ML20151Z309

Suppl to Insp Repts 50-321/87-25 & 50-366/87-25,consisting of Results of Measurements of Split Water Samples & Criteria for Comparing Analytical Measurements

ML20151Z309
Person / Time
Site:	Hatch
Issue date:	04/28/1988
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
Shared Package
ML20151X136	List: ML20151X131 ML20151Z309
References
50-321-87-25, 50-366-87-25, NUDOCS 8805050245
Download: ML20151Z309 (2)

See also: IR 05000321/1987025

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ENCLOSURE 1

COMPARISON Of MEASUREMENTS

H-3. pCi/l Ratio

Licensee NRQ Resolu(i_on

i f licensgg/NRQ,} Qomparison

} ample ID

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231 4140 230 18 0.93 Agreement

SN 13$0 (T-2, 81R2365) 3840

5640 t 240 24 0.94 Ag reement

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SN 1351 (T-3, 87R2366) 5280 1 248

< 350 - - Not Compared

SN 1352 ( T-4, 87R2358) < 300

51 1353 ( T-8, 87P2259) 1190 1 196 1070 1 210 5 1.11 Ag reement

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$1 1354 (T-12, 87R2360) 121000 1 1720 115000 1 600 191 1.05 Ag reement

4670 1 241 2620 1 230 11 1.78 Di sag reement

SN 13$5 (T *3, 87R2362)

1060 t 210 5 1.02 Ag reemen t

SN 1356 (1-16, 8782361) 1080 f 194

3480 230 15 1.21 Agreement

SN 1357 (NTA, 81R2363) 4220 2 235

< 350 - - Not Compared

S3 1358 (P15A, STR2356) -99.6 1 177

15I00 2 300 52 0.91 Ag reement

l SN 1359 ( P158, 87R2364) 14300 t 335

< 350 - - Not Compa red

53 1360 ( P11A, 87R2357) < 300

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ENCLOSURE 2

Criteria for Comparing Analytical Measurements

This enclosure provides criteria for comparing results of capability tests and

verification measurenients. The criteria are based on an empirical relationship

which combines prior experience and the accuracy needs of this program.

In these criteria, the judgement limits denoting agreement or disagreement

between licensee and NRC results are viable. This variability is a function of

the NRC's value relative to its associated uncertainty, referred to in this

program as "Resolution"* 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 ratio of the licensee value to the NRC value for

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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 the Table below. Values

outside of the agreement ratios for a selected nuclide are considered in

disagreement.

2 Resolution = NRC Reference Value for a Particular Nuclide

Associated Uncertainty for the Value

"Comparison Ratio = Licensee Value

N5C Reference Value

TABLE

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.R5,

>200 0.85 - 1.18