ML19296D296
| ML19296D296 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 02/25/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003030339 | |
| Download: ML19296D296 (4) | |
Text
b TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNESSEE 374o1 400 Chestnut Street Tower II February 25, 1980 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Denton:
In the Matter of the
)
Docket Nos. 50-259 Tennessee Valley Authority
)
50-260 50-296 In response to a verbal request from you staff we are submitting estimates of the incremental occupational man-rem exposure expected to be incurred as a result of the temporary onsite storage of low-level radioactive trash at the Browns Ferry Nuclear Plant as described in my letter to you dated January 21, 1980.
I would again like to stress that we need your consideration of our requested license amendment as soon as possible.
Very truly yours, TENNESSEE VALLEY AUTHORITY
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L7 M. M:.11s, Manager Nuclear Regulation and Safety Enclosure
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ENCLOSURE OCCUPATIONAL DOSE ESTIMATES FOR THE TEMPORARY STORAGE OF LOW-LEVEL RADIOACTIVE NASTE TRASH IN THE CABLE STORAGE WAREHOUSE AT BROWNS FERRY NUCLEAR PLANT Occupational doses due to low-level waste (LLW) trash handling, onsite transportation, and radiological monitoring in and around the cable ware-house area have been evaluated.
In addition, exposures have been estimated for workers stationed in areas near the cable storage warehouse; e.g.,
in the biothermal facility and the waste heat greenhouse.
The attached table contains all major assumptions used in the evaluation and the dose contri-butions to the various occupational segments considered. The total calculated occupational exposure due to the temporary storage of LLW trash in the cable storage warehouse is 32 man-rem.
9
BRO'JNS FERRY NUCLEAR PLANT - OCCUPATIONAL DOSE ESTIMATES FOR THE TEMPORARY STORACE OF LOU-LEVEL tiASTE TRASH IN TFE CABLE STORACE WAREHOUSE Ceneral Assemptions a.
8,000 drums are to be moved into the warehouse during the year. This gives an average yearly storage of 4,000 drums.
Because the stored drums must also be removed, the effective number of drums fundled and placed is 16,000.
b.
The average contained activity is 0.01 Ci per drum.
c.
Self-shielding of the drums is modeled by a 2.5-cm iron cladding around the periphery of the warehouse.
For exposures inside the warehouse, 1.2 cm of iron is used.
d.
Sixteen-inch thick concrete shield walls exist on the east, south, and west sides of the warehouse.
Handling Personnel a.
Drum handlers and health physics monitors - 2 men, 3 f t from 1 drum for 2.1 2 minutes / drum at 2.2 mR/h.
b.
Fork-lift driver - 1 man inside warehouse for 1 minute / drum at 78 mR/h 20.7 c.
Workers during transport to permanent onsite facility - 2 men, 6 ft from 1.8 q
l 1 drum for 10 minutues/ drum at 0.67 mR/h.
gi Subtotal 25 Q
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A Monitoring Personnel, c
Marchoose perf [hery monitoring, 10 t't f roni warehouse a.
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(1)
I worker at 35 mR/h for 8 min / day, and 1.7
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(2)
I worker at 0.9 mR/h for 8 min / day
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Marchonse smear sempting - 1 worker at 110 mR/h for 3 min / day 2.0 8
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Subtotal 3.8
e 2
4-Nearby Workers man-rem a.
Power stores warehouse office - 16 men for 40 h/wk with 85 percent 0.6 residence time at 0.02 mR/h i
b.
Power stores warehouse - 16 men for 40 h/wk with 15 percent 1.0 residence time at 0.20 mR/h Biothermal research facility - 10 men for 40 h/wk at <0.02 mR/h 0.4 c.
d.
Greenhouse office - 10 men for 40 h/ik with 50 percent resinence 0.5 time at 0.05 mR/h e.
Creenhouse - 10 men for 40 h/uk with 50 percent residence time 0.2 at <0.02 mR/h f.
Fish overwintering facility - 1 man for 40 h/uk at <0.02 mR/h 0.05 Subtotal 2.8 Total 32 man-rem e
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