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On October 25, 2001 at 0900 with the react … On October 25, 2001 at 0900 with the reactor at full power, the "B" Containment Hydrogen/Oxygen (112/02) Analyzer (SAH-VG-5B) pump was discovered exhibiting excessive noise during weekly I&C minor maintenance. A black residue was observed in the cabinet due to deterioration of the coupling spider. A Work Request was initiated to investigate the cause of the pump noise. At 1225 the Control Room received a trouble alarm on the "B" H2/02 Analyzer. Inspection revealed that the sample pump discharge tubing had broken off below the fitting to the regulator (R-2), causing a breach in Primary Containment. The Shift Supervisor was notified and the system was isolated at 1244. The System Engineer determined this breach to be in excess of the maximum allowable accident leak rate (La) and reported this to the Shift Supervisor. The appropriate 10CFR50.72 notifications were made. Due to the short duration of the breach (nineteen minutes), there was no increased risk to public health and safety. The Root Cause Analysis determined the tubing break was due to the cumulative effects of strains and stresses exerted on the tubing at this connection, amplified by vibraton from a failing pump coupling. Three of four set-screws which hold the coupling together had failed.</br></br>Subsequent leak rate testing demonstrated the leak to be in excess of the Technical Specification limit of 0.6 La (La equals 0.8% of Primary Containment air wt./day) and greater than the analytical limit of 1.5 % wt./day.er than the analytical limit of 1.5 % wt./day. +
October 25, 2001 +
On October 25, 2001 at 0900 with the react … On October 25, 2001 at 0900 with the reactor at full power, the "B" Containment Hydrogen/Oxygen (112/02) Analyzer (SAH-VG-5B) pump was discovered exhibiting excessive noise during weekly I&C minor maintenance. A black residue was observed in the cabinet due to deterioration of the coupling spider. A Work Request was initiated to investigate the cause of the pump noise. At 1225 the Control Room received a trouble alarm on the "B" H2/02 Analyzer. Inspection revealed that the sample pump discharge tubing had broken off below the fitting to the regulator (R-2), causing a breach in Primary Containment. The Shift Supervisor was notified and the system was isolated at 1244. The System Engineer determined this breach to be in excess of the maximum allowable accident leak rate (La) and reported this to the Shift Supervisor. The appropriate 10CFR50.72 notifications were made. Due to the short duration of the breach (nineteen minutes), there was no increased risk to public health and safety. The Root Cause Analysis determined the tubing break was due to the cumulative effects of strains and stresses exerted on the tubing at this connection, amplified by vibraton from a failing pump coupling. Three of four set-screws which hold the coupling together had failed.</br></br>Subsequent leak rate testing demonstrated the leak to be in excess of the Technical Specification limit of 0.6 La (La equals 0.8% of Primary Containment air wt./day) and greater than the analytical limit of 1.5 % wt./day.er than the analytical limit of 1.5 % wt./day. +
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15:10:14, 27 November 2017 +
December 20, 2001 +
October 25, 2001 +
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