ML20236G105
| ML20236G105 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 10/28/1987 |
| From: | Papanic G YANKEE ATOMIC ELECTRIC CO. |
| To: | Fairtile M NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM), Office of Nuclear Reactor Regulation |
| References | |
| TASK-03-07.B, TASK-3-7.B, TASK-RR FYR-87-112, NUDOCS 8711020420 | |
| Download: ML20236G105 (9) | |
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b Telephone (617) 872-8100 TWX 710-380-7619 YANKEE ATOMIC ELECTRIC COMPANY 1671 Worcester Road, Framingham, Massachusetts 01701 October 28, 1987 FYR 87-112 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 j
Attention:
Mr. Morton Fairtile, Project Manager Project Directorate I-3 Division of Reactor Projects I/II Refebences:
(a) License No. DPR-3 (Docket No. 50-29)
(b) Letter, NRC to YAEC (NYR 87-141), dated July 16, 1987 (c) Letter, YAEC to NRC (FYR 87-99), dated September 18, 1987
Subject:
SEP Topic III-7.B Design Codes, Design Criteria, and Load Combinations
Dear Mr. Fairtile:
Your letter of July 16, 1987, which contained the Topic III-7.B Safety Evaluation Report, identified an open item regarding the vapor container column-to-shell connection. As requested, this connection'has been evaluated for the simultaneous application of dead, ambient thermal, LOCA pressure, LOCA temperature, and three-directional NRC spectra seismic loads. The evaluation is attached.
The staff requested that this analysis be performed because the containments for all other SEP Group II plants had been, likewise, evaluated.
As anticipated, our analysis concludes that this column-to-shell connection is adequate to sustain the combination of seismic and LOCA loads.
This submittal contains all of the information necessary to complete your review.
Should you have additional questions, please call.
Very truly yours, YANKEE ATOMIC EL TRIC COMPANY
- A.co a[-<im 4
G. Papatic, Jr.
7 Senior Project Engineer GP/25.216 Licensing Attachment 8711020420 871028-ADOCK 0 % O g!
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. Summary of' Evaluation of UC Column-to-Shell Connection r
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-Issue Summary Evaluate the adequacy of.the. Vapor Container.(VC) column-to-shell connection Lfor the simultaneous application of dead, environmental thermal, LOCA thermal, LOCA' pressure, and three-directional (3-D) NRC spectra loads.
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References
^
91 1.
.Cygna Calculations'86064/1/F, Sets L and P
. 2.
Letter, MRC to YAEC (NYR'82-226),
Subject:
SEP Topic III-6,' Staff Guidelines for Seismic Evaluation Criteria for the SEP Group II Plants,'
Revision'1,' dated-September 20, 1982
'3.
Seismic Re-evaluation'and Retrofit Criteria, DC-1, Revision 4-Responses The following temperatures and. pressures are used in the evaluation:
Reference. Temperature = 700F Maximum Recorded Temperature at Plant = 890F-l LOCA' Temperature Inside VC = 2490F fLOCA Pressure Inside VC =:31.5 psi A shell model.(Figure 1) which consists ofL1/16 section of the'VC was
~
' developed to calculate the local and weld stresses of the column-to-shell l
connection.. The column adjacent to the connection was modeled'with'shell elements. Away from the connection,'the column and beams were modeled with
- beam elements.
Under LOCA-thermal and pressure loads,. symmetric boundary
. conditions (no. displacement in the tangential direction andino rotation about the vertical:and radial directions) were imposed at the edge nodes of the VC sphere.
L l
.The conniction forces due to dead, environmental thermal, and 3-D NRC spectra loads were' calculated using the model shown in Figure 2.
The connection
' forces shown below are the enveloped. forces of the four columns which are located along the north-south and east-west cxes. The reason these four columns were selected is that their element axes coincide with the radial and tangentiul axes.of the VC shell.
Because of the nearly symmetrical nature of the VC, the' forces developed in all 16 columns are similar. Therefore, the enveloped forces of these four columns are conservative when compared'with the forces developed in the individual columns. The enveloped connection forces
- are:
DL + Env. Thermal 3-D NRC Radial Force 4.8 kips 26.1 kips Tangential Force-0.1 kips 129.2 kips Vertical Force 200.0 kips 104.0 kips Moment'About Radial Axis 0.5 in-k 24.0 in-k
~'
Moment About Tangential' Axis 634.0 in-k 12.0 in-k i
Moment About Vertical Axis 0.5 in-k 184.0 in-k
. L i
L
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Summary of Evaluation of VC Column-to-Shell Connection
['
(Continued)
L.
]
I To calculate the shell stress under the above connection forces, different boundary conditions than those previously stated were used to' study the VC response under unsymmetrical loadings. 'Because the radial and vertical forces and moments can be developed in the edge nodes of the 1/16 VC shell (Figure 1), these nodes were assumed to be fixed. A parametric study was
- performed to investigate the'effect of the assumed boundary conditions.
The pinned' edge condition'(instead of fixed) introduces insignificant change in i
the shell stress adjacent to the column connection.
The stress results of the LOCA. thermal, LOCA pressure, dead load, and environmental thermal loads were combined using the algebrale sum method.
The stress results of the 3-D NRC load were combined with remaining stresses using the absolute sum method.
i The allowable stresses for the VC shell are as follows:
Pm i lessor of 2.4 Sm or 0.7 Su = 42 kai Pm + Pb 1 lessor of 3.6 Sm or 1.05 Su = 63 ksi Wheret i
Pm = General Primary Membrane Stress Intensity Pb = Primary Bending Stress Intensity Sm = Allowable' Stress Intensity at 2490F = 19.2 ksi Su = Ultimate Tensile Strength at 2490F = 60 kai The allowable stresses conform to the requirements of the SEP guidelines and DC-1, Revision 4.
As shown in Figure 3, the maximum membrane stress intensity in the mid-section of the shell elements (15.7 ksi, Element 100) is less than the allowable j
stress-(42 kai). As shown in Figure 4, the maximum membrane'plus bending
']
stress' intensity of the shell elements (27.5 ksi, Element 190) is less than s
the allowable stress (63 kai).
j 1
The typical welded connection between the column and shell is a 7/8" full i
penetration weld reinforced with a 3/8" fillet weld.
Therefore, the weld is I
stronger than the base metal (the thickness of the column shell is 7/8").
The allowable bending for the base metal is 0.75 F,y = 22.5 ksi. 'The allowable shear stress for the base metal is 0.4 Fy = 12 kai.
These allowable stresses j
are not increased by 1/3 because the seismic stresses are not the primary contributor.
From Figure 5, the maximum principal stress of the column shell (15.8 ksi, Element 337) is less than the allowable stress (22.5 ksi).
From Figure 6, the maximum shear stress in the column shell (10.1 ksi. Element 359) is less than the allowable stress (12 ksi).
L CONCLUSION I
The VC column-to-shell connection is adequate for the simultaneous application of dead, environmental thermal, LOCA thermal, LOCA pressure, and 3-D NRC spectra loads. - _ _ _ _ - _ - -
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