ML20002B676
| ML20002B676 | |
| Person / Time | |
|---|---|
| Issue date: | 11/03/1980 |
| From: | Williams E Office of Nuclear Reactor Regulation |
| To: | Grimes B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8012220474 | |
| Download: ML20002B676 (1) | |
Text
_
Distribution:
1C
- ml File Nev a 3 50 EPDB File dRamos EWilliams ME.'CRANCUM FOR: Brian K. Grimes, Program Director Emergency Preparedness Program Office THRU:
Steve L. Ramos Chief Emergency Preparedness Develo:nent Branch FROM:
Ed William Emergency Prepredness Development Branch
SUBJECT:
AIRSCRNE RADIOI00!NE ALAP.M LEVEL FOR THE TSC AND EOF I have reviewed the measurement sensitivity for the airborne radiciodine alarm, in the TSC and ECF within the context of Section 6.4 of the SRP, The thyroid dose limits for CR personnel are 30 rem over the course of the accident. This course of the accident seems to be based on an exposure time of 5 days (food and water stored) or 6 days (breathing air with the CR sealed). Assuming a maximum exposure time of >6 d.ays (150 h), the alarm level should not exceed 200 arec/h. Over this time period, all of the radioiodines will decay to'<1%
of their initial activity except for 131 Using the NC"P 1
dose to the adult thyroid, a concentration of 135 X 10 I values for 131 I
p C1/cc ' 200 mrem /h.
This number is safe sided in that for releases during the first s 8 h after shutdown, this concentration would provide a thyroid dose of % 60 mrcm/h based en the Tables in the EPA Manual (which in turn are based primarily on the RSS WASH-1400) with all the radiotodines present.
Therefore, I would recornend 4 sensitivity of 1.7 X 10-7p C1/cc or less e for the airborne radiciodine emergency alarm level in both the ECF and TSC.
Original Signed 37 Ed Williams Emergency Preparedness Development Branch I
s, -
>d
{.'
801222o 419
.!.C-EP Df,MPPO..
IEPPO.
ome SURNAY f-em p06U30
.p8/7 /30 i
I L
N A C FO R M J IS (9-761 N ACM ':243 Cu. GCVE ANMENT P AINTING CFFICE: 1979-039 J69
~
--