IR 05000338/1988009

Forwards Confirmatory Measurement Comparisons & Criteria for Comparing Analytical Measurements,Per Insp Repts 50-338/88-09 & 50-339/88-09

ML20155E694
Person / Time
Site:	North Anna
Issue date:	09/27/1988
From:	Dan Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
References
NUDOCS 8810120376
Download: ML20155E694 (4)

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Virginia Electric and Power Company ATTN: Mr. W. R. Cartwright, Vice President, Nuclear Operations P. O. Box 26666 Richmond, VA 23261 Gentlemen:

SUBJECT: DOCKET N05. 50-338 AND 50-339, CONFIRMATORY MEASUREMENT RESULTS, SUPPLEMENT TO INSPECTION REPORT NOS. 50-338/88-09 AND 50-339/88-09 As part of the NPC Confirmatory Measurements Program, spiked liquid samples were sent on June 2, 1988, to your North Anna facility for selected radiochemical analyse We are in receipt of your analytical results transmitted to us by your letter dated August 8,1988, and the following comparisons 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 In our review of these data shall all comparative results were in agreemen These data should be reviewed in greater detail by cognizant staff members for any significant trends in the data among successive years in which samples have been analyzed by your facility.

t Mr. W. Barnes of your North Anna facility staff, was informally notified of

- these results by telephone conversation on September 20, 198 These results and any results from previous years pertaining to these analyses will be discussed at future NRC inspection Sincerel OriginalSigned By D. M. Collina Douglas M. Collins, Chief Emergency Preparedness and Radiological Protection Branch Division of Radiation Oafety and Safeguards Enclosures

Confirmatory Measurement Comparisons

. Criteria for Comparing Analytical Measurements cc w/encis: (See page 2)

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Virginia Electric and Power Company 2

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G. E. Kane, Station Manager N. E. Hardwick, Manager - Nuclear Programs and Licensing E. Dreyer, Superintendent Health Physics Commonwealth of Virginia

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NRC Resident Inspector DRS Technical Assistant Docuttat Control Desk Rll Ril RI QLbv PStoddart Gh*1K JKdhle g G W Ca trell 9/>s/88 9/p \ /88 9gjb/88

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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 emairical relationship which combines prior experience and the accuracy needs of tiis progra In these criteria the judgement limits denoting agreement or disagreement between licensee a,nd NRC results are variable. This variability is a function ;

of the NRC's value relative to its associated uncertainty, referred to in this program as "Resolution"1 increases, the range of acce) table differences between L the NRC and licensee values should be more restrictive. Conversely, poorer l agrement between NRC and licensee values must be considered acceptable as the resolution decrease For comparison purposes, a ratio 2 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 resolutio The corresponding resolution and calculated ratios which denote agreement are listed in Table 1 below. Values outside of the agreement ratios for a selected nuclide are considered in disagreemen Resolution = NRC Reference Value for a Particular Nuclide Associated Uncertainty for the Value 2 Comparison Ratio = Licensee Value NRC Reference Value TABLE 1 Confirmatory Measurements Acceptance Criteria Resolutions vs. Comparison Ratio Comparisons Ratio for Resolution Agreement

<4 0. 4 - . 5 - . 6 - 1.66 16 - 50 0.75 - 1.33 51 - 200 0.80 - 1.25

>200 0.85 - 1.18 l

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ENCLOSURE 1 CONFIRMATORY MEASticEMENT COMPARIS0NS OF H-3, FE-55, SR-89 AND SR-90 ANALYSES FOR NORTH ANNA NUCLEAR PLANT Licensee NRC Ratio Isotope (uCi/ml) (uCi/ml) Resolution (Licensee /NRC) Comparison H-3 2.39 E-05 2.1010.04 E-05 53 1.14 Agreement Fe-55 2.00 E-05 2.0710.04 E-05 52 0.97 Agreement Sr-89 1.60 E-04 1.5910.05 E-04 32 1.01 Agreement Sr-90 1.00 E-05 9.5510.38 E-06 25 1.05 Agreement

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