ML20082M649
| ML20082M649 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 04/19/1995 |
| From: | Richard Anderson NORTHERN STATES POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9504240317 | |
| Download: ML20082M649 (8) | |
Text
1 Northern States Power Cornpany Prairie Island Nuclear Generating Plant 1717 Wakonado Dr. East Welch, Minnesota 55089 April 19, 1995 10 CFR Part 50 Section 50.55a U S Nuclear Regulatory Commission Attn:
Document Control Desk Washington, DC 20555 PRAIRIE ISIAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Reauests for Relief for the 3rd 10-year Interval Inservice Inspection Procrams On August 5, 1994 we submitted for review our third 10-year Inservice Inspection Examination Plan for Unit 1 and on November 15, 1994 we submitted for review our third 10-year Inservice Inspection Examination Plan for Unit 2.
The purpose of this letter is to make changes to associated relief requests.
Attached are Unit 1 Relief Request No. 6 and Unit 2 Relief Request No. 7 which address docwnentation requirements for calibration blocks. The new code requirements for calibration block material documentation were discovered when we were preparing to purchase material for some new calibration blocks. The documentation that we have for our existing calibration blocks does not meet all of the revised requirements. We thus are requesting relief for our existing calibration blocks.
Following receipt of a request for additional information on our previously submitted Unit 1 3rd 10-year interval program, our review determined that certain relief requests were no longer needed. Our response to that request for additional information withdrew those relief requests for the Unit 1 program. With this letter, we also withdraw Relief Requests Nos. 1, 2, and 4 for the Unit 2 3rd 10-year Inservice Inspection Examination Plan.
In this letter we have made no new Nuclear Regulatory Commission commitments.
Please contact Jack Leveille (612-388-1121, Ext. 4662) if you have any questions related to this letter.
f)fe bib W
Roger 0 Anderson Director Licensing and Management Issues
"* E#b 9504240317 950419
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a Attactament 1 March 28, 1995 Page 2 of 4 c: Regional Administrator - Region III, NRC Senior Resident Inspector, NRC NRR Project Manager, NRC J E Silberg B W Brown, INEL Attachments:
- 1) Unit 1: ISI Relief Request No. 6 (Rev. 0), Use of Existing Calibration Blocks
- 2) Unit 2: ISI Relief Request No. 7 (Rev. 0), Use of Existing Calibration Blocks RRf6&f7, DOC
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NORTHERN STATES POWER INSERVICE INSPECTION PRAIRIE ISLAND' EXAMINATION PLAN UNIT 1 3RD INTERVAL 1
ISI Relief Request No. 6 (Rev. 0)(Page 1 of 3)
Use of Existing Calibration Blocks SYSTEM: Variouc Class: 1 and 2 Category: B-3 Item: B 2.11, B 2.12. B 2.40, B 2.51 B-F B 5.10, B 5.40, B 5.70, B 5.130 B-J B 9.11, B 9.12, B 9.31 C-A C 1.10, C 1.20
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C-B C 2.32 C-F-1 C 5.11, C 5.12, C 5.21, C 5.22 C F-2 C 5.51, C 5.52 Examination Reauirements:
4 lWA-2232 states that ultrasonic examination sha!! be conducted in accordance with Appendix 1.
Appendix 1,1-2100 states that ultrasonic examination of vessel welds greater than 2 inches thick shall be conducted in accordance with Acticle 4 4
of Section V as supplemented by Appendix 1.
Section V, Article 4, T-441.1.2 outlines the material specification requirements for calibration blocks. T-441.1.2.1 requires calibration blocks fo be fabricated from one of the following: (a) nozzle drop out from the component; (b) a component prolongs"on; (c) material from the same material specification, product form, and heat treatment as one of the materials being joined.
Appendix 1,1-2200 states that ultrasonic examination of vessel welds less than or equal to 2 inches thick and all piping welds shall be conducted in accordance with Appendix 111, as supplemented by Appendix 1.
Appendix lit, 111-3411 outlines the material spec fication requirements for calibration blocks. Appendix lil,111-3411 requires (a) the calibration blocks for similiar metal welds shall be fabricated from one of the same materials specified for the piping being joined by the weld; (b) calibration blocks for
NORTHERN STATES POWER INSERVICE INSPECTION PRAIRIE ISl_AND EXAMINATION PLAN
- UNIT 1 3RD INTERVAL 1
i ISI Relief Request No. 6 (Rev. 0)(Page 2 of 3)
Use of Existing Calibration Blocks dissimiliar metal welds to be fabricated from the material specified for the side of the weld from which the examination will be conducted. If the examination will be conducted from both sides, calibration reflectors shall be provided in both materials; (c) Where the examination is to be performed from only one side of the joint, the calibration block material shall be of the same specification as the material on that side of the joint; (d) If material of the same specification is not available, material of similar chemical analysis, tensile properties, and metallurgical structure may be used.
Examination Reauirement Not Met Several of the calibration blocks currently being used lack the documentation necessary to demonstrate compliance with the material specification requirements of Article 4 of Section V and Appendix Ill.
Several of the calibration blocks currently being used on pipe to fitting or fitting to fitting joints where examination is performed from both sides of the joint are fabricated to pipe material specifications.
Basis for Relief:
Documentation requirements existing at the time of fabrication did not require traceability to the material's chemical or physical certifications.
Existing calibration blocks certification is verified through appropriate P-number grouping. The P-number grouping provides adequate assurance that the blocks will establish the proper ultrasonic calibration and sensitivity.
t NORTHERN STATES POWER INSERVICE INSPECTION PRAIRIE ISLAND EXAMINATION PLAN UNIT 1 3RD INTERVAL 5
L ISI Relief Request No. 6 (Rev. 0)(Page 3 of 3)
Use of Existing Calibration Blocks Prooosed Alternative Existing calibration blocks will be used as is.
Any calibration blocks obtained in the future will be obtained with documentation to demonstrate compliance the material specification requirements of ASME Code Section V Article 4 or Section XI, Appendix Ill, as applicable.
Justification for Granting Relief it would be impractical to fabricate a new set of calibration blocks in order to satisfy the documentation requirements of the current Code. Existing records, indicate the appropriate P-number grouping, thereby providing adequate assurance that the blocks will establish the proper ultrasonic calibration and sensitivity.
Any new calibration block will be obtained with the documentation necessary to demonstrate compliance with the material specification requirements.
Time Period Relief is Reauested For Relief is requested for the Third Ten Year Interval.
Approval Status:
Not yet approved. Submitted Rev 0 April 17,1995.
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NORTHERN STATES POWER INSERVICE INSPECTION l
PRAIRIE ISLAND EXAMINATION PLAN
' UNIT 2 3RD INTERVAL l
4 i
ISI Relief Request No. 7 (Rev. 0)(Page 1 of 3) f l
Use of Existing Calibration Blocks f
SYSTEM: Various Class: 1 and 2 l
Category: B-B ltem: B 2.11, B 2.12, B 2.40, B 2.51 i
B-F B 5.10, B 5.40, B 5.70, B 5.130 l
B-J B 9.11, B 9.12, B 9.31 C-A C 1.10, C 1.20 C-B C 2.32 I
C-F-1 C 5.11, C 5.12, C 5.21, C 5.22 I
C-F-2 C 5.51, C 5.52 l
Examination Reauirements:
IWA-2232 states that ultrasonic examination shall be conducted in accordance with Appendix 1.
Appendix 1,1-2100 states that ultrasonic examination of vessel welds greater than 2 inches thick shall be conducted in accordance with Acticle 4 of Section V as supplemented by Appendix 1.
Section V, Article 4, T-441.1.2 outlines the material specification requirements for calibration blocks. T-441.1.2.1 requires calibration blocks to be fabricated from one of the following: (a) nozzle drop out from the component; (b) a component prolongation; (c) material from the same material specification, product form, and heat treatment as one of the materials being joined.
Appendix 1,1-2200 states that ultrasonic examination of vessel welds less than or equal to 2 inches thick and all piping welds shall be conducted in accordance with Appendix ill, as supplemented by Appendix 1.
Appendix lil,111-3411 outlines the material specification requirements for calibration blocks. Appendix lil, lll-3411 requires (a) the calibration blocks for similiar metal welds shall be fabricated from one of the same materials specified for the piping being joined by the weld; (b) calibration blocks for
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NORTHERN STATES POWER INSERVICE INSPECTION PRAIRIE ISLAND EXAMINATION PLAN UNIT 2 3RD INTERVAL i
ISI Relief Request No. 7 (Rev. 0)(Page 2 of 3)
Use of Existing Calibration Blocks dissimiliar metal welds to be fabricated from the material specified for the side of the weld from which the examination will be enducted. If the examination will be conducted from both sides, calibetion reflectors shall 4
be provided in both materials; (c) Where the examination is to be performed from only one side of the joint, the calibration block material shall be of the same specification as the material on that side of the joint; (d) If material of the same specification is not available, material of similar chemical analysis, tensile properties, and metallurgical structure may be used.
Examination Reauirement Not Met Several of the calibration blocks currently being used lack the documentation necessary to demonstrate compliance with the material specification requirements of Article 4 of Section V and Appendix 111.
Several of the calibration blocks currently being used on pipe to fitting or fitting to fitting joints where examination is performed from both sides of the joint are fabricated to pipe material specifications.
Basis for Relief; Documentation requirements existing at the time of fabrication did not require traceability to the material's chemical or physical certifications.
Existing calibration blocks certification is verified through appropriate P-number grouping. The P-number grouping provides adequate assurance that the blocks will establish the proper ultrasonic calibration and sensitivity.
i
l NORTHERN STATES POWER INSERVICE INSPECTION PRAIRIE ISLAND EXAMINATION PLAN
- UNIT 2 3RD INTERVAL ISI Relief Request No. 7 (Rev. 0)(Page 3 of 3)
Use of Existing Calibration Blocks Prooosed Alternative Existing calibration blocks will be used as is.
Any calibration blocks obtained in the future will be obtained with documentation to demonstrate compliance the material specification requirements of ASME Code Section V Article 4 or Section XI, Appendix lil, as applicable.
Justification for Grantina Relief it would be impractical to fabricate a new set of calibration blocks in order to satisfy the documentation requirements of the current Code. Existing records, indicate the appropriate P-number grouping, thereby providing adequate assurance that the blocks will establish the proper ultrasonic calibration and sensitivity.
Any new calibration block will be obtained with the documentation necessary to demonstrate compliance with the material specification requirements.
Time Period Reliefis Requested For Relief is requested for the Third Ten Year Interval.
Acoroval Status:
Not yet approved. Submitted Rev 0 April 17,1995.
4 L.