IR 05000416/1987004

Forwards Confirmatory Measurement Results for Spiked Liquid Samples Sent to Util on 870511 for Selected Radiochemical Analyses,Supplementing Insp Rept 50-416/87-04.Comparative Results in Agreement.Acceptance Criteria Encl

ML20238E101
Person / Time
Site:	Grand Gulf
Issue date:	09/04/1987
From:	Dan Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	Kingsley O SYSTEM ENERGY RESOURCES, INC.
References
NUDOCS 8709140139
Download: ML20238E101 (4)

Text

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l System Energy Resources, In !

ATTN: Mr. O. D. Kingsley, J I Vice President, Nuclear Operations l P. O. Box 23054 Jackson, MS 39205 l j Gentlemen:

SUBJECT: CONFIRMATORY MEASUREMENT RESULTS, SUPPLEMENT TO INSPECTION l l REPORT NOS. 50-416/87-04 As part of the NRC Confirmatory Measurements Program, spiked liquid samples were sent on May 11, 1987, to your Grand Gulf- facility for selected radiochemical analyse We are in ' receipt of your analytical results transmitted to us by your letter dated July 13, 1987, and subsequent to verification of your values as per our conversation by telephone on September 2,1987, the following comparison 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 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, OPWNAL SIGNED BY DOUGLAS M. COUINS l Douglas M. Collins, Chief Emergency Preparedness and

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l Radiological Protection Branch l Division of Radiation Safety and Safeguards Enclosures: Confirmatory Measurement Comparisons Criteria for Comparing Analytical Measurements cc w/encls: (See page 2)

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8709140139 B70904 gDR ADOCK05%{6 I I IroG

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System Energy Resources, In cc w/encls:

T. H. Cloninger, Vice President, Nuclear Engineering and Support J. E. Cross, EdNS Site Director C. R. Hutchinson, GGNS General Manager J. G. Cesare, Director, Nuclear Licensing and Safety R. T. Lally, Manager of Quality Assurance Middle South Services, In R. B. McGehee, Esquire Wise, Carter, Child, Steen and Caraway N. S. Reynolds, Esquire Bishop, Libernan, Cook, Purcell

& Reynolds R. W. Jackson, Project Engineer bec w/encls:

NRC Resident Inspector L. Kintner, NRR Document Control Desk State of Mississippi l

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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 empirical relationship which combines prior experience and the accuracy needs of this progra In this criteria, the judgement limits denoting agreement or disagreement ~

l between licensee and NRC results are variable. This variability is a function

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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 restrictiv Conversely, poorer agree' ment between NRC and licensee values must be considered acceptable as the r.esolution decrease [i 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 outside of the agreement -ratios are considered in disagreemen Resolution = NRC Reference Value-Associated Uncertainty for the Value

'8 Comparison Ratio = Licensee Value NRC Reference Value TABLE 1 Confirmatory Measurements Acceptance Criteria Resolutions vs. Comparison Ratio Comparison Ratio for Resolution Agreement l

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< 4 .4 - .5 - .6 - 1,66 16 - 50 .75 - 1.33 51 - 200 .80 - 1.25

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