:

Class 2 Excess Letdown Heat Exchanger (TBX-CSAHEL-01) Head Circumferential Weld Code Cat / Item No. Description Weld No.

C-A / C1.20 Excess Letdown HX Head to Flange Weld TBX-2-1 110-1

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, "Rules for Inservice Inspection of Nuclear Power Plant Components," 1998 Edition through 2000 Addenda.

3. Applicable Code Requirement

ASME Section XI, Figure IWC-2500-1 (a) 1998 Edition through 2000 Addenda, requires a minimum volumetric examination of the weld volume extending 1/2" into the base metal on the vessel and flange sides for the head circumferential weld (Code Item C1.20).

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 15 of Regulatory Guide 1.147, "Inservice Inspection Code Case Acceptability ASME Section XI, Division 1." Code Case N-460 states, in part, whe'n 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 10CFR50.55a(g) Inservice Inspection Requirements," termed a reduction in coverage of less than 10 percent to be "essentiallyýi 00 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."

to TXX-10091 Page 2 of 3 10CFR50.55a Request Number C-6

4. Impracticality of Compliance:

The examination of the subject component weld is limited by the configuration of the flange design and the location of two-four inch and two-three inch nozzles on the tube side of the heat exchanger. As shown on the Attachment 2, the proximity of the nozzles limits the perpendicular scans on the tube side. Parallel scans were limited on the flange side of the weld. This yields a composite coverage of 50% of the required examination volume.

The examinations were conducted in accordance with procedure TX-ISI-214,"Ultrasonic Examination Procedure for Welds in Piping Systems and Vessels." Straight beam (00) and angle beams (450 shear and 600 longitudinal) scans were used to achieve the weld volume obtained.

5. Burden caused by Compliance:

The design configuration restrictions of the 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 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 C-H, 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.

to TXX-10091 Page 3 of 3 10CFR50.55a Request Number C-6

7. Duration of Proposed Alternative:

The second ten-year ISI interval for Unit 1 began on August 13, 2000 and ended on August 12, 2010.

8. Precedents:

Relief Request C-9 was submitted in letter TXX-98170 from CPNPP to USNRC in July 22, 1998 for the first ten-year interval for Unit 1.

PDI Calibration Data Sheet CD 0)

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.~CP Plant / Unit COMANCHE PEAK UNIT I Data Sheet # 13 UT-23 so 80 Company WESDYNE Page I of <_ C)

Comp / System CHEM. & VOL. CONTROL 60 60 Procedure No. TX-ISI-214 Cal. Checks Time (0 Rev / Chng. No. 4/NA Initial Calib. 0900 40 0 2 4 6T 40 Cal. Block No. TBX-8 Initial Calib. Date 10/3/08 Cal. Block Temp 880 Comp. Temp 770 Intermediate N/A 20 20 Therm S/N: TU-2367 Intermediate NIA Size 8" Sch. 140/ .812 "T" Final Calib. 1120 W* Ferritic FiXlAustenitic Final Calib. Date 10/3/08 0 2 .4 6 a 2 4 6 a 10 CRT Div. 2.5" 10 CRT Div. =

Cal. Direction: X Axial Circ. Both Couplant Scan Area: _ to Weld Type: ULTRA GEL I1 Search Unit #1 Manufacturer:Search Unit #2 to Weld Batch: 06225 Manufacturer: KBA Serial No.: 01BXY3 Freq.: 2.25 MHz Serial No.: Freq.:

Recordable Size: .5" Shape: ROUND Size: Shape:

Access __Indications Exam Sens. Exam Angle: 00 Model: GAMMA Exam Angle: Model:

Examination Area / Weld Yes No Geom Measured Angle: 00 Measured Angle:

TBX-2-1110 1 CAP -SIDE _ 14.5 dB Wedge Style: N/A Wedge Style: N Search Unit Cable Search Unit C61e RG 174 Type:/

Type:

Remarks / Reason for Incomplete Scan(s) Length: 12' No. of Connectors: 0 Length: No. of onnectors:

Instrument Settings / Instrumen Settings 50% NOT EXAMINED Make / Model: KBA/USN 52R Make / Model:

Serial No.: SAP 101866 Serial No.: SAP SEE PREVIOUS DATA Dis.Delay: 0.000 ps Range: 2.5" Dis.Delay: / s Range:

Prb.Delay: 0.000 ps Pwidth: N/A Prb.Delay: s Pwidth:

M'tl Cal/Vel: .2256 ps Pulser: N/A M'tl Cal/Vel: s Pulser:

Damping: 1000 Q Reject: 0% Damping: 0 Reject:

Rep. Rate: AUTOHIGH Freq.: 2-8 MHz Rep. Rate. AUTOHIGH Freq.:

Filter: N/A Mode: FIXED Filter: / _" _ Mode:

Voltage: N/A Rectify: FULLWAVE Voltag: ' Rectify: FULLWAVE Examiner: JOE FUNYAK Level II Date 10/3/08 Reference Sensitivity (Sens.) Ref ence Sensitivity (Sens.)

Axial: 14.5 dB Circ: N//A Ax 'l: Circ:

Examiner: N/A Level N/A Date N/A SDH Sensitivity: N/A H Sensitivity:

Further Evaluation Required? E] Yes [] No Reviewer!I Date ICIe./'/OF Reviewer Date l FA $

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PDI Calibration Data Sheet C0 0)

CD Cn :3 Plant / Unit COMANCHE PEAK UNIT 1 Data Sheet # 13 UT-23-A 80 B0 Company WESDYNE Page 2 of e 0 60 Comp / System CHEM. & VOL. CONTROL C)

Procedure No. TX-ISI-214 Cal. Checks Time 0R Rev/ Chng. No. 4/NA Initial Calib. 0910 40 40 Cal. Block No. TBX-8 Initial Calib. Date 1013/08 Cal. Block Temp 85' Comp. Temp 770 Intermediate N/A 20 20 Therm S/N: TU-2367 Intermediate N/A Size 8" Sch. 140/ .812 "T" Final Calib. 1115 D- Ferritic F--]Austenitic Final Calib. Date 10/3/08 0 2 10 CRT Div.

4 6 3.5" 8 0 2 10 CRT Div.

4 6 8 Cal. Direction: Axial Circ. X Both Coupiant

/

Scan Area: -L to Weld Type: ULTRA GEL II Search Unit #1

=]to Weld Batch: 06225 Manufacturer: KBA Manufacturer:

Serial No.: 0096VP Freq.: 1.5 MHz Serial No.: _

Recordable Size: 5375" Shape: ROUND Size: Shape:

Access Indications Exam Sens. Exam Angle: 450 Model: COMP-G Exam Angle: Model:

Examination Area / Weld Yes No Geom Measured Angle: 450 Measured Angle:

TBX-2-1 110 1 CAP -SIDE X 35.3/40.6 dB Wedge Style: NON INTEGRAL Wedge Style: _

Search Unit Cable Search Unit CQ Type: RG 174 Type:

Length: 12" No. of Connectors: 0 Length:

Remarks / Reason for Incomplete Scan(s) Instrument Settings Instrumen Settin!

Model:

50% NOT EXAMINED Make / Model: KBA/USN 52R Make / I Serial No.: SAP 101866 Serial No.: / SAF SEE PREVIOUS DATA Dis.Delay: 0.000 ps Range: 3.50" Dis.Dela *y: ps Range Prb.Delay: 4.921 ps Pwidth: N/A Prb.Delz ay: / ps Pwidtv M'tl Cal/Vel: 1.253 ps Pulser: N/A M'tI Call VVel: s Pulser Damping: 1000 Q Reject: 0% Dampin( g: _ Q

.. Reject Rep. Rate: AUTOHIGH Freq.: 2-8 MHz Rep. Ra te .AUTOHIGH Freq.:

Filter: N/A Mode: FIXED Filter: / __-Mode:

Voltage: N/A Rectify: FULLWAVE Volta Rectifý Examiner: JOE FUNYAK Level II Date 10/3/08 Reference Sensitivity (Sens.) Ref enlce Sensitivity (Sens.)

Examiner:

Reviewer/Oate Reviewer I Dare ~

NIA Level

/a~/.,4 10Z':

/~ 1~ F N/A Date N/A Axial:

SDH Sensitivity:

25.3 dB Further Evaluation Required?

ReviewerlDate R-lewer I Dale Circ:

N/A Fl Yes 30.6 dB

£*. No

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Ax* :

Ii H Se nsitivity:t

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Circ:

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PDI Calibration Data Sheet CD 0 0 -CD Plant / Unit COMANCHE PEAK UNIT 1 Data Sheet# 13 UT-23-B 80 Company WESDYNE Page of -S 0 Comp / System CHEM. & VOL. CONTROL 60 Procedure No. TX-ISI-214 Cal. Checks Time C)

C0 Rev / Chng. No. 4/NA Initial Calib. 0920 40 Cal. Block No. TBX-8 Initial Calib. Date 10/3/08 Cal. Block Temp 850 Comp. Temp 77° Intermediate N/A 20 Therm SIN: TU-2367 Intermediate N/A I Size 8"' Sch. 140/.812 "T" Final Calib.

Final Calib. Date 1112 10/3/08 0 I

2

-I Li 6

[-] Ferritic F-]Austenitic 0 2 4 6 8 4 8 10 CRT Div.= 2.903" 10 CRT Div. =

Cal. Direction: X Axial Circ. Both Couplant Scan Area: - to Weld Type: ULTRA GEL II Search Unit #1 Search Unit #2 Manufacturer:" //

= to Weld Batch: 06225 Manufacturer: RTD Serial No.: 08-374 Freq.: 2.0 MHz Serial No.: Freq.:_/

Size: 2 (7X10) Shape: RECT. Size: - Sh-ape:

Exam Sens. Exam Angle: 600 Model: TRLA Exam Angle: Model:

Measured Angle: 600 Measured Angle:

73.1 dB Wedge Style: INTEGRAL Wedge Style: NA Search Unit Cable Search Unit CilAe Type: RG 174 Type:

Length: 12" No. of Connectors: 0 Length: No. of onnectors:

Instrument Settings *InstrumenISettings 50% r*4OT EXAMINED Make / Model: KBAIUSN 52R Make / Model.:

Serial No.: SAP 101866 Serial No.: SAP SEE PREVIOUS DATA Dis.Delay: 0.000 ps Range: 2.903" Dis.Delay: s Range:

ID ROLL AT 30% SCREEN HEIGHT AT REF. dB Prb.Delay: 7.78 ps Pwidth: N/A Prb.Delay: s Pwidth:

M'tl Cal/Veh .2306 ps Pulser: N/A M'tl CalNel: s Pulser:

Damping: 1000 Q) Reject: 0% Damping: 0) Reject:

Rep. Rate: AUTOHIGH Freq.: 2-8 MHz Rep. Rate. AUTOHIGH Freq.:

Filter: . __"-- - Mode:

Filter: N/A Mode: FIXED Voltage: N/A Rectify: FULLWAVE Volta : _-- - Rectify: FULLWAVE Examiner: JOE FUNYAK Level 11 Da te 10/3/08 Reference Sensitivity (Sens.) Ref ence Sensitivity (Sens.)

Axial: 73.1 dB Circ: N/A Ax' : _Circ:

Examiner: N/A Level N/A Da te N/A SDH Sensitivity: N/A H Sensitivity:-

Further Evaluation Required? E] Yes .X No Reviewer IDate

-, Dale o.,.

Reviewer.,

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to TXX-10091 Page 4 of 5 i WESTINGHOUSE NUCLEAR SERVICES DIVISION REPORT NO. UT-98-129 INSPECTION SERVICES PAGE OF 3 PROFILE OF THE EMAMINATION V Eý,ý y 5-PLANT Comanche Peak UNIT I SKETCH TBX-2-1110 Rev, 1 SYST/COMP CHEMICAL & VOLUME CONTROL PROCEDURE TX4SI-214 Rev. 2 FC N/A EXAMINER Morini, George LEVEL II DATE 4110198 EXAMINER NIA LEVEL NIA DATE COMPONENT ID TBX-2-1110-1 COMMENTSISKETCH/DETAILS

(,6'LI S-TDE S F) A j C, D:C)9P

.. 0 0 Iroj I.

TU ELECTRIC REVIEW I DATE DeBonis, John to TXX-10091 Page 5 of 5 m.m REPORT NO. 'UT-98-129

- - WESTINGHOUSE NUCLEAR SERVICES DIVISION *PAGE ..- OF .

~ oe 4 LIMITATION TO EXAMINATION PLANT Conaanche Peak UNIT 1 SKETCH TBX-2-111O Rev. 1 SYST/COMP CHE* AICAL & VOLU ME CONTROL PROCEDURE TX-tSI-214 Rev. 2 FC NfA EXAMINER Mort ni, George , LEVEL I1 DATE 4t198 EXAMINER - N/A LEVEL NIA DATE COMPONENT ID TBX-2-1110.1 RELATED TO Q MT Q PT UT 0 VT PROVIDE SUFFICIENT INFORMATION TO DESCRIBE SIZE, LOCATION AND TYPE OF LIMITATION.

COMMENTS/SKETCHIDETAILS Four nozzles located as shown below. Two 3- nozzles and two 4' nozzles on side 2. 50% not examined.

4

+/-

T S%' 0.15 TU ELECTRIC REVIEW I DATE TU ELECTRIC LEVEL IIIREVEW / DATE ANII REVIEW I DATE DeBonis, John R a /alt, Joe-C. li, if.j

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