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{{#Wiki_filter:UNITED NUCLEAR REGULATORY WASHINGTON, D.C. 20555-0001 | {{#Wiki_filter:UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 | ||
James A. FitzPatrick Nuclear Power Plant P.O. Box 110 Lycoming, NY 13093 JAMES A. FITZPATRICK NUCLEAR POWER PLANT - | ~lq, am Vice President, Operations Entergy Nuclear Operations, Inc. | ||
REQUEST FOR ADDITIONAL INFORMATION RE: THIRD 10-YEAR INSERVICE INSPECTION INTERVAL PROGRAM PLAN RELIEF REQUEST RR-CRV-01 (TAC NO. MD8717) | James A. FitzPatrick Nuclear Power Plant P.O. Box 110 Lycoming, NY 13093 | ||
==SUBJECT:== | |||
JAMES A. FITZPATRICK NUCLEAR POWER PLANT - REQUEST FOR ADDITIONAL INFORMATION RE: THIRD 10-YEAR INSERVICE INSPECTION INTERVAL PROGRAM PLAN RELIEF REQUEST RR-CRV-01 (TAC NO. MD8717) | |||
==Dear Sir or Madam:== | ==Dear Sir or Madam:== | ||
The U.S. Nuclear Regulatory Commission (NRC) staff, with technical assistance from Pacific Northwest National Laboratory (PNNL), (contractor), has reviewed and evaluated the information provided by Entergy Nuclear Operations, Inc. (the licensee), in its letter dated April 30, 2008, which proposed its Third 10-Year Intervallnservice Inspection Program Plan Request for Relief RR-CRV-01 for James A. FitzPatrick Nuclear Power Plant. Based on this review, it was determined that additional information is required to complete the staff's evaluation for Request for Relief RR-CRV-01. The NRC staffs request for additional information (RAI) is contained in the enclosed contractor's Technical Letter Report. On November 19, 2008, the Entergy staff indicated that a response to the RAI would be provided within 60 days of the date of this letter. | |||
Sincerely, fr K. Vaidya, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-333 | The U.S. Nuclear Regulatory Commission (NRC) staff, with technical assistance from Pacific Northwest National Laboratory (PNNL), (contractor), has reviewed and evaluated the information provided by Entergy Nuclear Operations, Inc. (the licensee), in its letter dated April 30, 2008, which proposed its Third 10-Year Intervallnservice Inspection Program Plan Request for Relief RR-CRV-01 for James A. FitzPatrick Nuclear Power Plant. Based on this review, it was determined that additional information is required to complete the staff's evaluation for Request for Relief RR-CRV-01. | ||
The NRC staffs request for additional information (RAI) is contained in the enclosed contractor's Technical Letter Report. On November 19, 2008, the Entergy staff indicated that a response to the RAI would be provided within 60 days of the date of this letter. | |||
Sincerely, (l~v~ fr | |||
~~~:~andra K. Vaidya, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-333 | |||
==Enclosure:== | ==Enclosure:== | ||
As stated cc w/encl: Distribution via Listserv TECHNICAL LETTER REQUEST FOR ADDITIONAL ON THIRD 10-YEAR INSERVICE INSPECTION REQUEST FOR RELIEF FOR ENTERGY NUCLEAR OPERATIONS, JAMES A. FITZPATRICK NUCLEAR POWER DOCKET NUMBER. SCOPE By letter dated April 30, 2008, the licensee, Entergy Nuclear Operations, Inc., submitted Request for Relief RR-CRV-1 from the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code(ASME Code), Section XI, for James A. FitzPatrick Nuclear Power Plant (JAF). The request for relief is for the third 1O-year inservice inspection (lSI) interval in which the licensee adopted the 1989 Edition of ASME Code, Section XI, No Addenda as the Code of Record. | |||
In accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.55a(g)(5)(iii), the licensee has submitted Relief Request RR-CRV-1 for limited examinations in multiple ASME Code Examination Categories. The ASME Code requires that 100% of the examination volumes or surface areas described in Tables IWB-2500 and IWC-2500 be performed during each interval. The licensee stated that 100% of the ASME Code-required volumes or surface areas are impractical to obtain at JAF. 10 CFR 50.55a(g)(5)(iii) states that when licensees determine that conformance with ASME Code requirements is impractical at their facility, they shall submit information to support this determination. The NRC will evaluate such requests based on impracticality, and may impose alternatives, giVing due consideration to public safety and the burden imposed on the licensee. | As stated cc w/encl: Distribution via Listserv | ||
Pacific Northwest National Laboratory (PNNL) has reviewed the information submitted by the licensee, and based on this review, determined the following information is required to complete the evaluation. REQUEST FOR ADDITIONAL INFORMATION Request for Relief RR-CRV-1 (Part A), ASME Code, Section XI. | |||
Examination Category B-A. Items B 1.21 and B1.22, Reactor Pressure Vessel (RPV) Bottom Head Welds The licensee has requested relief from examining 100% of the ASME Code-required volumes for Welds VC-BH-2-3 | TECHNICAL LETTER REPORT REQUEST FOR ADDITIONAL INFORMATION ON THIRD 10-YEAR INSERVICE INSPECTION INTERVAL REQUEST FOR RELIEF RR-CRV-1 FOR ENTERGY NUCLEAR OPERATIONS, INC. | ||
& W-BH-2A thru 2F. The licensee has indicated that no coverage or examination of these welds is possible for the following reasons. Access to the area is limited to four 18" diameter manways 90 0 apart in the vessel support skirt. In addition, the one hundred and thirty-seven (137) control rod drives and forty-three (43) in-core monitor instrumentation penetrations present extensive interference. | JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NUMBER. 50-333 | ||
: 1. SCOPE By letter dated April 30, 2008, the licensee, Entergy Nuclear Operations, Inc., submitted Request for Relief RR-CRV-1 from the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code(ASME Code), Section XI, for James A. FitzPatrick Nuclear Power Plant (JAF). The request for relief is for the third 1O-year inservice inspection (lSI) interval in which the licensee adopted the 1989 Edition of ASME Code, Section XI, No Addenda as the Code of Record. | |||
In accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.55a(g)(5)(iii), the licensee has submitted Relief Request RR-CRV-1 for limited examinations in multiple ASME Code Examination Categories. The ASME Code requires that 100% of the examination volumes or surface areas described in Tables IWB-2500 and IWC-2500 be performed during each interval. The licensee stated that 100% of the ASME Code-required volumes or surface areas are impractical to obtain at JAF. | |||
10 CFR 50.55a(g)(5)(iii) states that when licensees determine that conformance with ASME Code requirements is impractical at their facility, they shall submit information to support this determination. The NRC will evaluate such requests based on impracticality, and may impose alternatives, giVing due consideration to public safety and the burden imposed on the licensee. | |||
Pacific Northwest National Laboratory (PNNL) has reviewed the information submitted by the licensee, and based on this review, determined the following information is required to complete the evaluation. | |||
: 2. REQUEST FOR ADDITIONAL INFORMATION 2.1 Request for Relief RR-CRV-1 (Part A), ASME Code, Section XI. Examination Category B-A. Items B 1.21 and B1.22, Reactor Pressure Vessel (RPV) Bottom Head Welds The licensee has requested relief from examining 100% of the ASME Code-required volumes for Welds VC-BH-2-3 & W-BH-2A thru 2F. The licensee has indicated that no coverage or examination of these welds is possible for the following reasons. | |||
Access to the area is limited to four 18" diameter manways 90 0 apart in the vessel support skirt. In addition, the one hundred and thirty-seven (137) control rod drives and forty-three (43) in-core monitor instrumentation penetrations present extensive interference. | |||
The positioning and spacing of these components prevent an inspector from physically being able to reach them and limits the surface distance required to perform the examination (reference attached photograph depicting configuration). | The positioning and spacing of these components prevent an inspector from physically being able to reach them and limits the surface distance required to perform the examination (reference attached photograph depicting configuration). | ||
Enclosure | Enclosure | ||
-2 This combined with the curvature of the bottom head and the Bioshield wall narrowing in this area precludes access. Permanent vessel insulation and limited storage space for those insulation panels which require removal is extremely limited based on the size of the manways. The ASME Code requires that essentially 100% of the accessible length of the subject welds be examined. However, the licensee has stated that there has been no volumetric examination of the accessible portions of the subject welds. In the relief request, the licensee does not adequately demonstrate impracticality of examination for these welds. The relief request contains copies of photographs of the area below the RPV; however, the copies contained in the electronic file are of poor quality and cannot be used to determine accessibility to the subject welds. Please provide a detailed description to clarify the interferences caused by the control rod drive housings and in-core instrument nozzles. Also include readable photographs or sketches in order to clarify the basis to demonstrate the reason why it is impractical to access the subject welds from the outside surface of the RPV. In addition, please confirm that circumferential weld VC-BH-1-2 was volumetrically examined and that the examinations met ASME Code requirements. | |||
The staff has noted that other licensees with similar vintage plants have been able to inspect the accessible portion of the subject welds either from the outside surface of the RPV, or through the use of remote inspection devices applied from the inside surface of the RPV. Discuss whether new technologies have been considered, e.g., robotic tools, applied from the inside of the RPV, which would allow examinations of the subject welds to occur. Request for Relief RR-CRV-1 (Part B). ASME Code. Section XI, Examination Category B-D. Item B3.90. Full Penetration Welded Nozzles in Vessels The licensee has included multiple RPV nozzle-to-shell and nozzle-to-head welds in the subject relief request. Several axial and circumferential coverage calculations and related sketches depicting angle beam orientations for coverage areas are included in the licensee's submittal. However, in many of the licensee's sketches, it is unclear which portion and how much of the ASME Code-required volumes have been completed. Please re-submit cross-sectional drawings showing volume coverage for each of the ultrasonic angles applied. Include written descriptions of the ASME Code-required volumes and areas of completed coverage for each of the techniques (near surface, inner 15%, and full volume) used on these welds. | -2 This combined with the curvature of the bottom head and the Bioshield wall narrowing in this area precludes access. Permanent vessel insulation and limited storage space for those insulation panels which require removal is extremely limited based on the size of the manways. | ||
Summarize scanning directions and techniques, list the materials for the base materials and welds, and state whether any reportable indications were detected during the examinations. The licensee has provided some limited drawings depicting interferences from insulation brackets and rings. and proximity of mirror insulation that cause scanning difficulties. However, no discussion of why this insulation cannot be removed is given. Please discuss whether the limited examinations caused by interference from insulation cannot be remedied by removal of the subject insulation and supporting appurtenances. | The ASME Code requires that essentially 100% of the accessible length of the subject welds be examined. However, the licensee has stated that there has been no volumetric examination of the accessible portions of the subject welds. In the relief request, the licensee does not adequately demonstrate impracticality of examination for these welds. The relief request contains copies of photographs of the area below the RPV; however, the copies contained in the electronic file are of poor quality and cannot be used to determine accessibility to the subject welds. Please provide a detailed description to clarify the interferences caused by the control rod drive housings and in-core instrument nozzles. Also include readable photographs or sketches in order to clarify the basis to demonstrate the reason why it is impractical to access the subject welds from the outside surface of the RPV. In addition, please confirm that circumferential weld VC-BH-1-2 was volumetrically examined and that the examinations met ASME Code requirements. | ||
Clarify whether the methods used to examine each of the RPV nozzle-to-shell or head welds have been qualified in accordance with performance demonstration requirements per ASME Code, Section XI, Appendix VIII. | The staff has noted that other licensees with similar vintage plants have been able to inspect the accessible portion of the subject welds either from the outside surface of the RPV, or through the use of remote inspection devices applied from the inside surface of the RPV. | ||
-Request for Relief RR-CRV-1 (Part C), ASME Code, Section XI, Examination Category B-8-1, Item B6.40, Reactor Vessel Flange Ligament The licensee has included, as Enclosure 10 | Discuss whether new technologies have been considered, e.g., robotic tools, applied from the inside of the RPV, which would allow examinations of the subject welds to occur. | ||
Submit further description of the limiting conditions for performing the magnetic particle examinations on the integral attachment welds. In addition, state whether surface examination coverage could be increased by using liqUid penetrant examination techniques. Also, state whether the surface and VT-1 examinations detected any reportable conditions. Request for Relief RR-CRV-1 (Part E) ASME Code, Section XI, Examination Category C-A. Item C1.20, Pressure Retaining Welds in Pressure Vessels The licensee provided, as Enclosure | 2.2 Request for Relief RR-CRV-1 (Part B). ASME Code. Section XI, Examination Category B-D. Item B3.90. Full Penetration Welded Nozzles in Vessels The licensee has included multiple RPV nozzle-to-shell and nozzle-to-head welds in the subject relief request. Several axial and circumferential coverage calculations and related sketches depicting angle beam orientations for coverage areas are included in the licensee's submittal. | ||
Submit further description of the limiting conditions for performing ultrasonic examination, and re-submit the cross-sectional sketch showing areas of completed coverage for each of the ultrasonic techniques employed. Request for Relief RR-CRV-1 (Part F) ASME Code, Section XI, Examination Category C-B, Item C2.22, Pressure Retaining Nozzle Welds in Vessels The licensee provided, as Enclosure | However, in many of the licensee's sketches, it is unclear which portion and how much of the ASME Code-required volumes have been completed. Please re-submit cross-sectional drawings showing volume coverage for each of the ultrasonic angles applied. Include written descriptions of the ASME Code-required volumes and areas of completed coverage for each of the techniques (near surface, inner 15%, and full volume) used on these welds. Summarize scanning directions and techniques, list the materials for the base materials and welds, and state whether any reportable indications were detected during the examinations. | ||
Submit further description of the limiting conditions for performing ultrasonic examination, and re-submit the cross-sectional sketch showing areas of completed coverage for each of the ultrasonic techniques employed. | The licensee has provided some limited drawings depicting interferences from insulation brackets and rings. and proximity of mirror insulation that cause scanning difficulties. However, no discussion of why this insulation cannot be removed is given. Please discuss whether the limited examinations caused by interference from insulation cannot be remedied by removal of the subject insulation and supporting appurtenances. | ||
Request for Relief RR-CRV-1 (Part G) ASME Code. Section XI, Examination Category R-A, Item R1.20 (Category C-F-2. Item C 5.51) Pressure Retaining Welds in Carbon or Low Alloy Steel Piping The licensee has provided a drawing, Enclosure | Clarify whether the methods used to examine each of the RPV nozzle-to-shell or head welds have been qualified in accordance with performance demonstration requirements per ASME Code, Section XI, Appendix VIII. | ||
Please submit further written description to demonstrate impracticality. In addition, describe the ultrasonic techniques employed. In addition to the bases for impracticality, state whether any outside diameter surface feature, such as weld crown, diametrical weld shrinkage, or surface roughness conditions caused limited volumetric coverage during the subject piping weld examinations. Discuss the efforts that were used to correct these conditions. | |||
Clarify whether the methods used to examine the subject piping weld have been qualified in accordance with performance demonstration requirements per ASME Code, Section XI, Appendix VIII. | - 3 2.3 Request for Relief RR-CRV-1 (Part C), ASME Code, Section XI, Examination Category B-8-1, Item B6.40, Reactor Vessel Flange Ligament 1 | ||
The licensee has included, as Enclosure 10 , a rough hand sketch depicting areas of limited scanning. However, insufficient text is provided in order to make use of the drawing. In order to demonstrate impracticality, submit a detailed written description of how the machined areas on either side of the threaded areas in the RPV flange impacted ultrasonic scanning. In addition, describe the ultrasonic methods employed to maximize coverage for the subject areas. | |||
2.4 Request for Relief RR-CRV-1 (Part D), ASME Code, Section XI, Examination Category B-K. Item B10.10, Integrally Welded Attachments The licensee provided, as Enclosure 11 1 , two drawings showing the RPV stabilizer brackets and listing surface and visual coverage. However, insufficient text has been provided to discuss the exact cause of the limited surface examination. Submit further description of the limiting conditions for performing the magnetic particle examinations on the integral attachment welds. | |||
In addition, state whether surface examination coverage could be increased by using liqUid penetrant examination techniques. Also, state whether the surface and VT-1 examinations detected any reportable conditions. | |||
2.5 Request for Relief RR-CRV-1 (Part E) ASME Code, Section XI, Examination Category C-A. Item C1.20, Pressure Retaining Welds in Pressure Vessels The licensee provided, as Enclosure 121 , two drawings showing ultrasonic angle beams applied and scanning obstructions due to supports and weld-o-Iets. However, insufficient text is given to adequately describe the level of ASME Code coverage was obtained. Submit further description of the limiting conditions for performing ultrasonic examination, and re-submit the cross-sectional sketch showing areas of completed coverage for each of the ultrasonic techniques employed. | |||
2.6 Request for Relief RR-CRV-1 (Part F) ASME Code, Section XI, Examination Category C-B, Item C2.22, Pressure Retaining Nozzle Welds in Vessels The licensee provided, as Enclosure 131, two drawings showing ultrasonic angle beams applied and geometrical conditions that may affect ultrasonic scanning. However, insufficient text is given to adequately describe the level of ASME Code coverage that was obtained. Submit further description of the limiting conditions for performing ultrasonic examination, and re-submit the cross-sectional sketch showing areas of completed coverage for each of the ultrasonic techniques employed. | |||
-4 2.7 Request for Relief RR-CRV-1 (Part G) ASME Code. Section XI, Examination Category R-A, Item R1.20 (Category C-F-2. Item C 5.51) Pressure Retaining Welds in Carbon or Low Alloy Steel Piping The licensee has provided a drawing, Enclosure 141 , which is believed to show the coverage obtained from the pipe side of the weld for axial scans. However, insufficient text is included to describe the conditions that limit ultrasonic scanning in both the axial and circumferential directions. | |||
Please submit further written description to demonstrate impracticality. In addition, describe the ultrasonic techniques employed. | |||
In addition to the bases for impracticality, state whether any outside diameter surface feature, such as weld crown, diametrical weld shrinkage, or surface roughness conditions caused limited volumetric coverage during the subject piping weld examinations. Discuss the efforts that were used to correct these conditions. | |||
Clarify whether the methods used to examine the subject piping weld have been qualified in accordance with performance demonstration requirements per ASME Code, Section XI, Appendix VIII. | |||
ML083100663 (*) -No change from the RAI Memo. | ML083100663 (*) - No change from the RAI Memo. | ||
OFFICE | OFFICE LPL 1-1\PM,. M"~ LPL 1-1\LA CPNB/BC(*) CVIB/BC(*) LPL1-1\BC NAME B. K. Vaidtc(~( SLittle TChan MMitchel1 MKo)Nal In"f<..V DATE ll!lq/Ob' 11/18/08 10/13/08 10/13/08 filler tJ~}} | ||
CVIB/BC(*) LPL1-1\BC NAME B. K. SLittle TChan MMitchel1 MKo)Nal | |||
Latest revision as of 11:29, 14 November 2019
| ML083100663 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 11/19/2008 |
| From: | Bhalchandra Vaidya Plant Licensing Branch 1 |
| To: | Entergy Nuclear Operations |
| vaidya B, NRR/Dorl/lpl1-1, 415-3308 | |
| References | |
| TAC MD8717 | |
| Download: ML083100663 (6) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001
~lq, am Vice President, Operations Entergy Nuclear Operations, Inc.
James A. FitzPatrick Nuclear Power Plant P.O. Box 110 Lycoming, NY 13093
SUBJECT:
JAMES A. FITZPATRICK NUCLEAR POWER PLANT - REQUEST FOR ADDITIONAL INFORMATION RE: THIRD 10-YEAR INSERVICE INSPECTION INTERVAL PROGRAM PLAN RELIEF REQUEST RR-CRV-01 (TAC NO. MD8717)
Dear Sir or Madam:
The U.S. Nuclear Regulatory Commission (NRC) staff, with technical assistance from Pacific Northwest National Laboratory (PNNL), (contractor), has reviewed and evaluated the information provided by Entergy Nuclear Operations, Inc. (the licensee), in its letter dated April 30, 2008, which proposed its Third 10-Year Intervallnservice Inspection Program Plan Request for Relief RR-CRV-01 for James A. FitzPatrick Nuclear Power Plant. Based on this review, it was determined that additional information is required to complete the staff's evaluation for Request for Relief RR-CRV-01.
The NRC staffs request for additional information (RAI) is contained in the enclosed contractor's Technical Letter Report. On November 19, 2008, the Entergy staff indicated that a response to the RAI would be provided within 60 days of the date of this letter.
Sincerely, (l~v~ fr
~~~:~andra K. Vaidya, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-333
Enclosure:
As stated cc w/encl: Distribution via Listserv
TECHNICAL LETTER REPORT REQUEST FOR ADDITIONAL INFORMATION ON THIRD 10-YEAR INSERVICE INSPECTION INTERVAL REQUEST FOR RELIEF RR-CRV-1 FOR ENTERGY NUCLEAR OPERATIONS, INC.
JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NUMBER. 50-333
- 1. SCOPE By letter dated April 30, 2008, the licensee, Entergy Nuclear Operations, Inc., submitted Request for Relief RR-CRV-1 from the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code(ASME Code),Section XI, for James A. FitzPatrick Nuclear Power Plant (JAF). The request for relief is for the third 1O-year inservice inspection (lSI) interval in which the licensee adopted the 1989 Edition of ASME Code,Section XI, No Addenda as the Code of Record.
In accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.55a(g)(5)(iii), the licensee has submitted Relief Request RR-CRV-1 for limited examinations in multiple ASME Code Examination Categories. The ASME Code requires that 100% of the examination volumes or surface areas described in Tables IWB-2500 and IWC-2500 be performed during each interval. The licensee stated that 100% of the ASME Code-required volumes or surface areas are impractical to obtain at JAF.
10 CFR 50.55a(g)(5)(iii) states that when licensees determine that conformance with ASME Code requirements is impractical at their facility, they shall submit information to support this determination. The NRC will evaluate such requests based on impracticality, and may impose alternatives, giVing due consideration to public safety and the burden imposed on the licensee.
Pacific Northwest National Laboratory (PNNL) has reviewed the information submitted by the licensee, and based on this review, determined the following information is required to complete the evaluation.
- 2. REQUEST FOR ADDITIONAL INFORMATION 2.1 Request for Relief RR-CRV-1 (Part A), ASME Code,Section XI. Examination Category B-A. Items B 1.21 and B1.22, Reactor Pressure Vessel (RPV) Bottom Head Welds The licensee has requested relief from examining 100% of the ASME Code-required volumes for Welds VC-BH-2-3 & W-BH-2A thru 2F. The licensee has indicated that no coverage or examination of these welds is possible for the following reasons.
Access to the area is limited to four 18" diameter manways 90 0 apart in the vessel support skirt. In addition, the one hundred and thirty-seven (137) control rod drives and forty-three (43) in-core monitor instrumentation penetrations present extensive interference.
The positioning and spacing of these components prevent an inspector from physically being able to reach them and limits the surface distance required to perform the examination (reference attached photograph depicting configuration).
Enclosure
-2 This combined with the curvature of the bottom head and the Bioshield wall narrowing in this area precludes access. Permanent vessel insulation and limited storage space for those insulation panels which require removal is extremely limited based on the size of the manways.
The ASME Code requires that essentially 100% of the accessible length of the subject welds be examined. However, the licensee has stated that there has been no volumetric examination of the accessible portions of the subject welds. In the relief request, the licensee does not adequately demonstrate impracticality of examination for these welds. The relief request contains copies of photographs of the area below the RPV; however, the copies contained in the electronic file are of poor quality and cannot be used to determine accessibility to the subject welds. Please provide a detailed description to clarify the interferences caused by the control rod drive housings and in-core instrument nozzles. Also include readable photographs or sketches in order to clarify the basis to demonstrate the reason why it is impractical to access the subject welds from the outside surface of the RPV. In addition, please confirm that circumferential weld VC-BH-1-2 was volumetrically examined and that the examinations met ASME Code requirements.
The staff has noted that other licensees with similar vintage plants have been able to inspect the accessible portion of the subject welds either from the outside surface of the RPV, or through the use of remote inspection devices applied from the inside surface of the RPV.
Discuss whether new technologies have been considered, e.g., robotic tools, applied from the inside of the RPV, which would allow examinations of the subject welds to occur.
2.2 Request for Relief RR-CRV-1 (Part B). ASME Code.Section XI, Examination Category B-D. Item B3.90. Full Penetration Welded Nozzles in Vessels The licensee has included multiple RPV nozzle-to-shell and nozzle-to-head welds in the subject relief request. Several axial and circumferential coverage calculations and related sketches depicting angle beam orientations for coverage areas are included in the licensee's submittal.
However, in many of the licensee's sketches, it is unclear which portion and how much of the ASME Code-required volumes have been completed. Please re-submit cross-sectional drawings showing volume coverage for each of the ultrasonic angles applied. Include written descriptions of the ASME Code-required volumes and areas of completed coverage for each of the techniques (near surface, inner 15%, and full volume) used on these welds. Summarize scanning directions and techniques, list the materials for the base materials and welds, and state whether any reportable indications were detected during the examinations.
The licensee has provided some limited drawings depicting interferences from insulation brackets and rings. and proximity of mirror insulation that cause scanning difficulties. However, no discussion of why this insulation cannot be removed is given. Please discuss whether the limited examinations caused by interference from insulation cannot be remedied by removal of the subject insulation and supporting appurtenances.
Clarify whether the methods used to examine each of the RPV nozzle-to-shell or head welds have been qualified in accordance with performance demonstration requirements per ASME Code,Section XI, Appendix VIII.
- 3 2.3 Request for Relief RR-CRV-1 (Part C), ASME Code,Section XI, Examination Category B-8-1, Item B6.40, Reactor Vessel Flange Ligament 1
The licensee has included, as Enclosure 10 , a rough hand sketch depicting areas of limited scanning. However, insufficient text is provided in order to make use of the drawing. In order to demonstrate impracticality, submit a detailed written description of how the machined areas on either side of the threaded areas in the RPV flange impacted ultrasonic scanning. In addition, describe the ultrasonic methods employed to maximize coverage for the subject areas.
2.4 Request for Relief RR-CRV-1 (Part D), ASME Code,Section XI, Examination Category B-K. Item B10.10, Integrally Welded Attachments The licensee provided, as Enclosure 11 1 , two drawings showing the RPV stabilizer brackets and listing surface and visual coverage. However, insufficient text has been provided to discuss the exact cause of the limited surface examination. Submit further description of the limiting conditions for performing the magnetic particle examinations on the integral attachment welds.
In addition, state whether surface examination coverage could be increased by using liqUid penetrant examination techniques. Also, state whether the surface and VT-1 examinations detected any reportable conditions.
2.5 Request for Relief RR-CRV-1 (Part E) ASME Code,Section XI, Examination Category C-A. Item C1.20, Pressure Retaining Welds in Pressure Vessels The licensee provided, as Enclosure 121 , two drawings showing ultrasonic angle beams applied and scanning obstructions due to supports and weld-o-Iets. However, insufficient text is given to adequately describe the level of ASME Code coverage was obtained. Submit further description of the limiting conditions for performing ultrasonic examination, and re-submit the cross-sectional sketch showing areas of completed coverage for each of the ultrasonic techniques employed.
2.6 Request for Relief RR-CRV-1 (Part F) ASME Code,Section XI, Examination Category C-B, Item C2.22, Pressure Retaining Nozzle Welds in Vessels The licensee provided, as Enclosure 131, two drawings showing ultrasonic angle beams applied and geometrical conditions that may affect ultrasonic scanning. However, insufficient text is given to adequately describe the level of ASME Code coverage that was obtained. Submit further description of the limiting conditions for performing ultrasonic examination, and re-submit the cross-sectional sketch showing areas of completed coverage for each of the ultrasonic techniques employed.
-4 2.7 Request for Relief RR-CRV-1 (Part G) ASME Code.Section XI, Examination Category R-A, Item R1.20 (Category C-F-2. Item C 5.51) Pressure Retaining Welds in Carbon or Low Alloy Steel Piping The licensee has provided a drawing, Enclosure 141 , which is believed to show the coverage obtained from the pipe side of the weld for axial scans. However, insufficient text is included to describe the conditions that limit ultrasonic scanning in both the axial and circumferential directions.
Please submit further written description to demonstrate impracticality. In addition, describe the ultrasonic techniques employed.
In addition to the bases for impracticality, state whether any outside diameter surface feature, such as weld crown, diametrical weld shrinkage, or surface roughness conditions caused limited volumetric coverage during the subject piping weld examinations. Discuss the efforts that were used to correct these conditions.
Clarify whether the methods used to examine the subject piping weld have been qualified in accordance with performance demonstration requirements per ASME Code,Section XI, Appendix VIII.
ML083100663 (*) - No change from the RAI Memo.
OFFICE LPL 1-1\PM,. M"~ LPL 1-1\LA CPNB/BC(*) CVIB/BC(*) LPL1-1\BC NAME B. K. Vaidtc(~( SLittle TChan MMitchel1 MKo)Nal In"f<..V DATE ll!lq/Ob' 11/18/08 10/13/08 10/13/08 filler tJ~