b'Figure 2. RELAP Predictions ofThese predictions were compareddriven forced circulation. All three LOCA-SERTTA Testing Method. to the same metrics obtained from adevices were found to offer adequate RELAP model of a typical pressurizedpost blowdown pressure to permit water reactor plant. cladding differential pressure to drive Accomplishments:ballooning phenomena.The design and analysis team iter- LOCA-SERTTAs use of a 20 pellet ated on several engineering androdlet and small steam suppression operating parameters in comparingpool at the bottom its expansion these three candidate irradiationtank enabled adequate performance devices. LOCA-SERTTA was found toin a compact geometric envelope be remarkably effective in simulatingable to be fit entirely within existing the pre-blowdown conditions bysafety containment structures at using a brief period of nucleateTREAT; a major boon for the pros-boiling from the rod to enhance heatpect of near-term cost-effective transfer. Super-SERTTA was foundtesting. Super-SERTTAs tall water to be effective in this regard bycolumn was shown to significantly using a tall column of water aidedquench the fuel rod as water rushed by natural circulation. TWERL wasout during blowdown and created naturally found to produce the mostchallenges with representing the representative pre-blowdown heatdesired temperature response. transfer conditions due to pump-110 2020|AFC ACCOMPLISHMENTS'