ML20153C187

Advises That Results of Util 850925 Confirmatory Measurements Program for Spiked Liquid Samples Agree W/Nrc Comparative Results.Result Comparisons to Known Values & Acceptance Criteria for Comparisons Encl

ML20153C187
Person / Time
Site:	Robinson
Issue date:	02/11/1986
From:	Panciera V NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	Utley E CAROLINA POWER & LIGHT CO.
References
NUDOCS 8602180378
Download: ML20153C187 (3)

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FEB 111986 Carolina Power and Light Company MTTN: Mr. E. E. Utley Senior Executive Vice President Power Supply and Engineering and Construction P. O. Box 1551 Raleigh, NC 27602 Gentlemen:

SUBJECT:

CONFIRMATORY MEASUREMENT RESULTS, DOCKET NO. 50-261 As part of the NRC Confirmatory Measurements Program, spiked liquid samples were sent on July 22, 1985, to your Robinson facility for selected radiochemical analyses. We are in receipt of your analytical .results transmitted to us by your letter dated-September 25, 1985. Comparison of your results to the known value are presented in Enclosure 1 for your information. The acceptance criteria for the comparisons are listed in Enclosure 2.

In ' our review of these data all comparative results were in agreement, These data should be reviewed in greater detail by cognizant staff. members for any significant trends in the data among successive analyses. Any biases noted may be indicative of a programmatic weakness and attention should be given to determine reasons for such biases.

These results and any results from previous years pertaining to these analyses will be discussed at future NRC inspections.

Sincerely, Vincent W. Panciera, Chief Reactor Projects Branch 2 Division of Reactor Projects

Enclosures:

1. Confirmatory Meas ~urement Comparisons

2. Criterial for Comparing Analytical Measurements fcw/encls:

G. P. Beatty, Jr. , Manager Robinson Nuclear Project Department

d. E. Morgan, Plant General Manager c w/encls:

RC Resident Inspector Document Contrei Desk State of North Carolina

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f D! CLOSURE 1

' CONFIRMATORY MEASUREMENT COMPARISONS OF H-3, FE-55, SR-89.'AND SR-90 ANALYSIS -

FOR THE ROBINSON NUCLEAR PLANT ON SEPTEMBER 25, 1985 Isotope

• Licensee NRC- Resolution.~

Ratio Compa ri son (uCi/ unit) (uCl/ unit) (Licensee /NRC)

H-3. 1.85 E-5 2.2410.05 E-5 45 0.83 Ag reement Fe-55 ~ 8.10 E-6 7.8410.16 E-6' 49 1.03 ' Ag reement S r-89 1.00 E-4 '9.45f0.28 E-5' 34 1.06 Ag reement S r-90 1.04 E-5 1.0410.04 E-5 26 1.00- Ag reement

1. Average of duplicate results

~

1 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 ratio2 of the licensee value to Lne 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 0.75 - 1.33 51 - 200 0.80 - 1.25

>200 0.85 - 1.18