Graduate Thesis Or Dissertation
 

Calculation of consistent steady-state conditions for boiling water reactors based on RETRAN models

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/w3763959q

Descriptions

Attribute NameValues
Creator
Abstract
  • A study regarding steady-state conditions in boiling water reactors was conducted in order to provide consistent initial conditions for transient analysis using the computer simulation code, RETRAN. Consistent steady states were generated with the RETRAN model of the system by first establishing a reference state, and then obtaining other steady states as asymptotic equilibria which the system approaches some time after introducing certain perturbations. A simplified version of the RETRAN model was then used as the basis for the development of an approximate explicit solution, based on steady-state mass and momentum conservation, to predict the asymptotic flow rates in the reactor vessel as a function of the recirculation pump speed. The results from these calculations were compared to the equilibrium conditions determined by the RETRAN calculations, sources of error were examined, and conclusions were drawn. The analysis demonstrated that the method used to predict the flows and pump speed at various steady-state conditions provides good agreement with the RETRAN results. An error analysis indicated that errors due to the approximations generally increased as the strength of the perturbation increased (i.e., increased deviation from the reference state). However, the magnitude of the errors is such that, within limitations, the simple model provides good approximations of the flows and pump speed which are consistent with the RETRAN model. The advantage of the explicit solution obtained by the simplified model lies in the fact that it permits direct and easy determination of steady-state system flow rates when pump speed and reactor power are given. When these flow rates are used as input to RETRAN, they will result in the determination of junction form loss coefficients for closed flow loops which will closely match those of the reference state, hence the condition for consistency is satisfied.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details YoshiharaGrantMasaru1980.pdf 2017-08-10 Public Download