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افتراضي ماهو المفاعل النووي ؟

ماهو المفاعل النووي ؟


نقدم لكم معلومات عن المفاعل النووي .

المفاعل النووي هو عبارة عن جهاز يستخدم لبدء تفاعل نووي متسلسل مُسْتَدَام و للتحكم فيه، أو بتعبير أدق للتحكم في معدل سير التفاعل النووي بحيث يمكن السيطرة عليه والاستفادة من طاقته لفترة طويلة. فشل نظام التحكم في معدل سريان التفاعل النووي المتسلسل يؤدي إلى انصهار المفاعل؛ هذا لأن المفاعل يطلق طاقته كلها دفعة واحدة في زمن قصير. يعمل المفاعل النووي بوقود اليورانيوم أو البلوتونيوم-239 حيث تعمل نيوترونات على انشطار أنوية اليورانيوم أو البلوتونيوم فتتولد طاقة حرارية.لا بد من التحكم في عمليات الانشطار النووي المتسلسلة داخل قلب المفاعل مع الحفاظ على الأجواء المناسبة لاستمرار تلك العمليات بشكل دائم دون وقوع انفجارات، تنساب الطاقة النووية من المفاعل بشكل تدريجي في هيئة حرارة وإشعاعات. والمفاعل النووي، المعروف سابقا باسم كومة ذرية، كان كومة من اليورانيوم والجرافيت، وكان جهاز يستخدم لبدء والتحكم في عدد النيوترونات المتفاعلة مع اليورانيوم للبقاء على سلسلة تفاعلات نووية مستدامة، من دون زيادة للتفاعل حتى لا يحدث انفجار. ويتم تحديد عدد النيوترونات المتفاعلة مع أنوية اليورانيوم بواسطة قضبان من الكادميوم التي تمتص النيوترونات الزائدة.

تستخدم المفاعلات النووية في محطات الطاقة النووية لتوليد الكهرباء ودفع السفن والغواصات. أحد أنواع المفاعلات النووية هو مفاعل الماء الخفيف الذي يعمل باليورانيوم المخصب - به نحو 5و3 % من اليورانيوم-235 القابل للانشطار عند امتصاصه نيوترونا - وتبلغ كمية اليورانيوم المخصب فيه نحو 100 طن. تعمل الطاقة الحرارية الناتجة على تسخين الماء المحيط باليورانيوم حتى درجة الغليان، فيتولد بخار عند ضغط عالي. هذه "الكومة" الذرية الغاطسة في الماء موجودة داخل صهريج المفاعل (انظر الشكل). يتم نقل البخار عالي الضغط عبر التوربينات البخارية فيدور. يمكن استغلال دوران التوربين في دفع مراوح السفينة أو لإدارة المولدات الكهربائية. ويمكن استخدام الماء الساخن المتولد من تفاعل انشطار اليورانيوم من حيث المبدأ في العمليات الصناعية أو للتدفئة في المناطق الباردة. ولكن يجب معرفة أيضا أن الماء المحيط بالكومة الذرية يصبح مشعا مع الوقت ولا يصلح للاستخدام المدني، لهذا يتم تدويره في مبادل حراري تنتقل فيه الحرارة من ماء المفاعل إلى ماء آخر نظيف يمكن استغلاله. أي تكون في المفاعل دورتان للمياه : دورة أولية داخل المفاعل، ودورة ثانوية خارج المفاعل، والأخيرة تكون نظيفة ويمكن استغلال حرارتها في الأغراض المدنية.

كما تستخدم بعض المفاعلات النووية الصغيرة لإنتاج نظائر مشعة للاستخدام الطبي والصناعي، أو لإنتاج البلوتونيوم-239 من اليورانيوم الطبيعي - بستخدم البلوتونيوم-239 في صنع الأسلحة النووية. كما يمكن استخدام البلوتونيوم-239 بعد خلطه بنسبة نحو 4 % مع اليورانيوم الطبيعي في تشغيل مفاعل نووي يولد الكهرباء. كما توجد مفاعلات صغيرة أيضا لأغراض البحث العلمي - حيث تستخدم النيوترونات الناتجه فيه في فحص المواد والتعرف على تركيب المواد، وتحليل الشوائب في الأنهار والبحار والهواء. وحتى نيسان / أبريل 2014، أبلغت الوكالة الدولية للطاقة الذرية عن وجود 435 مفاعلا للطاقة النووية في 31 بلد حول العالم[1]

بشكل عام، هناك نوعان من المفاعلات النووية، نوع يستخدم في محطات الطاقة النووية لتوفير الطاقة اللازمة لإنتاج الكهرباء ومن الأمثلة عليه مفاعل القدرة المائي-المائي الروسي (بالإنجليزية: Water-Water Energetic Reactor)، وكذلك مفاعل الماء الخفيف (بالإنجليزية: Light-water reactor)، كما يستخدم أيضاً في تسيير السفن والغواصات. وتعمل تلك المفاعلات عند درجات حرارة عالية، وضغط للبخار عالي يصل إلى نحو 400 ضغط جوي. من في تلك المفاعلات يتم انتقال الحرارة الناتجة من الانشطار النووي إلى سوائل التشغيل (مثل الماء أو غاز)، وينتج من مفاعل الماء الخفيف البخار عال الحرارة والضغط الذي يمر بدوره عبر توربينات لتويره. وتقوم تلك التوربينات بتحريك مراوح السفينة أو بتدوير المولدات الكهربائية. ويمكن استخدام الماء الساخن المتولد من تلك المفاعلات من حيث المبدأ في الأغراض الصناعية أو استخدامه لإنتاج ماء عذب من مياه البحر عن طريق تحلية المياه أو استغلاله لتدفئة البيوت في المناطق الباردة.

أما النوع الآخر من المفاعلات فتعمل على توفير الإشعاع الذري من نيوترونات وأشعة غاما، وتستغل النيوترونات لإنتاج الوقود النووي، مثل إنتاج البلوتونيوم أو لإنتاج نظائر مشعة لاستخدامها في الطب أو في الصناعة بواسطة التصوير بالأشعة لمعرفة سلامة الأجزاء المصنعة وسلامتها من الشقوق. كما يستخدم لأغراض البحث العلمي ولأغراض أخرى مثل تحويل عناصر كيميائية معينة إلى عناصر أخرى أو لإزالة الأملاح والمعادن من الماء للحصول على الماء النقي (تحلية الماء) أو لإنتاج البلوتونيوم-239 لتصنيع الأسلحة النووية.

جميع المفاعلات النووية تتكون من وعاء ثقيل يشبه الصهريج أو الخزَّان ويسمى وعاء المفاعل أو وعاء الضغط يحوي داخله "قلب" (بالإنجليزية: Core) من الوقود النووي. معظم المفاعلات تحتوي أيضاً على "مُهَدِّئ" (بالإنجليزية: Moderator) لإبطاء سرعة النيوترونات إلى النقطة التي يمكن عندها جعل التفاعل المتسلسل يدوم دون أن يتوقف أو يزيد عن الحد يمكن أن يكون المهديء هو الماء. كل المفاعلات تحتوى أيضاً على "مُبَرِّد" (بالإنجليزية: Coolant) للتحديد درجة حرارة قضبان اليورانيوم حتى لا يصيبها الضرر فيفسد المفاعل - ما عدا المفاعلات ذات الطاقة المنخفضة جداً فيمكن أن يكون المهديء فيها الجرافيت. ويتم تنظيم سرعة التفاعل النووي أو "السيطرة عليه" من خلال "نظام للتحكم" (بالإنجليزية: Control System) المكون من قضبان كادميوم تمتص النيوترونات الزائدة عند تغطيسها في قلب المفاعل بين قضبان اليورانيوم، فيتم التفاعل المتسلسل هادئا. كما تُفْرَض احتياطات للسلامة صارمة جداً في تشغيل المفاعلات، ومعالجة منتوجات التفاعل الثانوية المشعة والتخلص من النفايات الخطرة.

ويتوقع بعض الخبراء نقصاً في الطاقة الكهربائية المتولدة من الوقود النووي بسبب مقاومة بعض التجمعات السكنية التي لا ترغب في توليد الطاقة من اليورانيوم لخطورتها في حالة الانفجار. توجد تلك التجمعات في بلاد عديدة مثل ألمانيا والنمسا وإيطاليا، وهذا على الرغم من ظاهرة الاحتباس الحراري التي تسببها الانبعاثات الناتجة عن توليد الطاقة الكهربائية باستخدام الفحم والنفط والأنشطة البشرية الأخرى مثل الانبعاثات الناتجة عن عمليات تكرير النفط وعوادم السيارات وغيرها. لذا فهناك اعتقاد سائد بأن الطاقة النووية هي السبيل الأمثل لسد هذا النقص في المستقبل، مع استبدال وقود السيارات الحالي ببطاريات كهربائية وتعميم السيارات الكهربائية.












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