ML19276D927
| ML19276D927 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 01/08/1979 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7901220098 | |
| Download: ML19276D927 (2) | |
Text
'rsee
--=**m***
a n
PHILADtiLPHIA ELECTRIC COMPA.W Peach Bottom Atomic Power Station Delta, Pennsylvania 17314 January 8, 1979 Mr. Boyce H. Grier Office of Inspection and Enforcement Region i United Statas Nuclear Regulatory Commission 631 Park Avenue K.ing of Prussia. PA 19406
SUBJECT:
REPORTABLE OCCURRENCE - PROMPT NOTIFICATION Confirming C. E. Andersen's conversation with Mr. Greenaan. Region I, United States Nuclear Regulatory Commission on 1/8/79.
Reference:
Docket No. 050-277/78 Peach Sotton Units 2 and 3 Technical Specification
Reference:
3.8.C.1 Report No. 3-79-2/IP occurrence Date:
1/8/79 Identification of Occurrence:
Ga.cous celease rate exceeded allowable Technical Specification limits for instantaneous release rate.
Conditions Prior to Occurrence:
Unit 3 shutdown.
Apparent Cause of Occurrence:
Failure to maintain reactor coolant temperature low enough to prevent vaporization while maintenance of isolation valves was in progress.
Ana l ys is o f Occurr==~ :
Unit 3 was shutdown for a maintenance outage and shutdown cooling was used periodically to maintain reactor coolant at an acceptable tevel. At the time of the oscurrence, shutdown cooling had been off for about II: honars.
During that time, the coolant t empe ratures rose to about 200 F.
At the same time, the RCIC 0
steam isolation valves were both being maintained.
part ially open and the outer valve iMO-13-16) was dismantled.The immer valve (N0-13-15) was This provided a leak path for reactor coolant vapors to the MSIV room and then to the Unit 3 vent stack.
The duration of the release was 15 hour1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> > and the peak levels were 270% of Technical specifications on an instantaneous basis. Air sampics were takr THIS DOCUMENT CONTAiMS 7901220073 POOR QUALITY PAGES J
J
I e
?
l Two operators entered the room for approximately 20 minutes during this period to perform valve operations. An HP entered before the event to start an air sample and after the event to collect His total time in the area was approaimately 15 minutes.the air sagte filter.
All three people were wearing raspiratory prvtection and will be body counted to check the possibility of uptake.
We safety significance of this event is minimal.
Corrective Action:
Upon discovery of this condition, shutdown cooling was placed back in service.
The reactor water cooled down and the release was terminated.
Previous occurrences:
3-78-19/IP Very truly yours, W. T. Ullrich, Superintendent Peach Botton Atomic Power Star ion WTU/CEA:lla
-