ML20137T005
| ML20137T005 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 02/11/1986 |
| From: | Walker R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Woody C FLORIDA POWER & LIGHT CO. |
| References | |
| NUDOCS 8602180161 | |
| Download: ML20137T005 (4) | |
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<pn FEB 111986-F.lorida Power and Light Company vATTN: Mr. C. 0. Woody Group Vice President Nuclear Energy Department
-P. O. Box 14000
. Juno Beach, FL 33408 Gentlemen:
SUBJECT:
. CONFIRMATORY MEASUREMENTS RESULTS DOCKET NOS. 50-335 AND 50-389 As part of the NRC Confirmatory Measurements Program, spiked 1.iquid samples were sent on July 22, 1985, to your St. Lucie facility for selected radiochemical analyses. We are in receipt of your analytical results transmitted to us by your letters dated September 27, 1985, and January 10, 1986.
Results were verified based on a telephone conversation on February 5, 1986.
Comparison of your results to the known values are presented in Enclosure 1 for your information.
The acceptance criteria for the comparisons are listed in Enclosure 2.
In our review of the data, comparative results were in agreement for H-3, Sr-89, and Sr-90 analyses and disagreement -for Fe-55.
This disagreement may be indicative of a programmatic weakness and therefore your attention is directed to determining the underlying cause for this disagreement.
Furthermore, all data should be reviewed in greater detail by cognizant staff members for significant trends in the data among successive analyses.
i These results and any results from previous years pertaining to these analyses will be discussed at future.NRC inspections.
Sincerely,
rYd.Shi 1Eb.
N ' # O. 8v'CL//fi/f g 2180 g $M211:33 5 p
Roger D. Walker, Director Division of Reactor Projects
Enclosures:
1.
Confirmatory Measurement Comparisons 2.
Criteria for Comparing Analytical Measurements cy w/ encl:
W. N. Harris, Vice President St. Lucie Nuclear Plant TAT. A. Sager, Plant Manager
- g. Weems, Site QA Superintendent bec w/ enc 1:
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Florida Power and Light Company 2
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$ C Resident Inspector Document Control Desk State of Florida i
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y-f_P(CLOSURE 1 CONFIRMATORY MEASUREMENT COMPARISONS OF H-3, FE-55, SR-89, AND'SR-90 ANALYSIS FOR ST. LUCIE NUCLEAR PLANT ON SEPTEMBER 27, 1985 N
isotope Licensee
-NRC Resolution Ratio Compa ri son (uCi/ unit)
(uCi/ unit)
(Licensee /NRC)
H-3 4.00 E-5 3.1110.06 E-5 52 1.29 Di sag reement 11-3 ( reana lysis)*
3.06 E-5 3.1110.06 E-5 52 0.98--
. Ag reement Fe-55 2.94 E-5 1.0910.02 E-5 55-2.70-Di sag reement Sr-89 1.43 E-4 1.3110.04 E-4 33.
1.09 Ag reemen t S r-90 1.73 E-5 1.4410.06 E-5 24 1.20 Agreement'
- Second - tritium analy? :s result transmitted by letter dated Janua ry 10, 1986. Licensee stated that cause of the first tritium result discrepancy could not be identified.
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ENCLOSURE 2 CRITERIA FOR COMPARING ANALYTICAL MEASUREMENTS This enclosure provides criteria for' comparing.results of capability tests and
- verification measurements. The criteria are based on an empirical relationship
~
which combines prior experience and the accuracy needs of this program.
In-this~ criteria, the judgement limits denoting agreement or disagreement _between
-licensee and NRC results are variable. This variability is a function of the NRC's value relative to its associated uncertainty. As the ratio of the NRC value to its associated uncertainty, referred to in this program as " Resolution"2 increases, the range of acceptable differences.between the NRC and licensee values should be more restrictive. Conversely, poorer agreement between NRC.and licensee values must be considered acceptable as the resolution decreases.
For comparison purposes, a ratio of the licensee value to the NRC value for each 2
individual nuclide is computed. This ratio is then evaluated for agreement based on the calculated resolution. The corresponding resolution and calculated. ratios which denote agreement' are listed in Table 1 below.
Values outside of the agreement ratios for a selected nuclides are considered in disagreement.
NRC Reference Value for a Particular Nuclide 2' Resolution = Associated Uncertainty for the Value
-Licensee Value Comparison Ratio'= NRC Reference Value 2
TABLE 1 - Confirmatory Measurements Acceptance Criteria Resolutions vs. Comparison Ratio Comparison Ratio for i
Resolution-Agreement
<4 0.4. - 2.5 4-7 0.5. - 2.0 8 0.6 - 1.66 16 - 50 0.75
~1.33 51 - 200 0.80 - 1.25
>200 0.85 - 1.18 e
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