ML20043E797
| ML20043E797 | |
| Person / Time | |
|---|---|
| Site: | Framatome ANP Richland |
| Issue date: | 05/31/1990 |
| From: | Malody C SIEMENS POWER CORP. (FORMERLY SIEMENS NUCLEAR POWER |
| To: | Pennington W NRC |
| References | |
| RTR-NUREG-CR-4884 NUDOCS 9006130393 | |
| Download: ML20043E797 (2) | |
Text
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y-3 ADVANCED NUCLEARFtMLS CORPORATION b
i3' %",LTNPS2 **'" """ " """'"
May 31,1990 j
RAPlFAX 1
p U.S. Nuclear Regulatory Commission Attn: Mr. W. Scott Pennington Uranium Fuel Section
-i This memo outlines our proposed new bloassay action levels and the basis for those levels. We have used the data in NUREG/CR 4884," interpretation of Bloassay Measurements,' to generate the attached graph which is somewhat easier to deal with than the tables.
The fraction of an acute intake which would be expected to show up in a 24-hour urine sample (1.4 t) 35 days after intake is 0.0012. For a single 9.6 mg uranium intake converted to pg/t the limiting concentration becomes 8.2-Using 8 pg/l as an action level is proposed and is considered as conservative for a sampling program with a monthly frequency. Sampling is not always exactly at a 30- or 31 day frequency due to days off, and 35 days for calculational purposes appears reasonable.
The concentration in urine 35 days after the intake of 20 mg, or approximately twice the allowable level would be 17 pg/t. (The last published draft of the proposed 10 CFR 20 set the allowable intake at 10 mg versus the existing 9.6 mg.) Therefore, a urine sample of 17 pg/l should be a sufficiently high intake to warrant removing the indMdual from work in contaminated radioactive materials areas entil subsequent sample results fall below 8 pg/l and is proposed as a second action level.
3 The attached pages of our license application have been revised to incorporate the revised limits and specifically address the toxicity limit. We plan to revise our program accordingly and would appreciate your comments.
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C. W. Malody 90061303 Q $ $$ N 57 PDR ADO PDC C
A Sremens Company
f ADMANCED NUCLEAR FUELS CORPORATION m p.2 SPECIAL NUCLEAR MATERIAL LICENSE NO. SNM 1227, NRC DOCKET NO. 701257 i
REV.
PART I LICENSE CONDITIONS lA Unusual occurroncos with documented evaluation will not be includod in i
calculating the quarterly average. However, diagnostic evaluations, as defined in Regulatory Guido 8.11, Section C.2.b(4), shall be performed in j
accordance with critoria set forth in Regulatory Guido 8.11, Figure 2.
4.
The following action guides shall apply to soluble, biologically j
transportable uranium compound:
An evaluation shall be performed for an Individual whose urino a.
specimon exhibits a concentration in excess of 8.0 mieregrams uranium /Iltor to dotormino whether the uranium toxicity limit has been excoodod. The employco shall be required to submit another urino specimon immodlately and at least weekly thereafter until a concontration of loss than 8.0 micrograms uranium / liter is reached.
Based upon the results of the ovaluation, worker rostriction may be
[
considorod.
b.
An individual whoso urino specimen exhibits a concontration in l
i excess of 17 micrograms uranium /litor shall not be allowed to work in contaminated areas until subsequent urino specimens exhibit a i
concentration of loss than 8.0 micrograms uranium /Iltor.
E 5.
The following action guidos shalt
. to insolublo, biologically '
nontransportablo uranium compounds'.
l Should the future 12-month doso commitment (based on in-vivo a.
examination) excood 5 rom (approximately 125 micrograms,0.27 nanocuries U 235), a doso ovaluation and investigation shall be performod. The individual will rocolvo in vivo examination at feast bi monthly as long as ho continuos to work in a contamination control area, and until futuro doso commitmont is loss than 3 rom for tho subsequent 12 months (75 micrograms,0.16 nanocurlos j
U 235),
J s
The action limit calculation is based on the quantity of an alpha emitter, with a 500-day biological half lifo in the pulmonary lung which doliyors an annual doso equivalent of 15 roms to the lung tissues according to ICRP rocommendations fitst issuod in 1960. Fiftcon roms por year is tho doso critorion on which the Maximum Permissiblo Concontrations (MPCs) ato based (l.o.,for radioactivo materials having the lung as the critical organ) which are prosently in effect in 10 CFR Part 20.
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ANF 3930.051 (Cv89) r.
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