ML19319E416

Nonroutine,Nonradiological Environ Rept 50-313/75-12:on 750213,during Routine Fish Impingement Monitoring,Fish Kill on Intake Screens Exceeded 3,000 Lb for Two 8-h Periods. Caused by Natural Winter Die Off of Threadfin Shad

ML19319E416
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/20/1975
From:	Phillips J, Woodward J ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19319E373	List: ML19319E372 ML19319E383 ML19319E391 ML19319E399 ML19319E406 ML19319E416 ML19319E429
References
NUDOCS 8004100698
Download: ML19319E416 (3)

Text

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1. Non-Routine, Non-Radiological Environmental Report No. 50-313/75-12

2. Report Date: 2/20/75 3. Occurrence Date: 2/13/75

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

. 5. Identification of Occurrence:

Fish kill on intake screens exceeding 3000 pounds based on two 8-hour sample periods.

6. Conditions Prior to Occurrence: ,. ~

Steady-State Power Reactor Power 2525 MWth Hot Standby- Net.0utput 839 MWe Cold Shutdown Percent of Full Power 99 %

Refueling Shutdown -

Routino Startup Operation p Routine Shutdown g i Operation '

V Load Changes During Routine Power Operation

• v Other (Specify) Four circulating water pumps were in operation.

7. Description of Occurrence: -

, During routine fish impingement monitoring 2/13/75., using procedure 1607.10, Monitoring Fish Impinge'd on ANu-1 Intake Screens, 5110 pounds of fish were collected during two 8-hour sample periods. Fish impinged on the intake screens between 8:00 a.m. and 4:00 p.m. 2/12/75 totaled 3995 pounds. F,ish impinged on the intake screens between 12:00 a.m. ~;'

and 8:00 a.m. 2/13/75 totaled 1115 pounds. The projected fish impinge-ment for the 24-hour period beginning at 8:00 a.m. 2/12/75 and ending at 8:00 a.m. 2/13/75 was 7665 pounds based on the' hourly average of the ,

two 8-hour samples. A mixture of gizzard and threadfin shad made up -l 99.9% of the. total weight of fish. Other fish made up' O.1% of the j total weight. Threadfin shad made up 86% of the total number of shad. -

Temperatures taken at 8:00 a.m. 2/13/75 were: intake water temperature -

44.3*F, and ambient air temperature - 26*F.

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8004109 { 9 P July 5, 1974 NSP-10, Rev. O Page 1 of 3 "

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Non-Routine, Non-Radiological Environmental Report No. 50-313/75-12

8. Designation of Apparent Cause of Occurrence: ,

Design Procedure Manufa cture Unusual Service Condition Including Installation /

Environmental Construction -

Component Failure Operator Other (Specify) X .

The apparent cause was due to a natural die off of threadfin shad during the winter season. ,

9. Analysis of Occurrence:

g _,) 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.

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10. Corrective Action:

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Long term studies are in progress to determine the effects of plant operation on the aquatic ecosystems of the Dardanelle Reservoir. Data 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 evaluating plant impact.

Review by Arkansas Power 5 Light Company and its consultants of the '

results of these studies will determine what corrective action might '

be taken to reduce plant effects on the Reservoir.

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July 5, 1974 NSP-Th, Rbv. O Page 2 of 3

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%d Non-Routine, Non-Radiological Environmental Report No. 50-313/75-12

11. Failure Data:

The circumstances of this report are similar to those reported in Non-

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Routine, Non-Radiological Environmental Reports No. 50-313/75-1 through 50-313/75-11.

12. Reviews and Approvals:

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

Plant Superintendent Yes (X) No ( )

Reference:

JNA-874 Date: 2/19/75 Reviewed by:

Date: M 7J~~

LiceIsi'ng Supervisor '

Approvedbyth,T,.F//X

p. . . .-

py/f [ .

Date:. ,S ' IT -2 5

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ommittee i

. Approved by: A ', N - mm' Date: 2_ / 2.> / 74 eManager off uclear Servibes / #

Approved by:e ' k. '[e ,> >- (de. Date: ,O-[8'b

/ ' Director of Power Product'ion Approved by: '-/' [ ,'

Date: [ 7 .

Senior Vice ' President e

(,x s]

f July 5, 1974 NSP-10, Rev. O Page 3 of 3