Measurements of Grain-Boundary Inventories of 137 Cs, 90 Sr and 99 Tc in Used Candu Fuel
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MEASUREMENTS OF GRAIN-BOUNDARY INVENTORIES OF CANDU FUEL
1 37
Cs,
90
Sr AND 99Tc IN USED
S. Stroes-Gascoyne, J.C. Tait, R.J. Porth, J.L. McConnell, T.R. Barnsdale and S. Watson. AECL Research, Whiteshell Laboratories, Pinawa, Manitoba, Canada, ROE ILO ABSTRACT Two methods were used to measure grain-boundary inventories of 1 3 7Cs, 9 0 Sr and 9 9 Tc in used CANDU fuel, to corroborate source term estimates based0 on a fission gas release code. Used fuels were partially oxidized at 200 C in air to overall compositions of U02.. (0.15< x 3 im and
43
GAP 1 3 7 + GRAIN-BOUNDARY 90 9 9 RELEASE (IN % OF TOTAL INVENTORIES) FOR c., Sr AND Tc FROM SLIGHTLY OXIDIZED USED FUEL
TABLE I:
5G00815W BG00815W PA13894W PA13894W BF12059C BF12059C B O.E. INT.E. O.E. INN.E. O.1. INT.E.
Used Fuel
burnup (GJ/kg U) average (peak) power
(kW/m)
fuel oxidized to
585 41(46)
470 33(38)
715 44(48)
530 32(35)
950 46(50)
810 38(41)
U02.
U02.26
U02.15
U02.27
U02.15
U02.20
0.17 0.19
0.15 0.18
0.46 0.50
0.41 0.47
2.17 2.22
0.95 0.95
8.20
3.53
10.00
3.35
17.33
5.34
0.28 0.41
0.31 0.51
0.10 0.27
0.01 0.01
0.51 0.66
0.27 0.39
0.95 1.11
0.93 1.46
0.33 0.60
1.14 1.23
0.46 0.59
0.91 1.06
137Cs release after cycle 1 after cycle 1 + cycle 2 gap + grain-boundary . fission gas inventory 90
20
Sr
release after cycle 1 after cycle 1 + cycle 2 99
Tc release after cycle 1 after cycle 1 + cycle 2 9 P O.E. INT.E. INN.E.
cycle 1: DIW, -200 d cycle 2: SCSSS, -100 d calculated with the computer code ELESIM [101; separate values for gap and grain-boundary inventories are given in (i]
= Bruce Generating Station Fuel - Pickering Generating Station Fuel e outer ring element - intermediate ring element - inner ring element
2.30
1
1
Fuels OE I-- --INT.EI-- - I PA13894W, OE F........ B12059C,
2.25
INN.E BG00a15W, OE l--
O0 2.20 2 15
--
-
.
E 0
22.10 0
_
0
2
4
6
8
10
12
14
16
18
20
t Oxidation Time (weeks) 175"C
200WC
Figure 1. TIme-Dependant Oxidation Behavior of used CANDUFuels
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