ML20054F736

RO 82-40:on 820514,low Vol Wastewater Treatment Facility Effluent Ph Exceeded Limit & Effluent Composite Contained 17 Mg Total Suspended Solids.Caused by M.U.D. Acid Sump 820512 Overflow During Regeneration of Train B

ML20054F736
Person / Time
Site:	LaSalle
Issue date:	05/26/1982
From:	Holyoak R COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
RO-82-40, NUDOCS 8206170266
Download: ML20054F736 (5)

Text

T Commonw:cith Edison

. c_:- LaSalle County Nuclear Station

- Rural Route #1, Box 220

• '~ Marseilles, Illinois 61341 Telephone 815/357-6761

$0 '313 May 26, 1982 Mr. James G. Keppler Regional Administrator Director of Regulatory Operations - Region 111 U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Sir:

In accordance with LaSalle County Station Unit 1 Faci 1ity Operating License NPF-11, Appendix B, Section 3.2, we are submitting to you a copy of the NPDES noncompliances for LaSalle County Nuclear Generating Station Permit No. IL0048151.

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Supe ri n tenden t' LaSalle County S tion RHH/GW/psl Enclosure cc: DVR Report 1-1-82-40 JUN 151982 8206170266 820526 PDR ADOCK 05000373 S ppg

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l. DEVIATION REPORT NUMBER: 01-01-82-40

11. LASALLE COUNTY STATION: Unit I til. EVENT DESCRIPTION:

On May 14, 1982, it was determined that the WWTF had an effluent pH of 3.5 S.U., and on 5/15/82 the WWTF effluent composite was determined to contain 17 mg/l total suspended solids. This condition persisted until 5/24/82. These exceeded the N.P.D.E.S. Permit limits of 6.0 - 9 0 pH and 15 mg/l total suspended solids. A total of 136,400 gallons was discharged to the Cooling Pond during this noncompliance.

IV. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

This occurrence did not affect the health and safety of the general public. This is not a frequent occurrence.

V. CAUSE On 5/12/82, the M.U.D. acid sump, 0WM06, overflowed 3 times during regen-eration of M.U.D. train B. This overflow went to the M.U.D. clean sump, OWM05, and eventually to the WWTF. This resulted in lowering the pH of the WWTF to 3 5 S.U. The WWTF was not sampled until 5/14/82, at which time all discharges to this outfall were sampled to determine the catie.

However, all these discharges had returned to wi thin allowable pH lin i ts.

The low pH of the Wastewater resolubilized the coagulated iron and so: Ids resulting in these solids passing through the Media Filters into the effluent. _

VI. CORRECTIVE ACTION:

No corrective action was taken to return the WWTF to inspect operation as the plant had a full inventory of water and there was no available space to transfer the water for neutralization.

The clean sump manhole cover has been securely fastened to aid in prevent-ing further in-leakage. A work request, #15738, has been submitted to change the acid sump level alarm as a further aid in preventing sump overflows.

Further investigations have shown that the orifice plates in the backwash lines could have been left out during the last maintenance on the Makeup Demins. Work requests, #15895, 15896 and 15898, have been submitted to replace the orifice plates.

Prepared by: P. Knoll

,- Commonwealth Edison LaSalle County Nuclear Station RuralRoute 81 Box 220 Marseilles, Illinois 61341 Telephone 815/357-6761 May 24, 1982 U. S. Environmental Protection Agency Region V, Enforcement Division ATTN: Chief, Compliance Unit 230 South Dearborn Street Chicago, Illinois 60604 1111nois Envi ronmental Protection Agency Division of Water Pollution Control Compliance Management Unit .

2200 Churchill Road Springfield, Illinois 62706

SUBJECT:

NPDES Noncompliances for LaSalle County Nuclear Generating Station Permit No. ILOO48151

Dear Sir:

In accordance with Standard Condition 12, we wish to submit the followi,ng notices of noncompliance. The Cooling Pond was blowing down at the time of these noncompliances.

If there are any questions, please contact Mr. Charles L. Nash of my staff, at (815) 357-6761, extension 235 k s/ulet R. H. Ho -

nn % ri ndent

@.4 RHH/FRL/CLN/gew cc: Director of Water Quality, Environmental Affairs Manager, Nuclear Stations Division he/

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LAsa m COUNTY NUCLEAR GENERATING STATION N.P.D.E.S. PERMIT NO: ILOO48151 NONCOMPLIANCE REPORT 001c - Low Volume Waste DISCHARGE NUMBER AND DESCRIPTION: Wastewater Treatment Facility (WWTF)

PARAMETER AND PERMIT LIMIT:

pH, 6.0 - 9 0 S.U.

NONCOMPLIANCE, DATE, AND DURATION:~ 3.5 S.U., 14MAY82, continuous 3 5 S.U., 15MAY82, continuous 4.0 a. U., 17MAY82, continuous 3.8 S.U. ,16MAY82, continuous 4.1 S.U., 17MAY82, continuous 4.8 S.U., 194AY82, continuous 4.7 S.U. , 20MAY82, continuous 4.4 S.U., 19MAY82, continuous 4.7 S.U. , 21MAY82, continuous A total of 136,400 gallons was discharged to the CAUSE g NONCOMPLIANCE:

9 n e Ped oi On 12MAY82, the M.U.D. acid sump, OWM06, overflowed 3 times during the regeneration of M.U.D. train B. This overflow went to the M.U.D. clean sump and ultimately to the WTF, resulting in low effluent pH of 3.5 S.U.

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CORRECTIVE ACTION:

• The low pH of the WTF was not determined until 14MAY82, at which time the sumps were sampled and determined to be within allowable limits. As all inputs to the WTF had returned to normal by this time, and the WWTF had a full inventory of water, no corrective action was taken to return the plant to normal operation, lowever, the problem of the sumps overflowing is still being investigated by the Operating Department.

14MAY82 DATE RECOGNIIED AS,A VIOLATION:

16MAY82 CATE INVESTIGATED:

e LASALLE COUNTY NUCLEAR GENERATING STATION N.P.D.E.S. PERMIT NO: ILOO48151 NONCOMPLIANCE REPORT DISCHARGE NUMBER AND DESCRIPTIOP: 001c - Low Volume Waste Wastewater Treatment Facill ty (WWTF)

PARAMETER AND PERMIT LIMIT: Total Suspended Solids. 15 mg/l NONCOMPLIANCE, DATE, AND DURATION: 17 mg/1, 15MAY82, continuous CAUSE OF NONCOMPLIANCE:

On 12MAY82, the M.U.D. acid sump, OWM06, overflowed 3 times during the regeneration of M.U.D. train B. lhis overflow went to the M.U.D. clean sump and ultimately to the WWTF, resulting in a low plant pH of 3.5 S.U. This low pH wastewater resolu-bilized the coagulated iron and solids and allowed them to pass through the Media filters into the effluent.

CORRECTIVE ACTION:

The low pH of the WWTF was not determined until 14MAY82, at which time all sumps leading to this outfall were sampled and determined to be within allowable limits.

As all inputs to the WWTF had returned normal by this time, and the WWTF had a full inventory of water, no corrective action was taken to return the plant to normal operation. However,~~the problem of the sumps overflowing is under investi-gation by the Operating Department.

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e DATE RECOGNIZED g A VIOLATION:

16MAY82 DATE IN7ESTIGATED-M