ML20003A187

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Forwards Summary of NRC Review of Util Confirmatory Measurements Results.Radionuclide Concentrations in Effluents May Be Underestimated.Requests Info within 20 Days Re Steps Taken to Improve Effluent Radioanalyses Accuracy
ML20003A187
Person / Time
Site: Big Rock Point File:Consumers Energy icon.png
Issue date: 01/10/1977
From: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To: Dewitt R
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8101300819
Download: ML20003A187 (5)
v • d • e


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, UNITED STATts t

NUCLEAR REGULATORY COMMISSION REGION lit 799 ROOSEVELT RO AD CLLN ELLYN, ILLINOIS 60137 JANigf9R Consumers Power Company Docket No. 50-155 ATTN:

Mr. R. B. DeWitt Manager of Nuclear Plant Operations 212 West Michigan Avenue Jackson, Michigan 49201 Centlemen:

As discussed in my letter of September 1, 1976, the NRC has conducted the Confimatory Measurements Program with the operating nuclear power facilities in Recion III since 1973. My staff has completed a review of your Confima: ry Measurements results at the Big Rock Point Nuclear Power Plant fron ;974 through September 15, 1976. Please find enclosed a summary of your performance history. This infomation is provided to assist you in assessing your program for identification and quantification of radionuclides in effluents.

Your Confirmatory Measurements results to date show a substantial number of unacceptabic comparisons. Based on these comparisons it is indicative that you may be underestimating radionuclide concentrations in effluents.

While this has not led to exceeding your Technical Specifications, the potential for doing so exists. Picase advise this office within twenty (20) days of this letter of the steps you have taken to improve the accuracy of your effluent radioanalyses.

Enclosures to this letter are: Tabic 1, Figure 1 and Confirmatory Measurements Program Perfomance llistory for Big Rock Point Nuclear Power Plant which includes the key for symbols used in Tabic 1.

We appreciate your continued cooperation and will gladly discuss any questions regarding this matter.

Sincerely yours, James G. Keppler Regional Director

Enclosures:

cc w/encls; PDR As Stated Mr. C. J. Hartman, Local PDR Plant Euperintendent NSIC

@40tuiso,$.

Central Files TIC

(%.;

Reproduction Unit NRC 20b Ronald Callen, Michigan 9

N 6'p Anthony Rosiman, Esq.,

Public Service Commission I'

f Attorney iff3,gg@ '

d _C Ms./}. y T-~

i 7/0/S6M/7

(-

TABLE.1 COMPUTER DATA ANALYSIS SYSTEM Facility:

Big Rock Point Number of Inspections: 5 Humber of Comparisons:

106 Analyze.Results:

U LLD' A

P D-N No.

Pc t -

No.

Pct No.

Pct No.

Pct No.

Pct' No.

Pct 26 24.5 16 15.1 28 26.4 4

3.8 23 21.7 9

8.5 Invalidated Samples:

The following sample comparisons were not considered for Acceptabic/

Unacceptab a calculations:

Xel33m

.4U (gas)

K40 1U (charcoal adsorber)

Co60 l'U (charcoal aJsorber)

Cs134 IU, IA (charcoal adsorber)

Cs137 1A, 2U (charcoal adsorber)

.I Bal40 2U (charcoal adsorber)

Lal40 1D (liquid)

La140 2U (particulate filter)

La140 2U (charcoal adsorber)

IU (particulate filter)

Beta Number / Percent Acceptable:

30/48.4%

Number / Percent Unacceptabic: 32/5'1.6%

Unacceptable Comparisons:

Liquid Sr89 (1 of 3), Sr90 (2 of 4), Beta (2 of l-),113 (3 of 3), Fe59 (1 of 1), CoS8 (1 of 1), Co60 (2 of 5), 2n65 (3 of 5), Sb124 (1 of 1), Cs134 (3 of 5), Cs137 (3 of 5), Bal40 (1 of 1)

Gas Xel33 (2 of 4)

P Filter Cs134 (2 of 3), Cs137 (1 of 4), Bal40 (1 of 1)

C Filter 1131 (2 of 5)

Sr90 (1 of 1)

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CONFIRMATORY MEASUREMENTS PROGRAM PERF'ORMANCE IllSTORY FOR BIG ROCK POINT NUCLEAR PLANT I.

Introduction The following information has been compiled for the information of licensees in NRC Region III to assist in developing their laboratory capobility in the NRC Confirmatory Measurements Program. Data utilized in the analyses have been discussed in the following IE Inspection Reports:

050-155/76-20 050-155/76-06 050-155/75-01 050-155/74-07 Additional results reported by the licensee to the NRC have been incorporated into the evaluation analyses.

II.

Confirmatory Measurements Program A description of all parameters and criteria utilized in the

~ Confirmatory Measurements Program is precented in the attach-ment " Confirmatory Measurements Program," to the letter from Mr. J. G. Keppler, Director, USNRC, Region III, to Consumers Power Company dated September 1, 1976.

In addition, the following definitions are utilized in the performance history evaluation:

Unreported (U) results reported for radicauclides by llSL which were above the LD requirements, but the liccnsee did not report the radionuclide as being present in the sample.

U results are considered in disagreement.

LLD results reported by llSL which are less than the LD criteria.

These results are omitted from future consideration.

Analyze Results The results obtained by the NRC Computer Data Analysis System which divide the Confirmatory Measurements results into the U, LLD, A, P, D, and N categories.

l I

i i

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L

[

-Invalidated Samples -

those results which-vere not considered for Acceptable / Unacceptable. calculations-due to dif f erences in. laboratory methods,.

sampling integrity compromises, or Con-firmatory Measurement Program discrep-encies. The following isotopic identifi-cations are considered. invalidated (in addition.to compromised samples):

Xe 133m (gas)

Kr 85 (gas)

La 140 (all media)

Isotopes on charcoal adsorbers other than I-131 Number / Percent the number and associated percentage of Acceptable results identified in the Analyze Results under A and P which were not subsequently invalidated.

Number / Percent the number and associated percentage of Unacceptable results identified in the Analyze Results under U and D which were not subsequently invalidated.

Unacceptable the sample, isotope, and number of Comparisons unacceptable comparisons of the total comparisons identified in Number / Percent Unacceptable.

III. Historical Performance The results of the Confirmatory Measurements Program were reviewed using the NRC Computer Data Analysis System.

The' summary results of these analyses are presented in Table 1.

Figure 1 presents performance results as a function of time (trend analysis) for each inspection sample collection period.

A discussion of the licensee's unacceptable comparisons and the if censee's proposed corrective action is presented in the previously referenced'IE inspection reports.

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