ML20138D797

Safety Evaluation Accepting BNL Hfbr Sf Storage Canal Conceptual Design for Impervious Liner

ML20138D797
Person / Time
Issue date:	04/28/1997
From:	NRC (Affiliation Not Assigned)
To:
Shared Package
ML20138D773	List: ML20138D766 ML20138D797
References
PROJECT-701 TAC-M98195, NUDOCS 9705010239
Download: ML20138D797 (3)

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l SAFETY EVALUATION BY THE 0ILQf 0F NUCLEAR REACTOR REGULATION  ;

l CIVIL ENGINEERINi_MD GEOSCIENCES BRANCH BROOKHAVEN HIGH FLUX BEAM REA:70R (HFBR) SPENT FUEL STORAGE CANAL CONCEPTUAL DESIGN FOR THE IMPERVIOUS LINER i TAC NO. M98195

1.0 BACKGROUND

Brookhaven National Laboratory (BNL) has submitted a report for the conceptual design for installing an impervious liner for its high flux beam reactor spent fuel pool. The submittal requests a Nuclear Regu7atory Commission (NRC) approval for the conceptual design.

2.0 EVALUATION AND DISCUSSION The report describes five options for liner assembly systems. These systems are described first and followed with an evaluation.

2.1 Systems Description Options A and B have two liners made of stainless steel plates with stiffeners provided between the outer and inner plates, and grout between the bottom of the outer liner plate and the top surface of the canal concrete floor. The annular space between the two liner plates is designed to drain to a sump for leak detection and recovery. Option A leaves the existing canal tiles in place, but option B removes the existing canal tiles and concrete setting.

The liners in option A have no lateral support except at the spent fuel pool top and at the bottom elevations. The outer liner in option B is laterally supported by the spent fuel pool concrete wall through the grout.

Options C and D have only one stainless steel liner plate with stiffeners and leak detection channels provided at the outer surface of the liner plate.

Grout is'provided between the bottom of the liner plate and the top surface of the canal concrete floor. Option C leaves the existing canal tiles in place, but option D removes the existing canal tiles and concrete setting. The liner in option C has no lateral support except for bearing against strip plates which are anchored to the spent fuel pool wall. The liner in option D is laterally supported by the spent fuel pool concrete wall through the grout.

Option E is similar to option C except that the existing canal tiles and concrete setting are removed and that the pool concrete surface is treated l

with waterproof cementitious material and/or an epoxy coating.

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ENCLOSURE 9705010239 970428 PDR ORG EUSDOE PDR a l

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2.2 Design Requirements The conceptual design of the liners is to conform with the requirements of the Department of Energy Orders, NRC regulations, American Nuclear Society Standard ANSI /ANS 57.2-1983, " Design Requirements for Light Water Reactor Spent Fuel Storage Facilities at Nuclear Power Plants," and the Suffolk County Sanitary Code.

i 2.3 Design Loads Design loads include (1) the dead load, the weight of the liner system and attachments, (2) the live load, the weight of water and fuel elements and structures in the canal, including racks, storage baskets, strike plate assembly, restraint structure, canal saw. etc., (3) seismic loads due to the safe shutdown earthquake (SSE), (4) thermal loads due to normal and accident water temperatures, (5) cask drop loads, and (6) containment test pressure.

2.4 Load Combinations Load combination includes (1) dead load plus live load, (2) dead load plus live load plus SSE, (3) dead load plus live load plus thermal load with normal water temperature, (4) dead load plus live load plus cask drop load, (5) dead load plus live load plus thermal load with normal water temperature, and  ;

(6) dead load plus live load plus SSE plus thermal load with accident water temperature.

2.5 Acceptance Criteria for Liner The acceptance criteria for the liner stress and strain are per ANSI /AISC N690-1994 with limitations specified in Appendix G of NUREG-1503.

2.6 Seismic Analysis The liner assembly will be designed as a seismic Category I structure. The I seismic induced loads include the inertial force of the liner assembly, hydrodynamic loads, and interface seismic loads from the fuel racks and other i attachments resulting from an SSE.

2.7 Evaluation l The BNL spent fuel pool is located in Suffolk County. The Suffolk County Sanitary Code requires a double walled storage facility or equivalent for all toxic or hazardous materials. Options A and B provide a double walled liner l storage facility, and therefore meet the Suffolk County Sanitary Code l requirement. Since options C and D do not provide a double walled storage facility, they do not appear to meet the Suffolk County Code requirement and should not be considered further. Option E provides a stainless steel liner and a waterproof concrete wall, and it meets the equivalent requirement of a double walled storage facility.

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-4 The' design loads identified in the report are appropriate for the liner design. The load combinations specified in the report are realistic and acceptable. The stated acceptance criteria for liners have been previously approved by the NRC. The planned seismic analysis for the liner is reasonable. ,

Based on the systems descriptions, proposed design requirements, and NRC i evaluation, options C and D do not appear to meet the Suffolk County Sanitary Code requirement while options A, B, and E do. Options A, B, and E can provide a double walled or equivalent system for retaining water in the spent fuel pool within the liner boundary and for collecting and detecting any water leaked out of the liner boundary should it occur.

3.0 CONCLUSION

The BNL submitted a conceptual design report for installing a liner including a leak detection system for the spent fuel pool of its high flux beam reactor located in Suffolk County, New York. The staff has reviewed the report and met twice with the applicant and its consultants. The review results indicate that options A, B, and E in the submittal meet the design requirements and' .

that the proposed design loads, load combinations, liner acceptance criteria, '

and seismic analysis are acceptable to the staff. The staff has concluded that the design concept proposed in the submittal is realistic and the construction of the liner based on the design is feasible.

Date: April 28, 1997 l

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