ML19323A929
| ML19323A929 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/21/1980 |
| From: | Jay Collins, Conte R, Fasano A NRC - NRC THREE MILE ISLAND TASK FORCE |
| To: | |
| References | |
| PNO-TMI-80-017A, PNO-TMI-80-17A, NUDOCS 8005070324 | |
| Download: ML19323A929 (1) | |
Text
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PREL]MlHARY NOTlflCATION March ?1, 1980 PRELlHINARY NOT)TICATION of L'vCN1 OR UNUSUAL OCCURPLNCE PHO IM1 17A
.This preliminary not if ication constitutes FARLY notice of_ evente.,_of POSS}BLl;j.afety putilic in,t,erest siunit iconce.
The infortnation presented is as initially received, wity verification or evaluation and is basically all that is known h_y NRC staff on this dait
- Tacility: Metropolitan Cdison Company Three Mile Island, Unit 2 Niddletown, Pennsylvania Decket Number 50-320
Subject:
INCRLASLO AUXILIARY Bt!TI. DING ATR PARTICULAIE ACllVITY UPDATF About 3:1b A.M., on March 20, 1980, several local air particulate monitors located in the auxiliary building alarmed.
The highest reading low volume air sempic indicated 1.8 x 10-7 uCi/cc, versus the norvnal reading about 1 x 10-10 uCi/cc.
This sample was take in an area near the "B" Makeup Pump cubicle, where a Makeup System leak was suspected.
Seal injection and letdown was isolated, and reactor coolant system pressure was decrease:
to reduce leakage.
At about 9: 30 A.fi. the airburne activity in the general area in the auxiliary building was restored to normal. Indicating a succesMul isolation ut the suspected leak.
On March 20, 1980, at approximately 7:4? P.M. the letdown system flow was restored and et 7: 56 P.M. seal injection was reinitiated to determine source of leakage.
A local air pargiculate monitor alarmed with resultant airborne activity increasing tu approximately 10~ uCi/cc... The letdnwn syste:n and seal inijection were subsequently isolated again at 8: 50 P.M. without a determination of source of the leakage.
The Makeup System is in recirculation operation.
RCS pressure is bcing maintained by the Standby Pressure Control System.
During'these events the effluent monitors did not indicate a release.
lhe leakage source is still under review by the licensee and NRC.
At the present time, the general auxiliary building airborne levels indicate concentratics_
of 10-Id to 10'd uCi/cc with a maximum concentratic n of 1.9 x 10-8 uti/ct at the Makeup P.r cubicle area.
Media interest occurred because offsite notificet' ion was made by the licensee.
The comonwealth of Pennsylvania was informed.
A press release was made by the licensee but the HRC does not plan one at this time.
This preliminary notification is issued for information only and the int'onnation ir. curren-as of 10:30 A.M.
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Contact:
R. J.
onte 590-3950 asano 590-3950 Collins 590-3965 Prepared by Ext Section..'hief Ext Oc'p'u't'y"DiTec tor Ext
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