ML032471712

Technical Specifications for Amendment No. 250, Revised Spent Fuel Pool Loading Pattern

ML032471712
Person / Time
Site:	Arkansas Nuclear
Issue date:	09/03/2003
From:	Alexion T NRC/NRR/DLPM/LPD4
To:	Anderson C Entergy Operations
Alexion T W, NRR/DLPM, 415-1326
Shared Package
ML032461506	List: ML032461501 ML032471712
References
TAC MB9758
Download: ML032471712 (9)

Text

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REFUELING OPERATIONS FUEL STORAGE LIMITING CONDITION FOR OPERATION 3.9.12.a Storage Inthe spent fuel pool shall be restricted to fuel assemblies having initial enrichment less than or equal to 4.55 +/- 0.05 wlo U-235. The provisions of Specification 3.0.3 are not applicable.

3.9.12.b Storage In the spent fuel pool shall be further restricted by the limits specified In Figure 3.9.2. The provisions of Specification 3.0.3 are not applicable.

3.9.12.c The boron concentration Inthe spent fuel pool shall be maintained (at all times) at greater than 2000 parts per million.

APPLICABILITY: During storage of fuel in the spent fuel pool.

ACTION:

Suspend all actions involving the movement of fuel Inthe spent fuel pool If it Is determined a fuel assembly has been placed in an Incorrect location until such time as the correct storage location is determined. Move the assembly to Its correct location before resumption of any other fuel movement.

Suspend all actions Involving the movement of fuel Inthe spent fuel pool If It Is determined the pool boron concentration is less than 2001 ppm, until such time as the boron concentration is increased to 2001 ppm or greater.

SURVEILLANCE REQUIREMENTS 4.9.12.a Verify all fuel assemblies to be placed Inthe spent fuel pool have an initial enrichment of less than or equal to 4.55 +/- 0.05 wlo U-235 by checking the assemblies' design documentation.

4.9.12.b Verify all fuel assemblies to be placed in the spent fuel pool are within the limits of Figure 3.9.2 by checking the assemblies' design and bumup documentation.

4.9.12.c Verify at least once per 31 days the spent fuel pool boron concentration Is greater than 2000 ppm.

ARKANSAS - UNIT 2 3/4 9-14 Amendment No. 43.,478,224, 250

Figure 3.9.1 Deleted ARKANSAS - UNIT 2 3/4 9-15 Amendment No. 4&,250

Figure 3.9-2 Pattern I BC BC Pattern2 F x Pattern 3 F CC BC BC X F cc lccI orA orA Pattern 4 Fc C Pattern 5 B C C Fc C C Legend:

1. Type 7F' - fresh fuel assemblies with an initial enrichment less than or equal to 4.55+/-0.05 wt%.

2. Type "BT - an assembly with a maximum Initial enrichment of 4.1 wt%, a minimum burnup of 11.3 GWD/IMTU and zero years cooling time.

Typically "B"type assemblies have only one cycle of bumup.

3. 'Fc' - fresh fuel assemblies with an initial enrichment of less than or equal to 4.55+/-0.05 wt% with a CEA Inserted. The CEA must be of the new design.

4. "A' - an assembly that meets specific bumup requirements that are Included InTable 1 below.

5. "BC" - a "B" type assembly with a CEA inserted. This CEA may be of the old or new design.

6. 'C"- a high bumup assembly that meets specific bumup requirements that are included in Table 2 below. Initial enrichment Is less than or equal to 4.50+/-0.05 wt%.

7. "AC" - an WA" type assembly with a CEA Inserted. This CEA may be of the old or new design.

8. "CC"- a "C"type assembly with a CEA inserted. This CEA may be of the old or new design. Iitial enrichment Is less than or equal to 4.50+/-0.05 wt%.

9. "X - a water cell with no fuel.

Note: Any less restrictive assembly may be substituted for another assembly within the pattem. Fuel assembly types are ranked I through 9, with the highest reactivity ranking being 1.

ARKANSAS - UNIT 2 3/4 9-16 Amendment No. 4;.,48, 250

Figure 3.9-2 Allowable Pattern Interfaces Pattern I BC BC F X Pattern 2 orA or Al BC BC X F orA orA _

l CC Pattern 3, Alternate cICCI CC ElFc lC lPattern4 C Fc II FgB 1 Pattem 5 lI B C1 1 atm ARKANSAS - UNIT 2 3/4 9-17 Amendment No. 250

Figure 3.9-2 Allowable Pattern Interfaces Pattern 2 X F CC CC Pattern 3,Alternate Alternate [

F X l F. CC EI lCC F Pattern 3, Alternate CC CC l Fc lC lPattern4 llC lFc l I [

I II FC 7 Pattemr 5,Atemate Pattern 4,Alternate ARKANSAS - UNIT 2 3/4 9-18 Amendment No. 250

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1  !. c Figure 3.9-2 Allowable Pattern Interfaces I

Pattern 3 F cc Fc C Pattern 4 I

CC CC I I

I I

I C I l C l Pattern 5, Altemate I B C I

I C Fc Pattern 4, Pattern 5 Alternate Fc C q Pattern 5, Altemate I 5,

~~~~Pattern ,Alternate ARKANSAS - UNIT 2 314 9-19 Amendment No. 250

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k' - 11%

Figure 3.9-2 Table 1 Minimum Bumup Requirements for WAAssemblies at Varying Enrichment and Cooling Time BURNUP, MWD1KgU Average 0 Years 5 Years 10 Years 15 Years 20 Years Enrichment, Cooling lime Cooling Time Cooling Time Cooling Time Cooling Time wt% U-235 2 7.56 7.56 7.56 7.56 7.56 2.5 14.94 14.21 13.47 12.74 12.00 3.0 21.30 20.30 19.30 18.30 17.30 3.5 27.10 25.95 24.80 23.65 22.50 4.0 32.67 31.38 30.09 28.79 27.50 4.5 39.30 37.73 36.15 34.58 33.00 4.95 45.00 43.33 41.65 39.98 38.30 Table 1-1 Bounding Polynomial Fits to Determine Minimum Acceptable Bumup for WKType Assemblies Storage as a Function of Initial Enrichment Decay Time, Bumup, MWDIKgU Years 0 0.68

• E3 - 7.449

• E2 + 38.56

• E - 45.20 5 0.5489

• E3 - 5.9344

• E2 + 32.496

• E - 38.05 10 0.4153

• E3 -4.3948* E2 + 26.356

• E -30.75 15 0.2867

• E3 - 2.9045

• E2 + 20.367

• E - 23.80 20 0.153

• E 3 -1.3649

• E2 + 14.227

• E - 16.60 Note: E = Initial average enrichment in wt%oU-235 ARKANSAS - UNIT 2 314 920 Amendment No. 250

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Figure 3.9-2 Table 2 Minimum Bumup Requirements for uC" Assemblies at Varying Enrichment and Cooling lime BURNUP, MWD/KgU Average 0 Years 5 Years 10 Years 15 Years 20 Years Enrichment, Cooling Time Cooling Time Cooling Time Cooling Time Cooling Time wt% U-235 2 17.00 15.00 14.00 13.30 13.00 2.5 25.00 22.00 21.00 20.30 20.00 3.0 32.00 29.00 27.00 26.00 25.00 3.5 37.00 35.00 32.50 31.00 30.00 4.0 43.00 40.00 39.00 38.00 37.00 4.5 49.75 46.00 45.00 44.00 43.00 Table 2-1 Bounding Polynomial Fits to Determine Minimum Acceptable Bumup for 'C" Type Assemblies Storage as a Function of Initial Enrichment Decay Time, Bumup, MWD/KgU Years 0 1.3148

• E3 - 13.552

• E2 + 57.491

• E - 53.6 5 0.3704* E 3 -4.5397" E2 + 29.59

• E-28.8 10 0.6667

• E3 - 6.5714 E2 + 32.976 E -30.3 15 0.7111

• E3 -6.919

• E2 + 33.634

• E -31.3 20 0.8148

• E3 - 7.7302

• E2 + 35.169

• E -32.0 Note: E = Initial average enrichment in wt% U-235 ARKANSAS - UNIT 2 3/ 9-21 Amendment No. 250

4' 4 DESIGN FEATURES 5.3 Fuel Storage 5.3.1 Spent Fuel Storaae Rack Criticality The spent fuel storage racks are designed and shall be maintained with:

a. Fuel assemblies stored in the spent fuel pool In accordance with Specification 3.9.12;

b. kff

• 0.95 If fully flooded with 240 ppm borated water, which includes an allowance for uncertainties as described InSection 9.1 of the SAR; and

c. kff < 1.0 if fully flooded with unborated water, which includes an allowance for uncertainties as described in Section 9.1 of the SAR; and

d. A nominal 9.8 Inch center to center distance between fuel assemblies placed in the storage racks.

5.3.2 New Fuel Storage Rack Criticality The new fuel storage racks are designed and shall be maintained with:

a. Fuel assemblies having a maximum U-235 enrichment of 4.55+/-0.05 weight percent;

b. kff

• 0.95 if fully flooded with unborated water, which includes an allowance for uncertainties as described in Section 9.1 of the SAR;

c. kff < 0.98 if moderated by aqueous foam, which includes an allowance for uncertainties as described in Section 9.1 of the SAR; and

d. A nominal 26 inch center to center distance between fuel assemblies placed in the storage racks.

5.3.3 Drainage The spent fuel storage pool is designed and shall be maintained to prevent inadvertent draining of the pool below elevation 399' 101 AS.

5.3.4 Capacity The spent fuel storage pool is designed and shall be maintained with a storage capacity limited to no more than 988 fuel assemblies.

ARKANSAS - UNIT 2 5-2 Amendment No. 24,74,5,4.7,484,205,250