IR 05000287/1987029

Ack Receipt of 880107 Submittal of Analytical Results of Spiked Liquid Samples,Per Insp Repts 50-413/87-29 & 50-287/87-29.Comparison of Results to Known Values & Acceptance Criteria for Comparison Encl

ML20149M264
Person / Time
Site:	Oconee, Catawba
Issue date:	02/19/1988
From:	Dan Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	Tucker H DUKE POWER CO.
References
NUDOCS 8802250444
Download: ML20149M264 (4)

Text

_

.

L'fl'L6w!'

FEB 191988 Duke Power Company ATTN: Mr. H. B. Tucker, Vice President Nuclear Production Department 422 South Church Street Charlotte, NC 28242 Gentlemen:

SUBJECT: DOCKET NOS. 50-413 AND 50-414, CONFIRMATORY MEASUREMENT RESULTS, SUPPLEMENT TO INSPECTION REPORT NOS. 50-413/87-29 AND 50-287/87-29 As part of the NRC Confirmatory Measurements Program, spiked liquid samples were sent on November 5, 1987, to your Catawba facility for selected radiochemical analyse We are in receipt of your analytical results transmitted to us by your letter dated January 7, 1988, and subsequent to verification of your values as per our conversation by telephone on February 12, 1988, 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 l In our review of these data all comparative results were in agreement. These data should be reviewed in greater detail by your 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, ORIGINAL SIGNED BY DOUGLAS M CnN ' kit Douglas M. Collins, Chief Emergency Preparedness and Radiological Protection Branch Division of Radiation Safety '

and Safeguards Enclosures:

1. Confirmatory Measurement Comparisons Criteria for Comparing Analytical Measurements I

cc w/encis:

J. W. Hampton, Station Manager

BDOR29 h EE& & 0500o413 o

PDR

'

'\\

- . --- . . _ . . . . - . , . . , , - . . - - , - - ._ , . _ _ . _ _ , - , .,,. - , , - . - . . . . - - . - .

re. +

r

.

Duke Power Coupany 2 bec w/encls:

NRC Resident Inspector DRS Technical Assistant K. N. Jabbour, NRR State of South Carolina Document Control Desk RII RII RI b rseu J !h e eebles 2/ /88 f)/88 2//8f88 i

l

.

+

ENCLOSURE 1 Confi rmatory Measurement Compa risons or H-3, Te-55, and Sr-90 Analyses for Catawba Nuclea r Plant, November 5, 1987 Licensee NRC Ratio isotope toci/mi) fuci/ mil Resolution fLicensee/NRC) Compa ri Son H-3 3.13 E-5 3.27 1 0.07 E-5 47 0.96 Ag reemen t Fe-55  ?.19 E-5 2.00 1 0. 0 f4 E-5 50 1.10 Ag reement Sr-90 3.10 E-6 4.05 1 0.16 E-6 25 0.76 Ag reement Note: Due to the extended decay time for the isotope Sr-89, the analytical results were not compa red.

. _ _ _ _ _ - _ _ _ _ _ _ - _ _ _ _ - _ _ _ _ _ _ _ _ _ _ - _ _ _ _ - _ _ - _ - - - - _ _ - _

. ._ .

.

'

.

.

k 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 between licensee and NRC results are variable. This variability is a function of the NRC's value relative to its associated uncertainty. As the ratio of tha NRC value to its associated uncertainty, referred to in this program as

"Resolution"5 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 decrease For comparison purposes, a ratio8 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 below. Values outside of the agreement ratios for a selected nuclide are considered in ,

disagreemen NRC Reference Value for a Particular Nuclide

Resolution = Associated Uncertainty for the Value  !

Licensee Value

] " Comparison Ratio = NRC Reference Value ,

!

-

l TABLE 1  !

Confirmatory Measurements Acceptance Criteria Resolutions vs. Comparison Ratio

"

Comparison Ratio for Resolution Agreement l < 4 0.4 - .5 - l 8- 15 0.6 - 1.66 l 16 - 0 0.75 - 1.33 51 - 200 0.80 - 1.25

>200 0.85 - 1.18

.

- - . .-. - - , . , - . , - - - - - - - - - . , - , . . , - , , . , . , . , . ---w- , . , - ~ - ,=