ML19261F305
| ML19261F305 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/04/1974 |
| From: | METROPOLITAN EDISON CO. |
| To: | |
| Shared Package | |
| ML19261F304 | List: |
| References | |
| NUDOCS 7910250768 | |
| Download: ML19261F305 (1) | |
Text
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E?IClCSURE Metropolitan Ediscn Cc=pany Three Mile Island IIuclear Staticn, Unit 1 (TMI-1)
Decket Iio.50-28c Operating License IIc. OFR-50 IIcnroutine 3C-Eay Environmental Repcrt Th-01 Iatificaticn of an Anc=alcus Measured Level of Radiatica 1.
Descriptica cf Occurrence:
An air particulate sample collected 2500 feet SSE of the Reactor Suilding for the period August 2h-31, ic7h, showed a beta cencentration of 5 2 x 10-13 uCi/=1, which was 9.6 times the beta concentration for the control statien. An i==ediate investigation was begun to determine the source of radienuclides that caused this increase.
2.
Apparent Cause cf Occurrence:
c the following reasons it is believed that the anc=alcus measured level of radiation rader discussion resulted frc= a scurce other than TMI-1.
a.
Analyses indicate that if the neasured radiaticn levels had resulted frc= ther=al neutron fissioning of U-235 atc=s, the fissions vould have had to cecur prior to the date cf initial TMI-l reacter criticality, b.
Analyses also indicate that the measured radiation levels de correspcnd with these that vculd have been expected frc=
the Chinese nuclear be=b detonatien cf June 17, 197L.
c.
Most of the measured beta activity was restricted to one quadrant of the filter paper, which is =cre indicative cf a single stray het particle vice a release frc= TI!!-1.
d.
The high gross beta activity was restricted to only cne sample station, which again is =cre indicative cf a single stray hot particle vice a release frc TMI-1.
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