ML20154K111
| ML20154K111 | |
| Person / Time | |
|---|---|
| Issue date: | 10/13/1998 |
| From: | Birmingham J NRC (Affiliation Not Assigned) |
| To: | Howell D AFFILIATION NOT ASSIGNED |
| References | |
| GL-92-01, GL-92-1, NUDOCS 9810160117 | |
| Download: ML20154K111 (3) | |
Text
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October 13, 1998 Mr. D. L. Howell, Manager Framatome Technologies, Inc.
P.O. Box 10935 3315 Old Forest Road Lynchburg, VA 24506-0935
SUBJECT:
Request for Additional Information on BAW-2325, " Response to Request for Additional Information (RAI) Regarding Reactor Pressure Vessel Integrity -
Generic Letter 92-01, Revision 1, Supplement 1"
Dear Mr. Howell:
The subject report was submitted by the B&W Owners Group Reactor Vessel Working Group, in response to plant-specific requests for additional information (RAI) regarding reactor pressure vessel integrity - Generic Letter 92-01, Revision 1, Supplement 1. In reviewing the information in the report and comparing it to prior docketed information, the NRC staff noted changes in the transition temperature shift data for certain surveillance capsules. Further review of the report found a note on page 4-5 indicating the following:
"The original Charpy-V notch impact data are based on hand-fit Charpy curves using engineering judgement; these data were re-evaluated using a hyperbolic tangent curve fitting program to achieve consistency in the interpretation of the available surveillance test data."
Regarding the implications of this note, the staff requests the following information:
- 1. Have the " original Charpy V-notch impact data," specifically, test temperature, absorbed energy, lateral expansion and percent shear, been modified by the curve fitting, or has I simply the interpretation of the 30 ft-Ib temperature arid upper shelf energy been revised g through use of the curve fitting?
- 2. How was the hyperbolic tangent curve fitting performed? Specifically:
- what software was used?
- what assumptions were made regarding the modeled behavior (e.g., specified lower shelf, flat upper shelf, etc.)?
- was a standard procedure (i.e., software and set of assumptions) used to evaluate all of the Charpy data sets, or was the evaluation made on a case-by-case basis?
- 3. What parameters from the curve fitting are used (e.g.,30 ft-Ib temperature only, both 30 ft-
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Ib temperature and upper shelf energy, etc.) and how have the results been implemented for each plant?
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D. Howfil -2 October 13, 1998
- 4. Since this new evaluation changes a basis for the RPV structural integrity for each plant, provide graphical depictions of the measured Charpy V-notch impact data and the related hyperbolic tangent curve fit to the data. Also, provide the 30 ft-lb temperatures and upper shelf energy values for unirradiated and irradiated surveillance data.
Please submit a response to this request within 60 days of receipt of this letter.
Please contact Allen L. Hiser, Jr. at 301-415-1034 or Barry Elliot at 301-415-2709 if you have ,
any questions regarding this request.
Sincerely, Joseph L. Birmingham, Project Manager Generic Issues and Environmental Projects Division of Reactor Program Management Office of Nuclear Reactor Regulation cc: Mr. M. Shoppman, Manager Rockville Licensing Operations Framatome Technologie s, Inc.
1700 Rockville Pike, Suite 525 Rockviile, MD 20852-1631 l
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i D. Howell -2 October 13, 1998
- 4. Since this new evaluation changes a basis for the RPV structural integrity for each plant, provide graphical depictions of the measured Charpy V-notch impact data and the related hyperbolic tangent curve fit to the data. Also, provide the 30 ft-Ib temperatures and upper shelf energy values for unirradiated and irradiated surveillance data.
, Please submit a response to this request within 60 days of receipt of this letter.
Please contact Allen L. Hiser, Jr. at 301-415-1034 or Barry Elliot at 301-415-2709 if fnu have any questions regarding this request.
Sincerely, Original Signed B9:
Joseph L. Birmingham, Project Manager Generic issues and Environmental Projects Division of Reactor Program Management Office of Nuclear Reactor Regulation cc: Mr. M. Shoppman, Manager j Rockville Licensing Operations Framatome Technologies, Inc.
1700 Rockville Pike, Suite 525 Rockville, MD 20852-1631 DISTRIBUTION: liard Cooy E-Mail Central File E. Sullivan - J. Birmingham
/PUBLIC B. Elliot F. Akstulewicz PGEB r/f T. Essig OGC A. Hiser ACRS Document Name: G:\JLBi3AW-2325.LTR Office PGEB/NRR ) M PGEB/M ,
Name JBirmingharI):sw FAhwicz Date 10/ O /98 10/ /3'b8 OFFICIAL OFFICE COPY
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