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Section XI Meeting Notes - August 2001

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Introduction

Prepared By: Dajun Song

Company: Progress Energy

Meeting Dates: August 6 - 9, 2001

Meeting Location: Vancouver, British Columbia

 

Meeting Notes

General Announcements

1. Next Section XI meeting is in Boca Raton, FL. Boca Raton Hotel (888) 503-2622. $171.00/night (12/10/01 – 12/13/01) Please make your reservations by 11/19/01.

2. NRC Report

- Proposed Rule was published on August 3, 2001. 90-day public comment period ends on 10/17/01.

- Code Case Reg. Guides. Four Reg. Guides (III, XI, O&M, and Unacceptable Code Cases) will be published for public comment in early October.

- New Licensing section within in the NRC has been formed. They are meeting with a utility (Excelon) at least once a month to discuss licensing of Pebble Bed Reactor. Also, there are lots of interest in AP-1000 design from the industry. NRC expects new license request within next 2 years.

3. ASME web site. For latest Code committee activities. Member ID and Password required.

4. Task Group on ISI Optimization will be elevated to Working Group or Special Working Group status. This means that all TG members will get free Code books.

5. Section XI will look at addressing Code inspection requirements for Pebble Bed reactor.

6. ISI/NRC Symposium was a great success. Next one is scheduled for 2003 in Cleveland, OH.

7. Task Group on Cast Stainless Steel. Code Case was developed (similar to pump casing weld) to address examination. Still waiting input form SGE&S.

8. WG on Risk Based Inspection. Working on 2 major Code items. Developing a Non-mandatory Appendix that incorporates Code Cases N-577 and N-578 (EPRI and Westinghouse methodology), and Code boundary classification using Risk Based Methodology.

9. Task Group on ISIO. Working on changing Code words to address on-line ISI, and address aging management in the Code.

10. SC XI is forming a TG to codify examination requirements for CRDM head penetrations. They are looking for volunteers. It would be beneficial to participate. However, this will require addition time and travel.

11. In the future, there will be 1 Code Edition and 2 Code Addenda.

12. The following Code Cases were reaffirmed;

N-498-4, N-515, N-522, N-533-1, N-616, N-590, N-591, and N-630

13. The following Code Cases were voted to expire;

N-479-1, N-495, and N-560-1

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 – Main 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";

TGISIO – ISI Optimization

WGISC – Inspection of Systems and Components

WGRBI – Risk Based Inspection

WGPT – Pressure Test

WGIWE/IWL – Containment

WGGR – General Requirements

SG WCS – Water Cooled Systems

SGNDE – Nondestructive Evaluation

SGRRM – Repair, Replacement, and Modifications

SCXI - Subcommittee Section XI

Code Committee Items

1. Task Group on Alternative NDE Methods for Repair/Replacement/Modification (RRM) Activities. The TG was formed recently. Approved the charter for the group, and is in the process of writing a white paper to address scope of the TG. The white paper will address 8 major points.

    • Acceptance standard (*)
    • Performance demonstration (*)
    • Section XI examiners are not required to detect fabrication flaws
    • Exam volume. Is XI volume sufficient? (*)
    • Comparison of RT vs. UT
    • Type of NDE required (B31.3 and B31.7)
    • Reconciliation of construction code NDE requirements
    • Benefits of development of new requirements (*)

Identified high priority (*) items. Basically the TG is looking at performing one NDE to satisfy both the construction code and XI requirements. I shared with the TG our experience with the NRC. They were very interested. They were surprised that the NRC wanted a PDI type program to satisfy construction code requirements. Several action items were assigned, and will meet again in December.

2. Proposed Code Case, Risk Informed Safety Classification for Use in Risk-Informed Repair and Replacement Activities, was letter balloted in SCXI. SGWCS addressed all the negative ballots and voted to approve the item. It goes to SCXI in December.

3. Proposed Code Case, Alternate Requirements for Class 1 and 2 Surface Examinations. This code case limits the surface examination to welds that are susceptible to OD attack. After a lot of discussion, item passed SGWCS. Goes to SCXI.

4. Proposed Code Case that revises the current (1992 Edition and beyond) VT-2 and VT-3 requirements back to the level stipulated in 1989 Edition (or similar). In later Editions of the Code, the VT-2 and VT-3 has gotten more stringent. Item goes to SCXI.

5. Code Case N-613, Ultrasonic Examination of Full Penetration Nozzles, Examination Category B-D, Item No’s. B3.10 and B3.90, Reactor Vessel-To-Nozzle Welds, Fig. IWB-2500-7(a), (b), and (c), Section XI, Division 1, is being revised to be consistent with the Regulation. Currently, the scanning requirements are different. Goes to SCXI in December.

6. Proposed Code Case, addresses alternative examination requirement for bolting (B-G-1, B-G-2, and C-D). It clarifies selection criteria, and provides consistency between the Class 1 and Class 2 examinations. Also, it allows surface examination of bolting in lieu of volumetric examination when bolting is removed (such as RPV studs). It passed BNCS, and will be published. Good Code Case to look into.

7. Code revision to incorporate Class 2 set-on nozzle configuration with austenitic material passed BNCS. Published in 2002 Addenda.

8. Proposed Code Case, Alternative to Subarticle IWE-5240, will be published in 2001 Edition. This Code Case provides an alternative to the current VT-2 requirement in IWE-5240.

9. Proposed Code Case on Alternative to Augmented Examination Requirements of IWE-2500 will be published in 2001 Edition. This Code Case provides an alternative to visual and ultrasonic thickness measurement examination requirements of IWE-2500.

10. Proposed Code Case N-307-3, Alternative Rules for the Examination of Bolting. This Code Case allows utilities using earlier Additions of the Code to choose either volumetric or surface examination (or eliminates surface examination) on RPV studs. Item passed BNCS.

11. Proposed Code change. Adds the following words to the open flow path test, "Test personnel need not be qualified for VT-2 examination." At MC.

12. Code change to address augmented examination requirements for concrete containments following repair/replacement activity. This change mostly applies to plants that have post-tensioning systems that may replace their SG, and must cut some tendons. Item received one negative at MC, reaffirmed at SCXI. Item goes back to MC.

13. Proposed Code Case to eliminate surface examination of socket welds. Item failed SCXI. WGISC decided to add additional VT-2 examination to the proposed Code Case and discuss at December WG meeting.

14. TGISIO is working on an item to eliminate volumetric examination of Regenerative (Regen.) and Residual Heat Removal (RHR) Heat Exchangers, and replace with VT-2. Some utilities already have relief to perform VT-2, and some exempt the Regen. based on size (if it’s Class 2). An opportunity to save on dose.

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. Does the procedure demonstration of IWA-2210(b), Table IWA-2210-1 determine the visual acuity of the examiner by resolving the selected test chart characters of a specified height at specified maximum distances i.e., VT-1 at 2-feet, VT-2 at 6-feet, and VT-3 at 4-feet?

Reply: NO, IWA-2210(b) is only for procedure demonstration.

2. Question: Does the procedure demonstration of IWA-2210, Table IWA-2210-1 verify the illumination adequacy by resolving the selected test chart characters of a specified height at specified maximum distances i.e., VT-1 at 2-feet, VT-2 at 6-feet, and VT-3 at 4-feet?

Reply: YES.

3. Question: Is it a requirement of IWF-1230 and IWF-2510 that, for a nonexempt, non-multiple components other than piping that is not required to be examined (such as a large Class 2 pump with no casing welds), the supports of that component are subject to examination in accordance with Table IWF-2500-1?

Reply: YES.

4. Question: Is it a requirement of Table IWB-2500-1, IWC-2500-1, and IWD-2500-1, that, for nonexempt, non-multiple pump and valves that is not required to be examined (such as a large Class 2 pump with no casing welds), all support attachment welds are required to be included in the population to be sampled at a rate of 10% (in accordance with Category B-K, Category C-C, or Category D-A, as applicable) of the percentage of supports required by Table IWF-2500-1?

Reply: YES.

The following Intent Inquires was approved. (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. Question: Is it the intent of Section XI, Subsection IWL to require that a pre-service examination of the affected area of a concrete containment be performed following a repair to the concrete if (a) the concrete repair is limited to the cover concrete external of the outermost layer of structural reinforcing steel, (b) no reinforcing steel is exposed, (c) the structural integrity of the containment in the existing un-repaired condition has not been reduced below that required by the original design criteria, and (d) there is no evidence of damage or degradation sufficient to warrant further evaluation or repair?

Reply: NO.

2. Question: Is it the intent of IWC-2412 that the percentage requirements of Table IWC-2412-1 apply to Category C-H?

Reply: NO.

3. Question: Is it the intent of IWD-2412 that the percentage requirements of Table IWD-2412-1 apply to Category D-B?

Reply: NO.

4. Question: Is it the intent of IWA-2210 that the vision test chart used for the procedure demonstration contains only lower case characters without ascenders or descenders?

Reply: NO.

5. Question: Is it the intent of IWA-2210 that resolving the specified characters in Table IWA-2210-1 can be used in lieu of lighting intensity measurement to verify illumination adequacy?

Reply: YES.


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