Rev. 13 STP 3 4 Final Safety Analysis Report Tier 2
403B. Room 430B provides a separate fire area F4303 between room 430A (fire area F4301) and room 410 (fire area F4101). There is a 3hour fire rated door at each end of room 430B providing a vestibule between room 430A and room 410. The floors and walls of room 430B serve as fire barriers and are of 3hour fireresistive concrete construction.