ML20151C591
| ML20151C591 | |
| Person / Time | |
|---|---|
| Issue date: | 03/31/1988 |
| From: | Peterson C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Tokar M NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| REF-WM-80 NUDOCS 8804130078 | |
| Download: ML20151C591 (3) | |
Text
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MAR 311999 CHP/WM-46 TEST PLAN MEMORANDUM FOR: Michael Tokar, Section Leader Technical Branch Division of low-Level Waste Management and Decommissioning THRU: Richard A. Weller, Section Leader Materials Engineering Section Technical Review Branch Division of High-level Waste Management FROM: Charles H. Peterson, Project Manager Materials Engineering Section Technical Review Branch Division of High-Level Waste Management
SUBJECT:
HITTMAN NUCLEAR SERVICES SUPPLEMENTAL TEST PLAN In accordance with your request, I have reviewed the subject plan which was presented by Hittman at the meetina at the NRC on 28 March 1988. The plan is sufficiently comprehensive that one may reasonably expect the data generated will provide definitive answers on the acceptability of the Hittman waste forms.
However, in the light of previous experience, I recomend that thought be given now to anticipating the results of each test and the effect of those results on your assessment of the Hittman waste forms. Some suggestions are provided in Attachment 1.
If you have any questions, please call me on x20531.
Charles H. Peterson, Project Manager Materials Engineering Section Technical Review Branch Division of Hiah-level Waste Management
Enclosure:
AttarSment 1 l
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8804130078 080331 PDR WASTE WM-80 PDR I IL (. f' N C il I / M M7 /t,@ EO Aff,d/
CHP/WM-46 TEST PLAN COMMENTS ON HITTMAN NUCLEAR SERVICES l SUPPLEMENTAL TEST PLAN Test A. Effect of Waste Loading Previous data suggested that the compressive strengths of Hittman waste forms after 90-day immersion in water decreased monotonically with increase in loading from about A% through B% to C%. The actual values of loading are considered proprietary at this time. At A%, there is an increase in strength; at B, there is no change; and at C, there is a decrease. Also, above 8%
loading, longer cure times prior to imersion resulted in further decrease in compressive strength.
Three possible outcomes for each cure time are: continued decrease with increase in waste loading, a leveling off, or an increase. Indications of the pattern will begin to emerge for the shorter cure times, which will be 97 and 104 days after start of immersion. My expectation is that the monotonic decrease with loading for each cure time will continue. The decrease in strength with loading is not as important as the effect of cure time provided the initial strength is high enough so that the final strength is above 60 psi.
As for the effect of cure time prior to imersion, it is possible that the curve of % change in strength vs % loading for 84 days cure time will lie no lower than that for 28 or 56 days, and may even lie above them. If each longer cure time shows continued c'ecrease in strength, this may oe sufficient reason to reject the Hittman waste foms. In the field, the waste forms will be encased in carbon steel drums. Thus, the waste forms will be protected from environmental waters for one to two years until the drums corrode away. Cure times between 28 days and two years are therefore of interest.
Since two year cure times are not being included in the test plan, the hope is that cure times greater than 28 days will shcw no further decreases in strength and preferably sorte recovery of strength. In either case, the waste forms could be accepted if their strenc+hs were above the 60 psi.
In the event the curves for longer cure times show ever greater decreases in strength above some loading such as B%, then the loading may have to be limited to B%, with due consideration to the variability of the results.
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MAR 311988
~CHP/WM-46 TEST PLAN 2
OFFICIAL CONCURRENCE AND DISTRIBUTION RECORD MEMORANDUM FOR: Michael.Tokar, Section Leader Technical Branch Division of Low-Level Waste Management and Decomissioning FROM: Charles H. Peterson, Project Manager Materials Engineering Section Technical Review Branch Division of High-level Waste Management
SUBJECT:
HITTMAN NUCLEAR SERVICES SUPPLEMENTAL TEST PLAN DATE:
MAR 311983 DISTRIBUTION
. Central ~ File NMSS/RF HLTR/RF REBrowning, HLWM MJBell, HLWM J0 Bunting, HLSE BJYoungblood, HLOB RLBallard, HLTR RAWeller, HLTR CHPeterson, HLTR MRKnapp, LLWM JTGreeves, LLWM JJSurmeier, LLTB MTokar, LLTB JKane, LLTB FACostanzi, RES 1
CONCURRENCES i ORGANIZATION /CONCUREE INITIALS DATE CONCURRED HLTR/CHPeterson hya w 88/8)/3/
HLTR/RAWeller 88/J / 7/
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