ML19268C049
| ML19268C049 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 12/07/1979 |
| From: | Hulman L Office of Nuclear Reactor Regulation |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912200083 | |
| Download: ML19268C049 (2) | |
Text
s DEC ^ 71979
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Docket tio. 50-282
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tDORAftDU11 FOR: George Knighton, Chief Environmental Evaluation Branch, 00R FR001:
'. G. Hulman, Chief ilydrology-Meteorology Branch, DSE
SUBJECT:
REVISED PMIRIE ISLMD 1&2 METEOROLOGY EVALUATION FOR TIIE FUEL HANDLING ACCIDENT INSIDE C0fiTAI TENT -
TAC #6727 At the request of W. Paseda Enhiconmental EYaluation Branch (EEB)fo
- 00R, we have updated our ev ;.
onoftherelativeconcentration(Y/Q) fuel Handling Accident niside Containment.(FitAIC). TAC #6727 due to the acquisition of recent onsite meteorological data (April 197/ through March 1970). Unlike the analysis described in our July 31, 1979 remorandum on this subject, the data permits the use of the direction dependent model described in Reguletory Guide 1.145, " Atmospheric Dispersion Models for Potential Accident Consequence Assessments at Nucicar Power. Plants". The results of this updated evaluation and the July 31, 1979 evaluation are enclosed.
ThischaluationwaspreparedbyJ.LehineandE.MarkeeoftheMeteorology Section. At this time we cannot certify that there will not be significant,
changes in these updated. relative concentrations since this evaluation was made usin9 only one year of data from which the representativeness of long-term conditions cannot be determined.
'priginni Sisned by L. G. klcan L. G. Hulman, Chief flydrology-Meteorology Branch Division of Sito Safety and Environmental Analysis Enclosure DISTRIBUTION:
As Stated DOCKET FILES (50-282)
NRR RDG cc: w/ enclosure HMB RDG D. Muller.
D. Eisenhut W. Kreger E. Markee 7912200 O b 3 H. Pasedag O
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PRAIRIE ISLAND - FUEL HANDLING ACCIDENT INSIDE CONTAINMENT REEVALUATION OF RELATIVE CONCENTRATION
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Values of relative concentration have been calculated using a recent year (April 1977-March.978) of onsite meteorological data, and the direction dependent model described in Regulatory Guide 1.145. The results of this o.nalysis are given below, along with the v'alues provided in the July 31,-
1979 memorandum from Hulman to Knighton, Model: Regulatory Guide 1.145 - Directin.-Dependent Meteorological Data. 4/77-3/78 3
Exclusion Area Boundary (EAB)
Direction Distanec X/Q (soc /m )
0-2 hours SE 716m 4.7 x 10- '
Low Population Zone (LPc.
0-8 hours SE 2410m 7.0x10-5 8-24 h>urs 5.0 x 10-5 1-4 days 2.5 x 10-5 4-30 days 9.5 x 10-6 July 31 memorandum X/Q values.
Model:
S.R.P. 2.3,4 - Direction-Independent Meteorological Data: 6/71-5/72 Time Period Location Distance X/Q
.(,metcrs )
hec /cubicmeter) 0-2 hours EAB 715 1.4 x 10-3 0-8 hours LPZ 2410 1.9 x 10-4 8-24 hours LPZ 2410 l.3 x 10-4
- 4 days LPZ' 2410 6.6 x 10-5 4-30 days LPZ 2410 2.3 x 10-5 The ccnbination of new data and the Regulatory Guide 1.145 direction dependent model has.asulted in a reduction of nearly a factor of three in the EAB, 0-2 hour X/Q.