2017-5-25 · The replacement steam generators have been certified by France''s nuclear authority as compliant with the country''s strict regulatory requirements on April 28, 2017. The replacement steam generators for the 900 MWe pressurized water reactor (PWR) nuclear power plant were ordered in 2010.
2019-10-20 · Deposits inside steam generator remains a concern for the utilities in term of safety, performance and steam generator lifetime. Various lancing technics are used as a preventive method to address this issue in European utilities. Typically lancing are as conductedoverall, localized or in -bundle lancing. Despite the
The research to develop a lancing system that would remove sludge deposits from the tubesheet of a steam generator was started in 1998 by the Korea Electric Power Research Institute (KEPRI) of the ...
1994-12-31 · OSTI.GOV Journal Article: ABB Combustion Engineering approach to steam generator sludge lancing. ABB Combustion Engineering approach to steam generator sludge lancing. Full Record; Other Related Research ...
During plant operation, corrosion products from feedwater, drain and condensate system accumulate on the secondary side of steam generator in form of scaled deposits around the tubes and sludge piles on top of the tubesheet. These deposits increase potential for corrosion, affect fluid flow and reduce heat transfer efficiency of the steam generator. Using data obtained during periodical eddy ...
2021-8-16 · Cyclone steam separators employ centrifugal force, change in direction and reduction in velocity to ensure 99% of droplets greater than 10 microns do not pass though the separator. Our cyclone steam separators have no internal moving parts or serviceable …
2018-6-8 · Wear Prediction of Steam Generator Tubes due to Shell Side Foreign Objects Hyung-Nam KIM 1, Hyun-Joo YOO and Ki-Wahn RYU2; 1KEPCO Research Institute, 103-16 Munji-Dong, Yuseong-Gu, Daejeon 305-380, Korea 2Department of Aerospace Engineering, Chonbuk National University, 664-14 Deokjin 1-Ga, Jeonju, Jeonbuk 561-756, Korea (Received September 3, 2009 and accepted in …
2019-12-19 · of steam generators and must be removed to prevent pitting, intergranular stress corrosion cracking and other forms of tube degradation. During the sludge lancing process, work is performed using the highly radioactive hand holes, and workers spend a significant amount of time in close proximity to the generator''s outer surface.
heating steam > 6 bar are available Drum dryer (DDS) for medium to large evapo-ration capacities Wto make use of natural gas, biogas, or heating oil if granulate has to meet strin - gent demands (for fer tilizer) Dewatered sewage sludge evaporated water for cleaning Exhaust air treatment Preferred heating systems Drum drying system (DDS)
Abstract: Recently, the requirements to perform a program for soundness of Steam Generator tube such as FOSAR(Foreign Object Search and Retrieval), ECT have been strengthened in general. CANDU type Steam Generator is hardly defective but the results of a diagnostic program may be affected by structural characteristics of Steam Generator model, retention of optimized test equipment, operation ...
2016-11-14 · In steam generator with many years of operation, • Equipment access restriction due to hard sludge • Difficult to access for foreign objects inspection • ECT Detectivity effect : Co-existence of non-contact non-magnetic foreign objects and sedimentary sludge Effect …
2015-3-4 · Anti-Vibration Bar Positioning and Sludge Evaluation Information Concerning the Spring 2014 Steam Generator Inspections Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 1. Entergy letter to NRC, "Steam Generator Tube Inspection Report - 2R23," dated August 18, 2014 (2CAN081404) (ML14230A898) 2.
Steam generator sludge removal system: 1978-03-21: Hickman et al. 122/382: 3924805: Method and apparatus for producing and utilizing percussive liquid jets: 1975-12-09: Nebeker et al. 239/101: 3311092: Type sootblower for cleaning the tubes of furnace walls: 1967-03-28: McMahon et al. 122/392: 2933259: Nozzle head: 1960-04-19: Raskin: 239/549 ...
2014-10-7 · Steam Generator Secondary Side Water Lancing Westinghouse sludge lancing systems effectively and efficiently remove accumulated sludge on tubesheet surfaces for both square and triangular-pitched SGs. With more than 30 years of sludge lancing design and operations experience, Westinghouse offers proven solutions for a broad range of site ...
The sludge of the Kori Unit 1 steam generator, far example, was found to be composed of 93% ferrous oxide, 3% carbon and 1% of silica oxide and nickel oxide each. The research to develop a lancing system that would remove sludge deposits from the
This high-pressure system for square or triangular pitch steam generators enables fixed water jets to maintain tight water columns that penetrate completely through the SG tube bundle. This process transfers all of the energy to locations containing the most sludge and effectively removes hard collars.
2000-8-1 · The steam generators (SG''s) of the pressurized water reactor (PWR) nuclear steam supply system (NSSS) have the important role of extracting heat from the primary coolant for the production of steam which drives the turbine. They also act as a barrier between the primary fluid system and the ''balance of plant'' (BOP) secondary system.
2009-1-8 · Patent application title: STEAM GENERATOR DUAL HEAD SLUDGE LANCE AND PROCESS LANCING SYSTEM Inventors: Eric R. HABERMAN Agents: WESTINGHOUSE ELECTRIC COMPANY, LLC Assignees: Origin: PITTSBURGH, PA US IPC8 Class: AF22B3748FI USPC Class: 376316 Abstract: A method of cleaning sludge from the tube sheet (34) of a nuclear steam generator (10) includes introducing a moveable sludge …
2020-10-16 · 02.07 Sludge Lancing. Review the sludge lancing history to determine whether the licensee has maintained an ongoing program for removing sludge from the steam generators. Review the following subjects: a. The quantity of sludge that was removed in refueling outages by lancing the steam generator …
The water impurities and corrosion products of the nuclear power plant structure form sludge outside the steam generator tube (SGT), which decreases the energy exchange efficiency resulting in tremendous economic loss and may lead to serious defects posing a threat to the safe operation. Thus, it is critical to efficiently inspect the deposition of sludge outside SGT.
A system (70) and a method for removing sludge and debris from the interior of the secondary side (5) of a nuclear steam generator (1). The method comprises the steps of introducing a sufficient amount of water in the secondary side (5) to submerge at least the tubesheet (7), generating a succession of shock waves in the water by means of pulses of pressurized gas to create shock waves that ...
2006-12-17 · Abstract: Steam generators are critical components of a nuclear power plant and play an important role in the availability of the plant. Hard sludge deposits formed in the tube sheets of the steam generator leading to tube corrosion and degraded thermal performance, are major concerns in the life management program of this crucial component.
Sludge weight removed during the deposit removal operation was 10.68 kg. Annulus, tubelane, and in-bundle area of the steam generators were searched for possible foreign objects. Three foreign objects were found and removed. Mock-up training before the operation wa
1994-12-31 · Estes, G T. Sat . "ABB Combustion Engineering approach to steam generator sludge lancing". United States. abstractNote = {During the normal operation of a recirculating steam generator, insoluble corrosion products, commonly called {open_quotes}sludge, {close_quotes} are formed. Sludge accumulates on the tube sheet, heat transfer tubes, support ...
1995-9-28 · A steam generator lancing system for cleaning tubes and tubesheets of a steam generator. The lancing system includes a nozzle block including at least one nozzle adapted for fluid communication with a high pressure hose. The lancing system also includes a support assembly including a carrier for transporting the nozzle block through the steam ...
Robotic Steam Generator Maintenance CECIL (Consolidated Edison Combined Inspection and Lancing) is a robotic steam generator maintenance system that provides secondary side maintenance. The CECIL robot is remotely operated and can perform secondary side visual inspections, soft and hard sludge removal, sludge sampling, and both in-bundle and ...
A b s t r a c t Periodic sludge lancing enhances steam generator life by mitigating corrosion between its tubes and tube sheet. The present modular sludge lancing equipment has been designed to ...
2018-12-20 · 2017. The lancing system is composed of a flexible rail, a flexible lance guide, and a flexible lance. The flexible rail uses permanent magnets to be firmly attached to the annulus wall of the steam generator. It could be installed in almost all types of steam generators. Therefore, even though the technology was developed for Wolsong steam ...
Following the guideline for PED regulations the displacement volume from the CERTUSS Generator, does not warrant the requirement for a standard blow-down vessel, (EN2871 3 standard), as required for conventional steam boilers, which displace a large volume of water/sludge under pressure.
2020-8-4 · bundle interior, remove sludge without damaging tubes, identify and remove foreign objects, and at the same time reduce personnel exposure to radiation. CECIL (Consolidated Edison Combined Inspection and Lancing) is a robotic steam generator maintenance system developed for secondary side maintenance. By accessing
2004-8-1 · 1.2 Steam Generator Cleaning Methods: Water Lancing and Chemical Cleaning Over 1989 and 1990, boiler water level oscillations observed in Unit 2 and in Unit 1 led to unit deratings. The oscillations resulted from broach hole blockage caused by a buildup of secondary-side deposits. Subsequent boiler problems also linked to the