ML19317G302

RO 77-40E:on 770421,fish Impingement Sampling Stopped by Clogged Collecting Devices.Caused by Large Accumulation of Ctenophores in Baskets.Effective Filtering Area of Collecting Baskets Increased

ML19317G302
Person / Time
Site:	Crystal River
Issue date:	05/13/1977
From:	FLORIDA POWER CORP.
To:
Shared Package
ML19317G295	List: ML19317G294 ML19317G302
References
NUDOCS 8002280917
Download: ML19317G302 (1)

Text

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. ENVIRORIENTAL I.ICENSEE EVENT REPORT (#77-40E) d

1. Facility: Crystal River Unit #3

2. Report Date: 13 May 1977

3. Occurrence Date: April 21, 1977

4. Identification of Occurrence:

I=pingeme$t sa:pling of fish and shellfish of Units 1, 2 and 3 was discontinued because of clogged collecting devices.

5. Conditions Prior to occurrence:

Unit #1 - 1 of 4 water circulation pu=ps non-operational fres 0717 to 0800 on 4/21/77.

Unic #2 - All water circulation pu=ps operational.

Unic #3 - All water circulation pu=ps operational. ,j

6. Descriotion of Occurrence: ,

During initial operation of the intake screens at Crystal River on April 21, 1977 an unusually large number of Ctenophores accu =ulated in the collecting baskets located at the end of the Unit 1, 2 and 3 sluiceways. This large influx of Ctenophores effectively clogged the collecting baskets and caused an overrun of water and i= pinged i organiscs. Loss of organisms from the sample rendered data yielded by fish and shellfish retained within the basket invalid. Because of this condition sampling for the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period of April 21, 1977 to April 22, 1977 was discontinued. Sampling was, of course, re-j initiated during the week of April 24-30, 1977.

7. Designation of Apoarent Cause of Occurrence:

1 The cause of this event was the unusually large number of Ctenophores 1

accu =ulating, a'nd clogging, the collection baskets.

8. Corrective Action:

, The effective filtering area of the collecting baskets was increased ,

to reduce clogging during future samples.

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