NAS's capabilities and experience cover the complete spectrum of software
development services. In addition, the NAS Quality Assurance Program has
been applied for the development and maintenance of safety-related software
and for software analysis applications.
The NAS staff has authored, contributed to the development of, and modified
programs used for thermal-hydraulic and physics analysis of nuclear plants.
These programs include RETRAN, RELAP5, CHECWORKS, CORETRAN, TRAC, SIMULATE-E,
CONTEMPT, PDQ7, SHUFFLE, KENO, ANISN, SIMTRAN, QUAD-P5A, DOT, SCALE, TOODEE2,
NAS offers services in four general areas
- general mathematical model development for simulating physical processes,
- software design,
- software modifications and program conversions,
- software validation and verification.
Software Model Development
NAS specializes in developing and implementing mathematical models and software
to simulate physical processes such as fluid flow, heat transfer, reactor physics.
NAS can develop models to simulate a single phenomenon or complex systems
consisting of several interacting components and processes. These models can
be developed as standalone computer programs or they can be integrated into
existing software. As contributing authors of several engineering programs,
we have the proven capability to design and implement solutions to the special
modeling needs of our clients.
Successful software development projects begin with the software specification
and design phase by detailing the functionality, data requirements, interactions, and
performance requirements. These initial steps are followed by implementation,
integration, and testing. We can help ensure the success of large or small
software development projects by
- developing software specifications,
- designing software,
- implementing software,
- performing reviews of software design and code,
- writing test procedures, and
- integrating software.
NAS is experienced in the use of the FORTRAN, C, and C++ programming
languages. During the useful life of engineering software, the source
code may require conversion to different computers or operating systems,
modifications to analyze new applications, or features. NAS has
significant experience maintaining and modifying engineering software including
- program conversion to other computers and operating systems,
- user convenience modifications,
- automated interface between codes
- model enhancements, and
- graphically oriented pre and post processors.
Software Verification and Validation
NAS staff members have served on review committees responsible for the
independent verification and validation of several engineering analysis
programs used for safety-related work. These include RETRAN-02, VIPRE-01,
COBRA-SFS, HYDRA-II, FLOWTRAN, and GOTHIC. Specific areas where NAS can
provide assistance include
- developing verification and validation plans,
- reviewing verification and validation plans, and
- performing verification and validation tasks.