ML20209C150

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Summarizes Results of Plant Annulus Structure Horizontal Response to Hosgri Seismic Input Analysis Discussed W/Nrc in Mar 1983.Drawing List,Drawings & Envelope Spectra for Each of Four Floors Encl
ML20209C150
Person / Time
Site: Diablo Canyon, 05000000
Issue date: 05/17/1983
From: Reich M
BROOKHAVEN NATIONAL LABORATORY
To: Kuo P
Office of Nuclear Reactor Regulation
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ML20209C072 List:
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FOIA-86-151 NUDOCS 8305270504
Download: ML20209C150 (9)
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BROCKHAVEN NADCNAL LAECUTOrw ASSCC!ATED uni'/ER$9ES. CC Structural Analysis Division

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U.S. Nuclear Regulatory Commission Bethes.da, MD 20014

Dear Dr. Kuo:

This letter report describes the work perfomed at BNL on the analysis of the horizontal response of the Diablo Canyon Annuls Structure to the Hosgri Seismic input.

The work was completed by the end of January 1983 and the results were presented during an open meeting at NRC o_n February 15, 1983.

The present letter report summarizes tihe results of the analysis discussed with you in March of 1983 when our activities pertaining to the task were considered completed.

The model of the containment annulus structure was developed from the model used for the vertical analysis and reported in NUREG/CR 2834.

The data used to develop the horizontal model were the drawings referenced in the NUREG report and additional material (see Table 1) obtained from PG&E Bechtel up to Janua ry 11, 1983.

The following changes were made to the vertical model:

(1) alI bracing members were added to the flcors (2) the crane wall was added to the model (3) the two pool ' alls spanning across the crane wall were added (4) a solid floor at elevation 140' was added inside of the crane wall (5) the mass of the equipment (steam generators, pressurizer, concrete walls, and polar crane) at elevation 140' level were added (6 ) the vertical displacements and the rotation about each of the horizontal axes (except for those nodes on the crane wall) were restrained.

The SAPV conputer program was used to detemine the first 40 mode shapes.

The frequencies ranged from 2.6 cps to 27.7 cps.

Two of the modes (i.e.,

those at 2.6 cps and 7.2 cps) were local in character and only involved a few members. Another two of the modes (17.7 cps and 18.1 cps) were shear beam e

L Dr. P. T. Kuo May 17,1983 response modes of the crane wall about its weak and strong axis respectively.

The reainder of the modes involve torsional deformation of the steel

' structure on the annulus region.

These modes involve rotation of the steel about the vertical axes.

The NEWMARK 7.5 M Hosgri Record was next used as input in both the east-west (X in the model) and north-south (Z in the model) direction.

Structural damping was taken to be 7%.

For each of the inputs, response spectra were generated for all nodes in the annulus steel in each direction.

Equipment damping was taken to be 2%.

Examples of maximum spectral acceleration are shown in Figures 1 and 2 for the first floor.

The peaks in Figure 1 result from input in the east-west (X-direction), while the peaks in Figure 2 result from input in the north-south (Z-direction).

The first number in the parameters is the peak spectral acceleration for the X-direction response at the node, while the 2nd number is the peak spectral acceleration for the Z direction response at the node.

Note that the peak spectral values on the crane wall are significantly lower than those on the annulus steel.

This clearly indicates that the flexibility of the annulus steel is important.

It is also important to note that input in one direction causes a significant response in the other direction.

This caes about because of the torsional modes in the annulus steel.

Figures 3 through 6 contain envelope spectra for each of the four floors.

The solid curves are spectra for the north-south (Z) response, while the dashed curves are spectra for the east-west (X) response.

The following procedure was used to generate these envelope spectra.

The X input and Z input disturbance each cause an X and Z direction spectra at a node.

The X spectra caused by X input is cmbined by the square root of the sun of the squares (SRSS), with the X spectra caused by the Z input.

This is done for all nodes on the floor. At each spectral frequency the peak acceleration of all of the nodes are plotted as the envelope value.

The same procedure is then used for obtaining the Z envelope.

Sincerely yours, Morris Reich, Head Structural Analysis Division 19 Attachments (2)

TABLE 1 Drawings and Other fiaterials for Horizontal Response Analysis of the Diablo Canyon Annulus Structure Obtained from PG8E up to January 11, 1983 Drawing Nos.

438232 Interior Concrete Outline Plans at El 74'-8" & 9'0" Rev. 10 Containment Structure 438233 Interior Concrete Outline Plans at El 124'-0" R ev. 12 8140'-0" Containment Structure 438234 Interior Concrete Outline-Main Sections Containment Rev. 12 Struct ure 438235 Interior Concrete Outline Miscellaneous Sections Rev 6 Containment Structure 438239 Interior Concrete Reinforcing Slab at El 91'-0" Rev. 5 NortK Containnent Structure Area F 438240 Interior Concrete Reinforcing Slab at Rev. 5 El 91'-0" South Containnent Structure Area G 438274 Interior Concrete Detalls Reactor Nozzles Rev. 4 Area Containaent Structure 438276 Detailed Plans at El 111 of Steam Generator Rev. 7 Supports Containment Structure 438278 Reactor Coolant Pump Supports at El 106 Rev. 5 Containnent Structure 438280 Pressurizer Support Containrent Structure Area F Rev. 4 439571 Equipaent Supports Plan Below El 113 Containment Rev. 8 Structure Areas F & G 439572 Layout of Lateral Support for Steam Generators Rev. 2 at El 139'-0" Structure Areas F & G 439573 Steam Generator Support at El 139'-0" Rev. 6 Containment Structure Areas F & G Addi tional It ems :

7175360 51 Series Vertical Steam Generator Outline Sheets 1 of 2 and 2 of 2 Bechtel #'s DC-663206-2 7-1 and DC-663206-1-10 Polar crane sketch Figure 2.1.1-4 (see BNL request to P.T. Kou dated November 1, 1982, Item 5) j Horizontal Newnark Hosgri 7.5 f t digitized time nistory for the Reactor Contain1ent Building (cards plus printed copy of cards).

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