ML20212D566
| ML20212D566 | |
| Person / Time | |
|---|---|
| Issue date: | 09/17/1999 |
| From: | Wen P NRC (Affiliation Not Assigned) |
| To: | Carpenter C NRC (Affiliation Not Assigned) |
| References | |
| PROJECT-689 NUDOCS 9909240010 | |
| Download: ML20212D566 (18) | |
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September 17, 1999 MEMORANDUM TO: Cynthia A. Carpenter, Chief Generic Issues, Environmental, Financial v) Rulemaking Branch J: vision of Regulatory improvement Programs Office of Nuclear Reactor Regulation FROM:
Peter C. Wen, Project Manager: Original Signed By:
Generic issues, Environmental, Financial and Rulemaking Branch Division of Regulatory improvement Programs Office of Nuclear Reactor Regulation
SUBJECT:
REVISED
SUMMARY
OF AUGUST 20,1999, MEETING WITH THE NUCLEAR ENERGY INSTITUTE REGARDING INSPECTION OF HIGH PRESSURE SAFETY INJECTION CLASS 1 PIPING Representatives of the Nuclear Energy Institute (NEI), Electric Power Research Institute (EPRI), and utilities met with Nuclear Regulatory Commission (NRC) staff to discuss th7 issue regarding inspection of high pressure safety injection (HPSI) Class 1 piping on August 20,1999.
A meeting summary was issued on August 31,1999. Inadvertently, some discussion points were left out in that meeting summary. Attached is a revised meeting summary with additional information in the discussion of HPSI inspection and thermal fatigue issues that was not included in the original.
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WASHINGTON, D.C. 20555-0001 September 17, 1999 MEMORANDUM TO: Cynthia A. Carpenter, Chief Generic issues, Environmental, Financial and Rulemaking Branch Division of Regulatory Improvement Programs Office of Nuclear Reactor Regulation Peter C. Wen, Project Manager kA C. W FROM:
Generic issues, Environmental, Financial and Rulemaking Branch Division of Regulatory improvement Programs Office of Nuclear Reactor Regulation
SUBJECT:
REVISED
SUMMARY
OF AUGUST 20,1999, MEETING WITH THE NUCLEAR ENERGY INSTITUTE REGARDING INSPECTION OF HIGH PRESSURE SAFETY INJECTION CLASS 1 PIPING Representatives of the Nuclear Energy Institute (NEI), Electric Power Research Institute (EPRI), and utilities met with Nuclear Regulatory Commission (NRC) staff to discuss the issue regarding inspection of high pressure safety injection (HPSI) Class 1 piping on August 20,1999.
A meeting summary was issued on August 31,1999. Inadvertently, some discussion points were left out in that meeting summary. Attached is a revised meeting summary with additional information in the discussion of HPSI inspection and thermal fatigue issues that was not included in the original.
Attachment:
As stated cc w/atts: See next page
l MEMORANDUM TO: Cynthia A. Carpenter, Chief Generic issues, Environmental, Financial and Rulemaking Branch Division of Regulatory Improvement Programs Office of Nuclear Reactor Regulation FROM:
Peter C. Wen, Project Manager C.
Generic issues, Environmental, Financial and Rulemaking Branch Division of Regulatory improvement Programs Office of Nuclear Reactor Regulation
SUBJECT:
. REVISED
SUMMARY
OF AUGUST 20,1999, MEETING WITH THE NUCLEAR ENERGY INSTITUTE REGARDING INSPECTION OF HIGH PRESSURE SAFETY INJECTION CLASS 1 PIPING On August 20,1999, representatives of the Nuclear Energy Institute (NEI), Electric Power Research Institute (EPRI), and utilities met with Nuclear Regulatory Commission (NRC) staff at the NRC offices in Rockville, Maryland. Attachment i lists attendees at the meeting.
This meeting was requested by the NRC stWf to discuss with industry, various options for
" interim" activities regarding the irapection of high pressure safety injection (HPSI) piping prior to the conclusion of the EPRI's Materials Reliability Project (MRP) program on thermal fatigue of primary system piping. The MRP is a body representing member utilities pressurized water reactors (PWRs), EPRI, and NEl for the purpose of dealing generically with PWR-specific technical issues. In this context, interim refers to the time period prior to the completion of the MRP's two-year program to assess thermal fatigue issues in primary system piping.
I In a letter to Kurt Cozens (NEI) dated August 17,1999, the staff had proposed to pursue an option whereby licensees would be able to substitute the volumetric inspection of less than 4-inch diameter Class 1 HPSI piping for ASME Code mandated inspections of less risk significant larger diameter Class 1 piping. The staff was pursuing this option from the perspective of allowing licensees to reallocate inspection resources from less risk-significant large diameter piping to more risk-significant small diameter piping. This exchange appears to be consistent with risk-informed in-service inspection programs submitted to the staff.
i The NRC began the meeting with opening comments which stated the staff's intent with this i
proposal and the potential regulatory mechanisms for enacting it. A representative from the EPRI then made a technical presentation (Attachment 2 contains a copy of the viewgraphs) to explain the industry's position that no effective interim inspection activities could be undertaken at this time. The principle technical constraints presented were (1) small-diameter thick-walled i
piping presents a very difficult geometry for ultrasonic inspection; (2) the ability to reliably and effectively detect cracking typical of thermal fatigue darnage has not been demonstrated and would require additional training and certification of inspectors; (3) the lack of appropriate i
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4 C. Carpenter weld preparation for the welds in question would require a significant amount of grinding work to remove weld crowns in order to meet ASME Code inspection requirements and may lead to additional " indications" during inspection; (4) the inability to size indications (for analytic -
- disposition) in this geometry would result in licensees having to replace piping upon indication detection; and (5) if indications were found, licensees would be required to expand their inspection scope, possibly far beyond that originally intended by this NRC proposal.
The industry representatives also noted that part of the ongoing MRP program on thermal fatigue calls for the assessment of the inspection option and the development of procedures and guidelines for performing inspections on such small diameter pipe if inspection is determined to be a viable option. As noted in the attached viewgraphs, interim guidance regarding nondestructive examination (NDE) procedures, NDE qualification recommendations, and recommendations on the use of mockups is expected to be available from the MRP program in about 9 months. This assessment would consider the technical problems noted above and determine if appropriate solutions could be developed by refining existing ultrasonic examination techniques. The MRP program may also consider the use of other, currently-experimental volumetric examination techniques. Finally, the industry representatives pointed i
out that there could be many more welds in these lines than the staff had originally assumed, i
leading to the possibility of licensees replacing the inspection of most or all large diameter piping welds with small diameter piping inspections.
Additionally, other aspects of the HPSI inspection and thermal fatigue issues were also discussed. First, as will be noted in the Statements of Consideration accompanying the NRC staff's rulemaking on 10 CFR 50.55a, the staff has decided to defer regulatory action requiring HPSI piping inspections while waiting to evaluate the results of the MRP's program. The staff will consider the need to further modify 10 CFR 50.55a in the future based on the outcome of ongoing industry activities. Second, the staff also reaffirmed its commitment to work with the -
' ASME Code committee in developing an ASME Code Case to address the issue of volumetric examination of the Class 1 HPSI lines This commitment follows from the staff's initial
- identification of an apparent Code inspection requirement discrepancy regarding these lines in the letter of July 18,1997, from K. Wichman (USNRC) to O. Hedden (ASME). Industry
- representatives suggested that development of an ASME Code Case would be a good
. approach for addressing this issue if the outstanding technical issues can be adequately
- addressed. It was agreed that such an approach would be pursued; and the staff indicated that -
it would support this effort through participation in the ASME Code process. Finally, plans for the NRC's Office of Nuclear Regulatory Research to participate with the MRP in jointly addressing issues associated with thermal fatigue (including inspection techniques and limitations) were also discussed. Similar discussions were noted in the summary of the first NRC/NEl/MRP meeting (July 23,1999) on this subject.
'After caucusing, the NRC staff concluded the meeting by acknowledging that, in light of the new information presented by the industry, the initial staff proposal appeared to be oversimplified.
- The staff noted that the intent was not to replace all large diameter piping inspections with inspections of small diameter pipe. The staff also acknowledged that given the technical M
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I difficulties presented, additional consideration would be neded to identify appropriate actions to address the issue. The staff reaffirmed that although this degradation may not be a major I
contributor to risk, from a risk-informed perspective and maintenance of defense-in-depth, there is still interest on the staff's part in seeing the thermal fatigue issues addressed, particularly for 1
l these small diamete-tines. The staff also acknowledged that no response to the August 17, 4
1999 letter would N impected from NEl.
Attachments: As stated l
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NRC/NEl MEETING ON HPSI PIPING INSPECTIONS LIST OF ATTENDEES August 20,1999 NAME ORGANIZATION Jack Strosnider NRR/DE Bill Bateman NRR/DE/EMCB Matthew Mitchell NRR/DE/EMCB David Terao NRR/DE/EMEB Kamal Manoly NRR/DE/EMEB Peter Wen NRR/ DRIP /RGEB Michael Mayfield RES/DET/MEB Noel Dudley ACRS Dave MuJeen NEl Kurt Cozens NEl John Carey EPRI Stan Walker EPRI Ernest Thrukmorton Va Power / ASME Micha'>l Robinson Duke Power T.S. Baumstark Con Edison Sherm Shaw SCE Altheia Wyche Bechtel Power Corp.
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