Diagnostics of core barrel vibrations by in-core and ex-core neutron noise
2003 (English)In: Progress in nuclear energy (New series), ISSN 0149-1970, Vol. 43, no 04-jan, 151-158 p.Article in journal (Refereed) Published
Diagnostics of core-barrel vibrations has-traditionally been made by use of ex-vessel neutron detector signals. We suggest that in Addition to the ex-core noise, also the in-core noise, induced by core barrel vibrations, be also used. This would enhance the possibilities of diagnostics where the number of the ex-core detectors is not sufficient or their positions are disadvantageous for effective diagnostics, especially for shell-mode vibrations. To this order, the theory of in-core noise induced by a fluctuating core boundary has been elaborated and applied to the diagnostics of beam and shell mode vibrations. The formulas were tested on some measurements taken in the Ringhals PWRs. The results confirm the validity of the model itself, and the possibilities for enhanced diagnostics were demonstrated. A more effective use of these novel possibilities requires more in-core detectors and/or better detector positioning.
Place, publisher, year, edition, pages
2003. Vol. 43, no 04-jan, 151-158 p.
core-barrel vibrations, pressurized water reactors (PWR), ex-core noise, in-core noise, beam mode vibration, shell mode vibration, boundaries
IdentifiersURN: urn:nbn:se:kth:diva-22457ISI: 000182557000019OAI: oai:DiVA.org:kth-22457DiVA: diva2:341155
QC 201005252010-08-102010-08-10Bibliographically approved