ML041000277
| ML041000277 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 03/30/2004 |
| From: | Lavie S NRC/NRR/DSSA/SPSB |
| To: | |
| LaVie, Steve, NRR/DSSA/SPSB, 415-1081 | |
| References | |
| Download: ML041000277 (5) | |
Text
MathCad Worksheet TAC:
S.F. LaVie, NRR/DSSA/SPSB Catawba LOCA / LRA / REA Scaling Confirmation INITIALIZATIONS Ci 3.7 1010 sec 1 rem 100 erg gm Bq 1.0 sec 1 MWt 1.0 106 watt ORIGIN 1
uCi 1.0 10 6 Ci j
1 17 mrem 0.001 rem Sv 100 rem
=====================================================================
ST 1.09 Increase due to increased source term MOX over LEU GF 1.5 Increase due to increased gap fraction MOX over LEU LOCA -- All assemblies (193) are assumed damaged in a LOCA--189 LEU, 4 MOX For the EAB thyroid dose, the CLB dose D clb 89 rem D f D clb 193 4 ST GF D clb 189 193
=
D f 90.171 rem
=
D f D clb 101.316 %
due to 4 MOX due to LEU final dose increase For the LPZ thyroid dose, the CLB dose D clb 25 rem D f D clb 193 4 ST GF D clb 189 193
=
D f 25.329 rem
=
D f D clb 101.316 %
For the CR thyroid dose, the CLB dose D clb 5.3 rem D f D clb 193 4 ST GF D clb 189 193
=
D f 5.37 rem
=
D f D clb 101.316 %
LRA -- 21 assemblies are assumed damaged in a LRA--17 LEU, 4 MOX For the EAB thyroid dose, the CLB dose D clb 3.7 rem D f D clb 21 4 ST GF D clb 17 21
=
D f 4.148 rem
=
D f D clb 112.095 %
For the LPZ thyroid dose, the CLB dose D clb 1.2 rem D f D clb 21 4 ST GF D clb 17 21
=
D f 1.345 rem
=
D f D clb 112.095 %
scaling.MCD 3/30/1904 1
REA -- 97 assemblies are assumed damaged in a REA, 93 LEU, 4 MOX For the EAB thyroid dose, the CLB dose D clb 1.0 rem D f D clb 97 4 ST GF D clb 93 97
=
D f 1.026 rem
=
D f D clb 102.619 %
For the LPZ thyroid dose, the CLB dose D clb 0.1 rem D f D clb 97 4 ST GF D clb 93 97
=
D f 0.103 rem
=
D f D clb 102.619 %
The results above were calculated with the 9% increase projected by Duke based on an equivalent assembly. The staff believes that the CLB LEU inventory should have been used instead. The increase would have been 15.8%.
The doses are recalculated using the 1.158 multiplier.
ST 1.158 Increase due to increased source term MOX over LEU GF 1.5 Increase due to increased gap fraction MOX over LEU LOCA -- All assemblies (193) are assumed damaged in a LOCA--189 LEU, 4 MOX For the EAB thyroid dose, the CLB dose D clb 89 rem D f D clb 193 4 ST GF D clb 189 193
=
D f 90.359 rem
=
D f D clb 101.527 %
due to 4 MOX due to LEU final dose increase For the LPZ thyroid dose, the CLB dose D clb 25 rem D f D clb 193 4 ST GF D clb 189 193
=
D f 25.382 rem
=
D f D clb 101.527 %
For the CR thyroid dose, the CLB dose D clb 5.3 rem D f D clb 193 4 ST GF D clb 189 193
=
D f 5.381 rem
=
D f D clb 101.527 %
LRA -- 21 assemblies are assumed damaged in a LRA--17 LEU, 4 MOX For the EAB thyroid dose, the CLB dose D clb 3.7 rem D f D clb 21 4 ST GF D clb 17 21
=
D f 4.219 rem
=
D f D clb 114.038 %
For the LPZ thyroid dose, the CLB dose D clb 1.2 rem D f D clb 21 4 ST GF D clb 17 21
=
D f 1.368 rem
=
D f D clb 114.038 %
scaling.MCD 3/30/1904 2
REA -- 97 assemblies are assumed damaged in a REA--93 LEU, 4 MOX For the EAB thyroid dose, the CLB dose D clb 1.0 rem D f D clb 97 4 ST GF D clb 93 97
=
D f 1.03 rem
=
D f D clb 103.039 %
For the LPZ thyroid dose, the CLB dose D clb 0.1 rem D f D clb 97 4 ST GF D clb 93 97
=
D f 0.103 rem
=
D f D clb 103.039 %
Although the staff's results using the CLB LEU source term rather than the equivalent LEU assembly used by Duke are slightly higher, they confirm Duke's conclusion that the increased doses due to 4 MOX LTA remain acceptable.
scaling.MCD 3/30/1904 3
MathCad Worksheet TAC:
S.F. LaVie, NRR/DSSA/SPSB Evaluate impact of noble gas increases INITIALIZATIONS Ci 3.7 1010 sec 1 rem 100 erg gm Bq 1.0 sec 1 MWt 1.0 106 watt ORIGIN 1
uCi 1.0 10 6 Ci j
1 17 mrem 0.001 rem Sv 100 rem Read in nuclide database NUCLIDE.DAT.>>>>>
Re-assign arrays and assign units M
READPRN(
)
nuclide DCF dde M
5 rem Ci m3 sec n
M 1
F g M
8
======================================================================
Assign Deep dose DCF from nuclide file Source term of MOX and LEU assembly "Xe-133 Xe-133m Xe135 Xe135m C mox 1.0 106 3.34 104 4.12 105 2.38 105 Ci C leu 9.33 015 3.01 014 1.42 105 2.18 105 Ci DCF XE DCF dde8 DCF dde7 DCF dde10 DCF dde9 Set number of damaged assemblies
=
DCF XE 5.772 10 3 5.069 10 3 0.044 0.075 rem m3 Ci sec K loca 193 K lra 21 K rea 97 For each accident, calculate the pseudo dose due to release of noble gases from a core with 4 MOX LTAs; and release of noble gases from a LEU core; compare differences in pseudo dose. Note that these are not "real" doses as parameters (such as X/Q, decay, flow rates) that are the same for MOX or LEU are not included.
LOCA D mox C mox 4 C leu (
)
193 4
DCF XE 1.5
=
D mox 6.69 106 rem m3 sec D leu C mox 0 C leu 193 DCF XE 1.5
=
D leu 6.574 106 rem m3 sec
=
D mox D leu D leu 1.765 %
increases.mcd 3/31/1904 1
LRA D mox C mox 4 C leu (
)
21 4
DCF XE 1.5
=
D mox 8.313 105 rem m3 sec D leu C mox 0 C leu 21 DCF XE 1.5
=
D leu 7.153 105 rem m3 sec
=
D mox D leu D leu 16.222 %
REA D mox C mox 4 C leu (
)
97 4
DCF XE 1.5
=
D mox 3.42 106 rem m3 sec D leu C mox 0 C leu 97 DCF XE 1.5
=
D leu 3.304 106 rem m3 sec
=
D mox D leu D leu 3.512 %
These results confirm the adequacy of Duke's conclusion that the thyroid dose due to I-131 was an appropriate benchmark for their scaling of the previous UFSAR doses in establishing that the impact of the four MOX LTA on the LOCA, REA, and LRA is not significant.
increases.mcd 3/31/1904 2