FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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ELECTRICAL POWER DISTRIBUTION SYSTEM IMPROVEMENTS, PROJECT NO. J-98
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a Professional Design Services Agreement with Brown and Caldwell to provide engineering services for the Electrical Power Distribution System Improvements, Project No. J-98, for an amount not to exceed $2,240,000; and
B. Approve a contingency of $224,000 (10%).
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BACKGROUND
The electrical distribution systems at Plant Nos. 1 and 2 are critical to ensure power supply to all plant facilities at all times. The electrical distribution system includes distribution centers, power buildings, and electrical rooms throughout the plants. These facilities use switchgears and automatic transfer switches to distribute utility, Central Generation, and standby generator power.
RELEVANT STANDARDS
* Comply with Government Code Section 4526: Select the "best qualified firm" and "negotiate fair and equitable fee"
* 24/7/365 treatment plant reliability
PROBLEM
The distribution systems at Plant Nos. 1 and 2 have a number of deficiencies and in some cases pose increased arc flash potential. These deficiencies include aged and obsolete equipment that are in need of replacement.
Plant No. 1 does not have an automated load shedding scheme in place. In the event of a system disturbance, such as a Southern California Edison (SCE) outage, electrical maintenance staff at Plant No. 1 are required to reconfigure the electrical system throughout the plants. If non-critical loads are not shed in time, Central Generation is unable to maintain the load and shuts down. After a shutdown, staff must manually initiate restarting of equipment in a particular sequence to avoid overloading of standby generators. This is a time consuming and inefficient means of operating...
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