ML20247L155
| ML20247L155 | |
| Person / Time | |
|---|---|
| Issue date: | 05/18/1998 |
| From: | Wang E NRC (Affiliation Not Assigned) |
| To: | Essig T NRC (Affiliation Not Assigned) |
| References | |
| PROJECT-694 NUDOCS 9805220325 | |
| Download: ML20247L155 (38) | |
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1 UNITED STATES 1
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NUCLEAR REGULATORY COMMISSION l
4" WASHINGTON D.C. 20066 0001 l
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May 18, 1998 MEMORANDUM TO: Thomas H. Essig, Acting Chief Generic Issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation FROM:
Egan Y. Wang, Reactor System Engineer E T-Generic Issues and Environmental Projects Branch Division of Reactor Program Management j
Office of Nuclear Reactor Regulation i
SUBJECT:
MEETING
SUMMARY
OF MAY 7,1998 WESTINGHOUSE OWNERS GROUP (WOG) REGARDING CRACKING IN PART LENGTH CONTROL ROD DRIVE HOUSING On May 7,1998, representatives of WOG met with representatives of the Nuclear Regulatory Commission (NRC). Members of the public, Westinghouse and utility representatives were a!so i
. present. The purpose of this meeting was to inform the NRC of the present activities with l
respect to the part length control rod drive mechanism (CRDM) housing cracking issue and preliminary part length CRDM inspection results. Attachment 1 lists the meeting attendees. is a copy of slides presented by WOG.
WOG established a subgroup to addressed the issue of part length CRDM cracking. This subgroup consists of representatives from various utilities and Westinghouse. The program objectives for the subgroup are to: establish a technical basis to support continued safe operation with the present hardware configuration, support the conclusion that the part length CRDM cracking issue is an isolated event which occurred during the fabrication process, address all materials in service, and support utilities in timely resolution of WOG action plan.
WOG representatives discussed the subgroup's program description and current activities.
There are two types of part length CRDMs - 309 stainless steel (309-SS) and alloy-82. WOG representatives indicated that currently the total population of 309-SS part length CRDMs contains 137 part length CRDMs installed and additional five as spares in various plants. For alloy-82 part length CRDMs, there are 51 installed and 13 spares in various plants. As of April 1998,36 welds on 309-SS part length CRDMs have been inspected. Cracking was Identified in one of the welds. Eight alloy-82 part length CRDMs welds were inspected with no f
l flawed part length CRDM identified.
/
I WOG representatives discussed a part length CRDM statistical evaluation. The objective of this evaluation isJp determine the minimum additional sampling required by the WOG members to demonstrate a stipulated ievel of assurance that the fraction of remaining part length CRDM
[
welds containing an unacceptable pre-service flaw does not exceed a specific quality level.
Based on the statistical model presented, WOG representatives concluded that no further i
sampling was required in either type of welds to demonstrate 95 percent quality with at least 95 percent assurance, g g S Ef6 T B q##
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l Thomas H. Essig
-2 May 18,1998
' Utility representatives indicated that they are planning to inspect pad length CRDMs in the l
upcoming refueling outages. One of the considerations of inspecting pad length CRDMS is the trade-off between minimizing radiation exposure of plant staff and inspection of part length CRDMs. They stated that if the methodology proposed by the WOG is' acceptable, utilities will not have inspect these part length CRDMs. Therefore, a feedback from the staff is requested -
, by representatives of WOG and utilities.
The staff questioned the validity of the statistical model presented by the WOG representatives.
The assumption for the statistical model presented was that the flaw is totally random. The staff raised the concem on the possibility that this pre-fabrication may not be totally random.
' Should this be the case, inspection of 36 sampling points (out of a total of 282 welds) would not
' be sufficient to demonstrate a 95 percent quality with at least 95 percent assurance. The NRC staff indicated that the WOG should confirm the randomness of this failure by examining more part length CRDMs to increase the sampling size. The staff also stated that there was a need j
' to discuss this issue with NRC management.
. Both the staff and the WOG representatives agreed that a future meeting on this subject should be held. Tentative date for this meeting is set to be June 11,1998. The staffindicated that the WOG should submit a program plan that describes actions that will be taken in case additional failures are identified.
' After discussing WOG's proposal for limiting the scope of inspections based on statistical l
arguments, the staff had a conference call with WOG representatives on May 13,1998. During that phone call the staff indicated that discussions were held with NRC management and that management was in agreement with concerns that the staff has with the WOG proposal.. The primary issue of concem relates to the inspection of the 309-SS welds. The WOG subgroup proposed that an adequate number of welds have already been inspected since the results of l
_ the 36 weids that have been inspected are sufficient to conclude that there is 95 percent confidence that 95 percent of the welds do not have flaws of interest. This is equivalent to the
' statement that there is high confidence that no more than five percent of the welds have flaws of interest. The staff that this standard is unacceptable for these welds. The staff indicated that a more appropriate way to look at statistical arguments would be to ask: what is the probability L
that one or more welds have flaws of interest, given the inspections performed to date? The j
staff believes that this probability would tum out to be quite high. This leads us to the conclusion that the sample of welds chosen will not provide adequate assurance of the integrity of the part length CRDM 309-SS welds and furthermore that a sampling approach will not work.
The staff indicated that the flaw found is one of the most serious reactor coolant pressure boundary flaws that we have ever experienced and that the only approach that the staff E
believes will provide assurance that any more flaws of the type found at Prairie Island are not
(,
present would be to inspect or remove essentially all of the 309-SS welds.
l
Thomas H. Essig May 18, 1998 The staff also indicated that since the problem was found in the 309-SS welds, that a similar flaw has not been found in the alloy-82 welds inspected to date, and that since the alloy-82 welds would be expected to be less susceptible to hot tearing, the staff believes that a sampling approach may be acceptable for alloy-82 welds. The staff indicated that the staff had not reviewed in detail the statistical arguments presented during the May 7th meeting. However, from an engineering judgement point of view, examination of only 8 out of 128 of the alloy-82.
l welds does not appear to be adequate and a considerably larger sample should be inspected.
l l
The staff requested that the WOG subgroup to indicate in a subsequent phone call on l
approximately May 19,1998 to confirm a June 11 date for a meeting, or to provide an attemate date. The meeting would provide what steps the WOG intends to take in view of the staff's conclusions regarding their proposed inspections.
l Attachments: As stated cc w/att: see next page Project No. 694 l
l l
i
Thomas H. Essig May 18,1998 The staff also indicated that since the problem was found in the 309-SS welds, that a similar flaw has not been found in the alloy-82 welds inspected to date, and that since the alloy-82 welds would be expected to be less susceptible to hot tearing, the staff believes that a sampling approach may be acceptable for alloy-82 welds. The staff indicated that the staff had not reviewed in detail the statistical arguments presented during the May 7th meeting. However, from an engineering judgement point of view, examination of only 8 out of 128 of the alloy-82 welds does not appear to be adequate and a considerably larger sample should be inspected.
Tha staff requested that the WOG subgroup to indicate in a subsequent phone call on approximately May 19,1998 to confirm a June 11 date for a meeting, or to provide an alternate date. The meeting would provide what steps the WOG ir.tends to take in view of the staff's conclusions regarding their proposed inspections.
Attachments: As stated cc w/att: see next page Project No. 694 Document name: 980507MT. SUM
- See previous concurrence OFC PGEB SC:PGEB EMCB AC:PGES TEssig h NAME EWang:sw FAkstulewicz*
RHermann*
DATE 05/18/98 05/18/98 05/14 /98 05/t8 /98 OFFICIAL RECORD COPY
NRC/ WESTINGHOUSE OWNERS GROUP MEETING LIST OF ATTENDEES May 07,1998 NAME ORGANIZATION Wang, Egan NRC/NRR/PGEB l
Sullivan, Ted NRC/NRR/EMCB Thomas, Scott NRC/ Rill Benedict, Robert NRC/NRR/PECB McNeil, Micheal NRC/RES/EMMEB Hermann, Robert NRC/NRR/EMCB Schapker, Jerry NRC/ Rill Whitaker, David Duke Power Jacobs, Karl New York Power Authority /WOG Borsum, Bob B&W Owners Group Schoppman, Mike Florida Power & light Co.
Elder, Gary Westinghouse Boyle, D. E.
Westinghouse Herrera, Marcos Bennetch, Jim Virginia Power Campbell, David Westinghouse Lareau, John ABB l
Hiruo, Elaine Nuclear Fuel Bishop, Bruce Westinghouse Bamford, Warren Westinghouse Walker, Stan EPRI Schwartzwalder, Mike AEP - D.C. Cook Plant Pisavsky, Frank AEP - D.C. Cook Plant Huminski, Ted Carolina Power & Light Woods, Terry TVA Labott, Dick Public Service Electric & Gas l
l ATTACHMENT 1 l
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DISTRIBUTION: Mtg. Summary of May 7 Meeting with WOG Dated May_18,_1998 RD.. COP _Y ntral File Public PGEB r/f C. Hehl, RI J. Johnson, RJI J. Caldwell, Rlli T. Gwynn, RIV P. Wen E. Wang C. Craig OGC ACRS E-Mall F. Miraglia A. Thadani R. Zimmerman B. Sheron T. Martin G. Lainas M. Virgilio E. Jordan D. Matthews R. Wessman F. Akstulewicz J. Roe T. Collins E. J. Sullivan L.Lund J. Strosnider C. Carpenter (CAC)
B. Wetzel S.Long R. Hermann Y.C.Li M. Chatterton R. Benedict H. Scott 1
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cc:
Mr. Nicholas Liparulo Westinghouse Electric Corporation PO Box 355 Pittsburgh, PA 15230-0355 Mr. Hank Sepp Westinghouse Electric Corporation PO Box 355 Pittsburgh, PA 15230-0355 Mr. Andrew Drake WOG Project Manager Westinghouse Electric Corporation PO Box 355 Pittsburgh, PA 15230-0355 Mr. Sumit Ray Westinghouse Electric Corporation PO Box 355 Pittsburgh, PA 15230-0355