Technical evaluation is required before applying new preventive maintenance and repair welding. However, in a utility, the field where development of new maintenance technology is not made positively can see from the uncertainty of approval process. In view of such the present, NISA and JNES recognize to need gathering of information positively and p rior review is performed with a margin about the new maintenance technology which introduction will be expected from now on is improved to enable quick and st...
英字タイトル:
On compatibility review to the technical standard of new preventive maintenance technology

The authors developed an online method to monitor the condition of sensors implemented in Nuclear Power Plants. The method employs Sequential Probability Ratio Test (SPRT), and calculates log-likelihood function of each sensor readings obtained through the plant process computer to determine whether the value of the l og-likelihood function exceeds a statistically defined setpoint. A study on data collected during startup testing of a BWR power plant showed that the method wa s applicable for 1824 sensors...
英字タイトル:
Online Monitoring of Nuclear Power Plants Instrumentation