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<h2 class="hd hd-2 unit-title">2.1.4. Video Lecture</h2>
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<h2 class="hd hd-2 unit-title">2.1.4. Required Assessment</h2>
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Assessment 1
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<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>
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<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
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<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
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<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
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Assessment 2
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<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>
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<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
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<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
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<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
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<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
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<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>
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