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ASME Section XI Meeting Notes - December 2004

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Introduction

Prepared By: Dajun Song and Jerry Crider

Company: Progress Energy

Meeting Dates: December 13 – 16, 2004

Meeting Location: San Francisco, California

Meeting Notes

General Announcements

1. Next Section XI meeting is in Birmingham, AL.  The meeting dates, 02/28/05 – 03/04/05.  Sheraton Birmingham, (205) 324-5000.  $139/night.

 

2. NRC Report

 

·        Next Draft Reg. Guide (Revision 14) was published for public comment on August 3, 2004.  This will cover up to Supplement 6 of 2001 Code Cases.  The public comment period closed on September 2, 2004.  The staff has developed responses to the comments, and the draft final guide package is currently under review.  Publication is anticipated in the Spring of 2005.

 

·        The final amendment to 10 CFR 50.55a incorporating by reference the 2001 Edition up to and including the 2003 Addenda of the ASME Code, was published on October 1, 2004.  The rule became effective November 1, 2004.

 

3. The process of annulling code cases.  Code cases that have been incorporated into a code edition and addenda that the NRC has endorsed through 10CFR50.55a, AND are in the Regulatory Guide are annulled.  The rest will be reaffirmed.

 

4. ISI/NRC Symposium scheduled for 2005 has been cancelled due to lack of resources from NRC.  However, at the ASME Pressure Vessel Conference in Denver, CO (7/17/05 – 7/21/05), there will be sessions dealing with ISI and Regulator issues.

 

5. Snubber Testing.  There was a Code action to remove snubber testing from ASME XI.  This action failed at WGISC.  However, SCXI was directed, by BNCS, to remove all requirements for the examination and testing of snubbers from ASME XI.  Repair/Replacement activities for snubers are to remain the responsibility of SCXI and remain in ASME XI.

Code Committee Items

1. Task Group on Alternative NDE Methods for Repair/Replacement/Modification (RRM) Activities.  One issue is to resolve using ASME XI acceptance criteria vs. Section III.  A technical paper will be developed to address this issue.

 

2. Task Group on Boric Acid.  Proposed Code Case N-722 passed SCXI.  This Code Case provides examination requirements for Alloy 600/182/82 components.  Received four MC negatives.  The TG and MRP came up with a more “reasonable” examination frequency.  A white paper is being revised to support the new examination frequency.

 

3. A presentation on the proposed Code Case for repairing small-bore nozzles using a mechanical nozzle seal assembly (MENSA) was presented and discussed.  The item passed WGISC.  It will be letter balloted to SGWCS.

 

4. Proposed revision to Code Case N-586, Alternative Additional Examination Requirements for Class 1, 2, and 3 Piping, Components, and Supports.  This revision incorporates NRCs concern/comments.  The revision requires the root cause evaluation to consider other piping systems than the one containing the original flaws or relevant conditions.  The Code Case revision is at BNCS.  The Code revision is on hold until the Code Case revision is approved by the BNCS.

 

5. Proposed Code Case (N-711) using risk insights to determine the minimum required examination coverage for Class 1 and 2 piping welds.  Passed SGWCS.  This item will not proceed to SCXI.  NRC will be given time to review and provide comments.

 

6. Proposed Code change to perform visual examination of Regenerative and Residual Heat Exchanger in lieu of volumetric and surface examination.  Very good code change for those of you who can not exempt these heat exchangers due to size and Code class.  Passed WGISC.  Passed SGWCS.  Goes to SCXI.

 

7. Proposed Code Case N-526 and Code change to eliminate the requirement to perform successive examinations on flaws that are not service induced.  Passed WGISC.  Goes to SGWCS.

 

8. Proposed Code change to address Stepped Bolting.  Current code does not address this bolting configuration.  Do we have any at PGN plants?  Passed WGISC.  Goes to SGWCS.

 

9. Proposed Code Case (N-666), Weld Overlay Repair of Defects in Socket Welds.  This Code Case allows weld reinforcement of defective socket welds.  Received a negative vote from NRC at SCXI.  NRC would like the Code Case to put the indication in compression with the weld overlay.  The Code committee is working with the NRC to resolve the issue.

 

10. Revision to Supplement 11 – Qualification Requirements for Full Structural Overlaid Wrought Austenitic Piping Welds.  Revise Supplement 11 to realign it with the Performance Demonstration Initiative Program and the current Relief Requests submitted by utilities.  The revision better defines thickness tolerances, use of alternative flaws, application of grading units, flaw distribution, depth sizing, and procedure qualification requirements.  Approved by BNCS.

 

11. Revision to IWA-2316 and IWA-2317, Alternative Qualifications for VT-2 and VT-3 Examination Personnel.  Code paragraphs revised to address NRC limitations.  IWA-2316 was revised to limit its use to personnel performing system leakage or hydrostatic tests.  IWA-2317 was revised to require written tests for initial qualification and every 3 years thereafter.  Approved by BNCS.

 

12. Revise Code Case N-416-3 to remove Section III NDE Requirements.  This activity revises Code Case N-416-3 to remove specific 1992 Edition Section III NDE requirements (make it look like current Section XI requirements) that are in addition to the original Construction Code NDE already required by Section XI.  Passed BNCS.  It should be published in the next Supplement.

 

13. Proposed Code Case N-731, Alternative Class 1 System Leakage Test Pressure Requirements.  This new proposed Code Case allows Class 1 system leakage test pressure to be lowered for portions of Class 1 safety injection systems where the portions are continuously pressurized during an operating cycle.  Out for letter ballot at Standards Committee.

 

14. Appendix I - Ultrasonic Examinations.  Two major changes are proposed.  First, the current Appendix does not define the coverage requirements for dissimilar and overlaid piping welds and the nozzle inside corner region.  Second, many utilities are submitting for relief to use Appendix VIII qualified procedures for examination of the RPV flange welds and other vessel welds, in lieu of Article 4 Section V.  The proposed revision allows for the use of Appendix VIII qualified procedures without the need for relief, and without the need for examinations from the flange face or seal surface.  Out for letter ballot at Standards Committee.

Inquiry Session

Note:  To expedite the Code Inquiry process, all inquiries must be received by the ASME office (Shannon Burke, Secretary) two weeks prior to the Code meeting.

 

The following Requirement Inquire was approved.

1. Q.  Is it a requirement of IWA-5250(a)(2), to perform a VT-3 visual examination on bolting that is being discarded?

 

Reply.  YES

The following Intent Inquiries was approved by SCXI.  (Note 1:  Intent Inquires require approval of SCXI members, and need accompanying code change.  Note 2:  Occasionally, Requirement Inquires goes to SCXI because the inquiry did not get a unanimous vote at Inquiry Session.).

 

1. Q.  Is it the intent of Examination Category B-G-1, Item No. B6.50, that reactor vessel bushings be examined when the head to flange connection is disassembled, and the studs remain in place?

 

Reply.  NO

2. Q.  Is it the intent of IWA-4600(b)(2), that the requirements of IWA-4610 (which includes 350 F preheat) apply when Butter Bead welding rules of IWA-4650 are used to weld Class MC vessels or Class CC metallic liners?

 

Reply.  NO.  Clarification appears in the 2004 Edition.

 

3. Q.  Is it the intent that when an inservice examination of a component support reveals conditions described in IWF-3410(a) or -3410(a), and the component support has been analyzed and/or tested to substantiate its integrity for its intended service, and has been found to be acceptable, that additional support examinations be required by IWF-2430 or -2430 or successive examinations be required by IWF-2420(b) or -2420(b) when an Owner chooses to perform corrective measures for the purpose of restoring the support to its original design condition?

 

Reply.  NO


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