ML19320A299

Nonroutine Nonradiological Environ Rept 50-313/75-24:on 750227,fish Collected on Intake Screens Exceeded 3,000 Lb During 8-h Period.Caused by Natural Die Off of Threadfin Shad During winter.Facility-ecosystem Studies in Progress

ML19320A299
Person / Time
Site:	Arkansas Nuclear
Issue date:	03/07/1975
From:	Cavanaugh W, Phillips J, Rueter D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19320A281	List: ML19320A280 ML19320A287 ML19320A299
References
NUDOCS 8004210579
Download: ML19320A299 (3)

Text

_ __ . _ _.

.. n

(~)-

A lG i 1.

Non-Routi'ne, Non Radiological Environmental Report No. 50-313/75- 24

2. Report Date: March 7, 1975 3. Occurrence Date: February 27, 1975

4. Facility:

Arkansas Nuclear One - Unit 1 Russellville, Arkansas

. 5. Identification of-Occurrence:

Fish Kill on Intake Screens exceeding 3000 lbs. based on 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> sample 6.

Period.

Conditions Prior to Occurrence: .,

Steady-State Power X Reactor Power 1357 MNth __

llot Standby Net. Output 400 Mwe Cold Shutdown Percent of Full Power 52.8 g Refueling Shutdown Routine Startup

• Operation

's i Routine Shutdown 1

Operation -

Load Changes During Routine Power Operation Other (Specify) 4 circulating water pumps in operation s:,

7. Description of Occurrence:  !

During routine fish impingement monitoring 2-26-75 using procedure 1607.10, Monitoring Fish Impinged on ANO-1 Intake Screens,1055 lb. of fish were collected during an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> sample period. The projected fish kill for the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period beginning at 8:00 a.m. 2-26-75 and ending at 8:00 a. m. on __

2-27-75 was 3165 lb. based on the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> sample. A mixture of gizzard and -

threadfin shad made up 99.9% of the total weight of fish. Other fish made up 0.1% of the total weight. Threadfin Shad made up 85% of the total number of shad. Temperatures taken.at 4:00 p. m. on 2-26-75 were: Intake water temperature 44 degrees F. and ambient air temperature 52 degrees F. ~

+

l

! .- I

("'%

' k%~s/

mm i July 5, 1974 NSP-10, Rev. O 8004210 h -

Page 1 of 3 w _

}

-y/

- Non-Routino, Mon-Radiologica1' Environmental Report No. 50-313/75 24

8. Designation of Apparent Cause' of Occurrence:

• Design Procedure

~ Manufacture - Unusual Service Condition Including Installation / Environmental Construction Component Failure , ,

Gt.hcr (Specify) The apparent cause was due to a natural die off of ~~

Threadfin Shad during the winter season {

i I

. l 1

9. Analysis of Occurrence:  ;

There has apparently been no adverse environmental impact due to the large V[ numbers of Shad being impinged at the intake of ANO-1. . Wintertime mortality of threadfin shad due to low temperatures is not unusual due to their lack

- 1 of resistance to low water temperatures. The ANO-1 intake screens only collect the shad after they'become unable to resist the intake current due to lethargy caused by a decrease in water temperature.

Due to their fecundity, threadfin shad can withstand a substantial decresise s in population each winter and still maintain a population suitable for forage by game fish. g The fish that were collected during sampling periods were disposed of through landfill operation. The fish that were not collected were ground in a trash grinder and returned to Lake Dardanelle.

~;

10. CORRECTIVE ACTION:

Long term' studies ra'e in progress-to determine the ei acts of plant operation on the :\quatic ecosystems of the Dardanelle Reservoir. Data from this report. and other data obtained is fed back into these studies *l to determine what changes might be made to the stud: in order to ensure -

that adequato data is obtained for evaluating plant i .apact . Review by Arkansas Power 6 Light and its consultants of the results of these studies will determine what corrective action might be taken to reduce plant effects on the Reservoir. .

/m

\

\

v]

July 5, 1974 NSP-ID, Rev. O Page 2 of 3 L

l

.. m p

' 'l

\

Non-Routine, Non-Radiological Environmental Report No. 50-313/75- 24

11. Failure Data:

The ciretastances of this report are similar to those reported in Non-Routine, Non-Radiological Environmental Reports No. 50-313/75-1 through 50-313/75-23.

• 4 t

J

12. Reviews and Apyroval's:

Revicued and Approved by: Plant Safety Comi:tittec Yes ( $ No ( ) '

Plant Superintendent Yes ( $ No ()

) Refernnec:

d JWA - 893__. Date:_?farch 3, 1975 -

Reviwed by: E

,. / g vate: 3[p[9d-Licensing Su crvisor Approved by: [' k ,d / / /4' uf Date': ) ' N #

,/ afet eview Ti ce ' '

' g.

Approved by: A* '&b / ,PMvm_

Date: ._7 /'s 7 bEoger of thTE[ car Servico '

[

Approved by: . /Y/h'/hh <ZrM '/./ Date: I $ ~ 2

/' 'D'iIector of Power.Productioii Approved by: 'i', - L 1" '

2T Da r.c :

• Senior Vico Pt'esident 9 -

A l l

f\_ ')

l

. l

. {

1 July 5, l'iT4 IISP-10, Ray. O

- Page 3 of 3 l I

, .- ,- . , __, _ , , , . . . - . - - - - - . , .