ML19326A136

Confirmatory Measurements Program

ML19326A136
Person / Time
Site:	Davis Besse
Issue date:	09/01/1976
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
Shared Package
ML19326A134	List: ML19326A133 ML19326A136
References
NUDOCS 8002030015
Download: ML19326A136 (6)

Text

.c.

9

("T n/-

s

. CONFIRESTORY MEASURDtFliTS PROGRAM I.

Introduction 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 Laboratory Analysis 4

The following counting times and instrumentation are generally used by the NRC Reference Laboratory:

4 Media Analysis Instrumentation Count Time

• Liquid Cross Beta

. Proportional 20 minutes H-3 Liquid scintillation 10 minutes Sr-90, total Sr Proportional 20 minutes Gamma Spec GeLi 60 minutes-Gas Gamma Spec GeLi 60 minutes Particulate Gamma Spec Celi 60 minutes filter-Charcoal Gamma Spec GeLi 60 minutes Adsorber-

• or 20,000 counts.

III. Limits for Detectability-The reported NRC reference _ laboratory results are reviewed to deter-mine if the results are above specific limits for detectability (LD).

Values below the LD are not used for comparison purposes.

These LD values are as follows:

1.-

Liquid and Gas Specific radionuclide concentrations of 10% of their MPC in 1-10 CFR 20, Table II, Column B, of more restrictive value of soluble or insoluble limit.

2.

Particulate Filter and Charcoal Adsorber P

Specific radionuclide activity present on filter (pC1/sampic)

.at the following levels:

4 i

l 8002030d6 s

4-

m.

,-~

• [=,

's * -

Imtepu-Q Irotope Q

-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

-5 Co-57 2

x 10 Cs-134 2 x 10

-5

-5 Co-58 1.5 x 10-

.Cs-137 2 x 10-5 Co-60 3

x 10 Ba-140 2 x 10-5 x f 'j La-140 4 x 10 Fe-59 3

5 Cc-141 2 x 10 Zn-65 3

x

-4 Sr-89 1

"u Ce-144 1 x 10-5 Sr-90 2

. 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 sample 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-140 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 utilized to determine whether results are 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-able, while ' disagreement' or 'not reported by licensee' are con-sidered unacceptable.

VI.

Reporting 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 Computer Data Analysis System. The com.

pleted report, example in. Table I, is submitted to the licensee by

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

n i ' %; - e.*.'

~

As seen 1n1 Table 1, results are provided for each sample by isotope. The respective parameters are:

l'.

NRC reference laboratory result and' error (uncertainty).

2.

Licensee result and error.(uncertainty).

3.

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

pCi/cc for gas samples pCi/ml for liquid. samples pCi/ sample for particulate filters and charcoal adsorbers 4.

Z Value 3

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

-the reported values.

- X )/(#k + 2)%

?

Z value = (X 2

2 1

where X = NRC value 1

X = Licensee value 2

0 = NRC error 1

0 = Licensee error 2

5.

PCT 3 -

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

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

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

2 g

6.

RAT The ratio (RAT) is defined in Attachment 1 as:

RAT = 5 /

2 1 7.

RES The resolution :(RES) is defined in Attachment 1 as:

RES = X /0 g g 4

n m

o n

~,

e s~

\\

8.

T The test result (T) is defined in Table 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 ;

9

q7

_7

^.,=

n

.-s

.. ~.'

ATTACl! MENT 1 CRITERIA FOR COMPARING ANALYTICAL MEASUREMENTS iThis attachment 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 program.

i

_In these criteria,1 the judgment limits are var'iable. in relation to the comparison of.the NRC Reference Laboratory's value to its associated

_one sigma uncertainty. As that ratio, referred to in this program as

" Re solution", increases, the acceptability of a licensee's measurement should be more 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 figures reported

~by the NRC Reference. Laboratory, unless such rounding will result in a

-narrowed category of 'eceptance..The acceptance category reported will A~

be the narrowest into which the ratio fits for the resolution being used.

RESOLUTION RATIO = LICENSEE VALUE/NRC REFERENCE VALUE 4

Possible Possible Agreement Agreement "A" Agreement "B"

<3-No Comparison No Comparison No Comparison 2.5 0.3 - 3.0 No Comparison

>3 and <4 0.4

.E[4and<8

0. 5'

- 2.0 0.4 2.5 0.3 - 3.0

>8 and.<16 0.6 - 1.67 0.5 -

2.0 0.4 - 2.5

}

~ >16 and <50 0.75 - 1.33 0.6 - 1.67 0.5 - 2.0

~

l

}[50and<200 0.80 - 1.25 0.75 - 1.33 0.6 - 1.67

>200 0.85 - 1.18

- 0.80 - 1.25 0.75 - 1.33 I

i' "A" criteria are applied to the following analyses:

4 Gamma. spectrometry, where principal gamma energy used for identifi--

. cation is greater than 250 kev.

Tritium analyses of liquid samples, t

i "B"' criteria are applied to the following analyses:

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

Sr-89'and:Sr-90 determinations.

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

a d

4'-

l

- - + -

t

• gi-p y-g+-

Q

+---'y

+e--

--h-y W

g e

+-

-W3

.~

e 6

D I

4 O e < q e 4.:-

, < < 7, '-

1 I

I

-..: -o

. n.

. -c..

c a

i I

'l

+. +

+ + + + 4 4 + 4

+ + 4 4.

I 4 +

4 4

1

'l i t. 'I

'l

't

'I ar

't'*,r1 ej -

at- 't

.g>1 e t - 'l

'l

'l I

O f.

4 r5 e g o V

f

.T o' : 3 e oa.e 1

1 N

FA T

.t

-7 fa noen o4 tr 1

1 c

r;

,,1 C.

- CC

, i + + 1 +

+

1

+ 1 I.++ i l l l 1

+

'L V-y

• L L-1 1 1 1 1 Lt

• ' i t' is L l'

L

.~. A S y

.Z g-( r. !

4

?

2%

(.'.

3 e

1-Y C

N A 7

.% ~I aN % y 7

r-I O%

. C e.-

N -

e-,.w-e e.

-e s.

. + +

+ + + +..

+

s

• V N

+ +

+ + + + +

+ +

+

+

TC 1 1 1 L -" -

1 1 1 1

.L 1-1 a t J L. A l.

1 i ~.

r5

.c--<S 1

I 1

N 7<-w -m

.: n,. 4 _. 4 t

i

~.

1 I -

+ f

+ + l.+ + + + +

c

>l t

c c-

: ce

n - c: :

i -

1 -

4l

+ 1 + + + +

+

+

2 f

) <

al 1 il S1 2 l' q

.1 t-q' 2 2

'.L q' a l'

L X

E r

Ol J'

Y l >

1 4

. Z M'.C Y> :

CWq C. :. :

I C

C I

Ul

~

~

1 N A -

V.

-cr-a,r.<

n. ;

N.

.r 1

1

'l J

ml L

V C

J I

<- < r<<<<e a_ F. AA y A.

.I

.N,.

.4 l l

-. 1 1

1

'J.

s 4l 1 I I I I I I l l

[

l I i l l Y

l C f 1 i

e a

e-1 3

1 5 1 e 1 1

.1.

e,-

gl t

g 3

'; Y C 3.

h

• f. l t

• t'2 4 N h X

.C 4 X h

+ -

V c

y 2

2 u)l 4

1.

r C :-,e

.c r: c e

t. m L

w 4

y-

- y s.

I l l I l i l l l i I l I l i f 1

3 F

d I

~

V

^

2 a auL u12

'L a u 1 tj. u ua 1

il

~'

f

• L l

/

T -

~

T i

.. ~ ;

i~

5 C

..%.h 1

'l 1

- C '-

l 7

< T

<aS y < g-3 v xy a

'l t.'

$1 2 3

7 V

4 i T

<t'..<-

'l I

t.v 4

{ f t-1, 1

n,., W,~,: h I

r X,,. s,.

s n

s l I I l l l 4 1 I J l ! I l i i l

I 1

l !

2 a 1uu 1 a1 3 t1 4 12

'l ua 2

J C

1 Y

< n.

O. O C O C C. C Oc;CcC O.

I 2 I

'l h FW f N-4 -

f4( < 4<

f V

T,,,,,

h,.

-.- e s.-

W W- -We s'

X f<

C f I t' f 4 e

I

.i l i i l i l i l -

w

-n

- i-I 1 -*

i l I 8

l l l I 2 tl

'l 1 u a L1 u a: a u ua c,1 11 1 LL a

1 V

.* O r" - f* s*

T A -- if it c-F

'I

(

.u

'I.

l 11 e

• l T A P

<N-4 1 r-A N 7(N - ? A 2

L1 i

tL W tc tr w

L

" C C <

l*-

sv V of LL =

~?

9 C T J 4 to M t-of M x W 5 cr tf W

tr s

H 1

I'

'.[

y 4

3' i

e-c=*

H e"

s-

,, e e,-

c V

1 0

< ' V V !u

!! L1 11 L1

'l u

!M

-v V. V

'l

• ' C tJ I I A X >= A A X

1. 2u J. <

3

• 1

'1

,.L 7

y n

L1 L1 V

LJ tI s-u < v.C.

ti y s--

u y

H H.

y J

.J f

'-g

.f tJ' ~

/

J o

q

.,. t,e

+

/

h Ij 41 11 H <.

1 ~

1 u

ll at il ll V

88 C

1 L.*

H <. *

"')

i 1

\\

-