ML19242C473

Suppl Info to LER 79-064/04L-0 on 790727:difference of More than Two Std Deviations Discovered Between Preoperational & Operational Study in Metabolic Functions of Aquatic Sys. Caused by Natural or Seasonal Variations

ML19242C473
Person / Time
Site:	Crystal River
Issue date:	08/01/1979
From:	FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19242C469	List: ML19242C468 ML19242C473
References
LER-79-064-04L, LER-79-64-4L, NUDOCS 7908100459
Download: ML19242C473 (3)

Text

- SUPPLEMENTARY INFORMATION

1. Re po rt No . . 50-302/79-064/04L-0

2. Facility: Crystal River Unit No. 3

3. Re po r t Date: August 1, 1979

4. Occurrence Date: Spring quarter of 1979 (discovered 27 July 1979)

(determined at plant 31 July 1979)

5. Identification of Occurrence:

A dif f erence of more than two standard de viations ( > 2 e) e xis t e d be-tween the preope rational s tudy and the ope rat ional s tudy in t he me t a -

bolic functions of the following aquatic systems ad jacent to Crystal Rive r Uni t Nc . 3:

a) Discharge Salt >brshes (Juncus ) f or live biomass , dead biomass ,

net prodtetivity, and gross productivity during the Sp rin g quarter.

6. Conditions Prior to Occurrence :

The site generator capacity factor for the Spring quarter (Jan ua ry ,

February, and March) of 1979 was 54.7%.

7. De sc ript ion of occurrence:

In Table 1 is the description of t he preope rational mean , t he preoper-ational two standard deviation (2a), the operational mean , and the determination whether the operational mean was greater than (>) the preoperational mean plus two standard de viations or less than (<) the preoperational mean minus two standard deviations f or each of the items of Section 5 a bo ve .

8. Designation of Apparent Cause:

The apparent causes of the greater than two standa rd de viation change of the metabolic f unc t ions in the Salt Marshes coald be natural or seasonal variations or these va riat ion s in con junction with the in-creased thermal output from the site d ue to Crystal River Unit No. 3.

9. Analysis of Occurrence :

La the Salt Marshes, the possible natural or seasonal variations in con junction with the possible effect of the Crystal River Unit No. 3 add it ion to the site thermal discharge may have caused the change in the metabolic functions observed in the operational study as compared a n o '

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7908100 1

9. Analysis of Occur' . (Continued) to the preoperational study. However, these changes may be temporary as the ecosystem reorganizes itself to the new conditions. The sug-gestion of cause and ef fece by Crystal River Unit No. 3 can only be curroborated by the continuance of this study since greater than two standard deviation dif ference did not exist between preoperatiot al and the operational data in the remaining metabolic functions.

A period of adjustment of the ecosystem was expected concurrent with Crystal River Unit No. 3's initial operation. Theref ore , changes in the operation of the unit a re not required, and the present program to monitor the environment will be continued.

10. Corrective Action:

The change in metabolic functions in the Discharge Salt Marshes can-not, at this time, be attributed to either natural phenomenon or a specific man-made cause. Therefore, the present study will be contin-ued to verify, if possible, the cause. Until such time, no corrective action can be defined.

11. Failure Data:

This is the fourth report for this type occurrence. Refer to:

78-022/04L-0, dated 31 July 1978.

78-024/04L-0, dated 19 September 1978.

79-021/04L-0, dated 3 April 1979.

79-039/04L-0, dated 1 Stay 1979.

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lrcoperational Operational Operational flean

__ Aquatic System tie t atio l i c l'unc t ion jhiarter tiean 2a _tf ea n >or < Preoperational t!ean 2a Discliarge Salt Live liiomans Spring 515 228 1162 >

tla rslier. (Juncus) (g/m )

Spring 830 150 1086 >

Deatl liigjmas.s (g/m )

Net Produgt ivit y Spring 1.41 1.04 4.565 >

(g C/m -day) 6.813 >

GrossProt}uctivity Spring 1.12 2.30 (g C/m -alay)

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