05000325/LER-1979-006-03, /03L-0 on 790316:during Refueling Outage,Condenser Tube Leaks Allowed Chlorides to Enter Condensate Sys.Cfd in Svc Became Depleted Due to Entrained Oxygen.Condenser Vacuum Broken & Cfds & Cdds Placed in Svc to Clean Sys

/03L-0 on 790316:during Refueling Outage,Condenser Tube Leaks Allowed Chlorides to Enter Condensate Sys.Cfd in Svc Became Depleted Due to Entrained Oxygen.Condenser Vacuum Broken & Cfds & Cdds Placed in Svc to Clean Sys

ML19263E006
Person / Time
Site:	Brunswick
Issue date:	04/17/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19263E004	List: 05000325/LER-1979-006, Forwards LER 79-006/03L-0 05000325/LER-1979-006-03, /03L-0 on 790316:during Refueling Outage,Condenser Tube Leaks Allowed Chlorides to Enter Condensate Sys.Cfd in Svc Became Depleted Due to Entrained Oxygen.Condenser Vacuum Broken & Cfds & Cdds Placed in Svc to Clean Sys
References
GD-79-1007, LER-79-006-03L, LER-79-6-3L, NUDOCS 7904240323
Download: ML19263E006 (2)

LER-1979-006, /03L-0 on 790316:during Refueling Outage,Condenser Tube Leaks Allowed Chlorides to Enter Condensate Sys.Cfd in Svc Became Depleted Due to Entrained Oxygen.Condenser Vacuum Broken & Cfds & Cdds Placed in Svc to Clean Sys

Event date:
Report date:
3251979006R03 - NRC Website

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2 l While leak-checkinn the tube sheet s on the_naln_Londemer durine a refun l i Tm oor ve I

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.3 l chloride concentration in the vessel exceeded 0.12 ppm on 3/16/79 and again on 3/29/79].

l The condensate system was running, and the condenser weis under a vacuna.

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,, j i time vessel chloride concentration exceeded 0.2 ppm was 33 hours3.819444e-4 days <br />0.00917 hours <br />5.456349e-5 weeks <br />1.25565e-5 months <br /> on 3/16/79 and 41 l

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CAU5E DESCRIPTION AND COnRECTIVF AC NO'. :

l On 3/16/ 79, condenser tube leaks allowed chlorides to enter the condenuate ssot 1

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LER CONTINUNfl0N -- R0it 1-79-o Facility' BSEP Unit el Event Date 3/16/79 nsed for hotwell level control. Chlorides were admitted to the vessel by the continuous feed of the CRD system. 1he RWCU system was under clearance to install a piping modi fic ation and thus was not available for chloride removal.

Condenser vacuum was broken, and CDD's and additional CFD's were placed on service to clean up the condensate system.

Condensate was circulated through the reactor vessel using the feedwater systcm for supply and the reactor cavity drain to the hotwell for return. A precaution has been added to 0.P 32.1 and 32.2 to maintain at least one (1) CFD and one (1) CDD on service with an effluent conductivity <0.8 mho/cm whenever condenser vacuum 27 in.

lig.

On 3/29/79, condenser tube leak, allowed chlorides to enter the condensate system with the CFD'-

and CDD's bypassed.

They were intentionally bypassed in order to determine if condenser tube leaks were present.

Chlorides entered the CST through the reject bypass valve, being used for hotwell level control. Chlorides were admitted to the vessel by the continuous feed of the CRD system and were not detected in time to prevent exceeding the Technical Specification limit of 0.2 ppm. The RWCU system was under clea rance for a piping modification and was not available for cleanup. Condenser vacuum was broken and CFD'-

and CDD's were placed on service to clean up the condensate system. The continuous feed of the CRD system and draining through the RHR system for level control were used to clean up the reactor vessel.

In order to prevent a recurrence of thi: type, a Special Test Procedure (79-23) was written and approved.

This procedure provides additional precautions and increased CST and reactor water sampling frequencies when CFD's and CDD's are bypassed while checking th: hotwells for chloride intrusion.