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ASME Section XI Meeting Notes – May 2005

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Introduction

Prepared By:  Dajun Song and Jerry Crider

Company:  Progress Energy

Meeting Dates:  May 9 – 12, 2005

Meeting Location:  Orlando, Florida

Meeting Notes

General Announcements

 

1.    Next Section XI meeting is in Los Angeles, CA.  The meeting dates, 08/08/05 – 08/11/05.  Wilshire Grand, (213) 688-7777.

 

2.    NRC Report

 

·        Next Draft Reg. Guide 1.147 (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 scheduled for July/August 2005.

 

·        Draft Revision 15 to Reg. Guide 1.147 is nearly complete.  The guide addresses Code Cases in Supplement 7 through Supplement 12 to the 2001 Edition.  This guide will be published for public comment shortly after the Revision 14 is published final.

 

·        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.  Amendment to 10 CFR 50.55a to endorse the 2004 Edition is still under review by the NRC.  No schedule has been released for publication date of the proposed rule.

 

3.    The Code Cases will no longer have expiration dates.  The Executive Committee is looking at new rules for managing Code Cases.

 

4.    Plastic pipe - some utilities are pursuing relief requests to use plastic pipe for repair replacement activities on class 3 systems.  Section XI is establishing a Task Group to work with Section III and the SWG on nonmetallic materials to develop rules for using plastic or polyethylene pipe.  Wes Rowley will chair the task group.

 

5.    A new Task Group reporting the SG-NDE has been created to address supplemental Eddy Current examinations.  This is a method for characterizing flaws on dissimilar metal welds that have been examined from the ID.

 

Code Committee Protocol

 

A quick lesson on code committee protocol is provided.  Typically, a code item starts at Task Group (TG) level and must work its’ way through BNCS before it gets published.  Here is the pecking order.

 

TG – Task Group

WG – Working Group

SG – Subgroup

SC XI – Subcommittee Section XI

MC – Standards Committee (Items can still pass with 3 negative votes if it’s a “second consideration” vote.)

BNCS – Board of Nuclear Codes and Standards

 

Some popular “Groups”;

 

TG on Alloy 600

TG on Boric Acid Corrosion

WGISIO – ISI Optimization

WGISC – Inspection of Systems and Components

WGRBI – Risk Based Inspection

WGPT – Pressure Test

WGIWE/IWL – Containment

WGGR – General Requirements

SGWCS – Water Cooled Systems

SGNDE – Nondestructive Evaluation

SGRRM – Repair, Replacement, and Modifications

SGES – Evaluations and Standards

SCXI – Subcommittee Section XI

 

Code Committee Items

 

1.    Task Group on Alternative NDE Methods for Repair/Replacement/Modification (RRM) Activities.  Still trying to resolve an issue concerning using ASME XI acceptance criteria vs. Section III.  Still waiting for technical paper to be developed to address this issue.  Several utilities have stated that they will not use the Code Case as written (using Section III acceptance criteria).

 

2.    Task Group on Boric Acid.  Code Case N-722 has passed and is ready for publication.  This Code Case provides visual examination (bare metal) requirements for Alloy 600/182/82 components.  The TG will be disbanded at the August 2005 meeting.  A quick summary is as follows:


Each RFO:  RPV hot leg nozzle to pipe, SG hot leg nozzle to pipe, Primary side hot leg instrument connections, all Pressurizer penetrations & connections, piping hot leg instrument connections & full penetration welds.


Every other RFO:  RPV BMI


Once per interval:  All other connections and welds.

 

3.    Proposed Code Case N-729, Alternative Examination Requirements for PWR Closure Heads with Partial-Penetration Nozzle Welds.  The new Code Case provides alternative examination requirements for PWR closure heads with partial-penetration nozzles fabricated with Alloy 600/82/182 and nozzles fabricated with PWSCC resistant materials.  Item passed SCXI.

 

4.    A proposed Code Case on Alternative Examination Requirements for Vessels with Wall Thickness 2 Inches or Less.  The Code Case is different from N-435.  This Code Case uses susceptibility criteria to determine what examination requirements are appropriate.  It requires Appendix VIII when performing UT.  NRC representative on the WGISC wanted more specific reference to Appendix VIII.  Will bring back to WGISC for a vote in August.

 

5.    Code change to clarify using Gross Structural Discontinuity in selecting ISI welds.  The definition of Gross Structural Discontinuity per Section III will no longer be used for ISI weld selection.  The selection will be based sorely on stress.  Item passed SCXI.  Goes to Standards Committee.

 

6.    Proposed Code Case (N-706) 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 SCXI.  Goes to Standards Committee.

 

7.    A proposed Code Case and code change to eliminate surface and volumetric examination requirement on RPV head to flange weld.  VT-1 exam each inspection period will replace the surface and volumetric exams.  Passed WGISC.  Goes to SGWCS.

 

8.    A proposed Code Case and change to eliminate Category B-M-1 valve body weld examination.  Mr. Ken Thomas of Cooper Nuclear Station is looking for industry experience on valve body weld failures.  Please provide input to him.  The item will be brought forth once enough industry data has been gathered. @WGISC.

 

9.    Proposed Code Case (N-711) using risk insights to determine the minimum required examination coverage for Class 1 and 2 piping welds.  Passed SCXI with 3 negative votes.  Among them NRC representative.  Goes to Standards Committee.  It will probably return to WG or SG level.

 

10.  A presentation on the proposed Code Case N-733 for repairing small-bore nozzles using a mechanical nozzle seal assembly (MENSA) was presented and discussed.  The item passed SCXI and Standards Committee.  Goes to BNCS.

 

11.  Revision to Code Case N-522.  Currently this code case allows Appendix J testing in lieu of the rules in Table IWC-2500-1, Category C-H.  This revision extends this alternative to repair/replacement pressure testing.  Passed SGWCS.  Goes to SCXI.

 

12.  Proposed Code Case N-735 to eliminate the requirement to perform successive examinations on flaws that are not service induced.  The SGE&S did not want this Code Case used for piping susceptible to SCC.  Concern will be addressed, and vote will be taken in August (WGISC).

 

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.  Passed BNCS.  Will be published in Supplement 5 of 2004 Edition.

 

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.  Passed BNCS.  Will be published in the 2005 Addenda.

 

15.  Revision to Code Case N-638-1, Ambient Preheat Machine GTAW Temperbead Requirements.  This change revises the SA302 Grade B limitation and impact testing, NDE, and interpass temperature requirements.  Requirements to monitor welding process temperatures were also added.  Item failed letter ballot at Standards Committee.  Reaffirmed at SCXI.

 

16.  A proposed Code Case on Alternative Examination Requirements for BWR RPV Shell Welds (BWR VIP-05) was brought up for discussion, again.  This item was tabled for several years until a White Paper could be developed.  The item received minor editorial comments at the WGISC.  The item will be brought back at August 2005 meeting for a vote.

 

Inquiry Session

 

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

 

The following Requirement Inquires was approved.

1.    Q.  When complying with the requirements of IWA-4121(a)(2) or IWA-4131.1(a)(2) for alternative requirements for small items, may the Owner include in the calculation of makeup capacity not only the capacity of the normal reactor coolant makeup systems, but also the additional makeup capacity provided by any systems when operating in an ECCS mode?

Reply.  NO

 

2.    Q.  When a weld in an item does not satisfy the requirements of Division 1 does IWA-4160 apply?

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 ASME Section XI Table IWB-2500-1, Category B-P to specify Class 1 end of ten-year testing of the extended boundary as only being conducted following a refueling outage prior to startup?

Reply.  NO, the test may be performed anytime prior to startup at or near the end of the interval.

 

2.    Q.  Is it the intent of ASME Section XI, Appendix VI, VI-4320, 1998 Edition through the 2004 Edition with 2005 Addenda that a minimum grade of 80% be attained for each examination administered for certification of visual examination personnel?

Reply.  NO


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