ML020350481

Summary of Meeting with Amergen Energy Company, LLC, Enclosure 4, on Oyster Creek Nuclear Generating Station Concerning the Handling of Heavy Loads Over Irradiated Fuel

ML020350481
Person / Time
Site:	Oyster Creek
Issue date:	01/11/2002
From:	Pastis H NRC/NRR/DLPM/LPD1
To:	NRC/NRR/DLPM/LPD1
Pastis H, NRR/DLPM, 415-1261
Shared Package
ML020350586	List: ML020350476 ML020350481 ML020350530
References
Download: ML020350481 (19)

Text

Seismic Analysis of the Oyster Creek Reactor Building Stee I Superstructure And Modification Presenter: Swadesh C. Ramdeen, P.F.

Objective To present the seismic verification and modification of the reactor building steel superstructure for modification of the reactor building crane to single-failure-proof" in accordance with NUREG-0612 and NUREG-0554.

Purpose The reactor building steel superstruicture need to be re-analyzed for upgrade of the reactor building crane.

The Upgraded crane is a single-failure-proof I05-'T'on capacity crane. The original crane was a non-single failure-proof I00-Ton capacity crane.

This presentation does not include the seismic verification of the bridge and trolley, these were evaluated in a separate calculation.

Methodology Perform dead load, modal and response spectrum analysis of'the reactor building steel superstructure A finite element model of the entire RB steel structure wvas created with a simplified model of the crane and new trolley In the model the crane wheels are positioned at the location that produces the worst case stresses in the building structure The trolley is modeled at the worst case trolley location on the bridge (see slide)

Methodology continued:

A modal evaluation was perlormed. The program was set to deteimine 50 modes which excite the stricture into the rigidI range.

This resuLlts in approximately 98 to 99 % of mass participation in all three direction and the 47th mode exceeding 33 hertz.

Modal damping is 4% for OBE and 7% Ibr SSE in accordance with USNRC Regulatory Guide 1.61 Modal combinations are per USNRC Regulatory Guide 1.92 l*Response Spectrum evaluation is peerlormed by combining the 3 direction responses by the SRSS Method.

Load Combinations and Acceptance Criteria (1)DL + LL + OBE < Normal allowable stresses from AISC Spec.

(2) DL + LL + SSE < 1.6 x Normal allowable stresses from AISC Spec.

DL: Dead loads inlclu(ICS the building and crane structure, and crane hook load.

LL: Live load due to snow on the building roof OBE: Operating basis earthquake loads on the operating floor level which is the base of the steel superstructure SSE: Saie Shutdown Earthquake loads on the operating floor level which is the base of'the steel superstructure

Computer Program Used Computer and Structures, Inc. Program SAP2000 Plus Version 7.21 This is a linear finite element analysis program capable of perl'orming static, modal and response spectrum analysis.

This program was verified by EQE (the analysis vendor) under thcir quality assurance program

Results The liaximum interaction ratios for the various elements of'thc slcel superstructure:

Building (CoMPonent I)L + LL+ OBE < 1.0 DL+ LL + SSI, < 1.6 W 14 X 74 Coilumis 0.94 1.16 Colum1n Bracing 0.77 1.05 Crane Rail Giirder 0.96 1.15 Rool"Ilruss Cords 1.00 1.37 RooFl"rIuss Iricing 0.98 1.09 The mnaxiLmum-i computed displacements (NS, EW, VERTICAL) in inches relative to the operating floor:

lluildingl Co(in )Ollcnt i)L + LL+ OBE I)L+ LL + SSE R0o( flr ISS ,Ioinits 0.39, 0.44, 0.26 0.51, 0.64, 0.37 Crane Runway/lB1ridge 0.95, 1.07, 0.48 1.22, 1.45, 0.61

Results continued:

It was known that the clip connecting the rail girder to the building columns will require modification as such no stresses were computed for this component. The results of this activity are as follows:

1. The analysis results (force magnitude) confirms that the existing bent plate clip will be overstressed and a modifik-ation is required at each connection (total-- 14)

2. The calculated forces were used to design a modification

3. The modification was installed in July of 2000 The final details of the modification were reconciled in the building analysis.

Summary The modified reactor building super structure and reactor building crane rail girders are adequate for the Oyster Creek Safe Shutdown and Operating Bases earthquakes for a fully loaded crane with the trolley at any location on the crane bridge.

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