ML19310A320

RO 2-80-10/1P:on 800330-0407 & 17-22,radioactive Water Was Released to Circulating Water Sys.Caused by Flooding of Normal Condenser Steam Space Permitting Radioactive Water to Leak Through Defective Condenser Tube to Water Sys

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

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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 United States Buelear

• g: 1de ci Ccumissica 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:

Utrch==-d release of radioactive water to circulating water systen.

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 gh9 D bas on this unit was valved out and vented on March 13 as a result of \

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.

l This time this prevented interval.any leakage to h cire='=+4== vater system during

! 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 30 th. 4 was Aprilabove 7 and the Aprillowest 17 through condenser April 22, tubes1980.in the water box from Marc

, It is belinved that during from the hotwell this atime through 1--64= interval, same small leakage o{ water van diluted tube occurred. This waterg 1

hr the cireulating water flow of at least ,

250.000 ==11=e per minute during this entire time period. E77 =a taken duringat thetian this plant d4=aha go canal indicated be.ek 4 activity letala interval.

l Based on no observable activity in the 1 diluted ekaa== semple, the very small leak me indicated hr no discernable ,

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 since a=d====r April 22, no level has beenleakage additional below the is lowest possible. tu W e in the e- d= ==*=

Calculm+4ana are being activityperformed released in orderthis.

during to tryevent. and estimate the total volume and and plugged prior to startup. The leaking tube will be identified Prwetous yanures: -- -

Bone stattar.

I

$Y!= Y

v. 2. u n ri.h statian Superin+=ad==t WTUtlja s

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