ML19345B974

RO 50-260/80-47:on 801107,chlorine Residual Reached 0.49 mg/1 Exceeding Max Allowable of 0.05 mg/1.Caused by Failure of Main Condenser Cooling Water Pumps to Provide Adequate Dilution.Chlorination Stopped.Procedures Revised

ML19345B974
Person / Time
Site:	Browns Ferry
Issue date:	11/26/1980
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
BFRO-50-260-804, NUDOCS 8012030599
Download: ML19345B974 (4)

Text

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b TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street mr II November 25, 1980 W. Jaees F. C"Tilly, Pirector re.e. tw:lenr 24 utarc- c r Hsien re<nen II - 9?i 3100 101 5Mr.'etta Str t, sty

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• nvf rmntil *ach*!. cal scacific3ticrs and ' uglernts retr r' mort b'r talmr to ~2 m W=r.rr 10,1.MO, fran H. L. 71:ercrorbie, Pcwer Plant ?umrinterx!ert, Frewns Farry Ntclear Plant. ~his report provides ntSilr cencerniac t a vio! stien cf envi .?T,99 tai t**# nic?' r W I'--ticn coct h- 1.::.'1 by a' '.Mrq raxi:'ua cYo-irstir laml .- carurM ia 9e r w e mlico unter discharges to e. W a total chlorire residual of.

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Diracter Divisier cf Licensino U.S. '-telear 9egulatcry Corrissicn Washington, DC 20555 a,irec+ct (3)

Offim cf 5%nagement anf Prcgram paalysis' U.S. Nuclear Begulatory Cmristica ~~ ~

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IfD VIOLATION REPORT Peport Number: BFIO 50-260/8047 Report Date : revember 25, 1980 Occurrence Date: tbvember 7, 1980 Facility: Browns Ebrry Nuclear Plant Condition Prior to the Violation On Novenber 7,1980, Unit 1 was operating at 1078 me ; Unit 2 was shut down for refueling; and Unit 3 was operating at 981 m e*

Description of the violation

@e Browns Ebrry Nuclear Plant (BENP) environmental technical specifications require: . "A total chlorine residual of 0.05 mg/l shall not be exceeded in the discharge of the main condenser cooling water (CCN) to the ' tennessee River due to chlorination of the Auxiliary Raw Cooling Water System (RCN) ."

We camputed total chlorine residual at the discharge of Unit 2 main condenser cooling water to the river reached 0.49 mg/1, frcm 1625 CST on November 6 to 1120 CST on November 7,1980, exceeding the maximum allowable total chlorine residual of 0.05 mg/1.

Cause of the Violation te RCW systems of all three BENP units were chlorinated frm 1625 CST on No*enber 6 to 1120 CST on Novenber 7,1980. Because Unit 2 was in a refueling outage, the main condenser cooling water pumps were not in operation and failed to provide adequate dilution to the Unit 2 Pcw discharge and violated the 0.05 mg/l limitation.

Section 2.2.2 of the environmental technical specification on chlorine states: " Concentration in the main condenser cooling water discharge will be cmputed using measured concentration and condenser cooling water and auxiliary raw cooling water flows." During the period in question the maximum measured concentration of total residual chlorine in the IG discharge was 0.49 mg/1, the Unit 2 CCW flow was zero, and the Unit 2 IG flow was 7000 gpn. %erefore, the computed discharge concentration was 0.49 mg/1.

j Corrective Action l

l Chlorination was innediately stopped upon discovery at 1120 CST on Ncvember 7,1980.

l l

-2 Analysis of the Violation The chlorinated raw cooling water was discharged into the CCW conduit which initially contained 4.53 million gallons of unchlorinated river water.

Because of the potential initial dilution and the probable chlorine demand exerted by the water. in the CCW conduit and the relatively low RCW flow, we believe that no significant adverse environmental impact was experienced in Wheeler Reservoir by this excursion.

This was supported by a sample collected from the CCW conduit at 1210 CST on November 7,1980, which contained less than 0.05 mg/l of total residual chlorine.

Action Taken to Avoid Future Violations The plant procedures for chlorinating the RCW system have been revised to include verification that the CCW pumps are operating before chlorination to ensure adequate dilution to the river.

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