Power operation

Values are for normal power operation. Conductivity, pH, and concentrations of lithium and boron are plant specific and vary over the fuel cycle according to the control scheme used. See Fig. 3. 

Values given correspond to normal power operation. 

Laboratory experiments have shown that IGSCC can be mitigated if the electrochemical potential (ECP) could be decreased to —0.230 V on the standard hydrogen electrode (SHE) scale in water with a conductivity of 0.3 ]lS/cm (22). This has also been demonstrated in operating plants. Equipment has been developed to monitor ECP in the recirculation line and in strategic places such as the core top and core bottom, in the reactor vessel during power operation. 

Water chemistry is important to the safe and reflable operation of a nuclear power plant. Improper conditions can lead to equipment and material failures which ia turn can lead to lengthy unscheduled shutdown periods for maintenance (qv) and repair operations. Water chemistry can also have an impact on the radiation levels duriag both power operations and shutdown periods. These affect the abiUty of personnel to perform plant functions. 

Code of Federal Regulations, Tide 40, Protection of Environment, Part 190, Environmental Radiation Protection Standards for Nuclear Power Operations, Washington, D.C., 1976. 

Peformance Objectives and Criteriafor Operating and Near-Term Operating Ricense Plants, INPO 90-015, Institute of Nuclear Power Operations, Adanta, Ga., Aug. 1990. 

Nuclear Plant Reliability Data System Annual Reports of Cumulative System and Component Reliability for Period from July 1, 1974, through December 31, 1982, NPRD A02/A03 (INPO 83-034), Institute of Nuclear Power Operations, Atlanta, GA, October 1983. 

Accumulators can be used to help stabilize the lube system against pressure transients such as that from the turbine power operator during a large correction. For a sizing rule of thumb, the system pressure should not vary by more than 10%, while the turbine servo travels full stroke in a one second interval. The role of accumulators for pump switching was covered earlier in the section on Startup Control. 

In some cases, power-operated block valves may be substituted for the classic check valve. However, these valves depend on an outside motive... 

The Arbeitsgemeinschaft Versuchsreaktor (AVR) and Thorium High-Temperature Reactor (THTR-300) were both helium-cooled reactors of the pebble-bed design [29,42,43]. The major design parameters of the AVR and THTR are shown in Table 10. Construction started on the AVR in 1961 and full power operation at 15MW(e) commenced in May 1967. The core of the AVR consisted of approximately 100,000 spherical pebble type fuel elements (see Section 5). The pebble bed was surrounded by a cylindrical graphite reflector and structural carbon... 

Constmction of the THTR-300 began in 1972. Completion of constmction was originally expected in 1977, but first criticality was not achieved until September 13,1983 [29]. Nuclear trials continued until May 31,1987, and power operation started with handover of the plant on June 1, 1987 [43]. The reactor was shut down... 

Ziermann, E., Review of 21 years of power operation at the AVR nuclear power station in Julich, Nucl. Engr. Des., 1990, 121, 135 142. 

Analyzes shutdown and full-power operations for internal and external events ... 

The 1,356 MWe Advanced Boiling Water Reactor was jointly developed by General Electric, Hitachi, and Toshiba and BWR suppliers based on world experience with the previous BWRs. Tokyo Electric Power operates two ABWRs as units 6 and 7 of the Kashiwazaki-Kariwa Nuclear Power Station. Features of the ABWR are (Wilkins, 19921 ... 

Also, presented are the level-1 uncertainty analysis, results. The MLO mean core damage frequency from internal events is about an order of magnitude lower than that of full power operation. The mean core damage frequency due... 

The CE plants use U-tube steam generators with mixed capability to establish feed-and-bleed cooling. . Several CE plants are designed without pressurizer power-operated valves. The RCPs are a By WesI ise... 

PORV - Pilot (or power) Operated Relief Valve. 

Henry Campbell Locomotive of the 4-4-0 "American" 1886 Frank J. Sprague Electric-powered operations from... 

Figure 15.8 Double sliding cold store doors, power operated (Courtesy of Clark Door Ltd)...

Fig. 2.2.12 Gradient driver using a power operational amplifier.

Montanus, Jacob. "Of the power, operation, and exceedingly beneficial use of the glorius antidote termed potable gold." In A golden and blessed casket of Nature s marvels, ed. Benedictus Figulus, 343-357., 1893. 

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