<p>[Office</a> of Undergraduate Advising: Change of College](<a href=“http://ls-advise.berkeley.edu/registration/changeofcollege.html]Office”>http://ls-advise.berkeley.edu/registration/changeofcollege.html)</p>
<p>You would go into L&S undeclared unless you have completed the courses to declare the physics major. The physics major is not capped, so you can then declare it as soon as you complete the prerequisite courses (Physics 7A-7B-7C or the honors versions, Math through 53 and 54 or the honors versions).</p>
<p>There is no hurry, since the first year or two of nuclear engineering includes substantially similar courses as physics (including the physics and math courses), so you won’t be “behind”. Some of the additional lower division courses specified for nuclear engineering majors, such as Nuclear Engineering 92 and Engineering 7, may be of interest or use to you anyway if you go into physics emphasizing nuclear reaction subjects. Additional upper division nuclear engineering courses such as Nuclear Engineering 180 may be of interest to you to supplement your physics major.</p>