NG-10-0604, Core Operating Limits Report for DAEC Cycle 23 Operation

Core Operating Limits Report for DAEC Cycle 23 Operation

ML103560080
Person / Time
Site:	Duane Arnold
Issue date:	12/10/2010
From:	Costanzo C NextEra Energy Duane Arnold
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NG-10-0604
Download: ML103560080 (23)

Text

NEXTera EN ERGY6 DUN December 10, 2010 NG-10-0604 TS 5.6.5.d Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Duane Arnold Energy Center (DAEC)

Docket 50-331 License No. DPR-49

Subject:

Core Operating Limits Report for DAEC Cycle 23 Operation In accordance with the requirements of Duane Arnold Energy Center (DAEC) Technical Specifications Section 5.6.5.d, a copy of the Core Operating Limits Report (COLR) for Cycle 23 operation of the DAEC is enclosed.

If you have any questions regarding this matter, please contact Steve Catron, Licensing Manager at (319) 851-7234.

Christopher R. Costanzo Vice President, Duane Arnold Energy Center NextEra Energy Duane Arnold, LLC Enclosure cc:

Administrator, Region III, USNRC Project Manager, Duane Arnold Energy Center, USNRC Resident Inspector, Duane Arnold Energy Center, USNRC NextEra Energy Duane Arnold, LLC, 3277 DAEC Road, Palo, IA 52324 to NG-10-0604 DUANE ARNOLD ENERGY CENTER CYCLE 23 CORE OPERATING LIMITS REPORT 21 pages to follow

Revision 0 September 2010 Duane Arnold Energy Center Cycle 23 Core Operating Limits Report NExTera E N E RO("Y Q1

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Page 1 of 20

1.0 Core Operating Limits Report This Core Operating Limits Report for Cycle 23 has been prepared in accordance with the requirements of Technical Specification 5.6.5 and is applicable to operation for which rated thermal power is 1912 MWt. The core operating limits have been developed using NRC-approved methodology (Reference 1, as supplemented by References 6 and 7) and are established such that all applicable limits of the plant safety analysis are met. The Cycle 23 values for the core operating limits are provided in Section 3.0 of this report.

2.0 References

1.

General Electric Standard Application for Reactor Fuel (GESTAR-II), NEDE-24011 -P-A-16, October 2007.

2.

Supplemental Reload Licensing Report for Duane Arnold Energy Center, Reload 22 Cycle 23, 0000-0109-9269-SRLR Rev. 0, August 2010.

3.

Fuel Bundle Information Report-for Duane Arnold Energy Center, Reload 22 Cycle 23, 0000-0109-9269-FBIR Rev. 0, August 2010.

4.

Duane Arnold Energy Center Cycle 22 Core Operating Limits Report, Revision 1, September 2009.

5.

Duane Arnold Energy Center Asset Enhancement Program, Task T0201:

Power/Flow Map, GE-NE-A22-00100-04-01, Revision 0, February 2000.

6.

General Electric Licensing Topical Report ODYSY Application for Stability Licensing Calculations Including Option I-D and II Long Term Solutions, NEDE-33213P-A, April 2009.

7.

General Electric Report, Plant-Specific Core-Wide Mode DIVOM Procedure Guideline, GE-NE-0000-0031-6498-RO, June 6, 2005.

Page 2 of 20

3.0 Core Operating Limits 1

Average Planar Linear Heat Generation Rate (APLHGR) - TS 3.2.1

a. The Maximum APLHGR (MAPLHGR) applicable to all fuel types as a function of Planar Average Exposure (PAE) shall not exceed the limiting curves defined by Table 1, multiplied by the smaller of the two MAPFAC/LHGRFAC factors determined from Figures 3 and 4. Figure 1 plots the MAPLHGR curve corresponding to Table 1.

b. The Maximum Linear Heat Generation Rate (MLHGR) applicable to all fuel rods for all fuel types as a function of Peak Pellet Exposure (PPE) shall not exceed the curves defined by Table 2, multiplied by the smaller of the two MAPFAC/LHGRFAC factors determined from Figures 3 and

4. Figure 2 plots the MLHGR curve for UO2 fuel rods corresponding to Table 2.

c. During Single Loop Operation (SLO), the actual MAPLHGR applicable to all fuel types as a function of planar average exposure shall not exceed the limiting curves defined by Table 1, multiplied by the smaller of the two MAPFAC/LHGRFAC factors determined from Figures 3 and 5.

d.

During Single Loop Operation (SLO), the actual MLHGR applicable to all fuel rods for all fuel types as a function of peak pellet exposure shall not exceed the limiting curves defined by Table 2, multiplied by the smaller of the two MAPFAC/LHGRFAC factors determined from Figures 3 and 5.

The above MAPLHGR limits are from the Emergency Core Cooling requirements of the Loss-of-Coolant Accident (LOCA) analyses. The above MLHGR limits are from the fuel thermal-mechanical performance limits. The individual MAPLHGR and MLHGR limits, as discussed in the BASES for TS 3.2.1, are modeled in the process computer. The above can be used to determine the TS MAPLHGR or MLHGR limits in the event the process computer is not available.

2.

Minimum Critical Power Ratio (MCPR) - TS 3.2.2

a. The MCPR shall be equal to or greater than the Operating Limit MCPR (OLMCPR), which is a function of Core Thermal Power, Core Flow, Fuel Design Type (if multiple fuel design types are in the core), and Scram Time (Tau). For Core Thermal Power greater than or equal to 21.7% of rated and less than 40% of rated (21.7% < P < 40%), the OLMCPR is given by Figure 6. For Core Thermal Power greater than or equal to 40%

of rated (P > 40%), the OLMCPR is the greater of either:

i) The applicable flow-dependent OLMCPR determined from Figure 7, or ii) The appropriate Rated Power OLMCPR from Figure 8 or 9 [Figure 10 for Recirculation Pump Trip Out-of-Service (RPTOOS); Figure 11 for Turbine Bypass Valves Out-of-Service (TBVOOS); Figure 12 for TBVOOS and RPTOOS], multiplied by the applicable power-dependent OLMCPR multiplier determined from Figure 6.

Page 3 of 20

b. During SLO with Core Thermal Power greater than or equal to 21.7% of rated, the SLO OLMCPR is the greater of either:

i) adding 0.02 to the OLMCPR determined above, or ii) 1.38.

The above can be used to determine the TS OLMCPR limits in the event the process computer is not available.

4.0 Reload Fuel Bundles CYCLE FUEL TYPE LOADED NUMBER GE14-P1ODNAB438-12G6.0-1 OOT-150-T6-2541 21 36 GE14-P10DNAB410-16GZ-100T-150-T6-2919 21 16 GE14-P1ODNAB407-18GZ-100T-150-T6-2920 21 12 GE14-P1 ODNAB405-14GZ-100T-150-T6-3118 22 24 GE14-Pl ODNAB407-16GZ-10OT-150-T6-3119 22 24 GE14-Pl ODNAB409-16GZ-10OT-150-T6-3120 22 16 GE14-P10DNAB413-15GZ-10OT-1.50-T6-3121 22 16 GE14-PI1DNAB421-8G7.0/7G6.0-1 OOT-150-T6-3122 22 32 GE14-P1ODNAB438-12G6.0-10OT-1 50-T6-2541 22 40 GE14-P10DNAB421-14G7.0-1 OOT-150-T6-3301 23 16 GE14-P1ODNAB410-16GZ-1OOT-150-T6-3303 23 56 GE14-Pl ODNAB411-14G8.0-10OT-150-T6-3304 23 32 GE14-P1ODNAB397-15GZ-10OT-150-T6-3307 23 16 GE14-P10DNAB438-12G6.0-10OT-150-T6-2541 23 32 All Cycle 23 fuel types are of the GE14 fuel design type. Note that the bundle GE14-PIODNAB438-12G6.0-10OT-150-T6-2541 loaded in Cycle 23 is identical to the assembly of the same name that was loaded in Cycles 21 and 22.

5.0 Thermal-Hydraulic Stability

a. Continued reactor operation within the "Exclusion Region" on the power/flow map, as defined on Figure 13, is not permitted. (Surveillance Requirement 3.4.1.2)

b. Continued reactor operation within the "Buffer Region" on the power/flow map, as defined in Figure 13, is not permitted when the thermal-hydraulic stability monitor (SOLOMON) is not operational.

Please see References 6 and 7 for more information on Thermal-Hydraulic Stability.

Page 4 of 20

TABLE I Maximum Average Planar Linear Heat Generation Rate (MAPLHGR) Limit as a Function of Planar Average Exposure for All Cycle 23 Fuel Types Planar Average MAPLHGR Exposure Limit (GWdlST)

(kWIft) 0.00 12.82 19.13 12.82 57.61 8.00 63.50 5.00 Page 5 of 20

TABLE 2 Maximum Linear Heat Generation Rate (MLHGR) Limit as a Function of Peak Pellet Exposure for All Cycle 23 Fuel Types Peak U0 2 Pellet MLHGR Exposure Limit GWD/MT (GWD/ST) kW/ft 0(0) 13.4 16.0 (14.51) 13.4 63.5 (57.61) 8.0 70.0 (63.50) 5.0 2% Gd 2O3 Rods Peak 0% Zone Peak 2% Zone Pellet MLHGR Pellet MLHGR Exposure Limit Exposure Limit GWD/MT (GWD/ST) kW/ft GWD/MT (GWD/ST) kW/ft 0 (0) 12.800 0 (0) 13.093 15.284 (13.865) 12.800 13.722 (12.448) 13.093 60.657 (55.027) 7.642 61,377 (55.680) 7.816 66.866 (60.660) 4.776 67.898 (61.596) 4.885 Page 6 of 20

TABLE 2 (continued) 6% Gd2O3 Rods Peak 0% Zone Peak 6% Zone Pellet MLHGR Pellet MLHGR Exposure Limit Exposure Limit GWD/MT (GWD/ST) kW/ft GWDIMT (GWD/ST) kW/ft 0 (0) 13.100 0 (0) 12.255 15.642 (14.190) 13.100 13.532 (12.276) 12.255 62.078 (56.316) 7.821 60.625 (54.998) 7.316 68.433 (62.081) 4,888 67.069 (60.844) 4.572 7% Gd 203 Rods Peak 0% Zone Peak 7% Zone Pellet MLHGR Pellet MLHGR Exposure Limit Exposure Limit GWD/MT (GWD/ST) kW/ft GWD/MT (GWD/ST) kW/ft 0(0) 13.200 0(0) 12.000 15.761 (14.298) 13.200 13.419 (12.174) 12.000 62.552 (56.746) 7.881 60.174 (54.589) 7.164 68.955 (62.555) 4.925 66.572 (60.393) 4,478 8% Gd 20 3 Rods Peak 0% Zone Peak 8% Zone Pellet MLHGR Pellet MLHGR Exposure Limit Exposure Limit GWD/MT (GWD/ST) kW/ft GWD/MT (GWD/ST) kW/ft 0(0) 13.200 0(0) 11.755 15.761 (14.298) 13.200 13.315 (12.079) 11.755 62.552 (56.746) 7.881 59.761 (54.214) 7.018 68.955 (62.555) 4.925-66.117 (59,980) 4.386 Page 7 of 20

MAPLHGR vs Planar Average Exposure All Fuel Types (a

a)

CLa w 16

0) _

14.0 13.0 12.0 11.0 10.0 9.0 8.0 7.0 6.0 5.0 4.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 Planar Average Exposure (GWd/ST)

Figure 1 Page 8 of 20 70.0

MLHGR vs Peak Pellet Exposure All Fuel Types 14.0 13.0 12.0 110~

10.0 E w 9.0

3E.e (9

6.0 5.0 4.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 Peak Pellet Exposure (GWd/MT)

Figure 2 Page 9 of 20

Power Dependent MAPLHGR and MLHGR Multipliers 1.10 1

1 P 2:86.7%

1.00

____________J _________

0.90 C.).

n.,

"-J 0.

U-a-

0.80 0.70 25%5< P < 4400%

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-~________-.-.--Flow:550%

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21.7%:5 P < 26%

Flow 5 50%

26%

SV 00 Flow 40% s P < 86.7%

-~

I For P < 21.7% No Thermal Limits Required For 21.7% < P < 26% and F:5 50%

MAPFAC(p) = 0.550 + 0.01395 X (P - 26%)

LHGRFAC(p) = 0.550 + 0.01395 X (P - 26%)

For 21.7% -< P < 26% and F > 50%

MAPFAC(p) = 0.442 + 0.00837 X (P - 25%)

LHGRFAC(p) = 0.442 + 0.00837 X (P - 26%)

For 26% : P < 40% and F < 50%

MAPFAC(p) = 0.708 + 0.005286 X (P - 40%)

LHGRFAC(p) = 0.708 + 0.005266 X (P - 40%)

For 26%5 <P < 40% and F > 50%

MAPFAC(p) = 0.581 + 0.005786 X (P - 40%)

LHGRFAC(p) = 0.581 + 0.005786 X (P - 40%)

For 40% < P < 86.7%

MAPFAC(p) = 0.952 + 0.005225 X (P - 86.7%)

LHGRFAC(p) = 0.952 + 0.005225 X (P - 86.7%)

For P ->86.7%

MAPFAC(p) = 1.00 LHGRFAC(p) = 1.00 where:

P = Core Power in % of Rated F = Core Flow in % of Rated 0.60 1 0.50 0.40

< P < 40%

> 50%

j

.e' 21.7% !5 P < 26%

Flow > 50%

4 1~

0 10 20 30 40 50 60 70 80 90 100 Core Thermal Power (% rated)

Figure 3 Page 10 of 20

Flow Dependent MAPLHGR and MLHGR Multipliers 1.10 1.00 0.90 LL c-CL 0.80 0.70 0.60 0.50 0.40 0

10 20 30 40 50 60 70 80 90 100 110 Core Flow (% rated)

Figure 4 Page 11 of 20

Flow Dependent MAPLHGR and MLHGR Multipliers Single Loop Operation 1.10 1.00 0.90 0.80

-I 0.70 (L.

13-0.60 0-50 0.40 0

10 20 30 40 50 60 Core Flow (% rated)

Figure 5 70 80 90 100 110 Page 12 of 20

Power Dependent OLMCPR Limits and Multipliers (L

a.C.,

OJ 3.80 3.60 3.40 3.20 3.00 2.80 2.60 2.40 2.20 2.00 1.80 1.60 21.7% *P < 26%

ii~~..

Flow> 50%0%

21.7%6P26%

_i_21.7%<P.<2__%

Flow -0 50%

26%

P < 40%

Flw:

Flw0%5%

Note: Y-axis Numbers Represent (a)

OLMCPR(p) for 21.7% 5 P < 40%

(b)

K(p) for P Z: 40%

For P < 21.7% No Thermal Limits Required For 21.7% < P < 26% and F > 50%

OLMCPR(p) = 3.17 + 0.10465 X (26 - P)

For 21.7% < P < 26% and F 5 50%

OLMCPR(p) = 2.48 + 0.06977 X (26 - P)

For 26% 5 P < 40% and F > 50%

OLMCPR(p) = 2.03 + 0.01571 X (40 - P)

For 26% <P < 40% and F < 50%

OLMCPR(p) = 1.83 + 0.00929 X (40 - P)

For 40% 5 P < 45%

K(p) = 1.28 + 0.01340 X (45 - P)

For 45% <P < 60%

K(p) = 1.15 + 0.00867 X (60 - P)

For P e 60%

K(p) = 1.0 + 0.00375 X (100- P) where:

OLMCPR(p) = Power Dependent OLMCPR Umit K(p) = Power Dependent OLMCPR Multiplier P = Core Power in % of Rated F = Core Flow in % of Rated I-aC 1.40 1.20 1.00

~4

+

f-.

0 10 20 30 40 50 60 Core Thermal Power (% rated)

Figure 6 70 80 90 100 Page 13'of 20

Flow Dependent OLMCPR Limits 0,0.

1.60 1.55 1.50 1.45 1.40 1.35 1.30 1.25 1.20 1.15 1.10 0

10 20 30 40 50 60 Core Flow (% rated)

Figure 7 70 80 90 100 110 Page 14 of 20

OLMCPR vs Scram Time (Tau)

BOC to EOR - 1770 MWdlST Cycle Exposure Option B Option A 1.40 1

1.39 1.387 1.367 0

1.35 4-0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Tau Figure 8 Page 15 of 20

OLMCPR vs Scram Time (Tau)

EOR - 1770 MWdlST to EOC Cycle Exposure Option B Option A 1.43 1.42 1.41 0~

0...

1.40 1.39 1.38 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Tau 1.0 Figure 9 Page 16 of 20

OLMCPR vs Scram Time (Tau)

RPTOOS Option B Option A 1.64 -

1,62-1.60 1.58 1.56 0.

1-52 1.50 1.48 -L 1.46 -

1.44 0

0.0 0.1 0.2 0.3 0.4 0.5 0.5 0.7 0.8 0.9 1.0 Tau Figure 10 Page 17 of 20

OLMCPR vs Scram Time (Tau)

TBVOOS Option B Option A 1.471 1.46 1.45 -

0 1.44

-II 1.43 1.42-0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Tau Figure 11 Page 18 of 20

OLMCPR vs Scram Time (Tau)

TBVOOS & RPTOOS Option B Option A 1.68

[

1.64 1.60

-j0 1.52 1.48

.52 1.44 4_

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Ta u Figure 12 Page 19 of 20

DAEC Power/Flow Map Cycle 23 - 1912 MWth 110 100I Exclusion Region Buffer Region So -NOTE:

Continued operation above the 80 *--

MELLLA limit or beyond the core flow limit Is

[11 --

not alowed. Take action to exit the region IT L~II~I~

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Figure 13 35 40 45 50 55 Page 20 of 20