ML19221A325
| ML19221A325 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/28/1979 |
| From: | Galen Smith NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| NUDOCS 7905210282 | |
| Download: ML19221A325 (2) | |
Text
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4/28/79 C. Smith
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.c Prior to the TMI accident of March 28, 1979, Unit 2 had only operatedr s _
for about 90 days.
This new unit had not built up significant levels of radioactivity within the systems and consequently the plant was very " clean"Q Although access, to_the_ Auxiliary and Fuel Handling Building was controlled for radiological _ con _ditions; the general surface areas were not contaminated and the radiatian areas along the corridors were very low, generally less than 1 mr/hr, and there was generally no airborne activity.
Since the time of the accident, stringent radiological controls have been imposed for entries into the Auxiliary and Fuel Handling Building and
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%. no access has been permitted into the Containment Building.
Only slight increases in radiation levels have occurred in the Turbine Building due to operational changes. General area radiation levels in the Turbine Building are 0.1 mr/hr, with occassional airborne activity which is mostly less than 10 to 20% of maximum permissible concentrations (MPC) for cccupational workers.
The radiological changes within the Auxiliary and Fuel Handling Building have been dram $ tic.
There is wide spread contamination with its levels
._. currently measuring in the several R/hr range.
For example, the e=ergen$cy diesel generator area has surface contamination measuring 3 to 5 R/hr.
The direct radiatien levels from tanks and components has also increased greatly.
Corridors generally measure from 50 mr/hr to 1.5 R/hr (1500 mr/hr) at this time, while readings at the doorway of some cubicles.are greater than 1000 R/hr.
A specific example of the change is the makeup valve gallery which is on the 305 ft. elevation of the fuel handling building.
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7905210281 159 139
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7 Before the accident, the radiation level at the doorway was a few mr/hr. About 1 day after the accident the level was 750 R/hr, about.
200 R/hr on April 10, and 60 R/hr on April 23.
Airborne activity currently r.
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runs in the rm.ge of 10 to 10 Ci/cc of iodine-131 in the corridors with levels of 10 Ci/cc iodine-131 in specific rooms and
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