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Passive Safety Injection System Design and Simulation for Small Scale Pressurized Water Reactor

Thesis Info

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Author

Tahir, Muhammad

Program

PhD

Institute

Pakistan Institute of Engineering and Applied Sciences

City

Islamabad

Province

Pakistan

Country

Pakistan

Thesis Completing Year

2011

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1973

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726842414

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Safety and availability are prime factors for nuclear power plant operation. Safe operation requires a well-built backup of safety systems for saving plant capital cost, environment and the public. The backup system is maintained with the use of active and passive safety systems in the form of engineered safety features. Traditionally, active safety systems have been utilized for counteracting accidental conditions. These systems require proper and timely operator actions, which is some time misleading. Now a day, passive safety systems are becoming more popular due to their dependence on forces of nature for operation and actuation. Passive operations include, under gravity flow, natural recirculation of fluid and nitrogen gas pressure. For such type of systems, when certain conditions are met and the passive operation is started automatically. Therefore, world nuclear community has started using passive safety systems in the present nuclear power plant technology due to the simplicity in operation, maintenance and safety enhancement. This thesis concentrates on the augmentation of passive safety features in small scale pressurized water reactor design. The research was started with the study and simulation of a small scale reference power plant. The scope of simulation includes safety systems including necessary nuclear and conventional island. The individual process systems and related electrical systems are simulated and integrated within the frame work of their respective instrumentation and control to form a standalone simulated model for a reference power plant. Using this model, design basis accident has been modeled and the response of the safety systems together with related primary systems has been observed. Satisfactory results have been experienced in this regard. The research was extended by designing and simulating a passive safety injection system. This proposed system consists of many passive components and functions in place of an existing safety injection system for mitigating loss of coolant accidental condition. The use of proposed passive system has been suggested only for intermediate type pipe breaks because for small breaks, the depressurization is slow and only high pressure charging system is utilized whereas for larger breaks, the depressurization is very fast and low pressure safety injection system is actuated rapidly. Therefore, in a simulation test run this proposed system has been tested and verified for intermediate coolant loss accident. It has been found that the response of the proposed passive system is satisfactory and it keeps all necessary safety parameters within range. Through this research, it is concluded that the proposed passive system could be a potential candidate for handling intermediate type breaks representing loss of coolant accidents in small scale pressurized water reactors. For other accidental conditions of the plant like steam generator tubes rupture and steam line break, the use of conventional way of accidental management has been suggested. Keywords: Advance NPP, Passive safety, Analysis, LOCA, Reliability
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خیر النساء حضرت فاطمۃ الزھراؓ

خیرالنساء فاطمۃ الزھراؓ کے حضور!

شرم و حیا کا اوج ہیں ، پیکر رضا کی ہیں
زوجہ علی کی، بیٹی رسولِ خدا کی ہیں
معیار بے نظیر ہے اُن کے حجاب کا
عورت کا ہیں وقار تو زینت حیا کی ہیں

THE EFFECTS OF A PRAGMATIC SET OF INTERVENTIONS ON THE SHOULDER RANGE OF MOTION IN MALES AND FEMALES WITH SHOULDER PAIN: A CLINICAL TRIAL

Background and Aim: The effects of novel set of interventions are known but their effects with respect to gender are not known. This study aim to determine the effects of novel set of interventions on shoulder range of motion in males and females with shoulder pathology. Methodology: This study was of quasive experimental design. Thirty subjects of mean age (±SD) of 43. 23±10 years with shoulder pathology and restricted ROM were recruited. The major criteria for recruitment were 18-60 years of age. The general contraindications of manual therapy were the exclusion criteria. Shoulder functional movement and range of motion were the outcome measures.  Results: The mean % (SD) change for RUBB was 15.04±11.57for males and  14.49±10.44 for males. The change for RDBN was also significant (<0.00) from baseline and the % change in mean was 14.93±11.0 for males and 12.60±9.06 for females. The changes were well above the highly clinical meaningful difference (>0.8). It is further observed that the differences in gender were non-significant (P>0.05). Conclusion: The pragmatic set of interventions affect both the genders equally and improve shoulder range of motion and functional movements.  However, the results must be interpreted cautiously because of the inadequate sample size.

Leading Role of Political Dynasties of Faisalabad Division in Politics-1985-2015

Faisalabad Division is comprised of four districts namely Chiniot District, Faisalabad District, Jhang District and Toba Tek Singh District Faisalabad,whose old name is Lyallpur, is famous as Manchester of Pakistan being industrial city. The foundation of Lyallpur was laid in 1896 on the direction of the then time Lt. Governor of the Punjab, Sir James Loyal.Before 1880, it was known as Chenab colony. The map of Faisalabad was planned by Sir Ganga-Ram. River Chenab is at a distance 25-miles towards north-west and river Ravi is at about 27-miles towards East. Area in between these rivers was named Sandal Bar. Strong establishment in central government in sub-continent goes to chandar Gupt Moria, Ashoka family, However different tribes like Pehlvi, Parthvi, Satwahan etc, all are note worthy Hindu rulers. Alexandar the great, Muhammad Bin Qasim, Ghaznvi, Ghori, Mir-Taimor, Subsequent rulers and later Ahmad Shah Abdali attacked the northern side of the India and east India company entered from southern side these invaders brought change in civilization, cultural impact and political thinking. Pre-partition Punjab is attractive site due to fertility of the land. So land was devided accordingly to rain fall in this region, namely Sandal Bar, Gunji Bar, Karana Bar, Gondal Bar, Neeli Bar are famous due to agricultural products. Plateau of potohar is famous for oldest civilation of the world. Sandy and deserted area is of cholistan lies in Bahawalpur-Division and Thal in Sindh tributaries. Gordaspur, Amirsar Ferozpur, Lahore, Kasur in upper souty of Bari-tributory is called Majha, peoples of this area are famous for bravery, healthy, lilitary support culture. Old Punjab was partitioned under the act of 3rd June 1947. Which resulted, Lahore division consisting of Gujranwala, Sheikhpura and Sialkot. Second Division was Multan, havingDera Ghazi Khan, Jhang, Lyallpur, Sahiwal and Muzzaffargarh while in third division, Rawalpindi, Attock , Jhelum. Sseikhpura and Mian-wali District were added. After the breakup of west Pakistan, Punjab Province restored back by general Yahya Khan in 1070. Fertility of the land made Punjab Prominent from other provinces whereas it maintained its cultural as well as traditions. Whereas the percentage of Rajpoot, Jatt, and Arains is more than Pathans or Sindhis in Punjab. As compared to Hindu Caste system, every villager has caste that represent his personality and recognition. Present Punjab is the biggest province of Pakistan on the basis of population. Punjab has nine Divisions and Faisalabad is one to them. The main tribes and castes which are settled in Faisalabad division are Jatt, Arain, Gujjar, Rajput, Mughal, Syed, Pathan, Balochi, Bhatti, Awan and Kashmiri. Before the creation of Pakistan there was a difference between locals and settlers. Afterward, Faisalabad division was molded with the arrival of Mahajreen. The agricultural system is the main cause of its prosperity. The main power of influence lies in villages. British rulers, like Mughals, established administrative management basing the landlord’s co-operation. The term Biradary, is used on small scale level while caste is used at broader level. The basic unit of Punjab Biradarism is village. Its social structure has much low-level itself. These are, Arain, Aroray, Awan, Baloch, Pathan, Pakhi-was, peernay, Jutt, Chohray (Khakh-roob) Dogar, Doom, Rajpoot structures are due to political power and influence. The major Biradaries as accepted by British rulers, Sayyed, Sheikh, Bucher, Kamboh, Kanjar, Khoja, Gujjar, Laghari, Mizari, Makhdom, Gillani, Dohay, Noon, Watto, Moakhal, Twanay, Doltany, Ranay, Roy, Cheema, Chatha, Khosa, Sial, Mazari, Bosal, Kharal, Jiwana, Varyo, Niazi, Khawaja Sheikh, Kashmiri. Much has been written about political situation in Punjab but topic is unique and significant for further investigation of reasons of presence/support of Biradary system in politics of Faisalabad Division. Despite huge politics and social changes during last 70-years, the electoral politics in Pakistan has remained largely basing on family enterprises, Yet Biradary/caste system, is very prominent in Faisalabad Division. Biradary system is follow up old Aryas’s Social system. Hindu-Society strictly adhere where as Muslims replace this with Biradary system. In 1970, on slogan of Roti, Kapara Makkan, Biradary system was broken at provincial and national level yet local grouping remained in contact in local bodies election. However in Zia-ul-Haq regime local bodies election, on-party basis, played very crucial role in up-rooting the Biradary system. Never-theless in General election in 1988, 1990, 1996 and in 2002, the political impact of Biradary system lessened in general election in Punjab. Even then Biradary system remained empowered due to the reason of chairman’s election which were held on the baiss of Biradary system is the indicative of fact that Biradary system campaign remain incontact in National/Provincial or local bodies organizations. That is why regionalism got severe in Punjabi politics and the Baradarism engulfed the province of the Punjab with different Baradaries who got more tendancy of the tradition of Baradarism during martial law, because Political parties cound not take part in politics directly. Before independence, Arain and Jutt Biradary was prominent in local bodies election. Major political party was unionist party and afterward Muslim league achieved historical victory due to Jutt and Arain Biradary. Later on due to migrated peoples made sandal Bar prosperous (Faisalabad Div). Peasants of Faisalabad are more powerful than non-peasants due to Biradism. Up to 1970, Jutt, Rajpoot and Arain was in majority. There are 200-political parties registered with election commission of Pakistan. Some active parties are described. Ratio of different Biradarism based memberism National Assembly in Faisalabad division is as Rajputt: Sayyed: Arain: Religious: Baloch: Jutt: Ansari: Gujjar: Khan: Awan: Malik: Sial: Cheema. The average statistical data for Punjab Provincial Assembly is :: 24%: 18% :14%: 6%: 5%: 17%: 4%: 2%: 4%: 2%: 4%: 1%: 1%: 2%: 1%: 1%: for above Biradaries in Faisalabad division. The prescribed ratio has slight variation in this division of winning of seats in general election year 1988, 1990, 1993, 1997, 2002, 2008, 2013 for provincial assemblies. However, no political party formally nominated candidates for district council’s chairmanship in election 2013. So Biradaries nominatedand planned especially for the success of their councilors. No doubt, the factors of urbanization and industrialization slow down the impact of Biradarism but the process is snail paced which has negative effects on national politics. Incapable, vulgar elements, joined politics as profession and idealized traditions like good will, tolerance unanimity are diminished.To eliminate the Baridarism impact in political system. We should impart and expand education system, provision of justice and fairply be made for idealized politics, maturity of people’s political consciousness, rectitude of political parties and finally increasing the representation of low classes of the society in politics.