ML19322B960
| ML19322B960 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 05/19/1967 |
| From: | Ferguson R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7912191044 | |
| Download: ML19322B960 (1) | |
Text
{{#Wiki_filter:_ _ _ _ _ gY 19 N Files a>M" TIDIU: Edson G. Case, Director [h8 R. L. Ferguson, 'ad ascring & C--~~tn 3 ranch, RS OCollEE EUr'TRAR STATIS UEITS 1, 2 and 3 ELECTRICAL SYSTEMS - DOCKET 306 50-269, 270 and 287 Aliitional information was requested fran Mr. C. Wylie (Duke Power Co.) via telecon, May 12, 1967 This esmo documents pr=14=i= 7 ansvers Mr. Wylie presented via telecon, May 16, 1967 1. All power plants installed since 1952 have been designed to reject full load while maint=4ning the plant anvilin g loads. All units (approximately 22) have been tested prior to being placed in com-mercial operation. There have been no failures since 1952. On a recent test of a 350 av unit of the Marshall Plant, the generator oversped to 3900 r;m during the test - the overspeed trip is set at 3960 rpm. There have been ne actual abnormal conditions on the Duke system which required this plant feature to be used. 2. Duke's experience in starting one of the hydro stations under super-visory control has been 8 failures in 1000 start attempts. The particular unit reported has a more complex ccumsunication system than Keovee. It consists of a 3-mile leased telephone line from the Lakewood Substation to the Power Control Building and a 25-mile microwave link to the hydro station. Mr. Wylie is attempting to get a better breakdown of the cause of failure to determine the i effect of the ccummunication system and the time distribution of failures. 3 The gas turbines at Ime are new installations, therefore, no infor: nation is available. Mr. Wylie is attempting to get suit-able information from the manufacturer. 4. Duke's outage experience with overhead transmission lines has been better than 1/100 mi/ year and outage experience for all un6erground cables,i=1udingdistributioncablestohomes,hasbeen1/70mi/ year. This undergrouni cable outage rate is not applicable to the 13 8 kr cable from Keovee since it has superior inn 1= tion, is armored, ami is installed in a controlled access area. A 1955 IEEE Report states anoutagerateof.6.7/100mi/yearforundergroundsecondarynetwork cable. cc: Edson G. Case, Dir., RS
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