View source for CP-201100772, Response to Request for Additional Information, Relief Requests Nos. B-10 and B-11

{{Adams
| number = ML11173A064
| issue date = 06/15/2011
| title = Response to Request for Additional Information, Relief Requests Nos. B-10 and B-11
| author name = Flores R
| author affiliation = Luminant Generation Co, LLC, Luminant Power
| addressee name = 
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000445
| license number = 
| contact person = 
| case reference number = CP-201100772, TAC ME5217, TAC ME5218, TXX-11071
| document type = Letter type:CP
| page count = 14
| project = TAC:ME5217, TAC:ME5218
| stage = Response to RAI
}}

=Text=
{{#Wiki_filter:Rafael Flores                         Luminant Power Senior Vice President                 P 0 Box 1002
                                                                 & Chief Nuclear Officer               6322 North FM 56 Rafael.Flores@ Luminant.com           Glen Rose, TX 76043 Luminant                                                                                               T 254 897 5550 C 817 559 0403 F 254 897 6652 CP-201100772                                                                                   Ref. # 10CFR50.55a Log # TXX-11071 June 15, 2011 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

==SUBJECT:==
COMANCHE PEAK NUCLEAR POWER PLANT DOCKET NO. 50-445 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION, RELIEF REQUESTS NOS. B-10 AND B-11 (TAC NOS. ME5217 AND ME5218)

==REFERENCES:==
: 1.         Letter logged TXX-10157 dated December 15, 2010 from Rafael Flores to the NRC submitting Relief Request No. B-10 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).
: 2. Letter logged TXX-10158 dated December 15, 2010 from Rafael Flores to the NRC submitting Relief Request No. B-11 for the Unit 1 Second 10 Year ISI Interval from10 CFR 50.55a Inspection Requirements due to Physical Interferences (Second Interval Start Date: August 13, 2000).
: 3. Email dated May 16, 2011 from Balwant Singal of the NRC to Jack Hicks of Luminant Power requesting additional information regarding Relief Request Nos. B-10/B-11.

==Dear Sir or Madam:==

Per references 1 and 2, Luminant Generation Company LLC (Luminant Power) previously submitted requests for relief from the applicable requirements of Section XI of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, as identified in the referenced relief requests.
Luminant Power has determined that certain inspection requirements of ASME Section XI are impractical due to physical interferences. Per reference 3, the NRC provided a request for additional information regarding the subject relief requests.
Luminant Power has provided the information requested per reference 3 in the attachments to this letter.
This communication contains no new commitment regarding Comanche Peak Unit 1.
A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway
* Comanche Peak - Diablo Canyon - Palo Verde
* San Onofre
* South Texas Project - Wolf Creek A&W7
                                                                                                                            ,UJ6

U. S. Nuclear Regulatory Commission TXX-11071 Page 2 of 2 Should you have any questions, please contact Mr. Jack Hicks at (254) 897-6725.
Sincerely, Luminant Generation Company LLC Rafael Flores By:              21" 22 -,-.
                                                                 /Frre   W. Madden Director, Oversight & Regulatory Affairs Attachments             1. Response to Request for Additional Information
: 2. Relief Request B-11 Sketch and Data Sheets c -        E. E. Collins, Region IV                         Ms. Alice Rogers B. K. Singal, NRR                                Environmental & Consumer Safety Section Resident Inspectors, Comanche Peak               Texas Department of State Health Services Brian Welch, ANII, Comanche Peak                 1100 West 49th Street Austin, Texas 78756-3189 to TXX-11071 Page 1 of 3 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION FOR RELIEF REQUEST NUMBERS B-10 and B-11 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) (TAC NOS. ME5217 and ME5218)
The following questions were provided to Luminant Power in the email dated May 16, 2011 from Balwant Singal of the NRC to Jack Hicks of Luminant Power (reference 3) requesting additional information regarding Relief Request Nos. B-10 and B-11:
NRC Question 1:
Please provide material specifications for the weld TBX-1-4201-9 and TBX-1-4201-10 and associated pipe and elbow in RR B-10. Provide the material specifications for weld TBX-1-4300-13 and safe end, in RR B-11.
Luminant Power's Response to Question 1:
TBX-1-4201-9 and TBX-1-4201-10 Pipe welds Line: 10"-SI-1-180-2501R-1 Pipe: 10" diameter, sch. 140; material: SA376, Type 304 stainless steel TBX-1-4300-13 Reactor Vessel safe-end to pipe weld Line: 27.5"-RC-1-042 Pipe: 27.5" diameter, 2.21" thickness; material: SA-351-CF8A Safe-end: material: SA-182, Type F316 stainless steel NRC Question 2:
It appears that the subject welds in RR B-10 are associated with the safety injection system piping.
However, the examination sheets identify the piping system as accumulator discharge. Please identify the exact piping systems for subject welds in RRs B-10 and B-11.
Luminant Power's Response to Question 2:
The piping system is safety injection. The examination data sheets took the component/system description (accumulator discharge) from the description found on the ISI sketch, TBX-1-4201.
NRC Question 3:
For RR B-10, would it be possible to remove the structural restraints to increase the examination coverage? Please clarify.
Luminant Power's Response to Question 3:
The structural restraint, an obstruction when conducting the volumetric examination, is a pipe support for the safety injection line and is attached to the lower structural beam for Steam Generator #2. This restraint cannot be easily removed. Removal would have required a temporary support (s) for the safety injection line. Additional dose would also be obtained during the removal /reinstallation of the restraint and temporary support.

Attachment I to TXX-11071 Page 2 of 3 This piping configuration was the same in all four loop rooms, with this line selected because more weld volume could be obtained by examining these two welds. This fact was determined by field walk downs.
NRC Question 4:
For RR B-10, did Luminant Generation Company LLC consider using longitudinal waves to examine past the centerline in the area currently limited from examination, thus increasing the examination coverage?
Please clarify Luminant Power's Response to Question 4:
Longitudinal wave examinations for the subject welds would not improve/generate additional volumetric coverage. The subject welds were examined from two sides in both the axial and circumferential directions on all accessible sides/directions.
NRC Question 5:
Section 3 of RR B-10 states that "...The subject pipe size is 10" and Table IWB-2500-1 calls for a surface examination of the weld..." Please discuss whether a surface examination has been performed in the inside or outside surface of the subject welds. If no, please justify why a surface examination was not performed.
Luminant Power's Response to Question 5:
Per the second paragraph under Section 3 of Relief Request B-10, CPNPP has adopted RI-ISI for ASME Code Class 1 and 2 piping welds, with the alternative approved by the NRC in a Relief Request for the second interval of Unit 1. Following Code Case N-578 and EPRI methodology in TR-112657 revision B-A, these welds are classified as Category R-A, Item No. R1.16, with IGSCC identified as the degradation mechanism. Using the EPRI document, the degradation mechanism is from the inside diameter (ID) of the pipe/weld and only a volumetric examination is required. Thus, a surface examination is not performed.
NRC Question 6:
Please provide the inspection history (inspection dates, methods used, and Non Destructive Examination results) of the subject welds in RRs B-10 and 11.
Luminant Power's Response to Question 6:
RR B-10 for TBX-1-4201-9 and TBX-1-4201-10 Pipe welds were examined in 1RF13 (Fall 2008). These welds were selected for RI-ISI for the second interval of Unit 1. There were no recordable indications identified. Presevice Inspections PSI) of the subject welds occurred during 1984, with ultrasonic testing, penetrant testing, and visual examinations performed. There were no limitations and no recordable indications identified.
RR B-11 for TBX-1-4300-13 Reactor vessel safe-end to pipe weld was examined in IRF14 (Spring 2010) and 1RF07.

Attachment i to TXX-11071 Page 3 of 3 NRC Question 7:
For RRs B-10 and B-11, please discuss whether new Ultrasonic Testing (UT) technology (e.g., phased-array UT) has been considered which may provide higher percentage of examination coverage than the existing UT technology. If yes, please discuss whether the new UT technology will be used in the next in-service inspection. If no, please discuss why new UT technology was not explored.
Luminant Power's Response to Question 7:
Phased array UT was not considered. The limitation caused by the obstruction is such that no coverage could be obtained in this area with any other ultrasonic technique, from any other direction.
NRC Question 8:
For RR B-11, please provide illustrations of the weld configuration that identifies the examined weld area/volume and the weld area/volume that was not examined. Specifically describe how the configuration or obstruction restricts full examination of the weld. The configuration should include the reactor vessel nozzle, safe end, weld, pipe, and counter-bore.
Luminant Power's Response to Question 8:
A sketch depicting the required weld area/volume to be examined and the data sheets are included as  to this response. There is no readily available sketch annotating the weld are/volume that was not examined for UT. As stated in RR B-11, this limitation of 88.99% was caused by the ID configuration of the counter-bore and root configuration, where the sled with the transducers attached was not in the required contact surface with the weld. Thus, volumetric coverage in this area could not be credited. The combined coverage of UT and Eddy Current Testing (ET) did yield 100% coverage.
NRC Question 9:
RR B-11 proposed a supplemental examination using eddy current techniques on the inside surface of the pipe/weld. Please discuss why this supplemental eddy current examination is not proposed for the welds in RR B-10.
Luminant Power's Response to Question 9:
As stated previously in the answer to question 5 and in RR B-10, welds TBX-1-4201-9 and TBX-1-4201-10 are RI-ISI welds; Category R-A, Item No. 1.16. Since the degradation mechanism occurs from the ID, only a volumetric examination is required per the EPRI methodology and Code Case N-578. The manual UT examination of these welds occurred from the OD and examined the lower 1/3 volume of the weld base metal.

DETECTION SLED SCANS CD0 cu                            INCREMENT DISTANCE = 0,25' (1.04*) f or AXIAL SCANS    3I A   ~       1 f
                                                                     = 0.08' f or CIRC SCANS mg                                                                                E; T2 C.
U               L
: n. L             L x  x                           I DISTANCE FROM __
VESSEL QL SIZING SLED SCANS INCREMENT DISTANCE = 0.125' (0,52") f or AXIAL SCANS
                                                                     = 0,08' for CIRC SCANS DM WELDS        ELBOW WELDS       NOZZLE COMANCHE               PEAK       1-TBX TBX-1-4400-14 TBX-1-4300-14 TBX-1-4400-13 TBX-1-4300-13
                                   @ 67"
                                   @ 113"                   WesDyne Internationca TBX-1-4200-14    TBX-1-4200-13     @ 247*
TBX-1-4100-14    TBX-1-4100-13     2 293*                 sMut     INLET      SAFE    END    EXAMS 2010 EXAMINATION PROGRAM                PLAN ALL DMENSIONSIN UNLESS             NOTED OTHERWISE INC    JSHEET     6 OF  6

Attachment 2 to TXX-1 1071 Page 2 of 9 WesDyne International Reactor Vessel Weld Results Summary COMANCHE PEAK UNIT 1 WELD NO.                        DESCRIPTION COVERAGE TBX-1-4300-14              Inlet Nozzle to Safe-End  @ 1130                100%
TBX-1-4300-13              Inlet Safe-End to Elbow   @ 1130               *88.99%
LIMITATIONS                     NO   LII        YESW1X
                                                                  *flD Configuration of Safe-End to Elbow Weld UT RESULTS                                          NO. OF UT INDICATIONS              0 STATUS                N/A ET RESULTS El              NO. OF ET INDICATIONS             0 STATUS                N/A EXAM DOCUMENTATION                          INDICATION DOCUMENTATION
[-] ANALYSIS LOG                                 D ASSESSMENT SHEET
*j     ACQUISITION LOG                           D-PARAGON HARD COPY F] SCAN PRINTOUT                                 D--OTHER       (specify)
[X COVERAGE BREAKDOWN WESDYNE ANALYST                     I--              e maWpsyml                                                                                                                                                   ->
Page        1    of 1 ANALYSIS LOG #              SE-1 13-1 I Disk No:     I Utility: ILUMINANT                                Plant:       C OMANCHE PEAK                    U      It 1 Outage: I IRF14                                0 Procedure No:       PDI-ISI-254-SE-NB                                                                               Procedure Rev. No.:             1 Weld No:      TBX-1-4300-13, 14                                             Weld Type:     DM/SE/PIPE         Exam. Surface: ID Applicable Sensitivity Calibration Data Sheet No:        PDI-SE-AX-DET-01   Acquisition Log No:      SE-      PARAGON Anal. Release:              6.3.5 PDI-SE-CIRC-DET-01                          I113-1 UT Examiner Signature:                                                                                       Level:    II   Date:        4-17-2010 Data File Name                 UT       Beam Angle I           NI  RI                            RI                         Examiner IDI Channel          Beam                           Resolution I Comments I Limitations                  Date No.      Direction       [pIor out, CW or C W]
TBX-113-PRP-IN                   1             70 IN            X                                                              JDF /4-17-10 TBX-113-PRP-IN                   2           70 OUT             X                                                              JDF /4-17-10 TBX-113-PRP-IN                   5             70 IN            X                                                              JDF / 4-17-10 TBX-1 13-PRP-IN                  6           70 OUT              X                                                              JDF/4-17-10 TBX-113-PAR-IN                   1           70 CCW             X                                                               JDF/4-17-10 TBX-113-PAR-IN                   2            70 CW             X                                                               JDF / 4-17-10 TBX-113-PAR-IN                   3           70 CCW             X                                                               JDF / 4-17-10 TBX-1 13-PAR-IN                  4            70 CW             X                                                              JDF / 4-17-10 TBX-1 13-PAR-IN                  5          70 CCW              X                                                              JDF / 4-17-10 TBX-113-PAR-IN                   6            70 CW             X                                                              JDF/ 4-17-10 TBX-113-PAR-IN                   7          70 CCW              X                                                              JDF / 4-17-10 TBX-113-PAR-IN                   8           70 CW              X Form 12.5 PDI-ISI-254-SE-NB, Rev. 1

                                                                                                                                                         -0 >
CD 02 ID.
ET Analysis Log: SE-113-1
                                                                                                                                                             -4
  .Utility: LUMINANT                                            Plant: COMANCHE PEAK                               Unit: I             Outage: 1R14 Procedure No: WDI-STD-146                                                                                       Procedure Rev. No.: 9 Weld No. TBX-1-4300-13,14                                                                 Weld Type: DMISE/PIPE Applicable Sensitivity Callbra Data S    No:  ET-1                                                              Acquisition Log No: SE-113-1 ET Examiner Signature:                                                    Level: II                                           Date: 4-17-2010 Data                  ET      ET Probe Scan     NI      RI                         RI                              Examiner ID I Date File Name              Probe       Direction                          Resolution I Comments I Limitations No.         (Avial/Ci]
TBX-113-PRP-IN              I          AXIAL         X                                                                     JDF /4-17-10 TBX-113-PRP-IN              2           AXIAL         X                                                                     JDF 14-17-10 TBX-113-PRP-IN              3           AXIAL         X                                                                     JDF 14-17-10 TBX-113-PRP-IN              4           AXIAL         X                                                                     JDF 14-17-10 TBX-113-PAR-IN             I             CIRC         X                                                                    JDF 14-17-10 TBX-113-PAR-IN             2             CIRC         X                                                                    JDF 14-17-10 TBX-113-PAR-IN             3             CIRC         X                                                                    JDF 14-17-10 TBX-113-PAR-IN             4            CIRC         X                                                                     JDF 14-17-10 Form 12-5

malwqspyfl DATA ACQUISITION LOG #                  SE-113-1 Utility: I LUMINANT                                Plant: I Comanche Peak                             Unit:   1      Outage: I1RF14 0
Procedure No: I PDI-ISI-254-SE-NB                                                                                    Procedure Rev. No.: I I Applicable Sensitivity Calibration Data Sheet No: PDI-SE-AX-DET-01, PDI-SE-CIRC-DET-01 UT Examiner Signature:                          -,              j    t                                 Level:        11  Date:    4/17/2010 Data File Name            Weld No.           Index       Scan    Total #   'AVE'     Gain    _.           Date      Time   Comments Start       Start      of    Signal     Adj.
Sweeps  Amplitude   (dB)
* m (d   .CO    (mmfddlyy) o--
TBX-113-PRP-IN 1          TBX-1-4300-13,14      -2.0'     120.72"    178        11        0      KB       4/17/10      0344 TBX-113-PRP-IN 1          TBX-1-4300-13,14      -2.0'     120.72"    178        11        0      KB       4/17/10      0344 TBX-113-PRP-IN 1          TBX-1-4300-13,14      -2.0'     120.72"    178        14        0      KB       4/17/10      0344 TBX-113-PRP-IN I         TBX-i-4300-13,14       -2.0"     120.72"    178         9        0      KB       4/17/10     0344 TBX-113-PAR-IN 1         TBX-1-4300-13,14     128.14"       -2.0. 62       14         0     KB        4/17/10     0410 TBX-113-PAR-IN 1         TBX-1-4300-13,14     128.14"       -2.0'     62        9        0      KB        4/17/10     0410 TBX-113-PAR-IN 1          TBX-1-4300-13,14     128.14"      -2.0"      62        9        0      KB        4/17/10     0410 TBX-113-PAR-IN 1          TBX-1-4300-13,14     128.14"      -2.0&deg;     62        13        0      KB        4/17/10     0410 TBX-113-PAR-IN 1          TBX-1-4300-13,14    128.14"       -2.0&deg;     62        12        0      KB       4/17/10      0410 TBX-113-PAR-IN 1          TBX-1-4300-13,14    128.14"       -2.0&deg;     62        11        0      KB       4/17/10      0410 TBX-113-PAR-IN 1          TBX-1-4300-13,14    128.14"       -2.0"     62        12        0      KB       4/17/10      0410 TBX-113-PAR-IN 1          TBX-1-4300-13,14    128.14"       -2.0&deg;     62        13        0      KB       4117/10      0410 Form 12.4 PDI-ISI-254-SE-NB, Rev. 1 to TXX-1 1071 Page 6 of 9 TBX-113-PRP-INScanSummary4-17-2010_3-44-58.log WesDyne International Reactor Vessel Inservice Examination Scan Parameter Execution SITE ........................                             Comanche Peak #1 CONTROL SYSTEM                 ..............             SQUID Site Weld ID                                    =    Inlet     SE Weld and Scan Type                               =    inlet     SE PERPENDICULAR SCAN Scan Data File Name                             =    TBX-113-PRP-IN SCAN AREA DEFINITIONS                                      SCAN            INDEX (inch)          (degree)
START CW                                                120.720           -2.000 END CW                        .                         135.390          182.080 START CCW                     :                         135.390          182.080 END CCW                       .                         120.720           -2.000 SCAN AREA COVERED                                          SCAN            INDEX (inch)         (degree)
TOP LEFT                        .                       120.720           -2.000 TOP RIGHT                        :                      135.390           -2.000 BOTTOM LEFT                     :                      120.720          182.080 BOTTOM RIGHT                    :                      135.390          182.080 Increment Size (deg)                                                     =  1.040 Number of indexes specified                                              =  178 Number of Indexes Completed                                              =  178 Ti me             Date Scan Started                                           03:24:49                04/17/2010 Scan Completed                                         03:44:58                04/17/2010 OPERATOR                                                           DATE    04/17/2010 03:44:58 OPERATOR                              Al /A4                       DATE    04/17/2010 03:44:58 COMMENTS Page 1 to TXX-1 1071 Page 7 of 9 TBX-113-PAR-INScanSummary4-17-2010_4-10-15.log WesDyne International Reactor vessel Inservice Examination scan Parameter Execution SITE ........................                    Comanche Peak #1 CONTROL SYSTEM ..............                    SQUID Site Weld ID                         =      Inlet SE weld and Scan Type                   =      Inlet SE PARALLEL SCAN Scan Data File Name                 =      TBX-113-PAR-IN SCAN AREA DEFINITIONS                           SCAN             INDEX (degree)             (inch)
START CW                  :                    -2.000        128.140 END CW                     .               182.000           133.020 START CCW                                 182.000           133.020 END CCW                   .                   -2.000        128.140 SCAN AREA COVERED                               SCAN             INDEX (degree)           (inch)
TOP LEFT                  :                   -2.000        128.140 TOP RIGHT                                  182.000          128.140 BOTTOM LEFT                                   -2.000        133.020 BOTTOM RIGHT               :               182.000          133.020 Increment size (in)                                             =  0.080 Number of Indexes Specified                                     =  62 Number of Indexes Completed                                      = 62 Ti me                Date scan started                                 03:53:25                 04/17/2010 Scan Completed                               04:10:15                 04/17/2010 OPERATOR                '                                 DATE    04/17/2010 04:10:15 OPERATOR            __   _  _   _    _    _   _  _       DATE    04/17/2010 04:10:15 COMMENTS Page 1

COMANCHE PEAK UNIT 1                                                    DIRECTION / ORIENTATION C(0~
RPV COVERAGE ESTIMATE BREAKDOWNS                                       PARALLEL SCANS                        CCW / CW PERP. SCANS                             IN / OUT  00=
WELD                                                                     WELD NO.                      TBX-1-4300-13 DESCRIPTION          Inlet Nozzle Safe-End to Elbow @ 1130 BEAM ANGLES BEAM                     700 L Dual            *ET DIRECTION EXAM VOLUME      EXAM SURFACE CCW                        77.97*              100 cw                        77.97*              100 IN                         100              N/A OUT                          100              N/A UT COVERAGE = 88.99%                           Procedure limited in the detection of axial flaws per the PDQS document.
Combined Coverage (UT & ET) = 100o                           of limitation Areas *1D            inspected Configuration        by Eddy Current technique.
of Safe-End to Elbow weld ANALYST          ~2c~

a, COMANCHE PEAK UNIT 1                                             DIRECTION I ORIENTATION         CDO RPV COVERAGE ESTIMATE BREAKDOWNS                                 PARALLEL SCANS        CCW / CW  Co -
PERP. SCANS            IN / OUT
                                                                                                      -4 WELD                                                               WELD NO.        TBX-1-4300-14      0
                                                                                                      -.4 DESCRIPTION             Inlet Nozzle to Safe-End @ 1130 BEAM ANGLES BEAM                      700 L Dual        *ET DIRECTION EXAM VOLUME   EXAM SURFACE Ccw                          100           100 Cw                          100           100 IN                        100           N/A OUT                         100           N/A UT COVERAGE =   100%
Combined Coverage (UT & ET) 100%
ANALYST__________}}