ML20030A545

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Forwards NRC Present Confirmatory Measurements Program for Update & Evaluation of Plant Performance.Ie Conducts Tests of Util Radioactivity Measurements,Comparing Samples to NRC Ref Lab
ML20030A545
Person / Time
Site: Big Rock Point, Palisades  File:Consumers Energy icon.png
Issue date: 09/01/1976
From: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To: Dewitt R
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8101090977
Download: ML20030A545 (8)
v • d • e


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'ENTRAi. FILES u"'e s = S NUCLEAR REGULATORY COMMISSION REGloNlil 799 ROOSEVELT ROAD GLEN ELLYN, ILLINOIS 60137 EEP 1 1Eu c

Consumers Power Company Docket No. 50-155 ATIN:

Mr. R. B. DeWitt Docket No. 50-255 Manager of Nuclear Plant Operations 212 West Michigan Avenue Jackson, Michigan 49201 Gentlemen:

j As you are aware, the NRC conducts a nationwide Confirmatory l

Measuremnts Program at r.uclear power facilities. This program consists of tests of licensee measurements'of radioactivity in actual or simulated plant effluent samples, comparing the licensee's measurements to those of our NRC reference laboratory.

The measurements made by the NRC reference laboratory are trace-able to the National Bureau of Standards' Radioactivity Measure--

monts System by laboratory intercomparisons.

T.se, NRC's Office of Inspectiori and Enforcement has been conducting t'se confirmatory measurements program with nuclear power far.ilities rince 1973. In the past, inspectors have discussed changes in the program with your staff during the course of their confirmatory measurements inspections. In order to update your information and assist you in evaluating your facility's performance, we have

  1. prepared the enclosed re. view of our present Confirmatory Measurements Program.

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Consumers Power Company We consider acceptable results in this program to be of significant importance, and request your continued cooperation. We will gladly discuss any questions concerning this matter.

Sincerely yours, James G. Kappler Regional director

Enclosure:

Confirmatory Measurements Program cc w/ enc 1:

Mr. C. J. Hartman Plant Superintendent Mr. J. G. hvis Plant Superintendent bec w/ encl:

gentralFiles IE Files PDR Local PDR Ronald Callen, Michigan Public Service Commission Myron M. Cherry, Chicago Anthony Roisman, Esq.,

Attorney

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,CONFIPJ1& TORY MEASUR121ENTS '!ROGRAM 4

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_Introdtiet f o_n_

The following 'information' has been compiled for the information of

. licensees in NRC Region III to assist in developing a more uniform basis of laboratory comparisons in the conduct of the NRC Confirm-atory Measurements Program.

II.

NRC Reference L1horntory Analysis -

The following counting times and instrumentation are generally used.

3 by the-NRC Reference Laboratory:

}fedia Analysis Instrumentation Count Time

  • j' Liquid Gross Beta Proportional 20 minutes H-3 Liquid scintillation 10 minutes 4

Sr-90, total Sr Proportional 20 minutes Gamma Spec GeLi 60 minutes i

f Gas Gamma Spec GeLi 60 minu' s i;

Particulate Gamma Spec GeLi 60 mint es' 2

filter

.l Charcoal Gamma Spec GeLi 60 minutes Adsorber

  • or 20,000 counts.

III. Limits for Detectability i

The reported NRC reference laboratory results are reviewed to deter-mine if the results are above specific limits for detectability (ID).

Values below the LD are not used for comparison purposes.

These ?,D i

values are as follows:'

1 1.

Liquid and Gas

+.

Specific radionuclide concentrations of 10% of their MPC in 10 CFR 20 Table II, Column B, of more restrictive value of soluble or insoluble limit.

-2.

Particulate Filter and Charcaal Adsorber Specific radionuclide activity present on filter (pC1/ sample) at the following levels:

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Irotope LD Isotope

'LD

~4

-5 Cr-51 1

x 10 Mo-99 5 x 10

-5

-5 Mn-54

-1.5 x 10 I-131 2 x 10 5 x10[5 2x10[5 Cs-134 Co 2 Co-58 1.5 x 10 s-137 2 x 10

-5

-5 Co-60 3

x 10 Ba-140 2 x 10

-5

-5

.Fe-59 3

x 10

- 0 4 x 10

-5

-5

-Zn-65 3

x 10 c-1 x 10_4

-5

' Sr-89 1

x 10 cc-144 1 x 10

-6

-5 Sr-90 2

x 10 ZrNb-95 4 x 10 IV.

Decay Correction NRC reference laboratory samples are counted approximately ten (10) days from sample collection.

Gross beta analysis is performed by both licensee and NRC reference laboratory on liquid samples at a pre-specified date approximately three (3) weeks from sampic collection.

Gas samples should be retained by licensees for recounting two (2)

'to six (6) days after sample collection.

Experience has shown that Xe-135 will mask Xe-133m and Kr-85 identification and quantification.

'La 14C is presently not decay corrected to time of sampling by the NRC reference laboratory.

Comparisons with La-140 are presently made for information purposes only.

V.

Acceptance Criteria

" Criteria for Comparing Analytical Measurements" is l

utilized to determine whether results n'c in the agreement, dis-agreement, possible agreement, or no comparison category. For all NRC reference laboratory results above the LD, comparisons which are in ' agreement' or 'possible agreement' are considered accept-abic, while ' disagreement' or 'not reported b-licensee' are con-sidered unacceptable.

VI.

Report"ng of Results Results from the licensee's analytical measurements are to be received by NRC IE:III within 45 days of sample collection.

VII. Reports Information on the NRC reference laboratory's and licensce's results are analyzed by the NRC Coraputer Data Analysis System., The com-plcted report, example in Table I, is submitted to the licensee by l

the inspector during the exit interview of the Confirmatory Measure-ments Inspection. -

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As seen in Table I, result s are provided for each nample by isotope.

The respective parameters are:

1, NRC reference laboratory result and error (uncertatity).

2.

Licensee result and error (uncertainty).

3.

NRC and-Licensee results and errors are reported in units of:

1:Ci/cc for gas samples 1C1/ml for liquid sampics pCi/ sample for particulate filters and charcoal adsorbers 4.

Z Value This parameter was utilized 'n 1973 as part of the statistical comparison test criteria. The Z value is included for those licensees desiring additional statistical information about the reported values.

2' Z value = (X - X )/(

+ U" ).

g 2

2 w;.e. a X = NRC value g

X = Licensee v,1ue 2

o = NRC error g

0 = Licensee error 2

5.

PCT The percentage parameter was utilized in 1973 as part of the statistical comparison test criteria.

Percentage (PCT) is included for those licensecs desiring additional statistical information.

PCT = (100) (X - X }/X g

2 1

6.

RAT The ratio (RAT) is defined in Attachment I as:

RAT = X /X 2

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RES s

The resolution (RE9 is defined in Attachment I as:

RES = X /c g

g

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T The test result (T) is defined in Tabic 1 as:

A = Agreement P = Possible Agreement N = No Comparison D = Disagreement Attachments:

1. Attachment 1, Criteria for Comparing Analytical Measurements
2. Table 1, Confirmatory Measurements Program S /

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f, ATTACll!1ENT )

CRITERIA FOR COMPARING ANALYTICAL MEASilREllENTS

w This attachment provides criteria ' for compar.ing results of capability tests and verification measurements. The criteria are based on an

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

In these criteria, the judgment limits are variable in relation to the 4

comparison of the NRC Reference Laboratory's value to its associated one sigma uncertainty. As that ratio, referred to in this program as 4

" Resolution", increases, the acceptability of a licensce's measurement should be core selective. Conversely, poorer agreement should be con-sidered acceptable as the-resolution decreases.

The values in the ratio criteria may be rounded to fewer significant figures to maintain statistical consistency with the number of significant figurer reported by the NRC Reference Laboratory, uniera such rounding will renult in a narrowed category of acceptance.

The acceptance category reported will be the narrowest into which the ratio fits for the resolution being used.

RESOLUTION RATIO = LICENSEE VALUE/NkC REFERENCE VALUE Possible Possible Agreement

' Agreement "A" Agreement "B"

<3 No Comparison ik> Comparison No Comparison 13 and <4 0.4 - 2.5 0.3 -

3.0 No Comparison 3

14 and <8 0.5 -

4.0 0.4

- 2.5 0.3 -

3.0 18 and <16 0.6 - 1.67 0.5 -

2.0 0.4

- 2.5 j

116 and <50 0.75 - 1.33 0.6 - 1.67 0.5

- 2.0 150 and <200 0.80 - 1.25 0.75 - 1.33 0.6 - 1.67 l

1200 0.85 - 1.18 0.80 -

1.25 0.75 - 1.33 "A" criteria are applied to the following analyses:

Gamma spectrometry, where principal gamma energy used for identifi-cation is greater than 250 kev.

Trit'ium analyses of liquid samples.

"B" criteria are applied to the following analyses:

Gamma spectrometry, where principal gamma energy used for identifi-cation is less than 250 kev.

3 Sr-89 and Sr-90 determinations.

Gross beta, where sampics are counted on the same date using the same reference nuclide.

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