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 Meadowview and Lockheed District Regulator Station (Meadowview and Lockheed Station) to reconfirm Maximum Allowable Operating Pressure (MAOP). This station is in Redding, California and provides regulated gas to serve the Redding area via a high pressure distribution line. PG&E’s initial phase of this project identified all traceable, verifiable, and complete (TVC) records to validate MAOP based on design and pressure test records. At this station pressure test records of four (4) joints are not TVC. These joints are located in a High Consequence Area (HCA). They are located in a Class 3 location. PG&E utilized nondestructive examination (NDE) for reconfirming MAOP at the Meadowview and Lockheed 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 all four joints flaw detection NDE was performed in a continuous manner. An indication that required assessment was found on one joint. Burst pressure calculations determined that the predicted failure pressure was above 1.5 times the MAOP value of 600 psig (1.5 x 600 psig = 900 psig). For the other three joints there were no flaws detected that required analysis, either for burst pressure or remaining life. These three joints would survive a pressure test to 1.5 times the MAOP value of 600 psig (1.5 x 600 psig = 900 psig). PG&E proposes and is seeking CPUC’s approval to reconfirm MAOP of four joints at the Meadowview and Lockheed Station via § 192.624(c)(6).#