United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9611130129

                     Information & Support Services
                              P.O. Box 3707
                         Seattle, WA 98124-2207

November 4, 1996
G-1151-SJA-96-668

Document Control Desk
United States Nuclear Regulatory Commission
Washington, D.C. 20555

Reference:     a)   Boeing Letter G-1151-RSO-92-365 dated August 31,
                    1992; R. S. Orr to the NRC Operations Center

               b)   NRC Letter Docket No. 99901227 dated August 12, 1992;
                    L.J. Norrholm to R. S. Orr; Subject: Response to 10
                    CFR 21 Inquiry

Dear Sir or Madam:

In accordance with the reference correspondence and 10 CFR 21, Boeing is
sending the NRC the attached error notice(s) received from our former
software suppliers.  Because of unknown current addresses, the following
former customers were not notified:

     Reactor Controls, Inc.
     Echo Energy Consultants, Inc.
     Nuclear Applications and Systems Analysis Company (Japan)
     Nuclear Power Services
     Tenera Engineering Services
     Gibbs & Hill, Inc.
     Holtec International

Error notices have been sent to our other former customers.

Very truly yours,

Sandra J. Andrews
Nuclear Administrator
Phone: (206) 865-6248
FAX: (206) 865-4851
Mail Stop: 7A-33, or
e-mail: Sandra.Andrews @PSS.Boeing.com

Enclosure(s):  ANSYS Class3 Error Reports 96-42, 96-43, 96-44, 96-45,
               96-46
               ANSYS QA Notices QA96-09 and QA96-05R1
               ANSYS Support Coordinator Bulletin SCB96-01

ANSYS[Registered Trademark]

                         ANSYS, Inc.
                         201 Johnson Road         Telephone 412.746.3304
                         Houston, PA 15342-1300   Facsimile 412.746.9494

                         October 24, 1996

Dear Class3 Error Recipient:

     Enclosed you will find ANSYS Class3 Error Reports 96-42, 96-43,
96-44, 96-45 and 96-46.  Also, enclosed are ANSYS QA Notices QA96-09 and
QA96-05 R1.

     QA96-09 has been issued to alert users of SOLID62 and SOLID97 that
the normal component of the magnetic vector potential must be
discontinuous across material interfaces of differing permeability.

     QA96-05 R1 has been reissued to notify users of the full scope of
the error reported in QA96-05.  This error has been fully described in
Class3 Error Report 96-43 which is attached.

     Finally, enclosed is ANSYS Support Coordinator Bulletin SCB96-01.
It includes information pertaining to the ANSYS 5.3 Second Release and
known, non-Class3 errors in ANSYS Release 5.3.

     In the past year ANSYS has initiated the posting of all Class3
Errors and QA Notices on ANSYS's Internet Homepage whose address is
http://www.ansys.com.  Class3 Error Reports and QA Notices are located in
the ANSYS Zones section of the Homepage under Customer.  The username to
enter this area is "customer" and the password is "ain1fm" (ANSYS is
number 1 for me).  Since 1994, ANSYS has been providing error notices via
email to all customers with maintenance who have requested electronic
mailings.  These emails are transmitted and posted within 2 working days
of final approval of Class3 Error Reports and QA Notices.  We encourage
all of our customers to take advantage of these methods for quickly
obtaining Class3 Error Reports and QA Notices.  Beginning November 1,
1996 Class3 error notification mailings to customers with maintenance
will be performed on a quarterly basis.  If you require notification
sooner please make use of our Internet or email services.  To register
for email notification of Class3 errors, simply send an email request
including your email address, company name/address and ANSYS agreement
number to bpodolek@ansys.com.  Quality Assurance Service Agreement
customers are not affected by this change.

                                   Sincerely,

                                   ANSYS, Inc.

                                   William J Bryan
                                   Quality Assurance Manager

enclosures

    ANSYS [Registered Trademark] is a registered trademark of SAS IP

                                                  ANSYS, Inc.
                                        ISO 9001       UL        A3725

                                                  REGISTERED FIRM
                                             ISO CERTIFICATION INCLUDES
                                              ALL COMMERCIAL PRODUCTS

                  ANSYS Revision Identifier Description

     ANSYS revision identifiers consist of a major revision level, a
minor revision level, a correction level, and occasionally a special
version level.  An example of how this is constructed is shown below:

Figure omitted.

     Major revision level changes indicate that new features have been
added to the program and that some level of program architecture change
and/or file structure has occurred.  Minor revision level changes also
indicate that new features have been added to the program, but files are
upwardly compatible.  All known error fixes are included in both minor
and major revisions.  Changes to the correction level indicate that it is
primarily an error correction release.  Special version identifiers
indicate that one or more additional minor changes have been made to the
program, normally to circumvent an error.  Special versions are not
general release to all ANSYS licensees, since they typically represent
errors occurring only on one system, a subset of our customers who have
specific graphics devices, etc.

     The ANSYS revision identifier(s) shown under "corrected in" on the
front side of this Class3 Error Report indicates the first possible
revision that could contain the correction. A major program change needed
to fix an error can dictate that the next minor or major revision will
contain the fix rather than the next correction level.  For example, when
errors were being reported while Rev. 4.3A was the latest production
version, most class3 error reports indicated that 4.3B was the "corrected
in" revision.  Others requiring significant code restructuring were
reported as fixed in 4.4. Rev. 4.3B was never released, but Rev. 4.4
contained all error corrections noted as fixed in 4.3B.

     An identifier indicated under "corrected in" does not guarantee that
a general release of that revision of ANSYS will occur.  It does indicate
that the correction is known and implemented in the coding that would be
part of that general release.

                     Equivalent Product Identifiers

     The ANSYS family of products occasionally undergoes name changes
between revisions and/or changes in the functionality of derived products
(such as ANSYS-PC/LINEAR).  To minimize the potential for confusion in
these areas, the important product time equivalent (similar program
functionality and error content) an listed below.

     ANSYS/ED  contains all errors shown for      the full ANSYS product,
                                                  dancing at Rev. 5.0,
                                                  and beyond, unless
                                                  otherwise noted.

     PC/LINEAR is equivalent to                   WS/LINEAR at Rev.4-4A.
                                             and ANSYS/LINEAR starting at
                                                  Rev. 5.0.

     PC/THERMAL is equivalent to                  WS/THERMAL at Rev.4.4A
                                             and  ANSYS/THERMAL starting
                                                  at Rev. 5-0.

     PREPPOST contains relevant errors
     shown for                                    the full ANSYS product,
                                                  for included pre-
                                                  and postprocessing
                                                  functionality

            ANSYS [Registered Trademark] CLASS3 ERROR REPORT

                                                  ERROR NO: 96-42

KEYWORDS:      CONSTRAINT EQUATIONS     MODAL     ITERATIVE SOLVERS

DESCRIPTION OF ERROR:

     If a model contains constraint equations (CE command) at two or more
nodes of any single element, the results may be incorrect if one of the
following are true:

     1.   A modal analysis was performed (ANTYPOE, MODAL) using the block
          Lanczos method (MODOPT,LANB) or the subspace method
          (MODOPT,SUBSP) with the Frontal solver option (EQSLV,FRONT
          [default]) or the JCG solver option (EQSLV, JCG).

or   2.   An analysis was performed with the ICCG solver (EQSLV, ICCG).

or   3.   An analysis was performed with the JCG solver (EQSLV,JCG) in
          which the matrices were unsymmetric (such as in piezoelectrics,
          acoustics, and other multiphysics applications).

          Separate constraint equations typically occur when two
components are tied together using constraint equations (CEINTF cokand)
or with modal cyclic symmetry (MODCYC command).

FIRST INCORRECT VERSION(S):*_/          CORRECTED IN:*_/

Release 5.3                             Release 5.4
Component Products Release 5.3          Component Products Release 5.4

SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:

     If possible, replace the constraint equations with coupling, if the
meshes align.  Alternatively:

For  1.   Use the reduced method (MODOPT, REDUC) or the Power Dynamics
          method (MODOPT, SUBSP with EQSLV, PCG).

For 2 and 3.  Use the Frontal solver (EQSLV,FRONT).

COMMENTS:

     The correction, currently available upon request from your ASD,
fully accounts for the cross-coupling of all the constraint equations.
This may increase the wavefront by as much as a factor of 3.

     For modal analyses where there is insufficient memory to run with
this correction, an option is provided to allow it to solve with longer
run time.

     A similar correction will also be made for the block Lanczos method
and will be available at a later date to all customers through a
downloadable file from the ANSYS HomePage http://www.ansys.com/ServSupp/.

AUTHOR/CORRECTOR:                            DATE: October 22, 1996
                    John A. Swanson

REVIEWED BY QA:                              DATE: October 22, 1996
                    William J. Bryan

APPROVAL:                                    DATE: October 22, 1996
                    David Conover

            ANSYS [Registered Trademark] CLASS3 ERROR REPORT

                                                       ERROR NO: 96-43

KEYWORDS: MATRIX50       SUPERELEMENTS       COUPLED DEGREES OF FREEDOM
          NONZERO CONSTRAINTS

DESCRIPTION OF ERROR:

     Results are incorrect in a superelement (MATRIX50) use run if there
is coupling (CP, CPINTF commands) involving the superelement degrees of
freedom (DOF) and the following are true:

     1.   A nonzero constraint (D command) is applied to the coupled DOF:

and  2.   The nonzero constraint is not explicitly specified (e.g.,
          through a D command) on the superelement DOF of the coupled
          set.

FIRST INCORRECT VERSION(S):*_/               CORRECTED IN:*_/

Rev. 5.0                                     Release 5.4

SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:

     Apply the nonzero constraint at all the nodes of the coupled set.

COMMENTS:

     This Class3 Error Report details the error originally reported in QA
Notice QA96-05, which is superseded by this Class3 Error Report.

AUTHOR/CORRECTOR:                            DATE: October 22, 1996
                    David L. Conover

REVIEWED BY QA:                              DATE: October 22, 1996
                    William J. Bryan

APPROVAL:                                    DATE: October 22, 1996

                    Mark C. Imgrund

*_/If a product name is not included in the "first incorrect versions,
the full ANSYS program is implied.  For products not listed, this error
does not apply, but see the reverse side for equivalent product
designations.

Unless noted otherwise, this error report also applies to all revisions
after the first incorrect one and prior to the corrected revision.  All
revisions after "corrected in" are corrected.  Manual corrections are
included in on-tine documentation as appropriate.  Please see the reverse
side of this sheet for additional information on ANSYS revision
identifiers.

            ANSYS [Registered Trademark] CLASS3 ERROR REPORT

                                                          ERROR NO: 96-44

KEYWORDS:      SAVE      LOADS          INITIAL CONDITIONS       /EXIT

DESCRIPTION OF ERROR:

     Initial conditions applied with the IC command are not saved with
the default specified in the exit dialog box EXIT (Utility
Menu>File>Exit>Save Geom+Loads), or with the /EXIT, MODEL or /EXIT
Command.

FIRST INCORRECT VERSION(S):*_/          CORRECTED IN:*_/

Rev. 5.1                                Release 5.4
Component Products Rev.5.1              Component Products Release 5.4

SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:

     Select  from exit dialog box (or use /EXIT.ALL).

COMMENTS:

Note that initial conditions are saved if either the 
option (/EXIT,SOLU) or  option /EXIT.ALL) is selected
from the exit menu.  The SAVE command issued from the command line will
also save initial conditions.

AUTHOR/CORRECTOR:                       DATE:     October 22, 1996
                    Mike Normansell

REVIEWED BY QA:
                    William J. Bryan    DATE:     October 22, 1996

APPROVAL:           David Canover       DATE:     October 22, 1996

*_/If a product name is not included in the "first incorrect version",
the full ANSYS program is implied.  For products not listed, this error
does not apply, but see the reverse side for equivalent product
designations.

Unless noted otherwise, this error report also applies to all revisions
after the first incorrect one and prior to the corrected revision.  All
revisions after "corrected in" are corrected.  Manual corrections are
included in on-line documentation as appropriate.  Please see the reverse
side of this sheet for additional information on ANSYS revision
identifiers.

            ANSYS [Registered Trademark] CLASS3 ERROR REPORT

                                                       ERROR NO: 96-45

KEYWORDS: FASTSOLVER     EQSLV, ITER    LSSOLVE        RAMPING

DESCRIPTION OF ERROR:

     When using the LSSOLVE command with the fastsolver option active
(EQSLV,ITER) the surface and body force loads will erroneously be ramped
from zero for each load step instead of from the previous load step
values.

FIRST INCORRECT VERSION(S):*_/          CORRECTED IN:*_/

Release 5.3                             Release 5.4
Component Products Release 5.3          Component Products Release 5.4

SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:

Use a series of SOLVE commands instead of the LSWRITE and LSSOLVE
commands.

COMMENTS:

AUTHOR/CORRECTOR:                       DATE:     October 22, 1996
                    Christopher W. Aiken

REVIEWED BY QA:                         DATE:     October 22, 1996
                    William J. Bryan

APPROVAL:                               DATE:     October 22, 1996
                    David Conover

*_/If a product name is not included in the "first incorrect version",
the full ANSYS program is implied.  For products not listed, this error
does not apply, but see the reverse side for equivalent product
designations.

Unless noted otherwise, this error report also applies to all revisions
after the first incorrect one and prior to the corrected revision.  All
revisions after "corrected in" are corrected.  Manual corrections are
included in on-line documentation as appropriate.  Please see the reverse
side of this sheet for additional information on ANSYS revision
identifiers.

            ANSYS [Registered Trademark] CLASS3 ERROR REPORT

                                                  ERROR NO: 96-46

KEYWORDS: CFD       THERMAL EXPANSION   FLUID141       FLUID142

DESCRIPTION OF ERROR:

     For FLUID141 and FLUID142, the coefficient of thermal expansion
(input using the FLDA,TURB,BETA command) is ignored in any analysis.  The
print file (file.pfl) reports a value for this quantity, but incorrectly
lists the bulk modulus value (FLDA,BULK,BETA) for the fluid instead.

FIRST INCORRECT VERSION(S):*_/               CORRECTED IN:*_/

Rev. 5.1                                     Release 5.4
ANSYS/FLOTRAN Rev. 5.1

SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:

COMMENTS:

     This only affects turbulent analysis with significant buoyancy
effects.  Even though the results appear correct, the source term in the
k-e model due to gravitational effects is zero.

AUTHOR/CORRECTOR:                       DATE: October 22, 1996
                    Deepak Ganjoo

REVIEWED BY QA:                         DATE: October 22, 1996
                    William J. Bryan

APPROVAL:                               DATE: October 22, 1996
                    David Conover

*_/If a product name is not included in the "first incorrect version",
the full ANSYS program is implied.  For products not listed, this error
does not apply, but see the reverse side for equivalent product
designations.

Unless noted otherwise, this error report also applies to all revisions
after the first incorrect one and prior to the corrected revision.  All
revisions after "corrected in" are corrected.  Manual corrections are
included in on-line documentation as appropriate.  Please see the reverse
side of this sheet for additional information on ANSYS revision
identifiers.

                             ANSYS QA NOTICE

                                                  NOTICE NO: QA96-05 R1

SUBJECT: MATRIX50   SUPERELEMENTS       COUPLED DEGREES OF FREEDOM

DESCRIPTION:

     This QA Notice originally described a potential Class3 error for
which the full scope had not been determined.  The full scope of this
error has now been determined and is reported in Class3 Error Report
96-43 which supersedes the originally issued QA Notice QA96-05.

AUTHOR/CORRECTOR:                            DATE: October 22, 1996
                    Kenneth G. Podlaszewski

REVIEWED BY QA:                              DATE: October 22, 1996
                    William J. Bryan

APPROVAL:                                    DATE: October 22, 1996
                    David Conover

                             ANSYS QA NOTICE

                                                  NOTICE NO: QA96-09

SUBJECT:            ELEM62         ELEM97         MAGNETICS

DESCRIPTION:

     Our internal theoretical investigation of the three-dimensional
nodal-based magnetic vector potential formulation (used for SOLID62 and
SOLID97) has determined that the normal component of the magnetic vector
potential must be discontinuous across material interfaces of differing
permeability.  This behavior has not been published in any technical
journals that we are aware of.  The present formulation is implemented
assuming continuity of the vector potential in the whole domain.

     The formulation works well for axisymmetric type three-dimensional
models with azimuthal currents where the magnetic vector potential is
predominately tangent to the surface of material discontinuities.  It
also works well for completely homogenous problems (i.e., constant
permeability everywhere).  Two-dimensional problems using PLANE 13 or
PLANE 53 are not subject to any accuracy problems of this nature.

The formulation does not provide accurate solutions for general
three-dimensional problems containing materials of differing
permeability.  More specifically, accurate solutions will not be produced
in permeable domains where the normal component of the magnetic vector
potential is significant across the material interfaces.

AFFECTED VERSIONS: Revision 4.4A through Release 5.3

COMMENTS:

     For general static magnetic field analysis, use the scalar potential
formulations offered in elements SOLID5, SOLID96 and SOLID98.

AUTHOR:                                 DATE: October 22, 1996
               Dale Ostergaard

REVIEWED BY QA:                         DATE: October 22, 1996
               William J. Bryan

APPROVAL:                               DATE: October 22, 1996
               David Conover

                                                                 SCB96-01
                   ANSYS Support Coordinator Bulletin

This Support Coordinator bulletin consists of two sections.  The first
section contains information pertaining to the ANSYS 5.3 Second Release.
The second section provides information about known, non-Class3 errors in
the ANSYS program and information regarding workarounds.

ANSYS 5.3 Second Release

ANSYS 5.3 Second Release (identified by build number UP100396) is now
available.  This special version includes the new IGES capabilities for
the hardware systems that did not contain the capabilities in the initial
release of ANSYS 5.3.  These systems are the Digital Alpha Unix, Digital
Alpha Windows NT, Silicon Graphics R8000 and R10000.  This special
version also contains numerous corrective enhancements, some of which are
listed below by category.

PREPROCESSING

     o    Areas represented by high order NURBS surfaces now mesh
          properly.

     o    A problem with area meshes with large transitions producing
          inverted elements has been corrected.

     o    Meshing without smartsizing has been improved to reduce the
          resultant mesh coarseness.

SOLUTION

     o    Nonlinear transient thermal analyses using the Pre-conditioned
          Conjugate Gradient (PCG) solver no longer use more iterations
          than necessary.

     o    Pressure PSD spectrum analysis without a load vector scale
          factor specified (LVSCALE) no longer terminates with a
          confusing message.

     o    Modal analysis (ANTYPE, MODAL) of a model with separate
          constraint equations at two or more nodes of an element,
          performed with the block Lanczos method (MODOPT,LANB) or the
          subspace method (MODOPT,SUBSP) with the Frontal solver option
          (EQSLV,FRONT [default]) or the JCG solver option (EQSLV, JCG)
          now works correctly.  This error is reported in Class3 Error
          Report 96-42.

     o    Analysis of a model with separate constraint equations at two
          or more nodes of an element performed with the ICCG solver
          (EQSLV, ICCG) now works correctly.  This error is reported in
          Class3 Error Report 96-42.

     o    Analysis of a model with separate constraint equations at two
          or more nodes of an element performed with the JCG solver
          (EQSLV, JCG) in which the matrices are unsymmetric (such as in
          piezoelectrics, acoustics, and other multiphysics applications)
          now works correctly.  This error is reported in Class3 Error
          Report 96-42.

     o    Artificial stress concentrations are no longer produced in
          Solid 92 and Plane 2 elements with curved edges 1 X 10**-3 or
          less in length.  This error is reported in Class3 Error Report
          96-50

     o    Erroneous fluxes are no longer produced in Solid87 elements
          with curved edges 1 X 10**-3 or less in length.  This error is
          reported in Class3 Error Report 96-50

Page 1 of 5

MISCELLANEOUS

     When archiving a model (CDWRITE command) that has the Pre-
     conditioned Conjugate Gradient (PCG) solver activated, the resultant
     file now contains the correct command for activating the PCG solver.

     Specifying uniform contour values for displays (/CONTOUR command)
     now works properly in ANSYS/Thermal and ANSYS/Emag.

     The status report that prints out after an IGES transfer is
     completed is now the same as in Revision 5.2.

     The messages produced when there is not enough memory for the Block
     Lanczos solver now reports the correct values for memory available
     and memory required.

GRAPHICS

     A problem with the GUI operating slowly on some PCs has been
     corrected.

     A legend now appears when surface loads are displayed.

     Modal animation on the PC has been corrected to animate forward-
     reverse-forward since the media player has a forward only
     limitation.  This permits animation of the full mode cycle.

     Animation now works correctly on PCs using minimum required colors.

ANSYS DISPLAY Utility

     In the DISPLAY Utility on the Windows NT and Windows 95 versions,
     the "cancel" button in the "Open Color Map File" and "Save Graphics
     File (Color Sorted)" windows now works properly.

ANSYS/LS-DYNA

     The EDLOAD command now correctly transfers rotation nodal degree of
     freedom nodal loads (Lab=ROTX, ROTY or ROTZ).  This error is
     reported in Class3 Error Report 96-48.

     All cases of rotated nodes are properly error trapped preventing
     their use in LS-Dyna (which does not support nodal rotations).  This
     error is reported in Class3 Error Report 96-49.

     The GUI now properly handles the entering of real constants for the
     COMBI165 element.

Reported Errors and Possible Workarounds

The following list provides information about some significant errors
that have been reported and describes workarounds where possible.

KEYWORDS:           USER INTERFACE           S-N TABLE

DESCRIPTION: In the General Postprocessing Fatigue S-N Tables, the
alternate stress vs. cycles tables are set up.  When the "Apply" or "OK"
button is picked, the "entire table", and not just the user's input, is
sent to ANSYS in the form of "FP" commands.  If the entire table is not
filled, the locations are sent as blanks or zeros.  When POST1 interprets
the GUI generated "FP" commands, a "zero" value will replace the value in
"STTTM" locations 1, 7, 13, 19, etc.  if the user did not fill these
locations.  The "FP" documentation does indicate that the value of zero
will be used in the "STTTM" location if a "blank" or "zero" is input;
however, this is an unexpected behavior when the data is coming from the
GUI table setup.

AFFECTED VERSIONS:  Rev.5.1, Rev. 5.2, Release 5.3

Page 2 of 5

WORKAROUND:  Issue an FP command for each value to be deleted.  For
example use FP,-7 to erase the value in location 7 in the S-N Table.

KEYWORDS:           USER INTERFACE           MATRIX27

DESCRIPTION:   The real constant dialog for MATRIX27 displays incorrect
values for the following items when editing an existing real constant
set:
     C25, C26, C27
If you are creating a new set or editing an existing one, the values
input will be correctly sent to ANSYS.

AFFECTED VERSIONS: Rev.5.1, Rev.5.2, Release 5.3

WORKAROUND:    If you use the dialog box for editing purposes, be sure to
set C25, C26, and C27 to the correct values before choosing OK.

KEYWORDS:           FLOTRAN        POST1     RESUME

DESCRIPTION:   FLOTRAN results are not saved from POST1.  Issuing a SAVE
and RESUME or just a RESUME will cause some results to be unavailable.

AFFECTED VERSIONS: Rev.5.1, Rev. 5.2, Release 5.3

WORKAROUND: Issue a SET command in POST1 after a RESUME.

KEYWORDS:           SOLID MODELING      IGES      CDWRITE        CDREAD

DESCRIPTION: Doing a CDWRITE.ALL may produce a.cdb file that does not
contain parameter data.  When a CDREAD, ALL is done, warning messages may
result, caused by the missing parameter data.

AFFECTED VERSIONS.  Rev.  5.2

WORKAROUND: None

KEYWORDS:      SOLID MODELING           MESHING        IGES

DESCRIPTION:  The aspect ratio checking for bricks is limited in the
mesher.  CHECK, ESEL, WARN does not perform this checking.

AFFECTED VERSIONS: Rev. 5.0, Rev. 5.0A, Rev.5.1, Rev.5.2, Release 5.3

WORKAROUND:    Limit the element sizes along the edge so that they stay
within a reasonable aspect ratio using good engineering judgment.

KEYWORDS:      SOLID MODELING           MESHING        IGES

DESCRIPTION: When meshing an area containing many tesselations, a large
amount of time may elapse due to the geometry of the area.  An example of
these geometries may be a large number of holes in the area.

AFFECTED VERSIONS:  Rev.5.1, Rev. 5.2, Release 5.3

Page 3 of 5

WORKAROUND: Reduce the number of holes (<15) in the affected areas.  This
can be done by splitting the area into a number of smaller areas.
Another way to decrease the amount of time spent meshing is to turn off
color shading if running interactively.

KEYWORDS:      SOLID MODELING           VROT           ARSYM

DESCRIPTION:   Performing a VROT after an ARSYM may generate an incorrect
element and nodal pattern in the resultant volume.

AFFECTED VERSIONS:  Rev.5.1, Rev. 5.2, Release 5.3

WORKAROUND:    After the ARSYM and before the VROT command, issue
NUMMRG,KP and NUMMRG,NODE to merge any coincident keypoints or nodes.

KEYWORDS:      SOLID MODELING           VEXT           CSYS

DESCRIPTION:   In a non-Cartesian coordinate system, the VEXT command
will locate the end face of the volume based on the active coordinate
system and the extrusion will be along a straight line between the end
faces.  This is not an error, but it may not produce the result you
expect.

AFFECTED VERSIONS: Rev. 5.0, Rev. 5.0A, Rev. 5.1, Rev 5.2, Release 5.3

WORKAROUND: A user may perform an extrusion along a "curved path" by
performing a sequence of VEXT operations along a piecewise linear line
that is a good approximation of the curved line.  Its success can not be
predicted easily and depends on the model and the choice of the
approximated piecewise linear line.

KEYWORDS:      SOLID MODELING           VEXT           AREAS

DESCRIPTION: When doing a VEXT on a set of areas, if an area that is
parallel to the line of extrusion is selected, the extrusion will be done
on all the areas including the parallel area.  However, any resulting
volume calculations will be incorrect based on the fact that the parallel
area was selected.

AFFECTED VERSIONS: Rev. 5.0, Rev.5.0A, Rev.5.1, Rev. 5.2, Release 5.3

WORKAROUND: Make sure that all selected areas are not parallel to the
line defining the extrusion direction.

KEYWORDS:      SOLID MODELING           LARC

DESCRIPTION: When performing an LARC command with a large radius and a
small arc angle, a complete circle may be produced.

AFFECTED VERSIONS: Rev. 5.0, Rev. 5.0A, Rev. 5.1, Rev. 5.2, Release 5.3

WORKAROUND: Use a straight line to connect the two keypoints.

KEYWORDS:      SOLUTION       GP        LSWRITE/LSSOLVE

DESCRIPTION: Having gap conditions (GP command) in a reduced or mode
superposition analysis and using the LSWRITE and LSSOLVE commands will
produce erroneous results.  The gaps are not supported properly in the
solution.

AFFECTED VERSIONS: Rev.5.0, Rev. 5.0A, Rev. 5.1, Rev. 5.2

Page 4 of 5

WORKAROUND: Use the SOLVE methods of specifying multiple load steps.
Refer to Basic Analysis Procedures Guide, Chapter 3 (ANSYS 5.3) or the
Procedures Manual, Chapter 10 (ANSYS 5.2 or earlier).

KEYWORDS:      SOLUTION       BEAM3     PIPES     TORSIONAL

DESCRIPTION: Beams and Pipes have no extra torsional resistance in their
stress-stiffness matrix.  No torsional resistance is added by turning
stress stiffening (SSTEF) on.  This is documented, but does not work as
may be expected.

AFFECTED VERSIONS:  Rev 5.1, Rev. 5.2, Release 5.3

WORKAROUND: Use 3-D solids.

KEYWORDS:      SOLUTION       BEAM3          NLGEOM

DESCRIPTION:   BEAM3 with large deflection (NLGEOM) turned on and under a
large axial load may not converge properly.

AFFECTED VERSIONS. Rev. 5.1, Rev. 5.2, Release 5.3

WORKAROUND: Turn on stress stiffening to aid convergence.

KEYWORDS: SHELL150       CP        MID-SIDE NODES      SOLUTION

DESCRIPTION: In SHELL150 (p-elemet), coupling of midside nodes (CP
command) is limited to transnational d.o.f.s only.  Any midside node
rotation d.o.f.s only.  Any midside node rotation d.o.f. that is part of
a CP command will be ignored from the coupled set.

AFFECTED VERSIONS: Rev. 5.2, Release 5.3

WORKAROUND:    None

AUTHOR:                                      DATE: October 21, 1996
               Michael F. Michalski

AUTHOR:                                      DATE: October 21, 1996
               Kenneth G. Pedlaszewski

REVIEWED BY QA:                              DATE: October 21, 1996
               William J. Bryan

APPROVAL:                                    DATE: October 21, 1996
               David Conover

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