05000302/LER-1980-043-04, /04L-1:on 801001,difference of More than Two Std Deviations Discovered Between Preoperational & Operational Studies in Metabolic Function of Discharge Salt Marshes.Probably Caused by Natural or Seasonal Variations

/04L-1:on 801001,difference of More than Two Std Deviations Discovered Between Preoperational & Operational Studies in Metabolic Function of Discharge Salt Marshes.Probably Caused by Natural or Seasonal Variations

ML19345B874
Person / Time
Site:	Crystal River
Issue date:	11/26/1980
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345B871	List: 05000302/LER-1980-043, Forwards LER 80-043/04L-1 05000302/LER-1980-043-04, /04L-1:on 801001,difference of More than Two Std Deviations Discovered Between Preoperational & Operational Studies in Metabolic Function of Discharge Salt Marshes.Probably Caused by Natural or Seasonal Variations
References
LER-80-043-04L, LER-80-43-4L, NUDOCS 8012020646
Download: ML19345B874 (4)

LER-1980-043, /04L-1:on 801001,difference of More than Two Std Deviations Discovered Between Preoperational & Operational Studies in Metabolic Function of Discharge Salt Marshes.Probably Caused by Natural or Seasonal Variations

Event date:
Report date:
3021980043R04 - NRC Website

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t o,:i 10n 1 October 1930 it was discovered that a difference of more than two (2) stand-t e,2 ! (ard deviations existed between the preop study and the operational study in the Lc.4i Imetabolic function of the discharge salt marshes (spartina and juncus) adjacent i

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This created an event contrary to Environmental Technical Specification p..,i 3.1. 2. Additionally, on two (2) occasions in January and February consecutive i;i7; I bi-weekly samples were taken over 19 days apart.

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A report detailing the results of the study for the first 3-4 years i.isi t is being developed and will be completed within a year. This report should providq i... i t a areater insight into the oriain of these findinas. This revision affects the

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SUPPLEMENTARY INFORMATION

. Report No'.:

50-302/80-043/04L-1 Facility:

Crystal River Unit #3 i

Report Date:

26 November 1980 l

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 be-tween the preop and the operational study in the metabolic function of' the following aquatic systems adjacent to th': CR-3 site:

Discharge salt marshes- (spartina and juncus) 90r. net productivity 4

during the winter and spring quarters of 1980.

The t.e 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 i 20" acceptance criteria with regard to reportability pursuant l

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.

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. Designation of Apparent Cause:

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

The cause of the bi-weekly sample anomaly is attributed to a differ-1 ence of interpretation other than that previously used.

i Analysis.of Occurrence:

In the salt marshes, the possible natural or seasonal variations in conjunction with the possible effect of the Crystal River Unit #3 addition to the site thermal discharge may have caused the change j

- in the metabolic functions observed 'in the operational study, as l'

compared'to the preoperational 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 functions.

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SUPPLEMENTARY INFORMAT;0N Page 2A period of adjustment of the eco-system 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 surveillance sampling has been resolved. Future samples will be taken within the required sur-veillance interval. This revision affects the report date only.

Failure Data:

This is the ninth occurrence of this type reported.

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TABLE 1 Discharge Salt Marsh Metabolism Preop Operational Param2ter Metabolic Function

. Quarter Mean 2e Mean Juncuo Live Weight Winter 1980 475 2i0 1282 Juncus Dead Weight Winter 1980 880 140

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Sparting Live Weight Winter 1980 150 220 485 Spsrting Dead Weight' Winter 1980 335 150 178 1

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 Cross Product Spring 1980 3.18 230 5.525 t

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