ML20198G109
| ML20198G109 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 01/12/1976 |
| From: | Hosler A WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Organ C, John Thomas, Trapp O WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| Shared Package | |
| ML20198G095 | List: |
| References | |
| CON-WNP-1107 NUDOCS 8605290240 | |
| Download: ML20198G109 (3) | |
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WASHINCTON PUDUC POWEa Sum.y SrsTru January 12, 1976 Distr 2mnon: JP Thomas CB Organ RE Dellon OE Trapp .
Distribution .
JE Woolsey . AG Hosler;.(2) 3 TJ Houchins VB Mody A. G. Hosler . JL Kemp 'CE Love Ov/ i.it.n 1: MEETIftG MIflVTES - REVIEW OF WNP-1/4 SOIL Eng. Files (4) ER Rybarski DEflSITY TESTIfiG - JA;iUARY 10, 1976 NO Strand RA Chitwood WD Bainard DH Walker Attendees: J. P. Thomas T. J. Houchins C. B. Organ C. E. Love . .
O. E. Trapp E. R. Rybarski
, ., A. G. Hosler N. O. Strand Mr. Renberger opened the meeting by stating that the purpose of the -
meeting was to review the status of the WNP-l/4 soil density testing and then determine if we had a 10CFR50.55(e) incident.
Mr. Organ' then presented the following summary of the' activities concerning soil testing to date: ,
ASTM-02049 requires that the sample table be capable of vibration at 60 Hz over a range of 0.002 to 0.025 inches mean-to-peak (m-p), and that '
the maximum density be determined at the maximum amplitude.
In Appendix 2P of the PSAR (Pg. 2P D-7), it is stated that the maximum and minimum density testing for the Site investigations, and the development of the compaction control were done in accordance with ASTM-D2049-69.
. The Shannon & Wilson (S&W) vibrating table, a Syntron model VP-86-B1, has been recently calibrated for a maximum mean-to-peak amplitude of about .005' inches. Therefore, the information presented in the PSAR was
. not developed in accordance with 02049 in regards to the amplitude range .
for vibration.
Pacific Testing Laboratory (PTL) initially purchased a Syntron model VP-l 85-B1 which was calibrated and then certified by Boecon to satisfy j D2049. Boecon later withdrew the certification when they realized it
! didn't satisfy D2049 in regards to the amplitude of vibration. This L table provided maximum densities about 8 lbs/ft3 lower than that obtained .
i by S&W. S&W determined (by accelerometers) that the table's maximum l amplitude with a 250 lb. load was 0.0019 inches m-p. This' low amplitude explained the inability to obtain correlation between the S&W data
. (i.e., the PSAR data) and the PTL data; that is, the 8 lbs/ft3 difference.
- PTL than purchased a Syntron VP-181-Al which the catalog information i said complied with D2049 and woud-provide an amplitude range of 0.002 to r 0.025 inches m-p. When tested by S&W with accelerometers, however. this machine could only provide about 0.004 m-p with a 250 lb. load. At this .
l time all Class A backfill activities were placed on "hol'd" (approximately 12/S/75). .
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Distribution . January 12, 1976 UE&C then called the Chairman of the ASTM Committee responsible for 02049, Al Hussaini, (UEAC telecon 1590). He stated that he was aware of.
the problems with 02049 and th'at it is planned to revise the standard to.
specify an amplitude of 0.015 inches, probably p-p. In other calls, UE&C learned that the Bureau of Reclamation uses .0075 and the Corps of Engineers uses 0.015 inches, both m-p. .
Af ter the failure to have the new PTL machine satisfy D2049, soil samples were sent to the University of California, Berkeley, for tests on a Syntron VP-200 and a Material Testing System table. The VP-200 machine has a vibration range up to 0.025 m-p (i.e. , satisfies D2049 in this
. regard). The results of these studies showed a maximum density essentially independent of amplitude for a range of .007 to 0.015 m-p (S&W indicated 0.003 to 0.016 inches). Above and below these values the densities decreased. A slight variation in densities (about i lb/ft3 was measured which is normal. The PSAR admits to aMut a 2 lb/ft variation '
(Pg. 2P D-4).
With these results, it was decided to adjust.the PTL machine to run between 0.007 and 0.015 inches. Production runs would then be run at the amplitude determined by the Berkeley test to give the maximum density. '
On the evening of January 9,1976, Soil Testing Company attempted to modify the PTL Syntron VP-181-A to provide a maximum amplitude of 0.015 inches. However, the maximum obtainable amplitude obtained was determined optically as 0.0055 inches. It was then decided to restore.the machine to its original condition and have Soil Testing Company calibrate and certify the machine for the maximum amplitude obtainable in this condition (probably about .0044 m-p). -
- Mr. Organ then suggested the following plan:
Release the " hold" on Class A backfill activities on 1/12/76 and .run production tests on the certified PTL table. Control the processes by NRC to prevent concrete' being placed in Class A backfill areas.
t Obtain a production test machine with a minimum variable range from .007 inches to .015 inches (m-p). Take sieve samples and determine the density-amplitude curves for each gradation. Determine the setting for i the maximum density and run the production tests at this amplitude. The density-amplitude curve would be rechecked every two weeks. If any samples fell outside the gradation range, a s'pecial density-amplitude curve would be run. For past tests, run at 0.0044 inches, we would correlate with new samples.
Should the efforts to purchase a new machine of acceptable range prove )
futile, then an identical approach would be used except that families of curves for significant gradations would be run at Berkeley and data run at the 0.0044 inch amplitude would be correlated to the Berkeley data.
Production tests would continue to be run on the present VP-181-Al at . i maximum amplitude. Correlation control would be by periodic calibration of the PTL VP-181-Al combir.ed with periodic reverification of the Berkeley
)
curves.
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January 12, 1976
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It was also decided that Region V should be informed of the problem that day, if possible (this was dore). However, it was agreed that this was '
not a reportable deficiency under 10CFP50.55(e) since at this time yie have no evidence that material of inadequate density has been placed.
It was also decided that NCR control over the activities would continue and that no mud cats would be placed over the recompacted areas until the problem is resolved.
Mr. 0rgan made the following concluding statements: '
- 1) We are making six recompaction passes for each 8 inch lift and all ,
evidence indicates that the soil is reaching its maximum compactness
.after only 2 passes.
- 2) Data to date shows that we are within 1 to 2 pounds of the maximum .
density.
- 3) Everyone contacted is running tests at amplitudes less than .025 inches and we have found no one that complies with D2049 in this regard.
- 4) We have no reasco to believe we have any soil recompacted to less than 97% relative compaction but to prove this we will require additional testing on other machinos.
AGH:km '
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