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ASME Section XI Meeting Notes - May 2002

Site Updates


Introduction

Prepared By: Dajun Song

Company: Progress Energy

Meeting Dates: April 29 - May 2, 2002

Meeting Location: Colorado Springs, Colorado

 

Meeting Notes

General Announcements

1. Next Section XI meeting is in Hollywood, FL. The Westin Diplomat Hotel & Spa (888) 627-9057. $189.00/night. Please make your reservations as soon as you can.

2. NRC Report

- IST/NRC Symposium in Washington, DC on 7/15/02 – 7/17/02.

- ISI/NRC Symposium in Washington, DC scheduled for July 2003 has been cancelled. It will be rescheduled for July 2004.

- Draft proposed regulation (10 CFR50.69) is out for public comment. This regulation is titled, "Risk-Informed Treatment of Structures, Systems and Components." This proposed regulation would greatly reduce some current regulatory requirements for Risk-Informed Safety Class (RISC) 3 & 4 components. The following requirements would be exempted; Part 21, EQ, IST/ISI/R&R requirements for ASME Class 2 and 3 components, Appendix B, Appendix J (Type B and C for both Options A and B), and Appendix A to Part 100. This regulation has huge potential for cost savings to utilities, if we choose to embrace Risk-Informed technology.

- Final rule (50.55a) will be published around September 2002.

- Final Code Case Regulatory Guide will be published end of 2002. Don’t hold your breath. More likely date will be late first quarter of 2003.

- PRA Standard. The NRC has been working with the ASME and the other stakeholders to reach a consensus on a standard for PRAs. The ASME Standards document will help define the quality of PRAs to be used in applications to satisfy risk-informed regulations. Use of this Standard will diminish the need for staff review of PRAs, and provide uniformity and consistency of staff review when it is determined that a detailed review is necessary. The standard was considered by the BNCS in Standards Action No. 868, dated January 11, 2002. The NRC has no objection to the standard being published, but as discussed in a letter from Scott F. Newberry, Director, Division of Risk Analysis and Applications, Office of Nuclear Regulatory Research, to G. M. Eisenberg, Secretary, Committee on Nuclear Risk Management, the NRC staff expects to endorse the PRA standard with some exceptions. ASME published the PRA standard on April 5, 2002. The NRC staff expects to publish with a 90-day public comment period a regulatory guide endorsing the PRA standard in August 2002. A public meeting would be held in October 2002.

3. Robin Dyle has resigned as Vice-Chairman of Subcommittee Section XI. It appears that Bill Holston of Calvert Cliffs (BG&E) will succeed Robin.

4. Code Committee is looking at situations where the Code Committee approves and publishes a Code Case that the NRC does not like. They will try to address this issue. (Does it make sense to approve Code Cases and incorporate it into the Code when the NRC objects to the Code Case?)

5. In the future, there will be 1 Code Edition and 2 Code Addendum.

6. ASME Web site. Password required to access 2nd tier of ASME web page.

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

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. It was decided by the TG that Section III Code Case would be the bases for use/relief. Development of Section XI Code Case is on hold. The Section III Code Case received 2 MC negatives (these have been resolved). It was letter balloted, and received one MC letter ballot. The author of the code case is trying to resolve the MC letter ballot. The Section XI TG has two issues to address concerning the Section III Code Case. They are: 1) Acceptance standard based on fracture mechanics? Section XI and III do not agree on this issue. 2) Material. Section III Code Case excludes certain material from the Code Case. The latest Section III Code Case will be discussed at the next meeting. The TG will attempt to document NRCs position on the Section III Code Case. This will be the bases for utilities relief.

2. Task Group on Alloy600/182 Cracking is still working on modifying the code to address this issue (type of examination and frequency). Robin Dyle and code committee volunteers will meet this summer to write a draft code requirements. The draft will be brought forward at next Section XI meeting.

3. Risk-Informed Containment Examination. The charter of this Task Group is to advance the use of risk-informed and performance-based methodologies to determine the appropriate examination requirements for containments. The focus of this meeting was to finalize the Task Group’s Charter and membership. At the next meeting, this Task Group will conduct a joint meeting with the Working Group - Implementation of Risk Based Examination.

4. Code revision - Thermal Fatigue Criteria for Examination of Class 1 Piping Welds. This change will require examination (UT) of HPSI welds that between the pipe diameter of > 1-1/2" and <4". 10% sample will be required. Reaffirmed at both WGISC and SGWCS. Passed SC XI. Goes to MC.

5. Proposed Code Case (N-662), Alternate Requirements for Class 1 and 2 Surface Examinations. This code case limits the surface examination to welds that are susceptible to OD attack. Letter balloted at MC with 3 negatives. Two out of 3 negatives have been resolved. Item goes back to MC as second consideration. It should pass MC. (NOTE: To satisfy NRC negative, this code case limits the use to Class 1 piping to > 4"). No size limit for Class 2 piping. Very good code case.

6. Examination Requirements for Multiple Integral Welded Attachments on One Unique Vessel. This proposed code change and Code Case clarifies examination requirements for integral attachment to vessels. "For single vessels, only one welded attachment shall be selected for examination. The attachment selected for examination … shall be an attachment that serves as a support load path during normal system operation." Good Code Case. Passed WGISC. Discussed at SGWCS with no action taken.

7. A new item to clarify code requirement was brought forward. Note 2 in Examination Category B-G-2 lists components subject to examination. Is steam generators part of note?

8. Another new item to clarify code requirement was brought forward. Note 2 in IWC-1221 and Note 1 in IWD-1220 defines "In piping." When calculating cumulative inlet and cumulative outlet cross-sectional area, do you separate the shell side from tube side? Also, when calculating the cross-sectional area, do you use OD, ID or NPS?

9. Proposed Code Case (N-658), Risk Informed Safety Classification for Use in Risk-Informed Repair and Replacement Activities. Passed MC. Goes to BNCS.

10. Proposed code change to IWL-2510(b) to provide requirements for additional surface examinations of tendon anchorage suspect areas. Item is out for letter ballot in MC.

11. Proposed Code Case, Alternative Hydrostatic Pressure Test Schedule Requirements for Class 1, 2, and 3 Systems. This code case allows utilities to perform the 10-year hydrostatic test any time within the interval, provided the test is performed in the same or earlier inspection period in each subsequent inspection interval. Received several SC XI negatives. Trying to resolve them.

12. Proposed Code Case N-660, Alternative Repair/Replacement Rules for Structures Systems Components (SSC) Classified in Accordance With Risk Informed Process. This action implements the revised special treatment requirements for repair/replacement activities that are performed on items that have been classified by risk informed methodologies. Passed SC XI. Goes to MC.

13. This item incorporates Code Case N-616 into the code. This Code Case allows VT-2 examination to be performed on systems borated for the purpose of controlling reactivity to be performed without insulation removal of the bolted connection, if the bolted material is resistant to boric acid corrosion. Very good Code Case. This Code Case is listed in NRC Reg. Guide for "Conditionally Acceptable Section XI Code Cases."

14. This item incorporates Code Case N-602 into the code. This Code Case allows the procurement of Code material by Owners and Repair Organizations as long as they comply with IWA-1400(n) (i.e., App. B or NQA-1). This is beneficial to plants built to B31.1 and B31.7. Very good Code Case. Passed SC XI. Side note – this Code Case has drawn objections from manufactures ("N" stamp holders) and accreditation folks. They object to the Code Case for obvious reasons. They will take their case to BNCS on 6/13/02 in Minneapolis. Subcommittee XI will counter at this meeting. The Code Case has not been published yet.

15. SGWCS voted to annul Code Case N-311. Goes to next SCXI meeting.

16. Repeat - The NRC did not approve Code Case N-648, Alternative Requirements for Inner Radius Examinations of Class 1 Reactor Vessel Nozzles because the acceptance criteria referenced in the Code Case was wrong. Also, NRC is strongly urging utilities to use 1 mill wire for visual qualification. Code committee will revise the code case. Meanwhile utilities can submit relief with the correction/provision, and should have no problem getting approval to use the code case

17. Repeat 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.

18. Repeat Proposed Code Case – Alternate Examination Requirements for BWR RPV Shell Welds. This Code Case incorporates recommendations of BWRVIP-05. Action is still waiting for the White Paper before it can proceed. Still waiting.

19. Repeat Mr. Owen Hedden of Westinghouse is working on a Code Case 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, B-F, B-J, B-K, and B-N. White Paper is written. Oh, by the way this is for only PWRs. It looks very promising.

20. Repeat 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). At our next meeting, we need to discuss this issue. We have 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. Question: Is it a requirement of IWA-5214(e) to pressurize replacement items installed by mechanical means that are not subject to pressurization during a Class 2 System Functional or In-service Test?

Reply. NO.

The following Intent Inquires was approved (by SC XI). (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 IWE-2500(c)(1) that a VT-1, Visual Examination need only be performed on one side of a component if only that side is subject to augmented examinations?

Reply: YES. IWE-2500(b)(1), 2001 Edition provides clarification for surface areas requiring augmented examination.


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