IR 05000338/1987008

Forwards Confirmatory Measurement Results as Suppl to Insp Repts 50-338/87-08 & 50-339/87-08 Re Spiked Liquid Samples Sent to Plant on 870511 for Radiochemical Analyses. Comparative Results in Agreement

ML20238E229
Person / Time
Site:	North Anna
Issue date:	09/04/1987
From:	Dan Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
References
NUDOCS 8709140222
Download: ML20238E229 (5)

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"FP 0 41987 L

Virginia Electric and Power Company  ;

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ATTN: Mr. W. L. Stewart, Vice President, Nuclear Operations P. O. Box 26666 Richmond, VA 23261 l

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Gentlemen: l SUBJECT: CONFIRMATORY MEASUREMENT RESULTS, SUPPLEMENT TO INSPECTION REPORT NOS. 50-338/87-08 AND 50-339/87-08 As part of the NRC Confirmatory Measurements Program, spiked liquid samples l were sent on May 11, 1987, to your North Anna facility for selecte '

radiochemical analyse We are in receipt of your analytical results transmitted to us by your letter dated July 10, 1987, and the following-comparison of your results to the known values are presented in Enclosure 1 for your informatio The acceptance criteria for the comparisons are listed in j

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Enclosure 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 ar,y i significant trends in the data among successive years in which samples have been analyzed by your facilit These results and any results from previous years pertaining to these analyses will be discussed at future NRC inspection

Sincerely, c~'r'u At MGNm ?Y r DOU T /,5 M. CC ES l Douglas M. Collins, Chief Emergency Preparedness and Radiological Protection Branch Division of Radiation Safety and Safeguards Enclosures: Confirmatory Measurement Comparisons Criteria for Comparing Analytical Measurements cc w/encis: (See page 2)

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NRC Resident Inspector ,

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. vs Criteria for Comparing Analytical Measurements d'

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Thisenclosureprovidescriteriaforcc5paringresultsofcapabilitytestsadd'

verification measurements. The criteria are based on an empirical relationship which combines prior experience and the accuracy needs of this program. gl

" In this criteria, the judgement limits. denoting . agreement or disagreement between licensee and NRC results are. variable. This variability is a functio 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 range. of acceptable differences between' the NRC and licensee values should be more restrictive. Conversely,. poorer agreement 4 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 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 outs.ide of the agreement ratios are considered in disagreemen Resolution = NRC Reference Value Associated Uncertainty for the Value 2 Comparison Ratio = Licensee Value NRC Reference Value TABLE 1

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Confirmatory Measurements Acceptance Criteria q Resolutions vs. Comparison Ratio )

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< 4 .4 - .5 - .6 - 1.66 16 - 50 .75 - 1.33 51 - 200 .80 - 1.25

>200 .85 - 1.18

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