Document a4qO87LXnXOQogNzqd7zQpyKM
Interoffice Communication
To A. H. Sather
From
J. V. Uptain
Date February 3, 1977
Subject : VCM PERSONNEL DOSIMETRY PLAN CHANGES
Attached are my recommendations for reducing plant VCM personnel dosimetry rates (see Table II). These recommendations are based on:
1. The results*of all dosimetry during the July 1, 1976 December 31, 1976 period (See Table I).
2. A strictly subjective assessment of the relative exposure risks, irrespective of the "numbers".
In reviewing the results in Table I, note that the "2-sigma Upper Control Limit" respresents, that value, based on sampling, below which we can be 95% confident the true mean exposure exists. The "chances" of the exposure being greater are 5%, assuming our sampling was randomized and otherwise adequately representative.
In reviewing Table II, it will be noted that the plan for categories II and III is not substantiated by the "numbers". Even so, the more conservative approach, as recommended, should be taken to detect long-term change that might otherwise go undetected.
The proposal, if used, will reduce sampling from approximately 1,032 samples per year to something like 341. This represents a 67.0% reduction, the change being made on what is considered to be a very conservative.basis.
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TABLE I
SUMMARY OF VCM PERSONNEL DOSIMETRY RESULTS JULY 1, 1976 - DECEMBER 31, 1976
WORKFORCE GROUP
NO. MEAN
STD DEVIATION
SAMPLES (PPM,VCM) (PPM, VCM)
2-SIGMA UPPER CONTROL LIMIT
(PPM,VCM)
Transportation Office, Supervision Reactor Lead Operators Vinyl Dryer Lead Operators Maintenance Electricians Maintenance Machinists Maintenance Painter/Carpenter Maintenance General Helpers Laboratory Supervisors Compound Supervisors Compound Workers -All, including
Dry Blend All Management, Administrative,
5 Office Workers not otherwise listed Transportation Warehouse
Workers Warehouse Workers Vinyl Dryer Supervisors Vinyl Dryer Operators/Utilities Maintenance Instrument Technicians Maintenance Building Attendents Maintenance Utility Technicians Laboratory - All Technicians Safety Department Personnel Mechanical Engineers Administrative Services Yard Supervisor Yard Operators Reactor Supervisors Reactor "A" Operators Maintenance Supervisors Maintenance "A" and "B"
Mechanics, Helpers Process Engineers
17 8 8 3 3 3 7
14 13
60
11
56 14
9 31
5 6 4 39 15 13 36 3 25 25 22 11
37 18 516
0.12 0.06 0.15 0,10 0.08 0.22 0.09 0.11 0.17
0.11
0.08
0.15 0.18 0.23 0.17 0.21 0.24 0.23 0.15 0.11 0.09 0.14 0.37 0.35 0.29 3.62 0.22
0.72 0.31
0.14 0.18 0.15 0.17 0.07 0.08 0,13 0.15 0.16
0,17
0.13
0,28 0.27 0.27 0.20 0.28 0,38 0.17 0,18 0,26 0.21 0.20 0.32 0.59 0.43 15.94 0.41
3.73 0.63
0.39 0.42 0.45 0.45 0.21 0.37 0.35 0,40 0.49
0.46
0.34
0.71 0.73 0.77 0.58 0.77 1.00 0.56 0.52 0.63 0.52 0.53 1.01 1.53 1.15 35.51 1.05
8.37 1.56
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TABLE II
RECONMENDED SAMPLING PLAN VCM PERSONNEL DOSIMETRY
CATEGORY I :
Discontinue
1. Transportation Office, Supervisors 2, All Management, Administrative, Office Workers not Otherwise Listed.
CATEGORY II :
One Sample Per Year
.1 Maintenance Electricians
2. Maintenance Machinists
3. Maintenance Painter/Carpenters
4. 5.
Maintenance General Helpers Laboratory Supervisors
CATEGORY III ;
One Sample Per Shift Per Year
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1. Vinyl Dryer Lead Operators
3. Compound, Dry Blend Workers
2. Compound Supervisors
CATEGORY IV :
One Sample Per Quarter
1. Transportation Warehouse Workers 2. Warehouse Workers
5. Safety Personnel 6, Mechanical Engineers
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3. Maintenance Instrument Technicians 7. Administrative Services 4. Maintenance Building Attendents
CATEGORY V :
One Sample Per Shift Per Quarter
.1 Reactor Lead Operators
4. Maintenance Utility Technicians
2. Vinyl Dryer Supervisors
5. Laboratory Technicians
3. Vinyl Dryer Operators and Utilities
CATEGORY VI :
One Sample Per Month
.1 Yard Supervisor
2. Maintenance Supervisors
3, Maintenance "A" Mechanics
4, Maintenance "B" Mechanics 5. Maintenance Helpers 6. Process Engineers
CATEGORY VII :
One Sample Per Shift Per Month
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1. Yard Operators
2. Reactor Supervisors
3. Reactor "A" Operators
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