ML19256A748
| ML19256A748 | |
| Person / Time | |
|---|---|
| Issue date: | 10/23/1978 |
| From: | Albrecht P NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Whitman G OAK RIDGE NATIONAL LABORATORY |
| References | |
| NUDOCS 7901100027 | |
| Download: ML19256A748 (4) | |
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NUCLEAR REGULATORY COMMISSION
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OCT 2 01978 4
Those on Attached List Gentlemen:
Sutject: J-R Curve Methodology and Testing of Irradiated Specimer.s; Meeting of NRC Contractors Summarized below are the main decisions made at the September 28-29, 1978.
meeting held in Annapolis, Maryland.
Attendants hRC: Serpan and Albrecht HEDL: Williams and Carlson ORNL: Whitman and Merkle NRL: Loss and Menke NSRDC/ Naval Academy: Gudas and Joyce Univ. of Md.:
Irwin Wash. Univ.: Paris W R&D: Wessel, Landes and Clarke J-R Curve Methodeloqy Interim recommendations for test measurement parameters, 29 September 1978.
1.
Face groove the irradiated specimens by 10 percent (5 percent on eitherside). Machine face grooves down the center of the specimen.
Use standard Charpy-V notch cut.
2.
Use the plane-stress compliance expressions listed in:
Saxena, A. and Hudak, S. J. Jr., " Review and Extension of Compliance Information for Common Crack Growth Specimens," Westinghouse Scientific Paper 77-9E7-AFCGR-P1, May 1977 3.
To determine aa, use nine evenly spaced measurement points from one side of the specimen to the other across the crack front.
The average crack extension should be calculated by using the average of the two surface measurements 'plus the seven intermediate measurements.
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' OCT 2 31978 Those on Attached List 4.
Use the net specimen width, Bmin, computing J.
5.
Use the maximum specimen width, Bmax, for computing the crack extension, aa.
6.
Limit the maximum crack extension for J-R curve measurements to 10 percent of the specimen width.
7.
Use the "Merkle-Corten" correction for computing J, as given by:
Merkel, J. G. and Corten, H. T., "A J-Integral Analysis for the Compact Specimen Considering Axial Force as well as Bending Effects," Transactions, ASME, November 1974, pp. 286-292.
Some of the above rules were made simply to permit direct comparison of data from various sources.
Test Matrix A 533-B; HSST-02; 550'F; a/W'O.5, 0.6, C.7 and 0.8; 0%,10% and 20% face grooves; four replicates in all but two cells.
8.
NSE has already tested two replicate specimens in each cell of t6e matrix.
9.
HEDL will test one specimen in each cell.
- 10. W R&D will test the remaining 10 Lpecimens; fabricate and test two additional specimt ns to complete matrix if W deems necessary.
ASTM Round Robin
- 11. Assume that one cell only will be tested with a/W=0.6 and, for the time being, no face grooves.
12.
If a moderate amount of face grooving is found to be desirable, these grooves will b: added before the specimens are shipped to the participants.
- 13. Add NRL and Washington University to the list of participants.
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Those on Attached List OCT 2 31978 Actions
- 14. ORNL Make the preparatory arrangements for face grooving the irradiated specimens.
Plan a pilot experimental work for irradiated and face-grooved 0.5T specimens; include some specimens without face grooves.
Plan, in cooperation with NRC, the experiment design for the fourth irradiation.
- 15. HEDL Bring measurement points from both LVDT and clip gage signals in closer agreement.
Test the 12 matrix specimens.
Test specimens, as needed, to verify that J-R curves can be measured for 0.5T compact specimens.
- 16. W R&D Test the remaining 10 matrix specimens.
Test two 1.6T compact specimens and compare the results with HEDL's.
- 17. NSRDC Recalculate the data from matrix specimens in accordance with the above rules.
Next Meeting Since the September 29 meeti_ng, and in consideration of NRC needs, we have decided to hold the next contractors' meeting during the week of December 4, 1978. We are also planning to convene the Vessel Integrity Review Group on the day after the upcoming contractors meeting.
Sincerely, j?2dw helotuCf Pedro Albrecht Metallurgy & Materials Research Branch Division of Reactor Safety Research
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ADDRESSEES - LETTER DATED OCT 2 31978 G. D. Whitman, ORNL J. G. Merkle ORNL F. J. Loss, NRL B. H. Menke, NRL J. P. Gudas, NSRDC J. A. Joyce, NSRDC G. R. Irwin, UMD P. C. Paris, Wash. Univ.
E. T. Wessel, W J. Landes, W -
G. Clarke, 7 J. A. Williams, HEDL K. W. Carlson, HEDL W. S. Hazelton, NRC R. M. Gamble, NRC C. Z. Serpan, NRC