ML20151X033
| ML20151X033 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 01/15/1986 |
| From: | Walker R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Wilgus W FLORIDA POWER CORP. |
| References | |
| NUDOCS 8602120268 | |
| Download: ML20151X033 (4) | |
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JAN 15 m Florida Power Corporation vATTN:
'Mr. W. S. Wilgus Vice President Nuclear Operations P. O. Box 14042, M.A.C. H-2 St. Petersburg, FL 33733 Gentlemen:
SUBJECT:
CONFIRMATORY MEASUREMENTS RESULTS DOCKET NO. 50-302 As part of the NRC Confirmatory Measurements Program, spiked liquid samples were
.sent on July 22, 1985, to your facility for selected radiochemical analyses. We are in receipt of your analytical results transmitted to us by your letter dated September 9,1985, and as supplemented by your letter of November 26, 1985. A comparison of your results to the known values are presented in Enclosure 2 for your information.
The acceptance criteria for the comparisons are listed in.
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, consideration should be given to review of these results and past confirmatory measurement results for significant bias and trends.
These results and any results from previous years pertaining to these analyses will be discussed at future NRC inspections.
Sincerely, Roger D. Walker, Director Division of Reactor Projects
Enclosures:
1.
Criteria for Comparing Analytical Measurements 2.
Confirmatory Measurement Comparisons cc w/encls:
vE. M. Howard, Director Site Nuclear Operations
. W._F. McKee, Nuclear Plant Manager
- G. R. Westafer, Manager Nuclear Operations Licensing and Fuel Management bcc'w/encis:
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ENCLOSURE 1
' 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 ' these 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"1 increases, the rarige 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.
2 For comparison purposes, a ratio of the licensee value to the NRC value for each 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 2 Comparison Ratio = NRC Reference Value TABLE 1 - Confirmatory Measurements Acceptance Criteria Resolutions vs. Comparison Ratio Comparison Ratio for Resolution Agreement
<4 0.4. - 2.5 4-7 0.5. - 2.0 8 - 15 0.6 - 1.66 16 - 50' O.75 - 1.33 51 - 200 0.80 - 1.25
>200 0.85 - 1.18
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ENCLOSURE 2 CONFlRMATORY MEASUREMENT C'OMPARISONS OF H-3, FE-$5, SR-89, AND SR-9O ANAL'YSIS-
.FOR CRYSTAL RIVER NUCLEAR.. PLANT IN JULY 1985 Isotope
- Licensee NRC Resolution Ratio' Compa ri son (uCi/ unit)
(uCi/ unit)-
(Licensee /NRC)
.H-3 3.4610.34 E-5 3.3210.07 E-5 47 1.04
. Ag reement '
re-55 8.4710.08 E-6 1.1610.02 E-5 58 0.73 Di sag reement Sr-87 1.1810.06 E-4 1.4010.04 E-4 35 0.84
~ Agreement Sr-90 1.5610.03 E-5 1.5410.06 E-5 26 1.01 Ag reement,l
- Average of duplicate results 1
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