PACIFIC GAS & ELECTRIC CO — Integrity Assurance Notification

MAOP RECONFIRMATION METHOD 6Pacific Gas and Electric Company (PG&E) has performed MAOP reconfirmation via § 192.624(c)(6) Alternative Technology of the joints at its Gridley Junction Station to reconfirm Maximum Allowable Operating Pressure (MAOP). This station is in Gridley, California and provides regulated gas to the Gridley area and portions of the North Valley Division. PG&E’s initial phase of this project identified all traceable, verifiable, and complete records to validate MAOP based on design and pressure test records. At this station pressure test records of thirteen (13) joints are not traceable, verifiable, and complete. These joints are not located in a High Consequence Area (HCA) or Moderate Consequence Area (MCA). They are located in a Class 2 and a Class 3 location. PG&E proposes to reconfirm MAOP via § 192.624(c)(6) Method 6: Alternative Technology. PG&E utilized NDE methodologies for reconfirming MAOP at the Gridley Junction Station, satisfying the requirements of § 192.624(c)(6). Flaw detection NDE was performed on these joints to detect external (outer diameter), internal (inner diameter), and mid-wall indications. For the 13 joints flaw detection NDE was performed in a continuous manner. There were no flaws detected that required ECA analysis, either for burst pressure or remaining life. These joints would survive a pressure test to 1.5 times the MAOP values of 800 psig (1.5 x 800 psig = 1,200 psig) and 250 psig (1.5 x 250 psig = 375 psig). PG&E proposes and is seeking CPUC’s approval to reconfirm MAOP of 13 joint(s) at the Gridley Junction Station via § 192.624(c)(6).#