ML20064G930

/03L-0 on 781109:Reactor Vessel Chemistry Exceeded Tech Spec Limits for Conductivity & Concentration Due to Presence of Organic Compounds in Condensate Sys.Organic Filtration & High Concentration of Ion Resin Cleanup Begun

ML20064G930
Person / Time
Site:	Brunswick
Issue date:	12/11/1978
From:	CAROLINA POWER & LIGHT CO.
To:
Shared Package
ML20064G928	List: ML20064G923 ML20064G930
References
LER-78-086-03L, LER-78-86-3L, NUDOCS 7812140160
Download: ML20064G930 (3)

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EPORT 0 ATE EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h lo l2l l Unit No. 1 and No. 2 reactor vessel chemistry exceeded the Technical Specification [

i o ,3 ; l limits for conductivity and chloride concentration. (Technical Specification 3.4.4) l l o 14 l lThis report outlines the sequence of events during periods of abnormal reactor vessel l l o i s l Iconductivity. A description of the evolutions taken to con' trol conductivity during theg To is 1 l periods, and corrective actions caken to prevent recurrence are included. (See l I'o'TT1 lattached) . [

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Unit No. 1 Conductivity

• cxceeded 10psho's/cm from 0830 to 1100 on November 11, i 1978, reaching a maximum value of 13.8 peho's/cm. During this same period of high conductivity, 24 consecutive hours above ( sho's/cm was experienced. The period began on November 10, 1978 (1525), and ended on November 11, 1978 (1930).

Sequences of Events:

11/10/78 1525 Conductivity 2 pmho's/cm and increasing 11/11/78 0445 Conductivity 3pmho's/cm, reactor power reduced to 50% for conductivity control 0700 Moisture separator reheater crud burst 0850 Began reactor shutdown 0930 Conductivity peaked at 13.8 pmho's/cm 1100 Conductivity less than 10p mho's/cm 1130 Generator separated from grid.

2000 Conductivity 2 mho's/cm g and decreasing On November 27, 1978, conductivity exceeded 10 gmho's/cm and peaked at 10.95gsho's/cm.

11/27/78 1615 Conductivity 2 pmho's/cm and increasing 1710 R'JCU pump B put into service immediately af ter maintenance l completed l 1800 Conductivity peaked at 10.95 mho's/cm a

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0915 Conductivity Q2mho's and decreasing l Unit No. 2 l

Conductivity was above 2u mho's/cm for a period of more than 241 l consecutive hours on November 9,1978, and November 11, 1978. The first i period began on November 8, 1978 (1700), and ended on November 9, 1978 l (2300), while the second period began on November 10, 1978 (1315), and l lasted until Nove=ber 12, 1978 (0030). At approximately this same time, the Chloride concentration exceeded 0.2 ppm.

• Conductiviy refera to reactor vessel conductivity

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Initially no-one source could be singled out for causing the high reactor conductivity or chloride concentration events. Excessive suspended solids possibly originating in the heater drains system, resin released from the RWCU system or Radwaste, chlorides entering the condenser via tube-to-cube sheet leaks, or a combination of the above were suspected causes for the chemistry problems.

Several corrective actions were taken in an effort to control reactor chemistry. They are as follows:

(1) Major power reductions allowing reduced feedwater flow to the reactor vessel, decreasing vessel conductivity.

(2) RWCU discharge diverted to the condenser hotwell for additional demineralization.

(3) Heater drain forward pumping was stopped to help control suspended solids.

(4) Racwaste demineralizers were frequently monitored'for resin releases.

(5) An extensive sampling and analysis program was implemented utilizing plant and corporate laboratories and personnel and consultants.

(6) Condenser water boxes suspected to have leaking tubes were removed from service and leaks checked.

q Limited success was achieved with the above corrective actions,

} but conductivity was still higher than nor=al.

The services of a leading authority on reactor water chemistry were contracted to undertake further research and identify the problem. An .

organic agent, not readily detectable or filterable with current plant equipment and techniques, was found in the CST's (Condensate Storage Tanks).  !

The organic agent was identified.as BH-38, a detergent used for decontamination. Further use of this detergent has been prohibited within the plant. A temporary series of demineralizers using double anion resin and carbon filters was set up to remove the detergent from Radwaste and the CST's. Both CST's were recirculated through the carbon filters and mixed bed demineralizers to remove organic and ionic contaminants.

Actions to Prevent Recurrence (1) Banning the use of BH-38 in the plant.

(2) Tests for detergent have been developed to determine the quality of processed water before it is transferred to or from the CST's.

(3) The use of double anion resin in the RWCU de=ineralizers.

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