The inspectors identified an
URI during observation and subsequent review of the 0054-B,
Main Steam Line Low Pressure Group 1 Isolation Instrument Test and Calibration. The surveillance procedure instructed technicians to first close the instrument line supply valve and then to vent the instrument line between this valve and the
main steam line low pressure Group 1 pressure instrument (nominally at approximately 950 psig). This, in turn, exercised the instrument (
Bourdon tube type pressure instrument) and actuated the isolation switch. The procedure then instructed the technicians to raise the pressure, using an external pressure source to reset the switch, and then slowly lower pressure to record as-found switch trip data. The inspectors questioned whether exercising the pressure switch prior to obtaining as-found trip setpoint data constituted preconditioning of the TS-required pressure instruments and switches. The inspectors also questioned the extent of condition with respect to the procedural practice for other safety-related pressure instruments/switches. Pending final resolution with the licensee, including review by
