Nominal full power

SVBR-75/100 (Russian Federation) 265 80 lead-bismuth none 

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Nominal thermal and flow parameters were used in the fuel performance analysis except that the thermal power was increased to 102 percent of nominal full power per NRG Regulatory Guide 1.49 to account for uncertainties in core power measurements. The major thermal parameters used in the analysis are listed in Table 4.1-1. Nominal values of material properties were used in the analysis. The design correlations for the material properties of the H-451 graphite and the fuel rods account for thermal expansion, and the effects of fluence and temperature on thermal conductivity and irradiation-induced shrinkage. These thermal and flow parameters and... 

The random deviations lead to a statistical distribution for the estimated dryout margin. Knowing the power and flow distributions for the core, the probability of dryout for individual channels may be calculated and combined statistically to obtain the dryout probability for the reactor as a whole. Once the probability of dryout has been established as a function of reactor power, it is, in principle, possible to proceed to a discussion of the effect of steady deviations in parameters and of appropriate transients. Table 3 shows an example of probabilities of dryout at overpower estimated with a typical Winfrith SGHWR core distribution of channel powers. In assessing dryout probabilities, the values for individual channels have been combined statistically to obtain a probability of dryout appropriate to the reactor as a whole. From this table, it is clear that the reactor is highly protected against dryout at nominal full power conditions. 

One could also envisage operating the reactor in nominal full-power conditions keeping the steam blower running and thus having a positive inlet steam quality. 

Subtract the stray loss to give the motor output for nominal full load. The amount of stray loss is normally taken as 0.5% of the nominal power output of the machine. The stray losses at other values of loads are obtained from ... 

The nominal fuel failure and fission product release rates are estimated using the segment average values of the as-manufactured fuel attributes given in Tables 4.2-4 and 4.2-16, nominal core operating conditions (with the exception of thermal power which is taken as 102 percent of full power), nominal fuel failure models, and nominal estimates of the fission product transport properties. 

Principal System Pressures, Temperatures, and Flow Rates (Nominal Steady-State, Full Power Operating Conditions) Location Numbers as Identified on Figure 2.24... 

B turbine reached full power (620 MWe) on 30th June, and this first build-up to S0% of nominal power was completed in July/August by calibration tests on the clad rupture detection and localization systems. 

When A turbine was available again, it was linked up to the grid on 22nd August 1986, then nominal power build-up was achieved on both turbines on 12th September, full power bdng reached on 9th December 1986. 

The reactor state, for which all reactivity coefficients were determined, was assnmed to be full-power operation with nominal parameters of the coolant (temperature and flow rate at the core inlet) and gas lift flow. 

Outlet Volumetric Flow The nominal volumetric flow of 0.15 m /sec (corresponding to a mass flow of 3.08 kg/sec) for the four loop non-optimized Brayton system of Section 6 is assumed. The range 0.01-1 m /sec has been selected to cover a sufficiently wide range of operation to provide for plant startup at reduced flows, full power operation, and casualty performance. The accuracy of 0.0025 m /sec typifies the accuracy of 0.25% of point found in gas industry ultrasonic flow metering equipment The time constant of 1 second typifies high precision pressure sensor with digital instrumentation. 

Current The 3 phase alternating current output of each Brayton madiine alternator is to be measured for monitoring and control of the alternator, the machine, and the power plant. A nominal phase current of 128 A at 2250 Hz is assumed at full power operation. To accommodate startup and steady state operations, the sensor would have a wide range capability of 0 -1 A with an accuracy of 0.15 A, a resolution of 0.03 A, and a time constant of 1 second including sensor and instrumentation. These criteria reoresent tvpical capabilities of commercial sinusoidal oirrent meters. 

Inlet Temperature The nominal heat rejection system inlet tonperature of 505 K is based on the four loop non-optimized Brayton system of Section 6. The range 250-570 K assumes the plant maintains temperature not below 250 K, a 10 K control band for reactor operation at full power, the stated accuracy of 1% and a 10% uncertainty for transient performance due to casualty or maneuvering. The number is rounded. The accuracy of 3 K (1 % of range) and the resolution of 1.5 K (0.5% of range) and the 10 second response typify the diaracleristics of quality commercial temperature sensors and instrumentation. 

Panel widths ranged from 8 to 10 feet, lengths were 8 to 12 feet, and nominal thickness was 4 inches. The desirable approach is to deliver a full width of mixed material at the beginning to the panel and sustain a delivery rate to maintain full width ahead of the screed. Screeds used were wood equipped with a vibrator, either electrical or air-powered, the latter being preferred by these operators. Once the screed starts, it is preferable to continue in one single sweep to the completion of the panel. Figure 6 shows a floor section after screeding. 

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