ML19319E598

Nonroutine Nonradiological Environ RO 50-312/74-06:on 741205,fish Impingement on Intake Screens for 24-h Period Totaled 5,370 Lbs.Caused by Lake Temp Decrease in Winter. Long-term Studies in Effect to Determine Environ Impact

ML19319E598
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/11/1974
From:	Rueter D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19319E595	List: ML19319E594 ML19319E598
References
NUDOCS 8004140601
Download: ML19319E598 (3)

Text

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50-313/74-6 Non-Routine, Non-Radiological Environmental Report No.

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3. Occurrence Date: 12/5/74

2. Report Date: 12/11/74 i 4. Facility: Arkansas Nuclear One-Unit 1 Russellville, Arkansas l

l. 5. Identification of Occurrence:

Fish kill on Intake Screens exceeding 3000 pounds based on une 8-hour sample period. '

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6. Conditions Prior to Occurrence: .

2163 FMth X Reactor Power Steady-State Power _

712 FMe Net. Output Hot Standby Percent of Full Power 84 _%

Cold Shutdown Refueling Shutdown Routine Startup Operation I Routine Shutdown ,

i Operation )

Load Changes During Routine Power Operation i

Other (Specify) 4 circulating water pumps were in operation.

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7. Description of Occurrence:

i During routine fish impingement raonitoring 12/5/74, using procedure ,

1607.10 (Monitoring Fish Impinged on ANO Intake Screens),1790 pounds The proj ected .l of fish were collected during an 8-hour sample period.

fish kill for the 24-hour period beginning at 8:00 a.m.12/5/74 andA l

ending at 8:00 a.m. 12/6/74 was. 5370 based on the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> sample.

, mixture of gizzard and threadfin shad made up 99.9% of the totalshad Threadfin weight of fish.

Other fish made up .1% of the total weight.

made up 95% of the total number of shad. .

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8 0 0 4140 ffq .

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Non-Routine, Non-Radiological Environmental Report No. 50-313/74-6

8. Designation of Apparent Cause if Occurrence:

j Design Procedure

'l - Manufacture Unususi Service Condition Including Installation / Environmental Construction Component Failure _

Operator Other (Specify) x The apparent cause was due to a decrease in lake water temperatur(

caused by cold weather. ,

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' 's 9. Analysis of Occurrence:

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The only noticeable Environmental Impact was the removal of the al .

mentioned fish from the lake. The fish that were collected were disposed of through landfill operation. The fish that were not collected were disposed of through the trash disposal system.

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10. Corrective Action:

Long term studies are in progress to determine the effects of p1'ar

! operation on the aquatic ecosystems of the Dardanelle Reservoir.

from this report and other data obtained is fed back into these s-to determine what changes might be made to the studies in order t<

ensure that adequata data is obtained for evaluating plant impact- -

Raview by APf L and its con'sultants of the results of these studi~ct i determine what corrective action might be taken to reduce plant-ci on the Reservoir.

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July 5, 1974 '

NSP-lb, Rev. O Page 2 i i

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U: i Non-Routine, Non-Radiological Environmental Report No. 50-313/74-6 1 11. Failure Data:

The circumstances of this report are similar to those reported in j, Non-Routine, Non-Radiological Environmental Reports 50-313/74-1, j 50-313/74-2, 50-313/74-3, 50-313/74-4, and 50-313/74-5.

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12. Reviews and Approvals:

Reviewed and Approved by: Plant Safety Cocmtittee Yes (4 No ( )

j Plant Superintendent Yes (}) No ( )

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- Referenec: .JWA-715 Date: 12/9/74

• Reviewed by: uate: / / 7f

! Licensirig ' Supervisor Date: / 7 " /2 -- h/'

Ap'>rovedby!/ ,f// / / ' 1w . -

• / '" '5ty R'cv'iew Cori ittee /

. Approved by

/u 47~ em Date: .'E/// /7 Manager of Nuclear Services /

Approved by: / /,Y'/ . M# j tr/ Dato: M V . .' '

f director of,, Power Prod'uction

- Approved by:  ? ,e- Date:  ! /- m

' Senior Vice Pr'esident -

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U I July 3, 1974~ NSP-10, Rev. O Page 3 of 3

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