ML19308B580
| ML19308B580 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/10/1979 |
| From: | Jackson L NRC - TMI-2 OPERATIONS/SUPPORT TASK FORCE |
| To: | Jay Collins NRC - TMI-2 OPERATIONS/SUPPORT TASK FORCE |
| References | |
| NUDOCS 8001150248 | |
| Download: ML19308B580 (8) | |
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December 10, 1979 MaiORANDUM FOR: John T. Collins, Deputy Director, TMI Support THRU:
D. ?! eely, Senior Radiation Specialist TMI Support FROM:
L. L. Jackson, Shift Radiation Specialist, TMI Support
SUBJECT:
POTENTIAL RADIOLOGICAL CONDITIONS AFFECTIf4G RE-ENTRY INTO UNIT 2 CONTAINMENT I have reviewed the informatica we have on file regarding dose rates and activity levels inside the Unit 2 containment and discussed some of this information with Ed Walker of Bechtel.
Dose rates have been measured for very small areas inside the containme1t.
Calculations have been cade to estimate dose rates in other areas. Cal;ula-tions were based on information obtained from primary coolant samples, suop samples, containment air samples and some were based on gama spectrosepyy results. I proposed that the error bars might be large on some of the calculations and Ed Walker, Bechtel HP, agreed that some of the calculations were rough.
Froa my review, I have concluded that general area dose rates inside the personnel hatch on the 305' elev are in the ragge of 2--40R/hr gama and probably 350 - 400 rad /hr B. This seems to be in agreement with the assumption d
in the "TMI-Unit 2 Reactor Building Initial Entry Reconnaissance Program that the dose rate for gama just inside tihehatch will be 36 R/hr.
If this is the dose rate, a perscn would receive 3 rem in 6 minutes and 5 rem in 3 minutes.
It appears to me that the dose rate would not be expected to excedd the value of 36 t/hr (whole body) thus giving a person ample time to determine the true conditions without being overexposed.
I don't tnink one can generalise safely about dose rates in different areas and at different elevations. The best plan of attack will.be to map these areas on reconnaissance type sureeys. Once an initial entry has been made and some reliable data collected on plateout, doserates froa equipment, etc., (on 305' elev.) then the conditions in other areas can be predicted with more certainity.
We should be aware that certain equipment inside and near the airlocks may be hotspots. How hot we don't know, but I have attached some estimates made by Ed Walker and they tend to support the possibility that general area dose rates may be as high as 40 R/hr.
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.e John T. Collins There are some shafts which allow radiation from the sump water to peretrate all of the elev nions. Shielding over the sump water varies % eHvation to elevation causing radiation levels to vary. The radiation levels from certain equipment are unknown (Exa. Accumulators, Core Flood Tanks and piping may behhot if the check valves leaked). Plateout may be worse at the lower i
elevations, since the loca was through the RCOT. There are a lot of uhknowns.
The sumary seems to be that we should be able to make a reconnaissance entry, staying near the air lock, gather some valuable data, and come out until the data is elavated.
One thing that I learned while writing this is that1.dJfbckwas involved in putting some TLD's inside workers shoes and gloves recentTy and he found the Bf ratic stayed the same even though the TLD's were inside heavy boots and gloves (multiple layers). I would like to know if the B-is really 8 or some low energy electromagnetic radiation ( or Bremsstrahlung).
The attached drawings show some of the predictions by Walker of Bechtel.
In his words, "If they are within a factor of 2, it would be fantastic."
L. L. Jackson Shift Radiation Specialist TMI Support Attachment? As Stated cc:
R. Vollmer M. Greenberg J. Lee DISTRIBUTION:
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