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
TAC:
MathCad Worksheet S.F. LaVie, NRR/DSSA/SPSB Catawba LOCA / LRA / REA Scaling Confirm ation 10 1 erg 1 6 INITIALIZATIONS Ci 3.7. 10 . sec rem 100. Bq 1.0. sec MWt 1.0. 10 . watt 6 gm ORIGIN 1 uCi 1.0. 10 . Ci j 1 .. 17 mrem 0.001. rem Sv 100. rem
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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 clb 189 Df Df . 4. ST. GF D clb. D f = 90.171 rem = 101.316 %
193 193 D clb due to 4 MOX due to LEU final dose increase For the LPZ thyroid dose , the CLB dose D clb 25. rem D clb 189 Df Df . 4. ST. GF D clb. D f = 25.329 rem = 101.316 %
193 193 D clb For the CR thyroid dose , the CLB dose D clb 5.3. rem D clb 189 Df Df . 4. ST. GF D clb. D f = 5.37 rem = 101.316 %
193 193 D clb 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 clb 17 Df Df . 4. ST. GF D clb. D f = 4.148 rem = 112.095 %
21 21 D clb For the LPZ thyroid dose , the CLB dose D clb 1.2. rem D clb 17 Df Df . 4. ST. GF D clb. D f = 1.345 rem = 112.095 %
21 21 D clb 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 clb 93 Df Df . 4. ST. GF D clb. D f = 1.026 rem = 102.619 %
97 97 D clb For the LPZ thyroid dose , the CLB dose D clb 0.1. rem D clb 93 Df Df . 4. ST. GF D clb. D f = 0.103 rem = 102.619 %
97 97 D clb The results above were calculated with the 9% increase projected by Duke based on an equivalent assem bly. 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 m ultiplier.
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 clb 189 Df Df . 4. ST. GF D clb. D f = 90.359 rem = 101.527 %
193 193 D clb due to 4 MOX due to LEU final dose increase For the LPZ thyroid dose , the CLB dose D clb 25. rem D clb 189 Df Df . 4. ST. GF D clb. D f = 25.382 rem = 101.527 %
193 193 D clb For the CR thyroid dose , the CLB dose D clb 5.3. rem D clb 189 Df Df . 4. ST. GF D clb. D f = 5.381 rem = 101.527 %
193 193 D clb 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 clb 17 Df Df . 4. ST. GF D clb. D f = 4.219 rem = 114.038 %
21 21 D clb For the LPZ thyroid dose , the CLB dose D clb 1.2. rem D clb 17 Df Df . 4. ST. GF D clb. D f = 1.368 rem = 114.038 %
21 21 D clb 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 clb 93 Df Df . 4. ST. GF D clb. D f = 1.03 rem = 103.039 %
97 97 D clb For the LPZ thyroid dose , the CLB dose D clb 0.1. rem D clb 93 Df Df . 4. ST. GF D clb. D f = 0.103 rem = 103.039 %
97 97 D clb 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 LT A remain acceptable.
scaling.MCD 3/30/1904 3
TAC:
MathCad Worksheet S.F. LaVie, NRR/DSSA/SPSB Evaluate impact of noble gas increases 10 1 erg 1 6 INITIALIZATIONS Ci 3.7. 10 . sec rem 100. Bq 1.0. sec MWt 1.0. 10 . watt 6 gm ORIGIN 1 uCi 1.0. 10 . Ci j 1 .. 17 mrem 0.001. rem Sv 100. rem Read in nuclide database NUCLIDE.DAT.>>>>> M READPRN( nuclide )
Re-assign arrays and assign units 3
< 5 > . rem . m
<1> <8> DCF dde M n M Fg M Ci sec
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Assign Deep dose DCF from nuclide file Source term of MOX and LEU assembly DCF dde "Xe-133 6 5 1.0. 10 9.33 . 01 8 4 4 DCF dde Xe-133m 3.34 . 10 3.01 . 01 7 C mox . Ci C leu . Ci DCF XE 5 5 DCF dde 4.12 . 10 1.42 . 10 Xe135 10 5 5 2.38 . 10 2.18 . 10 DCF dde 9
Xe135m 3
5.772 10 Set number of damaged assemblies 3 3 5.069 10 rem. m DCF XE =
K loca 193 K lra 21 K rea 97 0.044 Ci. sec 0.075 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 param eters (such as X/Q, decay, flow rates) that are the same for MOX or LEU are not included.
LOCA 3
6 rem. m D mox C mox. 4 C leu . ( 193 4) . DCF .
XE 1.5 D mox = 6.69 10 sec 3
D leu C mox. 0 C leu . 193 . DCF .
XE 1.5 6 rem. m D leu = 6.574 10 sec D mox D leu
= 1.765 %
D leu increases.mcd 3/31/1904 1
LRA 3
5 rem. m D mox C mox. 4 C leu . ( 21 4) . DCF .
XE 1.5 D mox = 8.313 10 sec 3
D leu C mox. 0 C leu . 21 . DCF .
XE 1.5 5 rem. m D leu = 7.153 10 sec D mox D leu
= 16.222 %
D leu REA 3
6 rem. m D mox C mox. 4 C leu . ( 97 4) . DCF .
XE 1.5 D mox = 3.42 10 sec 3
D leu C mox. 0 C leu . 97 . DCF .
XE 1.5 6 rem. m D leu = 3.304 10 sec D mox D leu
= 3.512 %
D leu 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