English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Since 1990s, an uprate of the thermal output has been carried out in USA using a method of measurement uncertainty recapture called as MUR. The principle of the MUR method is based on reduction of the measurement uncertainty of the feedwater flow rate using an ultrasonic flowmeter with high accuracy. Since the measurement uncertainty of thermal output can be reduced using that flowmeter, the thermal output can be increased within the reducing value of the uncertainty. The ultrasonic flowmeter using in a feedwater loop should be calibrated under the same condition of a nuclear power plant because of the correction factor of it is strongly affected by the condition of the flow field such as Reynolds number. To realize an actual flow calibration of feedwater flowmeter used at nuclear power stations at Reynolds numbers of up to 18 million, a new test facility is constructed at National Metrology Institute of Japan (NMIJ). This very large Reynolds number is achieved at a flow rate of 12000m3/h and water temperature of 70°C in a 600 mm pipe. Then the pipe prover system for 750 m3/h is also constructed to confirm of the temperature effect on the flowmeters. This paper describes overview and characteristic of the new facility.

High Reynolds Number Facility for Calibration of Feedwater Flowmeter in Nuclear Power Plant (Overview and Characteristic of Facility)