Operation Feasibility Study of Adding Fourth Main Feedwater Pump to CAP1000

2017 ◽  
Author(s):  
Ke Xiao
Keyword(s):  
Feasibility Study ◽  
Load Balance ◽  
Economic Benefit ◽  
Transient Analysis ◽  
Design Modification ◽  
Feedwater Pump ◽  
Partial Load ◽  
Standard Design ◽  
Transient Loss

The standard design of CAP1000 Feedwater system configures 3×33.3% main feedwater pumps. In the operational transient “loss of one main feedwater pump”, the plant will ramp down the turbine load to 70% automatically and remain load balance by the two operational pumps. The owners of CAP1000 submitted a claim for the fourth main feedwater pump so that the plant can maintain 100% turbine load throughout the transient “loss of one main feedwater pump”. The owners insisted that this design modification avoids partial-load operation and enhance the economic benefit. In this paper, the trip risk of the addition of the fourth main feedwater pump is evaluated base on the transient analysis of “loss of one main feedwater pump”. And the solution of the fourth pump actuation plan which farthest decrease the reactor trip probability is presented. It is the most balanced plan between economy and feasibility.

The Feasibility Study on Cogeneration Using Chemical Waste Gas

2012 ◽  
Vol 518-523 ◽  
pp. 3535-3539
Author(s):  
Dong Yang ◽  
Xue Ting Liu ◽  
Cong Ju Zhang ◽  
Xiao Xiao Zhang
Keyword(s):  
Feasibility Study ◽  
Economic Benefit ◽  
Calorific Value ◽  
Chemical Production ◽  
Technical Process ◽  
Chemical Waste ◽  
Waste Gas ◽  
Main Equipment ◽  
Heat Generate

It is analyzed in the paper that the production and composition of waste gas, such blowing gas, associated in the chemical production of the chemical enterprise in Shandong. The calorific value of the waste gas is calculated. Thermoelectricity cogeneration is realizable with using the waste gas as fuel. The scale remaining heat generate electricity is determined. The types of main equipment are discussed. The technical process of cogeneration using chemical waste gas is analyzed. economic benefit is studied in detail.

scholarly journals Modification and Optimization of Groundnut (Arachis hypogaea) Roasting Machine

2020 ◽  
pp. 71-83
Author(s):  
A. Musa ◽  
O. A. Adetola ◽  
O. J. Olukunle ◽  
A. M. Akintade
Keyword(s):  
Moisture Content ◽  
Feed Rate ◽  
Mechanical Damage ◽  
Design Parameters ◽  
Design Modification ◽  
Roasting Machine ◽  
Standard Design ◽  
Roasting Temperature ◽  
Machine Speed ◽  
Optimal Machine

Roasting of groundnut is essential to ensure quality improvement, easy handling, safe storage, further processing, and value addition of the product. Therefore, the aim of the study was modified and optimized a groundnut roasting machine. Standard design parameters were used for the design modification. The design of the experiment had 27 runs. Machine speed (6.60, 12.80 and 19 rpm), roasting temperature (120, 160 and 200℃), and feed rate (120, 180 and 240 kg/h) were used as independent parameters, and the response variables include the moisture content of the groundnut, roasting efficiency, mechanical damage, throughput and quality efficiency of the machine. Response Surface Methodology (RSM) of the Design Expert Version 11 was adopted for the optimization process by applying the central composite design method for the Analysis of Variance (ANOVA) and optimized responses within the limit of the independent factors tested. Roasting temperature (200℃), machine speed (19 rpm) and feed rate (240 kg/h) were found as the optimum operational conditions which will optimally result in the optimal machine performance of 8.76% moisture content (r2 = 0.94), 76.99% roasting efficiency (r2 = 0.90), 2.46% mechanical damage (r2 = 0.86), 62.32 kg/h machine throughput (r2 = 0.98), 74.3% quality performance efficiency (r2 = 0.86) with the high desirability of 88%. An increase in machine speed increased the moisture content of the groundnut, roasting efficiency, mechanical damage, throughput, and quality efficiency of the machine. The study showed the optimal machine parameters for a groundnut roasting machine.

scholarly journals A Patient Specific Biomechanical Analysis of Custom Root Analogue Implant Designs on Alveolar Bone Stress: A Finite Element Study

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
David Anssari Moin ◽  
Bassam Hassan ◽  
Daniel Wismeijer
Keyword(s):  
Stress Distribution ◽  
Patient Specific ◽  
Surface Model ◽  
Vertical Force ◽  
Design Modification ◽  
Specific Patient ◽  
Press Fit ◽  
Bone Stress ◽  
Standard Design ◽  
The Impact

Objectives.The aim of this study was to analyse by means of FEA the influence of 5 custom RAI designs on stress distribution of peri-implant bone and to evaluate the impact on microdisplacement for a specific patient case.Materials and Methods. A 3D surface model of a RAI for the upper right canine was constructed from the cone beam computed tomography data of one patient. Subsequently, five (targeted) press-fit design modification FE models with five congruent bone models were designed: “Standard,” “Prism,” “Fins,” “Plug,” and “Bulbs,” respectively. Preprocessor software was applied to mesh the models. Two loads were applied: an oblique force (300 N) and a vertical force (150 N). Analysis was performed to evaluate stress distributions and deformed contact separation at the peri-implant region.Results. The lowest von Mises stress levels were numerically observed for the Plug design. The lowest levels of contact separation were measured in the Fins model followed by the Bulbs design.Conclusions. Within the limitations of the applied methodology, adding targeted press-fit geometry to the RAI standard design will have a positive effect on stress distribution, lower concentration of bone stress, and will provide a better primary stability for this patient specific case.

scholarly journals An ADePT evaluation for incorporating the TIPPS periodontal health intervention into primary care ante-natal programmes to enhance infant birthweight in Palestine: a feasibility study.

2021 ◽  
Author(s):  
Lamis Abuhaloob ◽  
Nahla Helles ◽  
Peter Mossey ◽  
Ruth Freeman
Keyword(s):  
Pregnant Women ◽  
Feasibility Study ◽  
Trial Design ◽  
Health Intervention ◽  
Size Estimation ◽  
Decision Tool ◽  
Periodontal Health ◽  
Design Modification ◽  
Clinic Staff ◽  
Full Trial

Abstract Background: A feasibility study was conducted to implement the T alk, I nstruct, P ractice, P lan and S upport (TIPPS) intervention for pregnant women to enhance infant birthweight in a conflict area in L ow and M iddle I ncome C ountries ( LMIC). The decision tool, A process for De cision-making after P ilot and feasibility T rials (ADePT) examines the methodological factors identified in a feasibility study, that may require modification for a full trial. Objectives: To use the ADePT decision tool to evaluate if the feasibility study had achieved its objectives and to identify the need for intervention, clinical context and trial design modification. Basic research design: Feasibility study: a one-arm, pre-test-post-test design. The ADePT framework was applied to evaluate the findings from the feasibility study. Clinical setting: Primary healthcare clinic located in Gaza City, Palestine. Participants: 25 pregnant women in their first trimester and clinic staff. Interventions: The TIPPS periodontal health intervention delivered by ante-natal nurses. Main outcome measures: ADePT checklist: sample size estimation, recruitment, consent, intervention adherence, intervention acceptability, costs and duration, completion and appropriateness of outcome assessments, retention, logistics and synergy between protocol components. Results: 25 pregnant women (aged 16-35 years old) attended the baseline and 22 (88%) completed the second follow-up appointment. This intervention significantly reduced (P<0.001) the mean percentage of plaque and bleeding scores from the baseline to Time 2. The participants stated the value of the intervention. The clinic staff voiced concerns regarding time and the cost of nurses providing the TIPPS intervention. This allowed suggestions to be made regarding the modification of trial design and context of implementation. Conclusions: The ADePT evaluation showed it was possible to progress to full trial with modifications in the trial design.

scholarly journals An ADePT Evaluation for Incorporating the TIPPS Periodontal Health Intervention Into Primary Care Ante-Natal Programmes to Enhance Infant Birthweight in Palestine: A Feasibility Study

2020 ◽  
Author(s):  
Lamis Abuhaloob ◽  
Nahla Helles ◽  
Peter Mossey ◽  
Ruth Freeman
Keyword(s):  
Pregnant Women ◽  
Feasibility Study ◽  
Trial Design ◽  
Health Intervention ◽  
Size Estimation ◽  
Decision Tool ◽  
Periodontal Health ◽  
Design Modification ◽  
Clinic Staff ◽  
Full Trial

Abstract Background: A feasibility study was conducted to implement the TIPPS intervention for pregnant women to enhance infant birthweight in a conflict area in a LMIC. The decision tool, ADePT examines the methodological factors, identified in a feasibility study, that may require modification for a full trial. Objectives: To use the ADePT decision tool to evaluate if the feasibility study had achieved its objectives and to identify the need for intervention, clinical context and trial design modification.Basic research design: Feasibility study: a one-arm, pre-test-post-test design. The ADePT framework was applied to evaluate the findings from the feasibility study.Clinical setting: Primary healthcare clinic located in Gaza City, Palestine. Participants: 25 pregnant women in their first trimester and clinic staff.Interventions: The TIPPS periodontal health intervention delivered by ante-natal nurses.Main outcome measures: ADePT checklist: sample size estimation, recruitment, consent, intervention adherence, intervention acceptability, costs and duration, completion and appropriateness of outcome assessments, retention, logistics and synergy between protocol components.Results: 25 pregnant women attended the baseline and 22 completed the second follow-up appointment. Data acquisition of the primary and secondary outcomes was mainly successful, the adherence and acceptability of the intervention was noted. The participants stated the value of the intervention. The clinic staff voiced concerns regarding time and costs of nurses providing the TIPPS intervention. This allowed suggestions to be made regarding modification of trial design and context of implementation. Conclusions: The ADePT evaluation showed it was possible to progress to full trial with modifications in trial design.

Effect of stem flattening on rotational stability of a canine femoral total hip component in polymethylmethacrylate cement

2003 ◽  
Vol 16 (04) ◽  
pp. 238-242 ◽  
Author(s):  
K. S. Schulz ◽  
P. H. Kass ◽  
S. M. Stover ◽  
D. R. Mason
Keyword(s):  
Hip Replacement ◽  
Angular Displacement ◽  
Rotational Stability ◽  
Design Modification ◽  
Mean Values ◽  
Total Hip ◽  
Testing Protocol ◽  
Component Design ◽  
Standard Design ◽  
The Mean

SummaryThis study was designed to determine the effect of flattening the lateral aspect of a commercially available femoral prosthesis on its rotational stability in polymethylmethacrylate cement. Five standard design and five laterally flattened size 7 canine femoral components were evaluated. The stems were embedded in commercially available medical grade polymethylmethacrylate and rotated 15° while torque and angular displacement data were collected. The stiffness, yield and failure variables were compared between commercial and flattened stems. None of the mechanical testing variables were statistically different between commercial and flattened stems although all of the mean values for flattened stems were higher (1-30%) than mean values for commercial stems. Rotational stability of a canine total hip replacement femoral component was not significantly enhanced by the flattened component design modification evaluated by the testing protocol in this study.

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