ML20155D797

Forwards Response to NRC 981002 RAI Re Modeling Spent Fuel Pool Heatup.Info Is Needed for NRC to Address Future Exemption Requests from Permanently Shutdown Plants in More Generic & Timely Manner

ML20155D797
Person / Time
Site:	Maine Yankee
Issue date:	10/28/1998
From:	Zinke G Maine Yankee
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GAZ-98-57, MN-98-67, NUDOCS 9811040029
Download: ML20155D797 (14)

Text

-

4 MaineYankee P.O. BOX 408

• WISCASSET, MAINE 04578 * (207) 882-6321 October 28,1998 MN-98-67 GAZ-98-57 UNITED STATES NUCLEAR REGULATORY COMMISSION Attention: Document Control Desk Washington, DC 20555

References:

(a) License No. DPR-36 (Docket No. 50-309)

(b) Letter: USNRC to M. J. Meisner; Request for AdditionalInformation For Modeling Spent Fuel Pool Heatup; dated October 2,1998 (c) Letter: M. J. Meisner to USNRC; Claim of Backfit " Generic Issue 82, Beyond Design Basis Accidents in Spent Fuel Pools"; dated February 17,1998

Subject:

Response to NRC Request for Additional Information For Modeling Spent Fuel Pool Heatup; Gentlemen:

In Reference (b), NRC requested additional information regarding our spent fuel pool and fuel assemblies in order for the NRC to address future exemption requests from permanently shutdown plants in a more generic and timely manner. Accordingly, Maine Yankee is providing this l [3 information to the NRC in attachment A to this letter.

ii Notwithstanding our backfit claim (Reference (c)) and associated correspondence, we are pleased to exchange information with the NRC for the purpose of supporting generic regulatory improvements or efforts on this topic. However, we do expect that, in accordance with 10 CFR 170.21, Note 4, the NRC costs or NRC contractor costs associated with these efforts will not be billed to Maine Yankee.

If you have any questions, please contact us.

/)UN Very truly yours, George A. Zinke, Direc or Nuclear Safety & Regulatory Affairs Attachments c:

Mr. H. J. Miller Mr. M. K. Webb Mr. M. Masnik Mr. R. Bellamy Mr. P. J. Dostie Mr. U. Vanags 9811040029 981028 a

PDR ADOCK 05000309 W

PDR s

L

~

ATTACHMENT A RESPONSE TO NRC REQUEST FOR ADDITIONAL INFORMATION REGARDING MODELING OF MAXIMUM FUEL TEMPERATURE FOLLOWING LOSS OF WATER IN THE SPENT FUEL POOL AT MAINE YANKEE Buildine 1

1.

Provide the spent fuel pool (SFP) building dimensions. Provide a N-S and a W-E profile view of the SFP building (a simple schematic is sufficient). In addition, identify which walls or portions of walls are exterior (i.e., in contact with the ambient environment).

Maine Yankee Response:

Building dimensions. About 49'-0" by 11l'-0" See height on Figure 1.

N-S and a W-E profile view of the SFP building. See Figure 1.

Exterior walls or portions of walls. See Figure 1.

2.

Provide the relative location of the SFP within the building (plan view of the building at the 44'6" elevation). Maine Yankee stated 6 ft as the distance from the pool edge to the SFP building walls on the E, S, and W sides of the pool. In addition, provide the dimensions of the j

stairwell and the fuel receipt bay.

1 Maine Yankee Response:

For the relative location of the SFP within the building (Plan view of the building at the 44'-6" elevation), see Figure 2.

The distance from the pool edge to the SFP building walls on the E, S, W sides of the pool is 6 feet.

For the dimensions of the stair well and the fuel receipt bay, see Figure 2. This stair well is open; there is no enclosure.

3.

Identify whether or not the new fuel storage area and the fuel receipt bay are covered to form a continuous floor at the 44'6" elevation.

Maine Yankee Response:

The NFSA floor is covered with 1/4" thick diamond steel plate. The fuel receipt bay (NFRA) is open at the 44'-6" level.

4.

Provide the thickness and material of construction of the pool liner.

Maine Yankee Response:

The pool liner is 0.25 inch stainless steel.

Page A-1

4 ATTACHMENT A RESPON,SE TO NRC REQUEST FOR ADDITIONAL INFORMATION REGARDING MODELING OF MAXIMUM FUEL TEMPERATURE FOLLOWING LOSS OF WATER IN THE SPENT FUEL POOL AT MAINE YANKEE 5.

Provide the air flow rate through the 44' 6" elevation level of the SFP building.

Maine Yankee Response:

2,000 to 12,000 cfm designed 6.

Provide a schematic that shows the elevation and position of the ventilation system vents servicing the 44' 6" level. In addition, identify whether there is an air inlet vent to the building or if an air inlet is provided via building leakage.

Maine Yankee Response:

See Figure 3. There is an air inlet vent to the building.

Racks 7.

Referring to Figure 6-1 of Reference 1 (MYAPC Letter to USNRC dated April 13,1998, MN-98-27), the top of Figure 6-1 indicates the Boral panel has a " clad" and is attached to the cell wall via a " sheath." Identify whether or not the " clad" and " sheath" are made of aluminum and stainless steel, respectively. If not, describe the material of construction.

Maine Yankee Response:

The clad is a 1100 series Al skin as part of the boral composition, the sheath is a stainless steel compartment.

8.

Referring to Figure 6-2 of Reference 1 (MYAPC Letter to USNRC dated April 13,1998, MN-98-27), confirm whether or not the cell to cell pitch is the same in all directions. In either case, identify what the pitch is. In addition, identify whether or not the gap (flex trap) exists on all four sides of a cell.

Maine Yankee Response:

The cell to cell pitch is the same in all directions: 10.50 inches. The gap (flux trap) does exist on all four sides of a cell.

9.

Identify any lateral flow holes that exist on the sides of the cans. If they do exist, identify the number of holes and where they are located.

Maine Yankee Response:

Four (4) flow holes exist on the sides of the cans. They are located one on each side,1 1/4" diameter,7 3/8" down from the top of the can. There are other flow holes, such as on the top and the bottom of the cans.

10. Identify the base plate material and configuration for the Region I and Region 11 racks.

Page A-2

i 1

ATTACHMENT A

. RESPONSE TO NRC REQUEST FOR ADDITIONAL INFORMATION REGARDING MODELING OF MAXIMUM FUEL TEMPERATURE FOLLOWING LOSS OF WATER IN THE SPENT FUEL POOL AT MAINE YANKEE Maine Yankee Response:

The base plate for the Region I and Region II racks is SS 304L,1/4" thick, and an additional J

plate of SS 304L, %" thick where the rack feet are mounted.

I1. Provide the configuration of the lateral cell to cell connections for the Region I racks?

l Maine Yankee Response:

See Figure 4.

12. Provide the notation for identifying individual cell locations.

Maine Yankee Response:

See Figure 5.

Enl

13. Provide the diameter of the control rods and identify whether or not they are still in place within the assemblies. If they are in place within the assemblies, identify the individual assemblies or the percentage of assemblies still containing control rods for each batch.

Maine Yankee Response:

The diameter of the control rods is 0.950 inches. There are 168 control rods (CEA) stored in fuel assemblies in the SFP There are 1434 fuel assemblies in the SFP. These CEAs can be moved to any fuel assembly.

14. Describe how the configuration of an assembly changes for those assemblies with less than 176 active fuel rods. Referring to Table 2 column 3 of Reference 1 (MYAPC Letter to USNRC dated April 13,1998, MN-98-27), the number of active rods is given as 160,164,168,171, 172,176. Provide schematics depicting the various assembly configurations.

Maine Yankee Response:

Water filled rods or shim rods take the place of fuel rods for those assemblies with less than 176 active fuel rods. See Figure 6, Sheet Nos. I and 2 for schematics of the various assembly configurations.

15. Identify the fuel loading configuration within the individual racks and indicate the fuel by various batches or by ranges of decay heat loads.

Maine Yankee Response:

Fuel assemblics can be moved around in the SFP within the limits of Technical Specifications, thus this configuration can change anytime.

Page A-3

ATTACHMENT A RESPON.SE TO NRC REQUEST FOR ADDITIONAL INFORMATION REGARDING MODELING OF MAXIMUM FUEL TEMPERATURE FOLLOWING LOSS OF WATER IN THE SPENT FUEL POOL AT MAINE YANKEE

16. Provide the decay heat load for individual batches of fuel.

Maine Yankee Response:

See Table 1. Decay heat power levels, in megawatts (MW) for each batch of fuel, are provided for the date of 9/25/98 in the last column. Decay heat levels were calculated for van,ous points in time using Branch Technical Position ASB-9-2 with a 10% uncertainty.

l'7.

Provide a normalized axial decay heat profile that is representative of an assembly at Maine Yankee.

Maine Yankee Response:

See Table 2. The decay heat profile is approximately proportional to the axial burnup profile of the assembly. Table 2 shows bounding normalized axial profiles for specified assembly burnup ranges. These profiles are at or below the minimum relative burnups for the top and bottom four axial fuel nodes (each 5% increments in core height). Due to nomialization, this corresponds to maximum relative bumups for the core central region. This data will therefore provide a high peaked, core central axial profile for the specified burnup range.

18. Provide the following information for the control rods:

1 The material of construction and physical properties, and Maine Yankee Response:

The control rods are comprised of five Inconel rods each containing Boron Carbide pellets and silver-indium-cadmium. The Ag-In-Cd is located in the lower eight inches of each of the five rods. In the old CEA's, manufactured prior to the late 1980's, the middle finger does not have the Ag-In-Cd located in the lower eight inches; there are boron carbide pellets. The majority of the CEA is Inconel 625, the spider is 304 SST, the spring is 302 SST.

2 Whether or not they have a sheath or cladding.

Maine Yankee Response:

They have tubing made from Inconel 625.

19. Provide the emissivity of the control rods.

Maine Yankee Response:

The CEA fingers are.made from Inconel which emissivity varies with temperature between 0.55 and 0.78.

Page A-4

ATTACHMENT A TABLE 1 Maine Yankee Decay Heat Power Levels by Fuel Batch for 9/25/98 Page 1 of 2 AVERAGE BATCH POWER BATCH FUEL NO. OF WT./ASSY ENRICHMENT (%) RATIO TO U INITIAL - CYCLES - BURNUP AS OF 9/25/98 NO.

TYPE ASSYS KGU IN OUT U 0UT FISS PU(%) 1 2 3 4 5 (MWD /MT)

(MW) 0100010 A0 12 393.887

• 2.027

• 1.117

.984

.378 1

10611

.0062 0101010 816 56 358.295

• 2.407

• 1.346

.982

.397 1

11912

.0294 0102010 C0 2

395.219

• 2.944

• 2.271

.990

.261 1

6522

.0006 0103010 C12 1

368.196

• 2.957

• 1.934

.985

.365 1

10470

.0005 0104010 C16 1

358.808

• 2.957

• 1.945

.985

.364 1

10359

.0005 0100011 A0 57 393.993

• 2.023 *

.830

.977

.456 1 1A 15695

.0319 0101011 816 24 358.201

• 2.410

• 1.089

.977 450 1 1A - - -

15994

.0133 0102011 C0 22 394.659

• 2.947

• 2.090

.987

.317 1 1A - - -

8565

.0067 0103011 C12 35 367.985

• 2.950

• 1.716

.981

.417 1 1A 13330

.0158 0104011 C16 7

358.410

• 2.953

• 1.602

.979

.440 1 1A 14884

.0035 0110011 RF0 2

395.455

• 2.341 *

1. 735

.995

.145 1A 2769

.0006 0111011 RF0 2

395.323

• 1.938

• 1.511

.993

.210 1A 4316

.0009 5058

.0010 0112011 RF4 2

386.173

• 1.930

• 1.449

.992

.241 1A 5150

.0005 0113011 RF5 1

380.050

• 2.006

• 1.442

.992

.244 1A 15850

.0068 0110030 RF0 12 395.273

• 1.938 *

.789

.978

.451 1A 3 0111030 RF4 53 386.436

• 1.935 *

.776

.977

.454 1A 3 - - -

16223

.0311 18042

.0423

- 0200020 00 69 389.669

• 1.950 *

.715

.976

.466 2 - - - -

20434

.0006 0201020 E16 1

354.183

• 2.515

• 1.013

.973

.494 2 - - - -

29423

.0075 0200030 E16 12 353.782

• 2.517 *

.582

.962

.530 2 3 0201030 F0 28 389.028

• 2.887

• 1.026

.968

.540 2 3 24409

.0195 28842

.0080 0202030 F8 12 372.158

• 2.884 *

.810

.962

.554 2 3 29262

.0105 0203030 F12 16 363.271

• 2.884 *

.787

.9 2

.548 2 3 29696

.0394 0200040 E16 61 353.710

• 2.517 *

.575

.%1

.530 2 4 - - -

33193

.0088 0201040 F0 12 389.409

• 2.888 *

.647

.957

.585 2 3 4 - -

28070

.0006 0200050 E16 1

351.636

• 2.506 *

.623

.963

.528 2 5 28812

.0007 0200060 E16 1

352.289

• 2.524 *

.617

.963

.528 2 6 30476

.0008 0200070 E16 1

354.361

• 2.517 *

.554

.%1

.531 2 7 31865

.0008 0200080 E16 1

353.373

• 2.530 *

.522

.960

.532 2 8 33819

.0008 0200090 E16 1

354.368

• 2.517 *

.469

.958

.533 2 9 0200100 E16 1

353.516

• 2.518

• 466 958

.533 2 to - - -

33676

.0009 31944

.0112 0300050 G0 16 388.814

• 2.741 *

.595

.958

.576 3 4 5 - -

33035

.0027 0301050 G41 4

379.997

• 2.744 *

.552

.957

.568 3 4 5 33687

.0087 0302050 G42 12 380.382

• 2.738 *

.533

.956

.570 3 4 5 31461

.0303 0303050 H0 40 387.765

• 3.036 *

.770

.959

.586 3 4 5 2

31912

.0378 0400060 10 48 388.812

• 3.035 *

.775

.959

.586 4 5 6 35405

.0187 0401060 14 24 378.882

• 3.032 *

.633

.955

.585 4 5 6 - -

32726

.0366 0500070 JO 48 381.481

• 3.003 *

.713

.958

.577 5 6 7 - -

38235

.0034 0501070 J4 4

372.852

• 3.003 *

.520

.952

.579 5 6 7 34873

.0132 0502070 J8 20 363.991

• 3.003 *

.619

.955

.566 5 6 7 35509

.0416 0600080 KO 48 380.831

• 3.002 *

.631

.955

.582 6 7 8 38341

.0033 0601080 K4 4

371.499

• 3.004 *

.531

.952

.578 6 7 8 35685

.0136 0602080 K8 20 363.157

• 3.002 *

.603

.955

.567 6 7 8 39684

.0078 0700090 LO 8

379.564

• 3.288 *

.651

.951

.610 7 8 9 41717

.0114 0701090 L4 12 371.060

• 3.288 *

.5 73

.948

.606 7 8 9 35804

.0277 0702090 L8 40 362.447

• 3.288 *

.764

.955

.585 7 8 9 41988

.0035 0703090 L12 4

354.176

• 3.288 *

.552

.948

.587 7 8 9 - -

0700110 LO 8

379.415

• 3.288 *

.712

.953

.606 7 8 9 10 11 36536

.0051

• AS BUILT KGU AND ENRICHMENT

ATTACHMENT A TABLE 1

. Maine Yankee Decay Heat Power Levels by Fuel Batch for 9/25/98 Page 2 of 2 l

AVERAGE 8ATCH POWER l

BATCH FUEL No. OF WT./AS$Y ENRICMMENT (%) RATIO TO U INITIAL " CYCLES - BURNUP AS OF 9/25/98 NO.

TYPE AS$YS KGU IN OUT U 0UT FISS PU(%) 1 2 3 4 5 (MWD /MT)

(MW) l I'

0800090 M8 3

362.029

• 3.303 *

.960

.%0

.577 8 9 32218

.0028 0801100 M4 28 370.051

• 3.303 *

.648

.951

.601 8 9 10 39152

.0261 0802100 M8 28 361.453

• 3.302 *

.616

.950

.594 8 9 10 39543

.0206 0800110 M8 1

362.537

• 3.299 *

.411

.942

.593 8 9 11 46045

.0010 0800120 M8 1

362.544

• 3.300

• 408

.942

.593 8 9 12 47079

.0011 i

0800130 M8 1

361.651

• 3.304 *

.487

.945

.594 8 9 13 44257

.0011 l

0800140 M8 1

361.722

• 3.299 *

.476

.945

.594 8 9 14 43206

.0013 0800150 MO 8

378.931

• 3.301 *

.6%

.952

.607 8 9 10 15 36718

.0075 0801150 M8

.1 361.382

• 3.302 *

.638

.951

.592 8 9 15 38137

.0020 0900100 N8 8

369.564 *. 3.301

• 943

.959

.588 9 10 32305

.0076 0900110 N0 4

388.183

• 3.307 *

.602

.949

.627 9 10 11 40182

.0039 0901110 N4 24 378.365

• 3.303 *

.550

.947

.618 9 10 11 41781

.0240 0902110 N8 36 370.192

• 3.302 *

.603

.949

.607 9 10 11 39721

.0266 l

1000120 PO 20 389.140

• 3.502 *

.748

.950

.633 10 11 12 39592

.0186 l

1001120 P4 20 379.850

• 3.501 *

.559

.944

.629 10 11 12 45284

.0219

(

1002120 P8 16 370.907

• 3.500 *

.621

.946

.619 10 11 12 42939

.0143 l

1000130 P8 8

371.834

• 3.496 *

.582

.945

.619 10 11 12 13 43601

.0057 1000140 PO 8

389.811

• 3.502 *

.711

.949

.636 to 11 12 14 39401

.0062 1100120 04 4

380.873

• 3.694

• 1.131

.957

.617 11 12 34250

.0045 42355

.0300 1100130 00 28 390.712

• 3.690 *

.751

.947

.650 11 12 13 44040

.0309 1101130 Q4 32 380.545

• 3.693 *

.681

.945

.641 11 12 13 49241

.0097 l.

1102130 08 8

372.789

• 3.695 *

.524

.939

.632 11 12 13 l

1200140 R0 36 390.577

• 3.684 *

.826

.949

.647 12 13 14 39212

.0357 46028

.0153 1201140 R4 12 382.465

• 3.682 *

.581 941

.642 12 13 14 47923

.0272 1202140 R8 20 374.061

• 3.681 *

.520

.939

.632 12 13 14 40240

.0088 1200150 R4 4

381.497

• 3.681 *

.782

.948

.641 12 13 15 30052

.0053 1300140 SO 4

390.455

• 3.702

• 1.252

.960

.613 13 14 32739

.0200 1300150 SO 16 390.680

• 3.702

• 1.118

.957

.624 13 14 15 36864

.0495 1301150 S4 28 381.292

• 3.701 *

.925

.952

.632 13 14 15 40535

.0425 1302150 $8 20 372.285

• 3.702 *

.769

.948

.632 13 14 15 21222

.0168 1400150 TO 8

391.319

• 3.918

• 1.969

.971

.535 14 15 24838

.0617 1401150 T4 28 381.947

• 3.906

• 1.719

.966

.5 73 14 15 25643

.0792 1402150 T8 36 373.550

• 3.895

• 1.666

.965

.578 14 15 TSO

.0105 1500150 UO 8

390.342

• 3.742

• 2.956

.989

.275 15 9340

.0533 1501150 U24 32 389.643

• 3. 739

• 2.771 986

.333 15 9905

.0494 1502150 U48 28 389.498

• 3.740

• 2.723

.985

.354 15

• AS BUILT KGU AND ENRICHMENT l

_y g--

~ -

ATTACHMENT A TABLE 2 Ma.ine Yankee Bounding Normalized Axial Burnup Profiles vs. Core Height Maximum Burnups in Core Central Region Page1of1 This table provides bounding normalized axial bumup profiles for ranges in assembly average burnup. The bumup profiles approximate the expected decay heat profiles. These profiles may be used in conjunction with the assembly average bumups provided for each fuel batch. The profiles show a decrease in maximum peaking with increased bumup. Thus, use of the 8,000-12,000 mwd /Mt profile is conservative (i.e., higher axial peaking) for the burnup range from 12,000-16,000 mwd /Mt, which is not covered by the data.

Normalized Axial Bumup Profile for indicated Assembly Average Bumup hnge Axial Location

(% Height 8,000 to 16,000 to 24,000 to 36,000 to 44,000 to from Core 12,000 24,000 36,000 44,000 55,000 Bottom) mwd /Mt mwd /Mt mwd /Mt mwd /Mt mwd /Mt 97.5 0.365 0.399 0.542 0.612 0.638 92.5 0.612 0.658 0.787 0.862 0.878 87.5 0.815 0.875 0.954 0.985 0.993 3

82.5 0.955 1.008 1.025 1.038 1.040 77.5 1.139 1.128 1.093 1.076 1.069 72.5 1.164 1.144 1.103 1.083 1.075 67.5 1.167 1.151 1.107 1.084 1.075 62.5 1.168 1.151 1.106 1.082 1.074 57.5 1.170 1.152 1.105 1.081 1.072 52.5 1.173 1.151 1.104 1.080 1.071 47.5 1.177 1.151 1.102 1.078 1.069 42.5 1.181 1.151 1.101 1.077 1.068 37.5 1.186 1.152 1.100 1.076 1.067 32.5 1.192 1.152 1.100 1.075 1.066 27.5 1.196 1,153 1.100 1.074 1.065 22.5 1.183 1.151 1.098 1.071 1.063 17.5 1.023 1.039 1.041 1.042 1.040 12.5 0.908 0.946 0.989 1.009 1.008 7.5 0.740 0.784 0.863 0.895 0.910 2.5 0.485 0.507 0.583 0.623 0.654

ATTACHMENT A FIGURE 1

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ATTACIIMENT A FIGURE 3

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ATTACHMENT A FIGURE 5 Notation for Individual Cell Location l

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ATTACHMENT A FIGURE 6 SHEET No.1 2

Fuel Assembly Configurations i

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ATTACHMENT A FIGURE 6, SHEET No. 2 Fuel Assembly Configurations l

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00 000000 OO OO 000000 00 00000000000000 00000000000000 000000 000000 l

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00000000000000 00000000000000 00 000000 00 00 000000 00

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00000000000000 0 Shim Assembly IlG rod 5 l

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00000000000000 00 0 0 0 0'0 0 OO 00 000000 00 00009000090000 00000000000000 000000 000000 000000 000000 00000000000000 000000000@O000 OO 000000 OO OO 000000 00 00000000000000 00000000000000 l

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