IR 05000259/1978015
| ML20062A283 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 08/30/1978 |
| From: | Millsap W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML18024A466 | List: |
| References | |
| 50-259-78-15, 50-260-78-16, 50-296-78-14, NUDOCS 7810120004 | |
| Download: ML20062A283 (4) | |
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UNITED STATES y
j, NUCLEAR REGULATORY COMMISSION
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REGION ll
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ATLANTA, GEORGIA 30303 os.,...../
Report Nos.: 50-259/78-15, 50-260/78-16 and 50-296/78-14 Docket Nes.: 50-259, 50-250 and 50-296
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License Nos.: DPR-33, DPR-52 and DPR-68 Licensee: Tennessee Valley Authority 830 Power Building Chattanooga, Tennessee 37401 Facility Name: Browns Ferry Nuclear Plants 1, 2 and 3 Inspection at: Browns Ferry Site, Athens, Alabama Inspection conducted: June 26, 1978 Inspector:
W. J. M111 sap
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Reviewed by.
A. F. Gibson, Chief Date Radiation Support Section Fuel Facility and Materials Safety Branch Inspection Summarv Inspection on June 26, 1978 (Report Nos. 50-259/78-15, 50-260/78-16 and 50-296/78-14)
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Areas laspected: Whole body counting practices and procedures and a J
test count of the NRC phantom on the whole body counter. The inspection involved 6 inspector-hours onsite by one NRC inspector.
Results:
In the one area inspected, no items of noncompliance or devia-tions were identified.
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I Report Nos. 50-259/78-15,50-260/78-16 and 50-296/78-14 I-1 DETAII.S I Prepared by:
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2 9 A 78 ii. J. Millsap, RJdiation Spepialist DateI l
Radiation Support Section Fuel Facility and Materials Safety Branch Dates of Inspectica J
, 1978
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Reviewed by:
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l A. F. Gibson, Chief Date Radiation Support Section Fuel Facility and Materials Safety Branch 1.
Persons Contacted
- J. G. Devesse, Plant Manager
- J. L. Lobdell, Supervisor, Radiation Service and Surveillance Section
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S. G. Bugg, Health Physics Supervisor 0. E. Hickman, Assistant Health Physics Supervisor.
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- Denotes those present at the exit interview.
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Questionnaire Review
Tne inspector reviewed with a licensee representative his answers to the questiocs concerning whole body counting sent to him in a letter signed by J. T. Sutherland, dated June 19, 1978. A summary of certain aspects of these results is given below.
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a.
Wole Body Counting System This system utilizes a two-detector chair-type whole body counter manufactured by Bio-Nuclear Measurements, Inc.
The two detectors, each NaI(TI) crystals, are of the following sizes:
for the torso (lungs and abdomen), 3" diameter x 3" thick; and for the thyroid, 1\\" diameter x \\" thics.
The torso crystal is shielded on the sides and back by 2" of lead; the thyroid crystal is shielded on the sides and back by \\"
of steel. The shadow shielding for both the crystals is provided by a " chair" of \\" of lead; this shadow shielded covers the field of view of both detectors. The torso detector head shadows the thyroid detector from the trunk of the subject's body. The torso detector is capable of restricting the field of view to the lungs or G.I. area or of opening to include the subject from the neck to the knees.
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l Report Nos. 50-259/78-15,50-260/78-16 and 50-296/78-14 I-2 l
l The system uses a Nuclear Data Model 2200 multichannel analyzer with 256 channels in use by each of the two detectors. Each channel represents approximately 10 key of energy.
Data reduction is accomplished off-site using a IBM 3700 computer located at Chattanooga, Tennessee. This computer utilizes a weighted least-squares program referred to as ALPlfA-M.
l The torso detector is calibrated for the following radionuclides:
l Cs-137, Co-60, Co-58, Cr-51, I-131, Zr-95-Nb-95, Cs-134, Ru-106, l
Ma-54, Mo-99, Fe-59 and Zn-65. The thyroid detector is calibrated i
for I-131.
An ideal lower limit of detection for Co-60 and Cs-137 for the
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torso detector is 8 nCi.
An ideal lower limit of detection for
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I-131 for the thyroid detector is 4 nCi. The normal period of
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count is 500 seconds.
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Procedures
Procedure DPM No. N73A16A of the Division of Power Production l
Procedures Manual (Bioassay Requirements for Nuclear Plant Works)
l states that each individual assigned to work in a bioassay area vill have a baseline bioassay, a bioassay upon termination and a routine yearly bioassay. Additional bioassays are performed upon the judgement of the facility health physicist. This procedure also states that individuals who have inhaled greater than 25* of the quarterly limit of radioactive materials will have followup-bioassays performed; individuals who have inhaled greater than 75*,of the quarterly limit of radioactive materials will be removed from work in the regulated areas for the remainder of the calendar quarter.
Radiation Dosimetry Procedure No. DOS-2 (General Procedure for the Operation of the Mobile Whole Body Counter) states that a full calibration will be completed at least every two years or more frequently if the consistency check or other substantial reason indicates that the last calibration is no longer accurate.
The calibration is carried out with the radionuclides in water solution in the upper phantom jug of two phantem jugs placed in
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an L-shaped gecmetr/ to simulate a human being. The thyroid detector is calibrated using a small vial placed on top of the two water-filled phantem jugs. The procedure also states that a l
resolution cheel should be performed at least each month, and more frequently if possible.
In addition, a channel check and consistency check are perfomed daily.
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