Annulus Gas System Response Tests for Pickering NGS A, Unit 1 Commissioning

Abstract

This paper reviews the Annulus Gas System response tests carried out during the commissioning of Pickering NGS A, Unit 1 in May/June 1987 at the request of the AECB. It shows that the dynamic responses of the system ( the station dew point monitors and moisture beetles) agree with the design predictions for adequate leak detection capability.

As a result of the tests a new dew point trending range is recommended in the short term for Pickering NGS and a new hygrometer calibration (D₂O in CO₂) in place of the present calibration (H₂O in N₂) is recommended in the long term. This will improve the accuracy of the hygrometers as the calibration environment (D₂O in CO₂) will match that of the AGS. The beetle blaster lines will be modified to avoid core by passing and tuning improvements to the dew point model programme will also be implemented.