ML19324B688

NPDES Noncompliance Notification:On 891025,plant Released Free Available Chlorine at Concentration of 0.2 mg/1.Caused by Svc Water Chlorination Sys Inadvertently Placed in Continuous Addition Mode W/O Dechlorination Sys Operating

ML19324B688
Person / Time
Site:	Perry
Issue date:	10/30/1989
From:	Kaplan A CLEVELAND ELECTRIC ILLUMINATING CO.
To:	Gomes E OHIO, STATE OF
References
PY-CEI-OEPA-009, PY-CEI-OEPA-9, NUDOCS 8911080012
Download: ML19324B688 (2)

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THE CLEVELAND ELECTRIC ILLUMINATING COMPANY l l

• .o. sox DF 5 P385 M, opeo 4 east 5 TetsPHONE (rist8063787 5 ADostes10 osWfsA Mo40 I PMoM UltVsLANo 47618e0 5 Totax: setene ANews8m40A. om Payo Al Kaplan , Serving The Best locetion in the Nation l

• "***W PERRY NUCLEAR POWER PLANT l

"# " October 30, 1989 PY-CE1/0 EPA-0091L Mr. Ermelindo Gomes Environmental Engineer I Di*/ision of Water Pollucion Control i Ohio EPA, Northeast District Office  !

2110 East Aurora Road i Twinnburg, Ohio 44087

• f Re Noncompliance Notification f

i 7 Dear Mr. Comes i lu accordance with Part 111, paragraph 12.A. of OEPA Permit No. 31800016*CD, this notification is hereby submitted for a reportable event which occurred on  !

Oc tober 25, 1989. I Outfall No. Plant Discharge Location Parameter Discharge Limit Date I 31100016004 Perry Discharge Tunnel Free Avail 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> <2 hours 10/25/89  ;

Chlorine l L

Event Description  !

The Ferry Plant Discharge Tunnel teleased free available chlorine at an approximate concentration of 0.2 mg/l between the hours of 10:10 AM and 9:35 i PM (approximately 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> of actual discharge occurred during this period) on  !

, October 25, 1989. The event occurred because the Service Water Chierination i

. System was inadvertently placed in a continuous addition mode without the Dochlorination System operating. The Service Water Chlorination Systes {

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L rormally injects aedium hypochlorite for a 1/2 hour period twice per day,  ;

j' during which time the Dechlorination System is automatically initiated. l 1

The hervice Water Chlorination Systen 4 normally contro11.ed by 2 timers which j set the frequency of sodium hypochlorite addition (every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />) and the duration of each addition (1/2 hour). During a chlorination period, which l started at- 10:10 AM on October 25, 1989, the Service Water Weir Structure l (upstrese of the Dechlorination System injection point) was sampled at 10:30 AM and had a free available chlorine concentration of 0.45 mg/1. At 10:35 AM it was discovered that the Dechlarination System had failed to start per its automatic function, due to a power ourage. At 10:40 AM the Plant Discharge j Tunnel was easpled and had a free available chlorine concentration of 0.20 -

ag/1. Af ter the sample was taken of the Plant Discharge Tunnel, the  !

Dochlorination System was manually started. At 11:00 AM the Plant Discharge Tunnel was re-sampled and no f ree available chlorine was detected. After the t chlorination cycle was confirmed to have been completed, the dechlorination  ;

pump was secured. At 11:15 AM the technician was directed to adjust the 8911080012 891030. [

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[ . . Mr. E. Comes Octsber 30, 1989

, PY-CE1/0 EPA-0091 L l

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Service Water Chlorination timers to prevent further chlorination cycles until <

the cause of the dochlorination problem could be determined. However, the l timers were mistakenly placed in a position which caused continuous (

chlorination. At 6:00 PM the sodium hypochlorite storage tank was found empty I and was refilled. 1,ater evaluations determined that the tank was empty at l approximately 3:40 PM, based on sodium typochlorite addition rate. At 9:30 PM i the problem was discovered, and immediate actions were taken to manually start  !

the Decielorisation system (which was still in a power outage). The timers I were also reset to their normal position so that the chlorination cycle would  !

be completed at 10:00 PM. At 9:35 the Plant Discharge Tannel was sampled and )

no free available chlorine was detected. At 10:00 PM the Service Water Weir l Structure was sampled and had a f ree available chlorine concentration of 0.40 ag/1. l The iree available chlorine release through ther plant discharge tunnel was  !

stopped at 9:35 PM when the Dechlorination System was confirmed operational. '

'!he release duration was approximately 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> based on the total time minus i the periods when the Dechlorination System was in operation and the sod!ue .(

hypochlorite storage tank was empty. Sample results for free available  ;

chlorine of the Discharge Tunnel (0.2 ag/l at 10:40 AM) and the Service Water {

Weir Structure (0.45 mg/l at 10:30 AM and 0.40 mg/l at 10:00 PM) indicate that '

the f ree available chlorine daily concentration limit of 0.5 mg/l was not i exceeded during the event.

t

.;.e cause of this incident was the improper shutdown of the Service Water i Chlorination System. A technician used the wrong procedure. The procedure that was used addressed a study of chlorination doses needed to control sobra j

! oussel infestation. It did not provide direction for shutting down the  !

system. The technician had not received training concerning system shttedown '

and did not know another procedure existed for this task. The power outage }

l which prevented the start of the Dechlorination System was also a contributing  !

factor, j

To prevent recurrence all applicable technicians and supervisors will receive f On-The-Job and Classroom traininr to further expand system knowledge and i ensure the correct operation, using the proper procedures, of all Chlorination and Dechlorination Systems. In addition, applicable plant procedures will be reviewed and revised to ensure that power outages that will affect the 3

ll operation of the Chlorination or Dochlorination systems are recognized and ,

acted upon to prevent any future recurrence of this event. ,

Please contact me if you have any questions.

Sn r ly,  !

• e Al Kaplan Vice President Nuclear Group AKinjc cca Document Control Desk, NRC T. Colburn P. Hiland Region III Mr. R. Retsler (Lake County Emergency Planning Committee)

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