{"id":38112,"date":"2024-02-06T23:10:51","date_gmt":"2024-02-06T23:10:51","guid":{"rendered":"https:\/\/www.alicat.com\/?post_type=article&#038;p=38112"},"modified":"2026-01-06T23:02:12","modified_gmt":"2026-01-06T23:02:12","slug":"graftel-pruft-die-funktion-von-sensoren-in-nuklearen-leckuberwachungsanlagen","status":"publish","type":"post","link":"https:\/\/www.alicat.com\/de\/articles\/graftel-verifies-sensor-operation-in-nuclear-leak-monitoring-equipment\/","title":{"rendered":"Graftel pr\u00fcft die Funktion von Sensoren in nuklearen Leck\u00fcberwachungsanlagen"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;2em||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_heading title=&#8221;Graftel Verifies Sensor Operation in Nuclear Leak Monitoring Equipment&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_css_free_form=&#8221;selector h1 {||  text-wrap: pretty;||}&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2026\/01\/graftel-leakage-rate-test-monitors.webp&#8221; alt=&#8221;Graftel models 9623 Model S LLRT and 9623 Model EV&#8221; align=&#8221;center&#8221; force_fullwidth=&#8221;on&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;1.5rem||||false|false&#8221; hover_enabled=&#8221;0&#8243; custom_css_free_form=&#8221;selector img {||  object-fit: cover;||}&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; module_id=&#8221;article-hero-image&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_image][et_pb_divider color=&#8221;#2A3B47&#8243; divider_weight=&#8221;2.5px&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; height=&#8221;0px&#8221; custom_margin=&#8221;3rem||3rem||true|false&#8221; custom_margin_tablet=&#8221;3rem||3rem||true|false&#8221; custom_margin_phone=&#8221;2rem||2rem||true|false&#8221; custom_margin_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||true|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p>Founded in 1991 and headquartered in Roselle, Illinois, <a href=\"https:\/\/www.graftel.com\/\" target=\"_blank\" rel=\"noopener\">Graftel<\/a> has emerged as the industry leader for nuclear facility leakage rate monitoring in the US. Regular monitoring both satisfies federal NRC regulations and serves as a preventative measure to help keep the working environment safe for power plant employees. From portable local leakage rate tests (LLRTs) to building\u2011scale integrated leakage rate tests (ILRTs), Graftel is the preferred partner in testing for leakages at more than 90% of America\u2019s nuclear power plants, as well as many others around the world.<\/p>\n<p>[\/et_pb_text][et_pb_heading title=&#8221;Integrated leak rate test verification&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; title_level=&#8221;h3&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;8px||0px||false|false&#8221; custom_padding=&#8221;||2rem|2rem|false|false&#8221; custom_padding_tablet=&#8221;|||2rem|false|false&#8221; custom_padding_phone=&#8221;||2rem|0rem|false|false&#8221; custom_padding_last_edited=&#8221;on|phone&#8221; custom_css_main_element=&#8221;float: right;&#8221; custom_css_free_form=&#8221;selector figure {||  display: table;||  margin-left: auto;||  margin-right: auto;||  text-align: center;||}||||selector figcaption {||  caption-side: bottom;||  display: table-caption;||}||||selector img {||  margin-bottom: 1rem;||}&#8221; global_colors_info=&#8221;{}&#8221; custom_css_main_element_tablet=&#8221;float: right;&#8221; custom_css_main_element_phone=&#8221;float: none;&#8221; custom_css_main_element_last_edited=&#8221;on|phone&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<figure><img decoding=\"async\" width=\"225\" height=\"300\" src=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/05\/Graftel_AlicatScientific.jpg\" alt=\"A Graftel LLRT Specialist displays their LLRT monitor\" class=\"wp-image-41245 aligncenter size-full\" \/><\/p><figcaption>A Graftel LLRT Specialist displays their LLRT monitor (Model 9623).<\/figcaption><\/figure>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p>The <a href=\"https:\/\/www.nrc.gov\/\" target=\"_blank\" rel=\"noopener\">Nuclear Regulatory Commission (NRC)<\/a> requires that all nuclear power plants undergo regular testing to ensure they comply with containment leakage requirements according to <a href=\"https:\/\/www.nrc.gov\/reading-rm\/doc-collections\/cfr\/part050\/part050-appj.html\" target=\"_blank\" rel=\"noopener\">NRC 10 CFR 50 Appendix J<\/a>. The requirements include three types of testing:<\/p>\n<ul>\n<li><span>Type A tests measure the overall integrated leakage rate for the primary reactor containment.<\/span><\/li>\n<li><span>Type B tests measure local leakage for primary reactor containment penetrations, including airlocks and electrical penetrations.<\/span><\/li>\n<li><span>Type C tests measure containment isolation valve leakage rates.<\/span><\/li>\n<\/ul>\n<p>Graftel invented their smart sensor technology for <a href=\"https:\/\/www.graftel.com\/services\/ilrt-services\/\" target=\"_blank\" rel=\"noopener\">Type A ILRTs<\/a> in 1993. Since then, Graftel\u2019s ILRT has become the primary system used in the US. Smart sensors have made ILRTs more efficient by reducing both the time and the number of penetrations required to set up and conduct the tests. Not only does Graftel design and manufacture the smart sensors used in the ILRT, but they also calibrate them. After years of experience in calibrating their own instruments, Graftel established a top\u2011notch calibration laboratory that is ISO 17025 certified and now services flow, pressure, temperature, and humidity instrumentation.<\/p>\n<p>During an ILRT, Graftel engineers pressurize the reactor building to 46 PSIG for a period of 8 hours. More than 50 Graftel smart sensors mounted inside the reactor return continuous temperature and humidity data to calculate pressure decay throughout the testing period.<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_orientation=&#8221;center&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/Graftel-1201-smart-sensor.webp\" alt=\"Graftel smart sensor\" \/><\/p>\n<p>&nbsp;<\/p><figcaption>Graftel\u2019s 1201 smart sensor makes ILRTs more efficient.<\/figcaption><\/figure>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p>Following the conclusion of the primary test, the Graftel team performs a verification test. Using pressure taps in the building, the team induces a steady leak of about 50 SLPM. During this test, <a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-meter\/\">Alicat mass flow meters<\/a> monitor the actual leakage rate as the smart sensors continue to report their data.<\/p>\n<p>The two data sets are compared to verify that the smart sensors are operating within the required accuracy specifications. Graftel relies upon Alicat mass flow meters for their measurement accuracy and insensitivity to changes in pressure and temperature during the 5\u2011hour verification test.<\/p>\n<p>[\/et_pb_text][et_pb_heading title=&#8221;Local leakage rate test (LLRT) monitors&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; title_level=&#8221;h3&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p>Sometimes, the most devastating failures are caused by the smallest of components: valves, flanges, or electrical penetrations. Having secured their position in Type A testing, Graftel began to design a portable leakage rate monitor that would be suitable for Type B and C testing in nuclear facilities. Today, Graftel\u2019s <a href=\"https:\/\/www.graftel.com\/services\/ilrt-services\/\" target=\"_blank\" rel=\"noopener\">local leakage rate test (LLRT) monitor<\/a> (Model 9623) is a rugged, high\u2011precision device capable of performing B and C testing via either flow make\u2011up or pressure decay methods.<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_orientation=&#8221;center&#8221; max_width=&#8221;80%&#8221; max_width_tablet=&#8221;80%&#8221; max_width_phone=&#8221;100%&#8221; max_width_last_edited=&#8221;on|phone&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2026\/01\/graftel-leakage-rate-test-monitors.webp\" alt=\"Graftel models 9623 Model S LLRT and 9623 Model EV\" \/><\/p><figcaption>Graftel\u2019s 9623 Model S LLRT flow standard (left) is used to calibrate other leak rate monitors that cannot leave site. Graftel\u2019s current 9623 Model EV (right) with integrated air generator and internal battery operates with no power source.<\/figcaption><\/figure>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p>In a typical Type B test on a containment airlock, the airlock is sealed and pressurized to 50 PSIG. Air or nitrogen is supplied to the LLRT pressure regulator, which maintains the designated test pressure within the airlock. If the regulator allows additional flow into the airlock to maintain the test pressure, then this is evidence that leaks are present. The flow rate into the airlock reveals the degree of leakage out of the airlock. Every LLRT incorporates three Alicat mass flow meters to monitor high, medium, and low flow ranges, depending upon the needs of the particular test.<\/p>\n<p>Whereas an airlock Type B test may require a high or medium range, a Type C test on an isolation valve may require the lowest flow range. Custom flow ranges may be ordered from Graftel as individual nuclear plant needs require them. Graftel also offers an LLRT version (9623 Model S) that serves as a leakage rate monitoring standard with four Alicat mass flow meters inside.<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; max_width=&#8221;400px&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;8px||0px||false|false&#8221; custom_padding=&#8221;||2rem|2rem|false|false&#8221; custom_padding_tablet=&#8221;|||2rem|false|false&#8221; custom_padding_phone=&#8221;||2rem|0rem|false|false&#8221; custom_padding_last_edited=&#8221;on|phone&#8221; custom_css_main_element=&#8221;float: right;&#8221; custom_css_free_form=&#8221;selector figure {||  display: table;||  text-align: center;||}||||selector figcaption {||  caption-side: bottom;||  display: table-caption;||}||||selector img {||  margin-bottom: 1rem;||}&#8221; global_colors_info=&#8221;{}&#8221; custom_css_main_element_tablet=&#8221;float: right;&#8221; custom_css_main_element_phone=&#8221;float: none;&#8221; custom_css_main_element_last_edited=&#8221;on|phone&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/10\/graftel-leak-rate-monitors.webp\" width=\"2560\" height=\"1920\" alt=\"Alicat mass flow meters in Graftel LLRT standard\" class=\"wp-image-45850 aligncenter size-full\" srcset=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/10\/graftel-leak-rate-monitors.webp 2560w, https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/10\/graftel-leak-rate-monitors-1280x960.webp 1280w, https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/10\/graftel-leak-rate-monitors-980x735.webp 980w, https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/10\/graftel-leak-rate-monitors-480x360.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) and (max-width: 1280px) 1280px, (min-width: 1281px) 2560px, 100vw\" \/><\/p><figcaption>Alicat mass flow meters in Graftel LLRT standard<\/figcaption><\/figure>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||2rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p>As OEM components for the LLRT, Alicat\u2019s mass flow meters were an easy choice for Graftel. Alicat\u2019s RS\u2011232 communications protocol is standard on every mass flow meter and supports multi\u2011drop natively. This allows easy integration of three Alicats with a single user interface designed by Graftel. The LLRT touch screen and Graftel programming allows users to directly access meter functions such as tare and gas select from a central interface. Since the LLRT is intended to be a rugged, portable unit, the mass flow meters inside it must also satisfy these conditions. With no moving parts or power\u2011consuming heating elements, Alicat mass flow meters are energy\u2011efficient and insensitive to bumps, vibrations, or changes in orientation.<\/p>\n<p>Some of Graftel\u2019s earliest LLRTs have returned for maintenance still holding their original calibration accuracy after 11 years of use in the field. When radioactive contamination or other local plant conditions make annual recalibrations at the factory impossible, nuclear power plant engineers need to know they can still trust their leakage rate monitors. Together, Graftel and Alicat make that possible.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Founded in 1991 and headquartered in Roselle, Illinois, Graftel has emerged as the industry leader for nuclear facility leakage rate monitoring in the US. Regular monitoring both satisfies federal NRC regulations and serves as a preventative measure to help keep the working environment safe for power plant employees. From portable local leakage rate tests (LLRTs) [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":41244,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"1920","content-type":"","_searchwp_excluded":"","footnotes":""},"categories":[125,115,123],"tags":[],"class_list":["post-38112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-leak-testing","category-mass-flow","category-oem"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Graftel Verifies Sensor Operation in Nuclear Leak Monitoring Equipment - Alicat Scientific<\/title>\n<meta name=\"description\" content=\"Learn how Graftel verifies sensor operation in nuclear leak monitoring equipment using Alicat devices\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alicat.com\/de\/artikel\/graftel-pruft-die-funktion-von-sensoren-in-nuklearen-leckuberwachungsanlagen\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Graftel Verifies Sensor Operation in Nuclear Leak Monitoring Equipment\" \/>\n<meta property=\"og:description\" content=\"Learn how Graftel verifies sensor operation in nuclear leak monitoring equipment using Alicat devices\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.alicat.com\/de\/artikel\/graftel-pruft-die-funktion-von-sensoren-in-nuklearen-leckuberwachungsanlagen\/\" \/>\n<meta property=\"og:site_name\" content=\"Alicat Scientific\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/alicatscientific\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-02-06T23:10:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-06T23:02:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2026\/01\/graftel-leakage-rate-test-monitors.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1046\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Jarod Kober\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jarod Kober\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.alicat.com\\\/articles\\\/graftel-verifies-sensor-operation-in-nuclear-leak-monitoring-equipment\\\/\",\"url\":\"https:\\\/\\\/www.alicat.com\\\/articles\\\/graftel-verifies-sensor-operation-in-nuclear-leak-monitoring-equipment\\\/\",\"name\":\"Graftel Verifies Sensor Operation in Nuclear Leak Monitoring Equipment - 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