ML20029B951

NPDES Noncompliance Notification:On 910225,total Residual Chlorinel & Residual Halogen Daily Max Above Limit.Caused by Hypochlorite Dosage Being Higher than Normal Due to Variable Hypochlorite Pump Discharge Pressure

ML20029B951
Person / Time
Site:	Quad Cities
Issue date:	03/05/1991
From:	Bax R COMMONWEALTH EDISON CO.
To:	ENVIRONMENTAL PROTECTION AGENCY
References
RLB-91-74, NUDOCS 9103190144
Download: ML20029B951 (2)

Text

_ _ _ _ _ _ __

9 3

y Deh k ,

Commonwealth Edison Quad Cities Nuclear Power Station 22710 206 Avenue North Cort.ove, Illinois 61242 INIONIIYIOUIIk!

Telephone M9/654 2241 gr At p{p d hp _

pr RLB-91-74 # f R" h="=

lil '

March 5, 1991 Illinois Environmental Protection Agency Division of Water Pollution Control Compliance Management Unit 2200 Churchill Road Springfield, Illinois 62706 U.S. Environmental Protection Agency Region V, Enforcement Division Attention: Chief Compliance Unit 230 South Dearborn Street Chicago, Illinois 60604

Subject:

NPDES Non-Compliance for Quad Cities Generation Station IL-0005037

Dear Sirs:

In accordance with Standard Condition 12 we wish to submit the following notice of non-compliance:

DISCHARGE: 006 & 007 Open Cycle Diffusers PARAMETER AND PERMIT LIMIT: Total Residual Chlotinel/ Total Residual Halogen. Daily max 0.2 mg/L NON-COMPLIANCE AND DATE: Total Residual Chlorine / Total Residual Halogen. Daily max was 0.43 mg/L on 2/25/91 CAUSE: There are several factors that contributed to the non-compliance. 1) The hypochlorite dosage was slightly higher than normal do to variable hypochlorite pump discharge pressure, resulting in a higher injection rate. 2) The condenser reversing valves leak.

It was calculated that at the time of the hypo / bromide injection 16%

of the circulating water bypassed the condenser. If all the sodium bromide / chlorine solution would have gone through the condenser the sodium bromide / chlorine solution would have been consumed by the high demand inside the condenser. 3) There were only two circulating water pumps on reducing the dilution factor in the discharge bay by at least half. The circulating water bypassing the condenser was probably the main cause for the TRO daily limit being exceeded. The daily load limit was not exceeded.

9103190144 910305 MAR 111991 PDR ADOCK 050002S4 PDR 7623 ,

S

/

w k

t i

CORRECTIVE ACTION: When the high TRO level was Jetected at the release point the hypo / bromide injection was stopped.

The existing hypochlorite pump stroke will be reduced to eliminate the higher dose rates even if the pump discharge pressure varies and to account for biocide bypassing the condenser.

The existing hypochlorite and sodium bromide pumps will be replaced in the very near future with a newly designed pump skid. This will eliminate varying pump discharge pressure and provide constant flow rate.

The condenser reversing valves will be worked on during the next unit refueling outage scheduled for the fall of 1991.

The normal number of circulating water pumps that are on is a minimum of four and a maximum of six. The operating procedure for the sodium bromide / chlorine solution injection will be changed to reduce the amount of sodium bromide / chlorine lajected when less than four circulating water pumps are on.

If there are any questions, please call Ray !!oore of my staff at 309-654-2241, Extention 2731.

Sincerely, RL%

R.L. Bax Station Manager Quad-Cities l RLP/RM/ dis l

l CC: B. Davis, NRC l

Director of Water Quality, Environmental Affairs l