ML17223A585

NPDES Noncompliance Notification:On 900212,fishkill Observed in Intake Canal of Plant.Caused by Depletion of Dissolved O2.In Event of Closure of 16 Ft Diameter Ocean Intake Pipe, Sluice Gate Will Be Gradually Raised Assuring Adequate O2

ML17223A585
Person / Time
Site:	Saint Lucie
Issue date:	03/13/1990
From:	Sager D FLORIDA POWER & LIGHT CO.
To:
References
L-90-91, NUDOCS 9003270063
Download: ML17223A585 (6)

Text

ACCELERATED DIRIBUTION DEMONS~TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9003270063 DOC.DATE: 90/03/13 NOTARIZED: NO DOCKET FACIL:50-335 St. Lucie Plant, Unit 1, Florida Power 6 Light Co. 05000335 50-389 St. Lucie Plant, Unit 2, Florida Power 6 Light Co. 05000389 AUTH. NAME AUTHOR AFFILIATION SAGER,D.A. Florida Power 6 Light Co.

RECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

NPDES noncompliance notification:on 900212,fishkill observed in intake canal of plant.

DISTRIBUTION CODE: IE23D COPIES RECEIVED'LTR ENCL SIZE:

TITLE: Environmental Event Report (per Tech Spe s)

NOTES'ECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME PD2-2 LA LTTR ENCL ID CODE/NAME LTTR ENCL 3 3 PD2-2 PD 1 1 NORRIS,J 1 1 INTERNAL: ACRS 5 5 AEOD/ DS P/TPAB 1 1 AEOD/PTB 1 1 NRR/DREP/PEPB9D 1 1 NRR/DREP/PRPB11 1 1 NRR/PMAS/ILRB12 1 1 NUDOCS- 1 1 OGC/HDS2 1 1 1 1 RGN2 1 1 RGN2/DRSS/EPRPB 1 1 EXTERNAL: LPDR 1 1 NRC PDR 1 1 NSIC 1 1 NOTE TO ALL "RIDS" RECIPIENTS'LEASE HELP US TO REDUCE WASIZl CONTACT THE.DOCUMENT CONTROL DESK, ROOM PI-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISIRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEEDl TOTAL NUMBER OF COPIES REQUIRED: LTTR 23 ENCL 23

P.O. Box14000, Juno Beach, FL 33408-0420 PIPE.,

MARSH f. 3 1990 L-90-91 10CFR50 36b U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 Gentlemen:

Re: St. Lucie Units 1 & 2 Docket Nos. 50-335 & 50-389 Environmental Protection Plan Report Unusual or Im ortant Environmental Event In accordance with Section 4.1, of the St. Lucie Unit 1 & Unit 2 Environmental Protection Plans, attached is a description of a reportable fishkill event at the St. Lucie Plant.

Very truly yours, 04D. A. ger Vice esident St. L ie Plant DAS/DMB Attachment cc: Stewart D. Ebneter, Regional Administrator, Region Senior Resident Inspector, USNRC, St. Lucie Plant II, USNRC 9003270063 9003i3 PDR ADOCK 05000335 9 PDC an FPL Group company

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DESCRIPTION OF A FISHKILL EVENT AT THE ST. LUCIE POWER PLANT The following are sequential responses for information required by the Plant's Environmental Protection Plans:

a ~ On February 12, 1990 at 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br />, a fishkill was observed in the intake canal of the St. Lucie Nuclear Power Plant. Six species of fish were found. They were:

29 Black Margate Anisotremus surinamensis 5 Sheepshead Archosar us robatoche halus 2 French grunt Haemulon flavolineatum 24 Striped mullet Mu il ce halus 27 Spade fish Chaetodi terus faber 143 Pin fish La odon rhomboides A total of two hundred and thirty (230) dead fish were found with a total weight estimated at three hundred and eighty (380) pounds.

At the time of the event Unit 1 was in a refueling outage and Unit 2 was at l

full power.

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b. On February 10, 1990 at 0100,hours,, the 16, foot cooling, water ocean intake pipe was closed by lowering the sluice gates at the intake canal headwall in order to perform work at the ocean intake structure., The pipe was reopened February 11, 1990 at 1816 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.90988e-4 months <br />. Since'there was no'water:flow through the intake pipe during this period of approximately 41 hours4.74537e-4 days <br />0.0114 hours <br />6.779101e-5 weeks <br />1.56005e-5 months <br />, there is believed to have been a depletion of dissolved oxygen in the pipe created by encrusted marine organisms and a subsequent build up of hydrogen sulfide in the water. The fishkill appears to have been a direct result of these conditions.

The dead fish were collected, identified and separated according to species. An approximate weight was established, and the dead fish were subsequently disposed of onsite.

c ~ Since no additional fish were dying at the time the event. was observed, no immediate action was necessary to prevent further mortality.

In the event that the 16 foot diameter ocean intake pipe is to be fully closed in the future for a period greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the following precaution will be taken to minimize possible future fishkills:

The 16 foot intake pipe sluice gate will be gradually raised to allow for the introduction of water from the pipe into the intake canal, thereby assuring adequate oxygen levels in the intake canal water.

In the event that the gradual introduction of water from the pipe into the intake canal does not prove to be effective, aeration of cooling water at the intake headwall area will be considered in order to assist in increasing dissolved oxygen (DO) levels to prevent marine organism mortality.

The Nuclear Regulatory Commission, via Jan Norris, St. Lucie Plant Project Manager, was notified of the event on February 13, 1990. Mr. Norris stated that he would review FPL's written report. FPL s determination of reportability was made by FPL biological specialists in the Company's Environmental Affairs Department through a systematic evaluation of the event.