ML19310A320
| ML19310A320 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/04/1980 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| References | |
| NUDOCS 8006110082 | |
| Download: ML19310A320 (2) | |
Text
_.__
i PEILADELPEIA : ELECTRIC CGEPAET i auch 1kython Atomie Povee Station Delta, Pennsylvania 17314 l
Jtune %,1980 1
Mr. Bayee E. Grier Office of Inspection and Ektforcement Regica 1 1de i Ccumissica United States Buelear
- g:
c 631 Park Avesne Eing of Prussia, PA 19406 afN: REPORtAFT OCwe=W - PROMPT NOTIFICATION
)
Confirming R. S. Fleischmann's ccaversation with Mr. Greenman, Regica 1, United States Buelear Begulatory hiasion on 6/3/80.
1
Reference:
Docket No. 50-2TT Peach Botton Unit 2 T=eh=4emi Specification
Reference:
3.8.B
%. A-t No. 2-80-10/IP Occurrence Date:
3/30 thru h/7, and h/17 thru h/22, 1980 Identification Date:
6/3/80 Id-atification of Occurrence:
Utr h==-d release of radioactive water to circulating water systen.
c Conditicos Prior to Ch-.ae:
Unit 2 shutdoen during refa=14=c outage.
A&=esst Cause of the Gww. ace:
Flooding of the Mrmal condenser s't.ess space during refueling outage permitted radioactive water to leak through a defective och tube i
to the circa1=*ing water system.
1 3--1vsis of Cr.. m :
On June 3, a routine survey was'made of the Al water box on Unit 2 in preparation for a1--
4=
of the condenser. This survey identified samarable costa =4am*4cm levels.
An investiention was initiated which M ded the folloeing information.
PrioP te shutdous of Unit 2 for its 1980 mf==14ngr outage, the Al water gh D
bas on this unit was valved out and vented on March 13 as a result of 9
es observed incrosse in the conductivity of the condensate system. This
\\
~j il 8 006116 dF2
-2 action halted the increase in the ocedactivity of the c=d====**.
Vesting of the water box showed no discernable increase in off-gas flow.
The unit continued to operate with this water box out of service until the shutdown for the refueling outage on March 21, 1540. During this time interval, eaad===er vectaza was maintained.
This prevented any leakage to h cire='=+4== vater system during this time interval.
l pollowing shutdown, ccedoneer vacuum was broken and level in the cond====r in:reased as a result of normal plant inventory manipula-tions associated with the refueling outase.
Water level in the hotwell was above the lowest condenser tubes in the water box from Marc 30 th. 4 April 7 and April 17 through April 22, 1980.
It is belinved that during this time interval, same small leakage o{ water from the hotwell through a 1--64=
tube occurred.
This waterg van diluted hr the cireulating water flow of at least 250.000==11=e per minute during this entire time period.
E77 =a taken at the plant d4=aha go canal indicated be.ek 4 activity letala during this tian interval.
Based on no observable activity in the diluted semple, the very small leak me indicated hr no discernable ekaa== in off-gas flow when h water box was vented, and the low differential pressure (lese them 10 feet of water), the leak rate is
)
believed to have been =4=4 - 1 did not exceed MPC limite.
Di=ah= w levels of radioactivity j
Co.. wi.1ve Action:
i Since a=d====r level has been below the lowest tu W e in the e-d===*=
since April 22, no additional leakage is possible.
Calculm+4ana are being performed in order to try and estimate the total volume and activity released during this. event.
The leaking tube will be identified and plugged prior to startup.
Prwetous yanures:
Bone stattar.
I
$Y!= Y
- v. 2. u n ri.h statian Superin+=ad==t WTUtlja s
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