Nuclear Energy: Science, Systems and Society

<div class="xblock xblock-public_view xblock-public_view-vertical" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="VerticalStudentView" data-request-token="4f5d15162fec11f195130ea3b3d414b7" data-has-score="False" data-usage-id="block-v1:MITx+22.011x+3T2018+type@vertical+block@7a6dbb839de6411cae9450858c8ad1d3" data-block-type="vertical" data-runtime-version="1" data-runtime-class="LmsRuntime" data-graded="True"> <h2 class="hd hd-2 unit-title">2.1.4. Required Assessment</h2> <div class="vert-mod"> <div class="vert vert-0" data-id="block-v1:MITx+22.011x+3T2018+type@problem+block@9cd14b94f5924e7b837c3b92793a70a8"> <div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="XBlockToXModuleShim" data-request-token="4f5d15162fec11f195130ea3b3d414b7" data-has-score="True" data-usage-id="block-v1:MITx+22.011x+3T2018+type@problem+block@9cd14b94f5924e7b837c3b92793a70a8" data-block-type="problem" data-runtime-version="1" data-runtime-class="LmsRuntime" data-graded="True"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "Problem"} </script> <div id="problem_9cd14b94f5924e7b837c3b92793a70a8" class="problems-wrapper" role="group" aria-labelledby="9cd14b94f5924e7b837c3b92793a70a8-problem-title" data-problem-id="block-v1:MITx+22.011x+3T2018+type@problem+block@9cd14b94f5924e7b837c3b92793a70a8" data-url="/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@problem+block@9cd14b94f5924e7b837c3b92793a70a8/handler/xmodule_handler" data-problem-score="0" data-problem-total-possible="1" data-attempts-used="0" data-content=" <h3 class="hd hd-3 problem-header" id="9cd14b94f5924e7b837c3b92793a70a8-problem-title" aria-describedby="block-v1:MITx+22.011x+3T2018+type@problem+block@9cd14b94f5924e7b837c3b92793a70a8-problem-progress" tabindex="-1"> Assessment 1 </h3> <div class="problem-progress" id="block-v1:MITx+22.011x+3T2018+type@problem+block@9cd14b94f5924e7b837c3b92793a70a8-problem-progress"></div> <div class="problem"> <div> <div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_9cd14b94f5924e7b837c3b92793a70a8_2_1"> <fieldset aria-describedby="status_9cd14b94f5924e7b837c3b92793a70a8_2_1 description_9cd14b94f5924e7b837c3b92793a70a8_1_1"> <legend id="9cd14b94f5924e7b837c3b92793a70a8_2_1-legend" class="response-fieldset-legend field-group-hd">Why can a PWR not operate with the water coolant at atmospheric pressure?</legend> <p class="question-description" id="description_9cd14b94f5924e7b837c3b92793a70a8_1_1">Please select all that apply </p> <div class="field"> <input type="checkbox" name="input_9cd14b94f5924e7b837c3b92793a70a8_2_1[]" id="input_9cd14b94f5924e7b837c3b92793a70a8_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="9cd14b94f5924e7b837c3b92793a70a8_2_1-choice_0-label" for="input_9cd14b94f5924e7b837c3b92793a70a8_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_9cd14b94f5924e7b837c3b92793a70a8_2_1 description_9cd14b94f5924e7b837c3b92793a70a8_1_1"> If the PWR operated at low pressure, the water coolant would easily boil in the core </label> </div> <div class="field"> <input type="checkbox" name="input_9cd14b94f5924e7b837c3b92793a70a8_2_1[]" id="input_9cd14b94f5924e7b837c3b92793a70a8_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="9cd14b94f5924e7b837c3b92793a70a8_2_1-choice_1-label" for="input_9cd14b94f5924e7b837c3b92793a70a8_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_9cd14b94f5924e7b837c3b92793a70a8_2_1 description_9cd14b94f5924e7b837c3b92793a70a8_1_1"> Operating at \(1 atm\) would limit reactor coolant and steam turbine temperatures to less than \(100 C\), thus realizing a very low thermal efficiency </label> </div> <div class="field"> <input type="checkbox" name="input_9cd14b94f5924e7b837c3b92793a70a8_2_1[]" id="input_9cd14b94f5924e7b837c3b92793a70a8_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="9cd14b94f5924e7b837c3b92793a70a8_2_1-choice_2-label" for="input_9cd14b94f5924e7b837c3b92793a70a8_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_9cd14b94f5924e7b837c3b92793a70a8_2_1 description_9cd14b94f5924e7b837c3b92793a70a8_1_1"> It is hard to design a reactor vessel that can take atmospheric pressure </label> </div> <span id="answer_9cd14b94f5924e7b837c3b92793a70a8_2_1"/> </fieldset> <div class="indicator-container"> <span class="status unanswered" id="status_9cd14b94f5924e7b837c3b92793a70a8_2_1" data-tooltip="Not yet answered."> <span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/> </span> </div> </div></div> </div> <div class="action"> <input type="hidden" name="problem_id" value="Assessment 1" /> <div class="submit-attempt-container"> <button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_9cd14b94f5924e7b837c3b92793a70a8" > <span class="submit-label">Submit</span> </button> <div class="submission-feedback" id="submission_feedback_9cd14b94f5924e7b837c3b92793a70a8"> <span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span> </div> </div> <div class="problem-action-buttons-wrapper"> </div> </div> <div class="notification warning notification-gentle-alert is-hidden" tabindex="-1"> <span class="icon fa fa-exclamation-circle" aria-hidden="true"></span> <span class="notification-message" aria-describedby="9cd14b94f5924e7b837c3b92793a70a8-problem-title"> </span> <div class="notification-btn-wrapper"> <button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button> </div> </div> <div class="notification warning notification-save is-hidden" tabindex="-1"> <span class="icon fa fa-save" aria-hidden="true"></span> <span class="notification-message" aria-describedby="9cd14b94f5924e7b837c3b92793a70a8-problem-title">None </span> <div class="notification-btn-wrapper"> <button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button> </div> </div> <div class="notification general notification-show-answer is-hidden" tabindex="-1"> <span class="icon fa fa-info-circle" aria-hidden="true"></span> <span class="notification-message" aria-describedby="9cd14b94f5924e7b837c3b92793a70a8-problem-title">Answers are displayed within the problem </span> <div class="notification-btn-wrapper"> <button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button> </div> </div> </div> " data-graded="True"> <p class="loading-spinner"> <i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i> <span class="sr">Loading…</span> </p> </div> </div> </div> <div class="vert vert-1" data-id="block-v1:MITx+22.011x+3T2018+type@problem+block@6cead109d89d4108ab3221a4e8297efb"> <div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="XBlockToXModuleShim" data-request-token="4f5d15162fec11f195130ea3b3d414b7" data-has-score="True" data-usage-id="block-v1:MITx+22.011x+3T2018+type@problem+block@6cead109d89d4108ab3221a4e8297efb" data-block-type="problem" data-runtime-version="1" data-runtime-class="LmsRuntime" data-graded="True"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "Problem"} </script> <div id="problem_6cead109d89d4108ab3221a4e8297efb" class="problems-wrapper" role="group" aria-labelledby="6cead109d89d4108ab3221a4e8297efb-problem-title" data-problem-id="block-v1:MITx+22.011x+3T2018+type@problem+block@6cead109d89d4108ab3221a4e8297efb" data-url="/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@problem+block@6cead109d89d4108ab3221a4e8297efb/handler/xmodule_handler" data-problem-score="0" data-problem-total-possible="1" data-attempts-used="0" data-content=" <h3 class="hd hd-3 problem-header" id="6cead109d89d4108ab3221a4e8297efb-problem-title" aria-describedby="block-v1:MITx+22.011x+3T2018+type@problem+block@6cead109d89d4108ab3221a4e8297efb-problem-progress" tabindex="-1"> Assessment 2 </h3> <div class="problem-progress" id="block-v1:MITx+22.011x+3T2018+type@problem+block@6cead109d89d4108ab3221a4e8297efb-problem-progress"></div> <div class="problem"> <div> <div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_6cead109d89d4108ab3221a4e8297efb_2_1"> <fieldset aria-describedby="status_6cead109d89d4108ab3221a4e8297efb_2_1 description_6cead109d89d4108ab3221a4e8297efb_1_1"> <legend id="6cead109d89d4108ab3221a4e8297efb_2_1-legend" class="response-fieldset-legend field-group-hd">Why does uranium have to be &#8216;enriched&#8217; in U-235 for use in a LWR?</legend> <p class="question-description" id="description_6cead109d89d4108ab3221a4e8297efb_1_1">Please select all that apply </p> <div class="field"> <input type="checkbox" name="input_6cead109d89d4108ab3221a4e8297efb_2_1[]" id="input_6cead109d89d4108ab3221a4e8297efb_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="6cead109d89d4108ab3221a4e8297efb_2_1-choice_0-label" for="input_6cead109d89d4108ab3221a4e8297efb_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_6cead109d89d4108ab3221a4e8297efb_2_1 description_6cead109d89d4108ab3221a4e8297efb_1_1"> It is cheaper than natural uranium </label> </div> <div class="field"> <input type="checkbox" name="input_6cead109d89d4108ab3221a4e8297efb_2_1[]" id="input_6cead109d89d4108ab3221a4e8297efb_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="6cead109d89d4108ab3221a4e8297efb_2_1-choice_1-label" for="input_6cead109d89d4108ab3221a4e8297efb_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_6cead109d89d4108ab3221a4e8297efb_2_1 description_6cead109d89d4108ab3221a4e8297efb_1_1"> It makes up for increased neutron absorptions in the water coolant/moderator </label> </div> <div class="field"> <input type="checkbox" name="input_6cead109d89d4108ab3221a4e8297efb_2_1[]" id="input_6cead109d89d4108ab3221a4e8297efb_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="6cead109d89d4108ab3221a4e8297efb_2_1-choice_2-label" for="input_6cead109d89d4108ab3221a4e8297efb_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_6cead109d89d4108ab3221a4e8297efb_2_1 description_6cead109d89d4108ab3221a4e8297efb_1_1"> It increases the number of neutrons per fission </label> </div> <div class="field"> <input type="checkbox" name="input_6cead109d89d4108ab3221a4e8297efb_2_1[]" id="input_6cead109d89d4108ab3221a4e8297efb_2_1_choice_3" class="field-input input-checkbox" value="choice_3"/><label id="6cead109d89d4108ab3221a4e8297efb_2_1-choice_3-label" for="input_6cead109d89d4108ab3221a4e8297efb_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_6cead109d89d4108ab3221a4e8297efb_2_1 description_6cead109d89d4108ab3221a4e8297efb_1_1"> It ensures the reactor can run longer before needing to be refueled </label> </div> <span id="answer_6cead109d89d4108ab3221a4e8297efb_2_1"/> </fieldset> <div class="indicator-container"> <span class="status unanswered" id="status_6cead109d89d4108ab3221a4e8297efb_2_1" data-tooltip="Not yet answered."> <span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/> </span> </div> </div></div> </div> <div class="action"> <input type="hidden" name="problem_id" value="Assessment 2" /> <div class="submit-attempt-container"> <button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_6cead109d89d4108ab3221a4e8297efb" > <span class="submit-label">Submit</span> </button> <div class="submission-feedback" id="submission_feedback_6cead109d89d4108ab3221a4e8297efb"> <span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span> </div> </div> <div class="problem-action-buttons-wrapper"> </div> </div> <div class="notification warning notification-gentle-alert is-hidden" tabindex="-1"> <span class="icon fa fa-exclamation-circle" aria-hidden="true"></span> <span class="notification-message" aria-describedby="6cead109d89d4108ab3221a4e8297efb-problem-title"> </span> <div class="notification-btn-wrapper"> <button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button> </div> </div> <div class="notification warning notification-save is-hidden" tabindex="-1"> <span class="icon fa fa-save" aria-hidden="true"></span> <span class="notification-message" aria-describedby="6cead109d89d4108ab3221a4e8297efb-problem-title">None </span> <div class="notification-btn-wrapper"> <button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button> </div> </div> <div class="notification general notification-show-answer is-hidden" tabindex="-1"> <span class="icon fa fa-info-circle" aria-hidden="true"></span> <span class="notification-message" aria-describedby="6cead109d89d4108ab3221a4e8297efb-problem-title">Answers are displayed within the problem </span> <div class="notification-btn-wrapper"> <button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button> </div> </div> </div> " data-graded="True"> <p class="loading-spinner"> <i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i> <span class="sr">Loading…</span> </p> </div> </div> </div> </div> </div>