ML19320A147

Nonroutine Nonradiological Environ RO 50-313/74-08:on 741211,fish Impingement on Intake Screens for 24-h Period Totaled 5,254 Lbs.Caused by Natural Dying Off of Threadfin Shad.Facility Effects on Ecosystems Being Reviewed

ML19320A147
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/18/1974
From:	Cavanaugh W, Phillips J, Rueter D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19320A144	List: ML19320A143 ML19320A147
References
NUDOCS 8004140741
Download: ML19320A147 (3)

Text

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1. Non-Routine, Non-Radiological Environmental Report No. 50-313/74-8 1

2. Report Date: 12/18/74 3. Occurrence Date: 12/11/74

4. Facility: Arkansas Nuclear One-Unit 1 Russellville, Arkansas

. S. Identification of Occurrence:

Fish kill on intake screens exceeding 3000 pounds based on an 8-hour

[ -sample period.

{ 6. Conditions Prior to Occurrence:

Steady-State Power Reactor Power -

Wth ~'

4 Hot' Standby Net. Output --

We Cold Shutdown Percent of Full Power -

i Refueling Shutdown i

Routine Startup

,j Operation

l Routine Shutdown ~

Operation 4

Load Changes During Rautine Power Operatihn 100 2 0 0%

l Other (Sneify) X Four circulating water pumps were in operation. Water temperature at inlet to the condenser water box was 45*F and ambient air temperature .

, was 39'F at 8:00 A.M.

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7. Description of Occurrence:

During routine fish impingement monitoring 12/11/74, using procedure -<

1607.10, Monitoring Fish Impinged on ANO-1 Intake Screens,'1751 pounds {

of fish .were collected during an 8-hour sample period. The projected '

fish kill for the 24-hour period beginning at 8:00 a.m.12/11/74, and ending at 8:00 a.m. 12/12/74, was 5254 pounds based on the 8-hour, '

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sample. A mixture of gi::ard and threadfin shad made up 99.9% of the '

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

Thr adfin shad made up 96.5% of the total number of shad.

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Non-Routine, Non-Radiologican Environmental Report No. 50-313/74-8 S.- Designation of Apparent Cause of Occurrence:

3 Design Procedure Manufacture Unusual Service

.! Condition Including Installation / Environmental Construction Component Failure Operator Other (Specify) x The apparent cause was due to a natural dying off of threadfin shad during the winter season.

, 9. Analysis of Occurrence:

1-O's'j The only noticeable Environmental Impact was the removal of the above .

mentioned fish from the lake. The fish that were collected were dis-posed of through land fill operation. The fish that were not collected were disposed of through the trash disposal system, e

! 10. Corrective Action:

1 Long term studies are in progress to determine the effects of plant operation on the aquatic ecosystems of the Dardanelle Reservoir. Data j from this report and other data obtained is fed back into these studies to determine what changes might be made to the studies in order to ensure that adequate data is obtained for evalu'ating plant impact. ,

Review by APGL and its consultants of the results of these studies will j

determine what corrective action might be taken to reduce plant effects on the Reservoir.

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I Non-Routine, Non-Radiological Environmental Report No. 50-313/74-8

11. Failure Data:

The circumstances of this report are similar to those reported in Non-Routine, Non-Radiological Environmental Reports No. 50-313/74-1 through 50-313/74-7.

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12. Devicus and Approvals:

Reviewed and Approved by: Plant Safety Committee Yes (X) No ( )

m Plant Superintendent

) Yes (X) No ( )

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Reference:

JWA-729

- I Dato: 12/16/74 I l

Rev1 cued by: 2s a unte: / /f 7Y

' LicensinS'upervisor

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Approved by:hhk//, /;"7 d( Datc; jf... /.?' N

/ S'a 'ty c' view am'ttee ' -/

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.\pproved by: N I ~wM 7 Date: j *!/# 7

!4dager of Nuclear Servi .cs ' '

Approved by: ,,'?.

}k. //; Y$-96 Y, Dato: /l r', ?* .T.V

/. Director of Power Production Approved by: '

.<[/ .[ e . Date: /' T' #/

• 3 Senior Vice 'P-re::ident '

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