ML20154M511
| ML20154M511 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/16/1988 |
| From: | Mccoy F NRC OFFICE OF SPECIAL PROJECTS |
| To: | White S TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 8809290011 | |
| Download: ML20154M511 (4) | |
See also: IR 05000327/1988038
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SEP 161988
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Mr. S. A. White
Senior Vice President, Nuclear Power
Tennessee Valley Authority
6N 38A Lookout Place
1101 Market Street
Chattanooga, TN 37402-2801
Dear Mr. White:
SUBJECT:
DOCKET NOS. 50-327 AND 50-328, CONFIRMATORY MEASUREMENT RESULTS
SUPPLEMENT TO INSPECTION REPORT NOS. 50-327/88-38 AND 50-328/88-38
As part of the NRC Confirmatory Measurements Program, spiked liquid samples
were sent on June 2, F88 to your Sequoyah facility for selected radiochemical
analyses.
We are in receipt of your analytical results transmitted to us by
your letter dated August 18, 1988, and subsequent to verification of your
values as per our conversation by telephone on August 24, 1988, the following
comparison of your results to the knowr, val 's are presented in Enclosure 1 for
your information.
The acceptance criteria for the comparisons are listed in
Enclosure 2.
In our review of these data all ccmparative results were in agreement. These
data should be reviewed in greater detail by cognizant staff members for any
significant trends in the data among successive years in which samples have
been analyzed by your facility.
These results and any results from previous years pertaining to these analyses
will be discussed at future NRC inspections.
Sincerely,
Frank R. McCoy, Assistant Director
for TVA Inspection Programs
TVA Projects Division
Office of Special Projects
Enclosures:
1.
Confirmatory Measurement
Comparisons
2.
Criteria for Comparing
Analytical Measurements
cc w/ encl:
(See page 2)
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Mr. S. A. White
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cc w/encis:
J. L. LaPoint, Acting Site Director
Sequoyah Nuclear Plant
J. A. Kirkebo, Vice President,
Nuclear Engineering
R. L. Gridley, Director
Nuclear Safety and Licensing
M. Ray, Acting Site Licensing
Manager
TVA Representative, Rockville Office
General Counsel, TVA
State of Tennessee
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G. Fisher, Chemistry Manager
D. Nix, Court Room Supervisor
bec w/encis:
J. N. Grace, RIJ
J. G. Partlow, OSP
S. D. Richardson, OSP
S. C. Black, OSP
B. D. Liaw, OSP
K. P. Barr, OSP/RII
J. B. Brady, OSP/RII
J. Rutberg, OGC
NRC Resident Inspector
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DRS Technical Assistant
NRC Document Control Desk
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ENCLOSURE 2
CRITERIA FOR COMPARING ANALfTICAL MEASUREMENTS
This enclosure provides criter't- 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.
In these criteria, the judgment limits denoting agreements of disagreement
between licensee and NRC results are variable. This variability is a function
of the NRC's value relative to its associated uncertainty, referred to in this
program as "Resolution"8 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
each individual nuclide is computed.
This ratio is then evaluated for
agreemer.t 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
disagreement.
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2 Resolution = NRC Reference Value for a Particular Nuclide
Associated Uncerta'nty for the Value
Comparison Ratio = Licensee Value
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NkC Reference Value
TABLE 1
Confirmatory Measurements Acceptance Criteria
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Resolutions vs. Comparison Ratio
Comparison Ratio
for
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Resolution
Agreement
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<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. 25
{
>200
0.85 - 1. 18
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