ML19332G054

NPDES Noncompliance Notification Rept for Oct 1989.On Two Occasions,Total Residual Chlorine Exceeded 0.2 mg/1 Concentration Limitation at Outfall 001 & 2 H Time Limit for Discharging Chlorine Exceeded.Investigation Underway

ML19332G054
Person / Time
Site:	Mcguire, McGuire
Issue date:	11/27/1989
From:	Haller W DUKE POWER CO.
To:	NORTH CAROLINA, STATE OF
References
NUDOCS 8912200096
Download: ML19332G054 (2)

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'J Dvus Powen COMPANY  ;

P.O. BOX 33189  !

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WILLIAM A.HALLER MANAGFA i J /.? %WLEAMT HN $48tVICES t

Novenbar 27, 1989

• I Division of Environmental Management >

Water Quality Section Attention: Central Files P. O. Box 27687 [

Raleigh, NC 27611 i

Subject:

Duke Power Company l NPDES Monitoring Report for b McGuire Nuclear Station - NC0024392 File: MC-702.25  ;

Dear Sir:

In accordance with Part II, C(2) of the above referenced NPDES permit, duplicate copies of the monthly monitoring report for October, 1989 are enclosed. ,

P on two (2) separate occasions,.the total. residual chlorine was reported l- to have exceeded the 0.2 mg/l concentration limitation at outfall 001.

~ Additionally, the two (2) hour time limit for discharging chlorine was  ;

also reported to have exceeded the limit on two separate occasions. Based . i on the information we have available to us, it is believed that the monitoring r results are incorrect due to some type of unknown analytical interference.

Using .our analytical methods, measurements at the station intake have indicated a " total residual chlorine" concentration of between 0.05 and'

[ 0.07 mg/1. Also, a total residual chlorine' concentration, greater that 0.2 mg/1, was measured on the unit discharge when no chlorine was being added.

Futhermore, during those times when chlorine addition was planned and prior to adding any chlorine, it was calculated how much chlorine could be added without exceeding 0.2 mg/l at the discharge point. At no time however was this calculated amount ever exceeded.

An investigation is continuing as to what is causing this apparent analy-tical interference. It is known that, at these low concentrations, any oxidant in the water will respond as a " total chlorine residual." Chlori-nation of our systems have been discontinued until it can be determined what interferences are influencing our chlorine analyses. The Mooresville Regional Office was notified of the exceedance on October 13, 1989, f6 I o I ,

8912200096 891127 -

PDR ADOCK 05000369

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-Please direct any correspondence or questions concerning the 'McGuire Nuclear Station NPDES Program to M. C. Origgs (704) 373-7080, Nuclear.  ;

Environmental Compliance. ,

Very truly yours,  !

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w. - A. taller,-Manager Nuclear Technical Services' IWM/rrab:0505  ;

Attachments-I xc:- R. P. Mic.Tel (NRC Contro1~' Desk s R. W. Eaxer S. D. Ebneter  ;

D. W. Phillips P. K. VanDoorn M. E. Bridges i J. S. Cartor l Etr.ff (rotta)

MC-2( 02. 03-01 b

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