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<br /> <br />I <br /> <br />I firm energy, plus secondary energy. The <br />,estimated monthly Hoover releases <br />dUring the operating year total 14.3 mat. <br />It is estimated that generation trom these <br />Hoover releases, along with the Hoover <br />to Parker.Davis interchange, will result in <br />delivery to the allottees of about 6.8 billion <br />kWh of electrical energy. <br /> <br />Scheduled transtormer replacements at <br />Hoover Dam began on November 4, <br />1985, proceedln9 through February 3, <br />1986, as penstocks outage permits. The <br />units aftected are N.3, N-4, AI, A2, N.l, <br />and N.2, in that order. <br /> <br />The cast iron turbine runners on A-I, A'2, <br />N-5, N.6, and N.7 will be replaced with <br />stainless steel wheels, with dates as yet <br />to be scheduled. Iron runners are subject <br />to the action of cavitation causmg pitting <br />and gradual erosion of the back side of <br />the runner blades. Stainless steel, <br />however, has the characteristic of <br />actually work.hardening in the presence <br />of cavitation. The stainless steel turbine <br />runners will therefore outperform what <br />they replace. <br /> <br />The I-year inspection of Unit G-l at Davis <br />Dam commenced in November 1985 and <br />continued through December. A l.year <br />inspection will be performed on Units <br />G-2, G-3, and G-5 and will include valve <br />replacements on all three units. <br /> <br />Outage and maintenance for Parker Dam <br />water year 1986 was scheduled for <br />September 1985 through January 31, <br /> <br />1986. Breaker and relays will be replaced <br />on Unit I, with turbine repairs yet to be <br />scheduled. The 4.year maintenance has <br />also yet to be scheduled. In November <br />1985, Unit 4 at Havasu Pumping Plant <br />was motor tested and in December, the <br />l.year maintenance was performed on <br />Unit 4. In January 1986, Unit 2 was <br />scheduled tor Ihe 2.year maintenance <br />and Unit 3 for the I.year maintenance. <br /> <br />A $7,637,385 Reclamation contract has <br />been awarded for uprating generators N-3 <br />and N-4 at Hoover Dam in Nevada. The <br />contract was awarded 10 General Electric <br />company of Denver, Colorado. Work will <br />begin in 1987 and is scheduled to be <br />completed by February 1988. <br /> <br />Principal work under the contract <br />includes conducting a study of the <br />existing generator design, furnishing and <br />installing necessary new components, <br />and modifYing the two generators, as <br />reqUired 10 accomplish the proposed <br />upratlng. The objective is to uprate the <br />generators by the optimum amount, <br />based on water availability and economic <br />teasibllity. Studies show that suHiclent <br />water, head, and turbine capacity are <br />available to produce significantly more <br />generator output than Ihe existing genera. <br />tor ratings will allow. The generators were <br />manufactured by Westinghouse. Genera- <br />tor N.3 was installed in 1937 and <br />general or N-4 in 1936. <br /> <br /> <br />Replacement Turbine Runners. Hoover Dam <br /> <br />31 <br />