ML19345B804

LER 80-043/04L-0:on 801001,difference of More than Two Std Deviations Discovered to Exist Between Preoperational & Operational Studies in Metabolic Function of Discharge Salt Marshes.Probable Cause Is Natural or Seasonal Variations

ML19345B804
Person / Time
Site:	Crystal River
Issue date:	10/31/1980
From:	FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345B799	List: ML19345B798 ML19345B804
References
LER-80-043-04L, LER-80-43-4L, NUDOCS 8012020531
Download: ML19345B804 (4)

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the metabolic function of the discharge salt marshes (spartina and juncus) ad- j

[o.l fois!I jacent to CR-3. This created an event contrary to Environmental Technical Specifi$

ga,,jg cation 3.1.2. Additionally, on two (2) occasions in January and February con-secutive bi-weekly samples were taken over 19 days apart.

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i i ,2!J The cause of this event could be attributed to natural or seasonal variations or

, these variations in conjunction with the increased thermal output from the site due to CR-3. A report detailing the results of the study for the first 3-4 years should provida is being developed and will be completed within a year. This report

i. . i3i a greater insight into the origin of these findings.

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Name of Preparer: (900 E M (SII r:N-=n SC ?LII'i'O_?.! MG?liA~ICS S"- -1)

SUPPLD4ENTARY INFORF1ATION Repo/t No.: 50-302/80-043-04L-0

?acility: Crystal River Unit #3 Report Date: 3(30ctober1980 Occurrence Date: Winter and Spring 1980 Discovered: 12 September 1980 (determined at plant 1 October 1980) ,

Identification of Occurrence:

A difference of more than two (2) standard deviations existed between the preop and the operational study in the metabolic function of the following aquatic systems adjacent to the CR-3 site:

Discharge salt marshes (spartina and juncus) for net productivity during the winter and spring quarters of 1980.

The time interval between "bi-weekly" oxygen samples exceeded nineteen (19) days.

Conditions Prior to Occurrence: N/A Description of Occurrence:

The data provided in Table 1 was outside the "preoperational mean

+ 20" acceptance criteria with regard to reportability pursuant to Environmental Technical Specification 3.1.2.

In addition, it was discovered that samples taken during the sample periods, January 4-6, 1980 and February 22-24, 1980, began greater than 19 days after the previous sample period.

Designation of Apparent Cause:

The apparent cause of the greater than two standard deviation change of the metabolic function in the salt marshes could be natural or seasonal variations or these variations in conjunction with the in-creased thermal output from the site due to Crystal River #3.

The cause of the bi-weekly sample anomaly is attributed to a differ-ence of interpretation other than that previously used.

Analysis of Occurrence:

In the salt marshes, the possible natural or seasonal variations in conjunction with the possible ef fect of the Crystal River Unit #3 addition to the site thermal discharge may have caused the change in the metabolic functions observed in the operational study as com-pared to the pre-operational study. However, these changes may be temporary as the eco-system reorganizes itself to the new conditions.

The suggestion of cause and effect by Crystal River Unit #3 can only be corroborated by the continuance of this study, since a greater than two standard deviation difference did not exist between pre-operational and the operational data in the remaining metabolic func-tions.

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. SUPPLEMENTARY INFORMATION Page 2 f

Analysis of Occurrence (continued)

A period of adjustment of the ecosystem was expected concurrent with Crystal River Unit #3's initial operation. Therefore, changes in the operation of the unit are not required, and the present program to monitor the environment will be continued.

Corrective Action:

The change in metabolic functions in the discharge salt marshes cannot, at this time, be attributed to either natural phenomenon or a specific man-made cause. Therefore, the present study will be continued to verify, if possible, the cause. Until such time, no corrective action can be defined.

The difference of interpretation in survoillance sampling has been resolved. Future samples will be taken sithin the required sur-veillance interval.

Failure Data:

This is the ninth occurrence of this type reported.

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TABLE 1 Discharge Salt Marsh Metabolism .

Preop Operational .

Parameter  !!etabolic Function Quarter Mean 2 a- Mean ,

Juncus Live Weight Winter 1980 475 210 1282 Juncus Dead. Weight Winter 1980 880 140 1291 Sparting Live Weight Winter 1980 150 220 485 4 Sparting Dead Weight Winter 1980 335 150 178 Juncus Live Weight Spring 1980 515 228 1099 Juncus Dead Weight Spring 1980 830 150 1433 Juncus Net Product Spring 1980 2.4 1.86 9.247 Juncus Gross Product Spring 1980 4.62 1.82 12.33 Sparting Net Product Spring 1980 1.41 1.04 3.378 Sparting Gross Product Spring 1980 3.18 230 5.525 l

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