ML20198R098
| ML20198R098 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/09/1998 |
| From: | Mcclanahan S MINNESOTA, STATE OF |
| To: | NRC |
| References | |
| NUDOCS 9801230219 | |
| Download: ML20198R098 (4) | |
Text
7 J-10 Minnesota Department cf Health 121 East Seventh Place a
P.O. Box 64975 =
St. Paul, MN 55164 0975 4
- )
O a
January 9,1998
Dear Interested Party:
Enclosed for your information is the State of Minnesota December 1997 IMta
?
ksportfor the l'raine Island Independent Spent Fuel Storage Installation.
If you would like additional copies or have any questiens about the report, please contact Tim Donakowski of my staff at (612) 215-0935.
if your mailing address is incorrect or if it changes, please inform us so that we may keep our mailing list current.
Sincerely, 0)Y
,f' A
Sue McClanahan, Supervisor Radiation Control Unit SM/fDD:tdd Atuchment a
)
N\\
9001230219 990109 7
PDR ADOCK 05000282:
y
{f
, g Y
PDR y,
TDD: (612) 623-5522 (Twin Cities) 1800-627 3529 (Greater Minnesota)
MF0G An Eq Jai Opportunity Ernotoyei
'o
?
Prairie Island Nuchar Generating Plant
~
Independent Spent F el Storage Installation introduction This.eport provides data on radiation levels inside the Northern States Powrr Company's (NSP) Independent Spent Fuel Storage Installation (ISFSI) at the Prairie Island NLclear Generating Plant for December 1997. The report contains data gathered according to agreements between NSP and the Minnesota Dcpartment of IIcalth (MDII).
Currently, seven casks are storing spect fuelinside the ISFSI.
Pressurized Ionization Chamber (PIC) Monitorine Dming this reporting period, daily radiation data were collected by the PIC system, s,hich was installed in January 1995. The system consists of two ion chambers, computer meraories and modems that are contacted about every 20 minutes by llealth Department computers in St. Paul. The computers automatically call llealth Department staff if unusual radiation levels are detected. One chamber is located about 100 feet north of the casks and the other is about 100 feet south.
Data were collected from December 1 throud December 31,1997, and are summarized in Table 1 far Plc No.1 and in Table 7 fu s 4 ' No. 2. Daily averages are presented, though data for every five minutes are maee.
Analysis and Comments Normal levels of ambient radiation were observed inside the Prairie Island Nuclear Generating Plant ISFSI during December 1997.
PIC No. I readings varied from 75.5 to 78.7 micro R per hour. PIC No. 2 readings rnnged from 72.6 tt 75.5 micro R per hour.
All readings appear to be within the normal ranges of ambient radiation levels inside the ISFSI near the casks (about 100 feet away): 70 to 90 micro R per hour.
Before any casks were in place, the natural background radiation levels inside the ISFSI ranged from 7 to 13 micro R per hour.
Additional monitoring data on radioactivity levels in other media (alr, for example) are available in the' annual MDil " Environmental Radiation Data Report," issued in June 1997.
t 1
A u
~
Table'1. December =1997 Data Report for PIC No. 1
? Start Start Erid End Ave. Dose Intervat Intervat~
Standard Interval Data 1
Date Time Date Time Dose Rate Max Min Orv.
Time Recovered Recovered
'12fu1/97. 00:00:00m 12/02/97 00:00:00m 1.836mt 76.5d /h 77.t d/h 75.8d /h 0.2d/h 001-00:00 001-00:00' 100.0 12/02/97 00:00:00m 12/03/97 00:00:00m 1 841ae 76.7d/h 78.1 d/h 76.1d/h 0.3dt/h 001-00:00 001-00:00 C4 12/03/97 00:00:00m.12/04/97 00:00:00m 1.858sa 77.4 d /h 78.6ut/h 76.5dt/h -
0.4d/h 001-00:00 001-00:00 tiTL.f.
12/04/97 00:00:00m = 12/05/97 00:00:00m 1.852sa 77.2 d /h 78.tuR/h 76.4dt/h 0.3d/h 001-00:00 001-00:00 100.0 12/05/97 00:00:00m 12/06/97 00:00:00m 1.851d 77.1d /h 77.8uR/h 76.5uR/h 0.3dt/h 001-00:00 001-00:00 100.0 ~
12/06/97 00:00:00m 12/07/97 00:00:00m.
1.840sa 76.7dt/h 77.4dt/h 75.9d/h 0.2uR/h 001-00:00 001-00:00 100.0 12/07/97 00:00:00m 12/08/97 00:00:00m 1.846se 76.9dt/h 78.0uR/h 76.2dt/h 0.3uR/h 001-00:00 001-00:00 100.0 12/0er97 00:00:00m 12/09/97 00:00:00m 1.849se 77.1uR/h 77.8dt/h 76.3Jt/h 0.3d/h 001-00:00 001-00:00 100.0 12/09/97 00:00:00m - 12/10/97 00:00:00m 1.855se 77.*uR/h 78.1dt/h 76.5dt/h 0.3uR/h 001-00:00 001-00:00 100.0' 12/10/97 00:00:00m 12/11/97 00:00:00m 1.846sa 76.9dt/h 77.7ut/h 76.1dt/%
0.3dt/h 001-00:00 001-00:00 100.0 12/11/97 00:00:00m 12/12/97 00:00:00m 1.850mm 77.1d /h TT.8dt/h
'76.ha/h 0.3uR/h 001-00:00 001-00:00 100.0 l
~!
12/12/97 00:00:(7'.m 12/13/97 00:00:00m 1.855ae 77.3dt/h 78.2d/h 705d/h 0.3dt/h 001-00:00 001-00:00 100.0 12/13/97 00:00:00m 12/14/97 00:00:00m 1.85 fee 77.3uR/h 78.1dt/h 76.5dt/h 0.3Jt/h 001-00:00 001-00:00 100.0
'N 12/14/97 00:00:00m 12/15/97 00:00:00m 1.863sa 77.6dth 78.7uR/h 76.7uR/h 0.4uR/h 001-00:00 001-00:00 100.0 12/15/97 00:00:00m 12/16/97 00:00:00m 1.857mR 77.4uR/h
.78.4uR/h 75.Sua/h 0.5uR/h 001-00:00 001-00:00 100.0 12/16/97. 00:00:00AM 12/17/97 00:00:00m 1.845sa 76.9dt/h 78.1uR/h 75.6dt/h 0.6st/h 001-00:00 001-00:00 100.0 12/17/97 00:00:00m 12/18/97 00:00:00m 1.847 set 77.0uR/h 77.8Jt/h 75.9um,h 0.4uR/h 001-00:00 001-00:00 1C'.0 12/18/97 00:00:00m 12/19/97 00:00:00AM 1.850mm 77.1uR/h 77.8uR/h 76.2uR/h 0.4ua/h 001-00:00 001-00:00 '100.0 3
12/19/97 ' 00:00:00m 12/20/97 00:00:00m 1.838mR 76.6uR/h 77.4uR/h 75.8uR/h 0.3ua/h 001-00:00 001-00:00 100.0 12/20/97 00:00:00m 12d1/97 00:00:00m 1.842sa 76.8Jt/h -
77.7d /h 75.9dt/h 0.4dt/h 001-00:00 001-00:00 100.0 12/21/97 00:00:00AM 12/22/97 00:00:00AM 1.848d 77.0Jt/h
- 78. tut /h 76.1dt/h 0.5dt/h 001-00:00 001-00:00 100.0
~ 12/22/97 00:00:00AM 12/23/97 00:00:00m 1.837mR 76.5d /h 77.2dt/h 75.8uR/h 0.2dt/h 001-00:00 001-00:00:100.0 12/23/97 00:00:00AM 12/24/07 00:00:00m 1.840se 76.7d /h 77.5dt/h 76.1uR/h 0.3dt/h 001-00:00 001-00:00: 100.0 12/24/97 00:00:00AM 12/z5/97 00:00:00AM 1.847sp 77.0dt/h 77.6uR/h 76.2ut/h 0.2uR/h 001-00:00 001-00:00 100.0" 12/25/97 00:00:00AM 12/26/97 00:00:00AM 1.845se 76.9uR/h U.7d/h 76.3d/h 0.2uR/h 001-00:00 001-00:00 100.0 '
12/26/97 00:00:00AM 12/27/97 00:00:00AM 1.846se 76.9dt/h 78.0uR/h 75.9uR/h a.5dt/h 001-00:ca 001-00:00"100.0 12/27/97 00:00:00AM 12/28/97 00:00:00AM 1.852ndt 77.2d /h 78.2 d/h 76.2Jt/h 0.4Jt/h 001-00:00 001-00:00 100.0 12/28/97 00:00:00AM 12/29/97 00:00:00AM 1.851se 77.1d /h 78.1Jt/h 76.3Jt/h 0.3dt/h 001-00:00 001-00:00 100.0 12/29/97 00:00:00AM 12/30/97 00:00:00AM 1.851se 77.1uR/h 78.0uR/h 76.3dt/h
,0.3uR/h 001-00:00 001-00:00 100.0
}
12/30/97 00:00:00AM 12/31/97 00:00:00AM 1.855sa 77.3uR/h 78.2uR/h 76.4dt/h 0.3uR/h 001-00:00 001-00:00 100.0 12/31/97 00:00:00AM L01/01/98 00:00:00AM 1.863ae 77.6dt/h 78.7dt/h 76.7d/h 0.3Jt/h 001-00:00 001-00:00 100.0 12/01/97 00:00:00AM 01/01/98 00:00:00AM 57.31se 77.0Jt/h 78.7Jt/h 75.5uR/h
'O.4uR/h 031-00:00 031-00:00 :100.0 l
la
= -
s Table 2. December 1997 Data Report for PIC No. 2 Start Start End End Ave. Dose Intervat Intervat standard Interval Data Date Time Date Time Dose Rate Max Min Dev.
Time Recovered Recovered 12/01/97 00:00:00AM 12/02/97, 00:00:00m 1.7602 73.3d /h 73.9uR/h 72.8uR/h 0.2uR/h 001-00:00 001-00:00 100.0 12/02/97 00:00:00AM 12/03/97 00:00:00AM 1.766d 73.6d/h 75.2uR/h 72.9uR/h 0.3uR/h 001-00:00 001 00:00 1r 3.0 12/03/97 00:00:00AM 12/04r97 00:00:00AM 1.781d 74.2cR/h 75.5uR/h 73.3d/h 0.4d/h 001-00:00 001-00:00 100.0 12/04/97 00:00:00AM 12/05/97 00:00:00AM 1.774mR 73.9uR/h 74.6uR/h 73.3uR/h 0.2uR/h 001-00:00 001-00:00 100.0 12/05/97 CJ:00:00AM 12/06/97 00:00:00AM 1.772d 73.8uR/h 74.5uR/h 73.0uR/h 0.2uR/h 001-00:00 001-00:00 100.0 12/06/97 00:00:00AM 12/07/97 00:00:00AM 1.763d 73.SuR/h 74.0uR/h 72.9uR/h 0.2d/h 001-00:00 001-00:00 100.0 12/07/97 00:00:00AM 12/08/97 00:00:00AM 1.768mR 73.TuR/h 74.4uR/h 73.0uR/h 0.3uR/h 001-00:00 001-00:00 100.0 12/08/97 00:00:00AM 12/09/97 00:00:00AM 1.772mR 73.8d/h 74.9d/h 73.0uR/h 0.3uR/h 001-00:00 001-00:00 100.0 12/09/97 00:00:00AM 12/10/97 00:00:00AM 1.778mR 74.1uR/h 74.7uR/h 73.SuR/n 0.2uR/h Ovi-00:00 001-00:00 100.0 12/10/97 00:00:00AM 12/11/97 00:00:00AM 1.772d
- 73. bur /h 74.5uR/h 73.3uR/h 0.2uR/h 001-00:00 001-00:00 100.0 12/11/97 00:00:00AM 12/12/97 00:00:00AM 1.774d 73.9uR/h 74.5uR/h 73.3aR/h 0.2uR/h 001-00:00 001-00:00 100.0 12/12/97 00:00:00AM 12/13/97 00:00 00AM 1.780mR 74.2uR/h 74.9uR/h 73.6uR/h 0.3uR/h 001-00:00 001-00:00 100.0 12/13/97 00:00:00AM 12/14/97 00:00:00AM 1.782mR 74.2d/h 74.8uR/h 73.6 d /h 0.2uR/h 001-00:00 001-00:00 100.0 12/14/97 00:00:00AM 12/15/97 00:00:00AM 1.787mR 74.5uR/h 75.3uR/h 73.4uR/h 0.3uR/h 001-00:00 001-00:00 100.0 12/15/97 00:00:0093 12/16/97 00:00:00AM 1.785mR 74.4uR/h 75.1uR/h 73.3d/h 0.3uR/h 001-00:00 001-00:00 100.0 12/16/97 00:00:00AM 12/17/97 00:00:00AM 1.775mR 74.OuR/h 75.0uR/h 72.8uR/h 0.SuR/h 001-00:00 001-00:00 100.0 12/17/97 00:00:00AM 12/18/97 00:00:00AM 1.775mR 74.0uR/h 74.9uR/h 73.2uR/h 0.4uR/h 001-00:00 C01-00:00 100.0 12/18/97 00:00:00AM 12/19/97 00:00:00AM 1.777mR 74.0d/h 74.9d/h 73.2d/h 0.4uR/h 001-00:00 001-00:00 100.0 12/19/97 00:00:00AM 12/20/97 00:00:00AM 1.763mR 73.4 d/h 74.2uR/h 72.6uR/h 0.3uR/h 001-00:00 001-00:00 100.0 12/20/97 00:00:00AM 12/21/97 00:00:00AM 1.767d 73.6uR/h 74.6d/h 72.9uR/h 0.3d/h 001-00:00 001-00:00 100.0
(
12/21/97 00:00:00AM 12/22/97 00:00:00AM 1.771mR 73.8uR/h 74.7uR/h 73.0uR/h 0.4uR/h 001-00:00 001-00:00 100.0 12/22/97 00:00:00AM 12/23/97 00:00:00AM 1.7622 73.4uR/h 74.0uR/h 72.6uR/h 0.2uR/h 001-00:00 001-00:00 100.0 l
12/23/97 00:00:00AM 12/24/97 00:00:00AM 1.764mR 73.5d/h 74.2uR/h 72.9uR/h 0.3d/h 001-00:00 001-00:00 100.0 l
12/24/97 00:00:00AM 12/25/97 00:00:00AM 1.769mR 73.7uR/h 74.4 d/h 73.OuR/h 0.2uR/h 001-00:00 001-00:30 100.0 12/25/97 00:00:00AM 12/26/97 00:00:00AM 1.766mR 73.6d/h 74.3 d/h 73.02 /h 0.2uR/h 001-00:00 001-00:00 100.0 12/26/97 00:00:00AM 12/27/97 00:00:00AM 1.768d 73.7uR/h 74.7d /h 72.6uR/h 0.4uR/h 001-00:00 001-00:00 100.0 12/27/97 00:00:00AM "2/28/97 00:00:00AM 1.772mR 73.9d/h 74.8uR/h 73.OuR/h 0.4d/h 001-00:00 001-00:00 100.0 12/28/97 00:00:00AM 12/29/97 00:00:00AM 1.T74d 73.9uR/h 74.7uR/h 73.2uR/h 0.3uR/h 001-00:00 001-00:00 100.0 12/29/97 00:00:00AM 12/30/97 00:00:00AM 1.774mR 73.9d/h 74.SuR/h 73.3uR/h 0.2uR/h 001-00:00 001-00:00 100.0 l
)
12/30/97 00:00:00AM 12/31/97 00:00:00AM 1.7772 74.0uR/h 74.8uR/h 73.2 d/h 0.3d/h 001-00:00 001-00:00 100.0 12/01/97 00:00:00AM 01/01/98 00:00:00AM 54.95mR 73.9uR/h 75.5uR/h 72.6uR/h 0.0uR/h 031-00:00 031-00:00 10.0 T
h