IR 05000416/1988027

Forwards Confirmatory Measurement Comparisons of Sr-89 & Sr-90,per Insp Rept 50-416/88-27.All Comparative Results in Agreement

ML20245A326
Person / Time
Site:	Grand Gulf
Issue date:	04/17/1989
From:	Dan Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	Cottle W SYSTEM ENERGY RESOURCES, INC.
References
NUDOCS 8904250146
Download: ML20245A326 (4)

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APR 1 7 1989 System Energy Resources, In ATTN: Mr. W. T. Cottle, Vice President Nuclear' Operations P. O. Box 23054 Jackson, MS 39205 Gentlemen:

SUBJECT: DOCKET NO. 50-416, CONFIRMATORY MEASUREMENT RESULTS, SUPPLEMENT TO NRC INSPECTION REPORT NO. 88-27 i

As part of the NRC Confirmatory Measurements Program, spiked liquid samples 1 were sent on January 9, 1989, to your Grand Gulf f acility for selected {

radiochemical analyse We are in receipt of your analytical results i transmitted to us by your letter dated March 14, 1989 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 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 any 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, Cr44cl4it'XiE7 n.11CoEins Douglas M. Collins, Chief Emergency Preparedness and Radiological Protection Branch Division of Radiation Safety and Safeguards

Enclosures: Confirmatory Measurement Comparisons J Criteria for Comparing ,

Analytical Measurements '

cc w/encls: (See page 2)

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System Energy Resources, In cc w/encis:

T. H. Cloninger, Vice President, Nuclear Engineering and Support C. R. Hutchinson, GGNS General Manager J. G. Cesare, Director, Nuclear Licensing R. T. Lally, Manager of Quality Assurance Middle South Utilities System Services, In R. B. McGehee, Esquire Wise, Carter, Child, Steen and Caraway N. S. Reynolds, Esquire Bishop, Cook, Purcell & Reynolds R. W. Jackson, Project Engineer State of Mississippi bec w/encls:

NRC Resident Inspector L. Kintner, NRR RII RII RII SAdamovitz:tm JKahle FCantrell 4/ /89 4/ /89 4/j7/89

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ENCLOSURE 2

Criteria for Comparing Analytical Measurements This enclosure provides criteria for comparing results of capability tests and i verification measurements. The criteria are based on an empirical relationship which combines prior experience and the accuracy needs of this progra (

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, referred to in this a program as " Resolution"2 As Resolution increases, the range of acceptable differences between the NRC and licensee values should be more restrictiv Conversely, poorer agreement between NRC and licensee values must be considered acceptable as the resolution decrease j For comparison purposes, a ratio 2 of the licensee value to the NRC value for each individual nuclide is compute 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 belo 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 Resolution vs. Comparison Ratio Comparison 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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