Mechanical and 1st Chemical Cleaning of NEK Steam Generators
نویسندگان
چکیده
Sludge removal is performed on two steam generators (SG’s) at the Krško Nuclear Power Plant (NEK) during every outage. SG’s are a meeting point of five major plant systems: Reactor Coolant System (RC) primary side and four systems secondary – Auxiliary Feedwater (AF), Blowdown (BD), Main (FW), Steam (MS). activities take place top tube sheet. It always consists classical Lancing (SL) which done by spraying water different angles (30°, 90°, 150°) between gaps in generator bundle with pressure around 220 bars. Another method Inner Bundle (IBL) means directly inside traveling lance tape nozzle end. Water sprayed an angle or sheet robot-guided manipulator placed generator. The therefore action controlled operator times it fully autonomous to provide highest protection measures possible. sludge was for first time utilized 2019 site Chemical Cleaning (CC) both SG’s. During this process, chemical injected into through BD system periodically pumped create dynamic flow maximize cleaning effect. To achieve best results, constant temperature chemicals had be maintained all times. Upon completion cleaning, rinsing phase followed remove any post-treatment chemicals. After activities, televisual inspection (TVI) access hard area search potential foreign objects If instance object importance TV found, attempt retrieve would usually place. Other methods such as upper flushing ultrasonic have not been implemented NEK thus far.
 Since power uprate May 2000, conducted SL outage also starting IBL 2013 2015, same used 2018 2019, three (SL, IBL, CC) main purpose extend full load operation plant, preventing and/or stopping denting processes from occurring, reducing build-up increase/sustain efficiency found U-tubes barrier coolant environment. Therefore, crucial keep level integrity because leak could potentially mean release radioactive material atmosphere. This paper describes workflow NEK.
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ژورنال
عنوان ژورنال: Energija
سال: 2023
ISSN: ['0354-8651', '2812-7528']
DOI: https://doi.org/10.37798/2022712413