Document: NUREG-0800
Document ID: a28650b3-fa03-428d-a2bd-4a27f583710b
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070484.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6
CFR Part: 
CFR Title: 

Content:
ooling requirements are met. b. Transient Bypass Capability Analyses Transient analyses should be provided to establish the capability for a small break. A normal plant shutdown time of 6 hours should be assumed. The results and bases for the analyses should be provided including the following: the pressure history in the drywell and the wetwell; identification and quantification of the static heat sinks and the condensing heat transfer coefficient; spray capacity, efficiency, coverage, start time and temperature history; identification and quantification of heat sources. 2. Leakage Tests and Surveillance Requirements a. High-Pressure Leak Test A single preoperational high-pressure leakage test should be performed on each (Mark II and Mark III) unit. The purpose of this test is to detect leakage in the drywell to suppression chamber vent piping, penetrations, downcomers, vacuum breakers, floor seals, vent seals, and the diaphragm. This test should be performed at approximately the peak drywell to wetwell differential pressure following the high-pressure structural test of the diaphragm. b. Low-Pressure Leak Tests A post-operational low pressure leakage test should be performed on each Mark I, II and III unit to detect leakage in the drywell to suppression chamber vent piping, penetration downcomers, vacuum breakers, floor seals, vent seals, and the diaphragm. This test should be performed at each refueling outage at a differential pressure corresponding to approximately the submergence of the vents. DRAFT Rev. 7 - April 1996 6.2.1.1.C-16 c. Acceptance Criteria for Leakage Tests The Mark II and Mark III acceptance criteria for both the high and low pressure leakage tests shall be a measured bypass leakage which is less than 10% of the capability of the containment as defined in Position B.1 above. For Mark I containment the acceptance criterion is that the measured leakage is not greater than the leakage that could result from a 2.54 cm (one inch) diameter opening.