Federal Regulations, Codes, & Standards
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ASME Section XI Meeting Notes - February 2004
Prepared By: Dajun Song and Jerry Crider
Company: Progress Energy
Meeting Dates: February 23 - 26, 2004
1. Next Section XI meeting is in
2. NRC Report.
· Next Draft Reg. Guide (Revision 14) will be published for public comment in April 2004. This will cover up to Supplement 6 of 2001 Code Cases.
· The NRC staff has completed its formal review of the changes to the ASME Code incorporated into the 2001 Edition through the 2003 Addenda. The proposed rule was published for public comment on January 7, 2004. Public comments must be submitted by March 22, 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 will be held sometime in 2005. Jack Spanner will serve as the chairman.
5. Snubber testing portion in IWF-5000 will be removed from Section XI. Testing will be covered by ISTD. The visual examination will stay in Section XI.
Code Committee Protocol
A quick lesson on code committee protocol. 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. Incorporated comments from letter ballot. The Draft code was presented to SG NDE and RRM. Item passed SG NDE. Will be on SCXI agenda for May 2004 meeting.
2. Task Group on Boric Acid. Task Group focused on two major areas – the ability to detect leaks in borated systems and actions taken when a leak is identified. A code change to address “evaluation and corrective actions” was presented to WGISIO. Comments from WGISIO will be incorporated, and be brought back to WGISIO in May 2004 meeting. However, the “evaluation and corrective actions” portion of the TG action will be put on “hold” until similar action in WG Pressure Test goes through the Code Committee. Additionally, the task group will meet with Alloy 600 TG to develop visual examination requirements (VT-2 vs. VT-5, and frequency).
3. A presentation on the proposed Code Case for repairing small-bore nozzles using a mechanical nozzle seal assembly (MNSA) was presented and discussed. Currently, the NRC considered the use of a MNSA as a temporary repair (based on discussion, the NRC does not believe that ASME Section III addresses this application). For clarification, several inquiries have been approved saying that Section III does allow the use of a MNSA. Based on the discussions, the SG agreed to form a new Task Group to address the use of a MNSA. The Task Group’s actions are to draft an inquiry on whether Section XI allows its use and, then evaluate whether further Code action is required.
4. Proposed code change and code case (N-702). This item reduces the BWR IRS and
nozzle-to-shell welds exam from 100% to 25%.
In addition, for IRS, VT-1 can be used in lieu of volumetric
exam. It excludes feedwater
nozzles and operating control rod drive return line nozzles. Again, the issue is whether or not this
item should include 1 mill or 0.5 mill wire for VT-1 exam. This item received 5 negative Letter Ballots
at Standards Committee (Main Committee).
The negatives were addressed and reaffirmed at SCXI. One lone negative at SCXI was Mr. Norris of
NRC (the code cases does not address 1 mill or 0.5 mill wire for VT-1
exam). The Code Case was approved by
5. 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. Passed SCXI. Out for letter ballot at Standards Committee.
6. Proposed code change (IWX-1220). This action is to revise the exemption criteria to clarify that the primary and secondary sides of heat exchangers are to be handled separately, and clarify that components surrounded by exempt components are themselves exempt. Passed Standards Committee. At BNCS.
7. Mr. Owen Hedden of Westinghouse is working on a Code Case (N-691) to extend the 10-year interval RPV ISI exams by 10 or more years. This means performing the RPV exams once every 20 years. The weld category includes B-A, B-D, and B-J. White Paper is written. Pilot plants have been identified. This item passed Standards Committee (Main Committee). The NRC would like to see the pilot plant study before passing judgment. This looks very promising. Passed BNCS. Published in Supplement 11.
8. Proposed code case to eliminate surface examination of Class 1 socket welds that are not susceptible to outside surface attack. Item passed WGISC. SGWCS decided to incorporate this item into Code Case N-663. Passed SGWCS. At SCXI. Good Code Case for those who are not going to implement RI-ISI.
9. An item to clarify code and Code Case (N-652) requirements. Basically, it clarifies that bolting on all steam generators require examination. The code and Code Case imply otherwise. This item (code change and Code Case revision) passed Standards Committee. At BNCS.
10. Proposed code case using risk insights to determine the minimum required examination coverage for Class 1 and 2 (3, if using Risk-Informed ISI) piping welds. Passed SGWCS. At SCXI.
11. Proposed Code change to perform visual examination of Regenerative and Residual Heat Exchanger in lieu of volumetric and surface examination. At WGISCS for further discussion. Very good code change for those of you who can not exempt these heat exchangers due to size and Code class.
12. Proposed Code Case and Code change to eliminate the requirement to perform successive examinations on flaws that are not service induced. At WGISC.
13. Proposed Code change to address Stepped Bolting. Current code does not address this bolting configuration. At WGISC.
14. Action item to request NRC remove limitation on use of IWB-1220(d). This limitation is stated in 10CFR50.55a(b)(2)(xi). Letter was forwarded to SCXI for approval.
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.
Reply. YES, however Code Case N-566-2 provides an alternative.
Reply. NO. Where electronically controlled authorization procedures are implemented, such electronic authorization/signature is an acceptable means of certification.
The following Intent Inquiries was approved by SCXI. (Note 1: Typically Intent Inquires require approval of SCXI members, and need an accompanying code change. Note 2: Occasionally, Requirement Inquires goes to SCXI because the inquiry did not get a unanimous vote at Inquiry Session.).
Reply. YES. IWE-2500(b)(1), 2001 Edition, provides clarification for surface areas requiring augmented examination. (NOTE: This intent inquiry is a revision to already published inquiry, XI-1-01-49)
Reply. NO (NOTE: Did not receive unanimous vote at Inquiry Session)