ML20041C172
| ML20041C172 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/19/1982 |
| From: | Barrett L, Fasano A, Shanbaky M Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| PNO-TMI-82-003, PNO-TMI-82-3, NUDOCS 8202260300 | |
| Download: ML20041C172 (1) | |
Text
50320-821904 February 19, 1982 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-TMI 82-03
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This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance.
The information is as initially received without verifi-cation or evaluation and is basically all that.is known by NRC staff on this date.
Facility: Metropolitan Edison" Company Licensee Emergency ~ Classification: 1 Three Mile Island, Unit 2 X Unusual Event Docket No. 50-320
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Subject:
OXYGEN DEFICIENT ATMOSPHERE IN THE REACTOR BUILDING
.. Prior to a scheduleIpersonnel entry into the Unit 2 fsactor building, at about 9:00 a.m.
the reactor building purge was activated and air oxygen concentration was measured at 17% (normal 02 concentration'is about 20.5 - 21%).
This 02 deficient atmosphere was verified using another 02 meter within about 30 minutes from the original measurements.
To investigate the cause of this 02 deficient atmosphere, a second team entered the reactor' building to perfonn additional air sampling and visual observation.
The team was equipped with explosive gas and 0 detection instruments.
Variable 02 concentrations 2
were noted on the 305' level with the lowest level at 12% 0.
The detection equipment 2
also ~ indicated an explosive mixture at the 347' level.
At that time, the team was ordered to immediately exit the building.
A grab air sample from the 305' level was analyzed and indicated 1-1.5% H2 with no detectable Cop and CO and 19% 0.
At 5:25 p.m.
2 the licensee declared an unusual event.
The on-site NRC staff continues to monitor the licensee's investigations of the possible causes of the 02 deficient atmosphere in the reactor building.
Media-interest has occurred because of' public sensitivity to TMI related events and the licensee issued a press release.
The NRC also plans to issue a press release.
The' Commonwgalth f Pennsylvania has been no fied.
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