ML20114E198
| ML20114E198 | |
| Person / Time | |
|---|---|
| Issue date: | 04/16/2020 |
| From: | Jordan Hoellman NRC/NRR/DANU/UARP |
| To: | |
| Jordan Hoellman, NRR/DANU/UARP, 415-5481 | |
| Shared Package | |
| ML20114E116 | List: |
| References | |
| Download: ML20114E198 (1) | |
Text
Summary of Changes to TRISO Topical Report Resulting from the Extent of Conditions Review April 15, 2000 Extent of conditions review In late 2019 an error was noted in Table 5-5 of the topical report. The reported SiC mean density confidence extremum (3.204 g/cm3) should in fact be 3.196 g/cm3. This was the result of a transcription error during editing when a more complex table from an earlier draft was reduced to the more simplified table that appears in the final report. As a result of finding this error, INL conducted an extent of condition review of the entire report, to determine if any other errors exist in the data presented. The following additional issues were identified. The proposed change to the report is described for each item below.
Corrections to the topical report
- 1. Table 5-3: Value for IPyC BAF0 (1.025) is incorrect. Appears to have been copied in error from the correct value of 1.0225, which would be rounded to 1.023 to be consistent with significant figures in Table 5-3.
- 2. Table 6-4: The time-average minimum temperature for AGR-2 Capsule 5 (923C) is incorrect. It should be 901C. The table was copied correctly from the as-run report (INL/EXT-14-32277), so the error originated in the as-run report, and not with the topical report. Value should be corrected in the table.
- 3. Table 6-5. Table 6-2 should be changed to Table 6-4 in the footnote. This is most likely a result of edits to the report that were not applied to the footnote.
Additional enhancement arising from the review
- 4. Table 5-2. The value for AGR-1 kernel density should be changed from 10.66 g/cm3 to 10.92 g/cm3 and the value for AGR-1 kernel aspect ratio should be changed from 1.015 g/cm3 to 1.021 g/cm3. The original values are not in error. However, they come from the BWXT characterization reports of the kernels, while the replacement values come from the ORNL characterization reports. The ORNL values were reported in the AGR-1 As-run Report, and will be used in the topical report for consistency. In addition, the ORNL value for kernel density was based on a much larger sample size and was used to determine other compact properties not provided in the topical report (including uranium loading), and therefore using the ORNL value may avoid confusion in the future.
These corrections and enhancement do not affect other areas of the report nor alter the conclusions.