Bad week on Plymouth’s Rocky Hill Road
PLYMOUTH — Pilgrim station experienced its third notable ‘event’ in the last ten days and, eighth in 2013, when on Sunday, April 14, at 10:16 p.m. “the PNPS Containment Personnel Air Lock failed integrated air lock testing.”
NRC regulations require that primary reactor containment meets certain leakage rate testing requirements to ensure that “leakage through the containment or systems and components penetrating the containment do not exceed allowable leakage rates specified in Technical Specifications and the integrity of the containment structure is maintained during its service life.”
On April 10th staff discovered indications of a separation in the “Neutralizing Sump Discharge Line.” On April 15 a manual scram took place during a planned shut down when reactor pressure went “beyond established control bands.” And now, plant officials have reported that, during that shut down primary air lock failed a leak rate test as well. Look to the weekend edition of the Old Colony Memorial for the full story.