Nuclearn CAP Screening Video Series Index

This is a short informational blog that indexes videos explaining Nuclearn’s CAP Automation system.

Navigating to the AutoFlow Screen:

The AutoFlow screen is where the entire CAP Pipeline is configured and visually displayed. It consists of individual decision points in green blocks.

Navigating the Individual Decision Blocks:

The individual decision blocks are where the decision automations are controlled. Set thresholds and enable or disable automations at a per decision level for the overall decision block.

Navigating the Record Audit Page:

This video shows how to get from the AutoFlow to the audit page.

Explaining the Audit Table:

The record audit page contains a historical record of every issue/CR that has been processed by Nuclearn. All of the information that was available at prediction time is displayed in this table, as well as all of the decisions made by Nuclearn about this record.

Navigating the Screening Decision KPIs:

KPIs are displayed for several different metrics that Nuclearn measures from the overall system. Includes items like automation efficiency, accuracy, records processed, etc…

Quickly get to to the Audit Table:

This video simply shows how to quickly get from the homepage to the audit screen of interest.


Capitalizing on CAP Screening Automation

CAP Screening automation continues to be adopted across the Nuclear industry. As of April 2022, at least 4 nuclear utilities in North America have implemented or are currently implementing CAP Screening automation, and at least a half dozen more are strongly considering pursuing it in the near future. However, not everyone in the nuclear industry is intimately familiar with the concept, or may only have a partial picture of the scope of CAP Screening Automation. In this post, we will quickly cover the basics of CAP Screening, automation, and the value it can deliver for utilities operating Nuclear Power Plants.

Corrective Action Programs and Nuclear Power Plants

For those unfamiliar with nuclear power operations, every Nuclear Power Plant operating within the US is required by law to run a Corrective Action Program (CAP). In the Nuclear Regulatory Commissions own words, CAP is:

The system by which a utility finds and fixes problems at the nuclear plant. It includes a process for evaluating the safety significance of the problems, setting priorities in correcting the problems, and tracking them until they have been corrected.

CAP is an integral part of operating a nuclear power plant, and touches almost every person and process inside the organization. It also happens to be a manually intensive process, and costs each utility millions of dollars in labor costs each year to run.

CAP Screening

Screening incoming issue reports is the biggest process component of running a CAP, and is how utilities “…[evaluate] the safety significant of the problems [and set] priorities in correcting the problems…”. The screening process often starts immediately after a Condition Report is initiated, when a frontline leader reviews the report, verifies all appropriate information is captured, and sometimes escalates the issue to operations or maintenance. Next, the Condition Report is sent to either a centralized “screening committee”, or to distributed CAP coordinators. These groups review each and every Condition Report to evaluate safety significance, assess priority, and assign tasks. Somewhere between 5,000 and 10,000 Condition Reports per reactor are generated and go through this process each year.

Example CAP Screening process with a centralized screening committee.

In addition to the core screening, most utilities also screen Condition Reports for regulatory impacts, reportability, maintenance rule functional failure applicability, trend codes, and other impacts. These are important parts of the CAP Screening process, even if they are sometimes left out of conversations about CAP Screening automation.

Automating CAP Screening with AI

Every step in CAP Screening listed above is a manual process. The leader review, screening, and impact assessments are all performed by people. Each of the listed steps has a well defined input, well defined outputs, and has been performed more or less the same way for years. This consistency and wealth of historical data makes CAP Screening ripe for automation using artificial intelligence.

Introducing AI-driven automation into the CAP Screening process allows many of the Condition Reports to bypass the manual steps in the process. Before being screened, Condition Reports are instead sent through an AI agent trained on years of historical data that will predict the safety impacts, priorities, etc. and produce the confidence in it’s predictions. Based on system configuration, Condition Reports with the highest confidence will bypass the manual screening process altogether.

An example CAP Screening workflow with the introduction of AI-driven automation.

In the best implementations, CAP Screening automation will also include sending a small portion of “automatable” condition reports through the manual screening process. This “human in the loop” approach facilitates continuous quality control of the AI by comparing results from the manual process to what the AI would have done. When combined with detailed audit records, the CAP Screening automation system can produce audit reports and metrics that helps the organization ensure the quality of their CAP Screening.

Results will vary by utility, but a site adopting CAP Screening automation can expect to automate screening on anywhere between 10% to 70% of their Condition Reports. The proportion of Condition Reports automated is a function of the accuracy of the AI models, the consistency of the historical screening process, and the “risk of inaccuracy” the utility is willing to take. We expect this proportion to continue to increase in the future as AI models improve and CAP programs are adjusted to include automation.

Why are Utilities Interested in CAP Screening Automation?

Correctly implemented, CAP Screening automation is a very high value proposition for a utility. CAP Screening personnel are often highly experienced, highly paid, and in short supply. Reducing the number of Condition Reports that have to be manually screened reduces the number of personnel that have to be dedicated to CAP Screening. Automation also improves the consistency of screening and assignment, reducing rework and reassignments. Automation also eliminates the screening lead time for many Condition Reports, allowing utilities to act more quickly on the issues identified in CAP.

Various Nuclear Power Plants in North America are automating portions of the CAP Screening processes using artificial intelligence and realizing the value today. Automated screening is one of the reasons why we believe AI is the promising future of Nuclear CAP. The efficiency savings, improved consistency, reduce CAP-maintain-operate cycle times, and other benefits from CAP Screening automation are too valuable to ignore, and we expect most nuclear utilities to Capitalize on CAP Screening automation over the next several years.

Interested in automating the CAP Screening Processes at your plant? Nuclearn offers a commercial CAP Screening Automation software solution leveraging state of the art AI models tailored to nuclear power. Learn more by setting up a call or emailing us at

5 Reasons AI is the Promising Future of Nuclear CAP

In the near future, the Nuclear Corrective Action Program (CAP) will be sleek, streamlined, and highly efficient; where occasionally humans participants are required to review and deliberate over only the most complicated issues requiring their vast experience and wisdom. For everything else, a trained army of CAP AI agents invisibly process issues, review and alert on trends, assign corrective actions, and take feedback from human coaches via purpose-designed human/AI interfaces.

No longer will a team of humans be subject to hours upon days of analysis for trend detection, a Senior Reactor Operator forced to process another condition report about a cracked sidewalk, or an Engineer left waiting for a corrective action item to be issued to her inbox. These functions will have been largely automated with the focused application of AI-based technology. Here are the five reasons this future is highly probable, based on both the current state of the Nuclear Industry and leading-edge AI technology.

Cost Savings and Improved Quality

It comes as no surprise to anyone that has worked in the Nuclear Industry that running an effective CAP program is expensive. CAP demands a significant investment into human resources that have adequate experience to effectively diagnose and resolve the problems experienced in an operating power plant. In practice, this requires either dedicated staffing or rotating employees out of primary roles to fulfill a CAP function.

By applying intelligent automation to the Screening, Work Generation, and Issue Trending processes, a resource reduction of approximately 45% is expected.

Beyond reducing the number of resources required, AI reduces the total amount of time required to execute portions of the CAP process. While a human screening team may only be able to process conditions on a daily basis, an AI system can review and screen conditions and issue work items immediately. More quickly getting workable tasks into the hands of employees saves money and improves CAP quality.

For those issues that may be too complex for AI to effectively handle, a human-in-the-loop system can be employed, where AI knows when it is unsure and can reach out for human assistance. By using human-in-the-loop the cost of the CAP program is reduced while keeping quality the same or better.

Additionally, AI can lower the threshold for issue documentation. Deployment of an information extraction AI lets employees more naturally capture issues using natural language, without filling out specialized forms. When issues become easier to document, they are documented more often, the overall information input into the CAP program increases, and the chance an issue is corrected becomes greater. AI that immediately evaluates the quality and completeness of the submitted report enables automated dialogue with the submitter. This can encourage behaviors such as adding information, clarify issues, correcting spelling, or otherwise encourage behaviors that promote report quality, increasing the effectiveness of the overall CAP program.


The most valuable problems to solve are frequently the largest. CAP and associated activities are one of the largest opportunities in Nuclear. CAP lies at the heart of the Nuclear Industry, and requires participation from almost every trade and profession at each site. The ubiquity of CAP combined with the savings potential provides an immense incentive for plant operators, industry vendors, and industry research groups to discover and implement ways to make these programs run more sustainably and efficiently. Specialized AI that can automate various tasks are at the top of mind of industry groups such as the Electric Power Research Institute, the Idaho National Laboratories, and various utility in-house teams.

A fortunate side effect of the CAP program is the production of large quantities of high-quality data – data ideal for training the AI systems that will be used to automate the same functions. Most of this data is captured in free-form text as natural language. Language with a specific Nuclear vocabulary and dialect, but natural language nonetheless. The scale of this data puts it on par with the datasets utilized by the large technology vendors and academic institutions to develop and train the most effective AI systems. Thanks to the scale of Nuclear CAP data, these large AI systems can be specialized to operate in the Nuclear domain – increasing performance and effectiveness for the tasks at hand.


The most notable advancements in AI technology of the late 2010s were around the development of advanced natural language-based AI. This AI has the ability to understand human language more naturally and effectively than previously thought possible. Breakthroughs in this area are characterized by the ability of AI to transfer learning from one problem to another. An AI good at classifying condition report quality will be better at identifying equipment tags vs one specifically trained just to identify equipment tags.

The benefit for the nuclear industry is that an AI system trained at Plant X will be able to transfer its learning to Plant Y and be more performant than one trained at just Plant Y. This is similar to how a working professional at Diablo Canyon would more easily adapt and apply their knowledge when transferring to Turkey Point than someone not having worked in the nuclear industry at all. Similar to a human employee, an AI system will benefit from the variety of different knowledge obtained from general industry data. Learning specifics for any one plant will be faster, cheaper, and easier for any plant wishing to specialize the AI system for use in automation once trained on general industry data.

As a result, solutions developed at one site will be able to be shared. With commonly applicable training and similar problems, the industry can work to solve the big problems once with ‘large’ or ‘hard’ AI, and transport the solution from plant to plant for the benefit of the entire industry.

Automated Screening

One of the more specific solutions apparent when applying AI to the CAP process is the automation of the condition screening process. Condition screening is the process of reviewing a received report of a non-standard condition in or around the plant, then applying certain tags, codes, or classifications, assigning an owner, and generating the appropriate work items that address the condition. For some plants, this process involves dedicated groups of senior employees that work daily to manually perform this process. For others, this involves dispersed resources periodically gathering together to complete screening. In either case, the resources are usually senior-level and experienced, and thus expensive. The following estimation of resources spent by the industry for this process each year illustrates just how large an opportunity there is:

The screening process has certain properties: repeatability and complexity of task, quality of data, scale, cost, etc. that make it extremely promising to apply AI-powered automation — discussion worthy of a separate blog post…coming soon!

Automated Trending

Automated trending is the sequel to Automated Screening – it’s what comes after the conditions have been identified and actions issued. Normally done ‘cognitively’ or via brute force search of the condition data, trending is resource-intensive and largely manual. Read Nuclearn’s Nuclear CAP Coding AI – Better Performance at a Lower Cost to find out more about how AI can help automate and simplify the trending task.

Bonus: The Rapid Progress of AI Technology

The five points above are only achievable due to the explosion in the progress of various technologies that underpin how AI learns and behaves. The speed in recent years with which new AI tools achieve human-level performance on various vision and language tasks is unprecedented. As seen in the chart below, developing AI that can recognize simple numerical digits at human-level performance took over 10 years; to recognize cats, dogs, cars and other everyday objects in images took about 5 years. More recently, developing AI that can recognize and manipulate human language took only about 2 years.

The accelerating pace of AI advancements shows no sign of stopping anytime soon. This type of rapid advancement, combined with the scale, transportability, and savings of CAP, allows Nuclearn to confidently say AI is the future of Nuclear CAP.


Nuclear CAP Coding AI – Better Performance at a Lower Cost

Over the last few years there has been a lot of discussion in the domestic Nuclear industry about using Artificial Intelligence to automate Nuclear Corrective Action Program (CAP) coding. The general idea is that sites can apply Artificial Intelligence algorithms to process large amounts of historical CAP data, those algorithms learn how Condition Reports and trend codes relate, new data is fed through those algorithms, and codes are automatically applied. While this is an exciting development in an industry with a long history of manual administrative processes, only a few sites have actually been able to adopt automated coding. To learn how sites can better adopt AI to automate Nuclear CAP coding, we will cover the economic pressures facing Nuclear Power, discuss the important role of coding in CAP, and present new tools for enabling AI-driven automation of Condition Report coding.

Cost Savings in Nuclear CAP

There is a simple, unavoidable fact looming over the Nuclear Power industry in the United States.  The cost per kilowatt-hour of Nuclear power has been increasing year over year for a decade, while existing Natural Gas and new Solar Generation costs are decreasing.  Simply put, Nuclear Power Plants need to become cheaper to operate in the very near future if they want to remain economically viable.

Data derived from Lazard Levelized Cost of Energy Analysis 2012-2020

This isn’t a secret to anyone who has worked in Nuclear Power over the last few years.  In fact, the entire industry mobilized to combat rising costs in a combined effort under the “Delivering the Nuclear Promise” initiative.  While this initiative helped slow down cost increases in the industry, it has still not been enough.  Costs for competing generation sources are closing in, and sites have to do more if they want to remain relevant.

One opportunity for savings comes from the “Corrective Action Program” (CAP) each site has.  Nuclear Corrective Action Programs are a key part of ensuring the safe continuing operation of a plant, are required by law, and are tremendously expensive to run and administer.  There are plenty of opportunities for cost savings in CAP, but in this article we will address one: using Artificial Intelligence to automate the trend coding of Condition Reports.  

But before we can get into the solution, let’s first cover the economics & challenges of today’s prevalent manual approach to Condition Report coding.

Trending Isn’t Easy…

The average Nuclear reactor will log between five and ten thousand Condition Reports in their CAP program each year.  It is not uncommon for multi-unit sites or fleets to have hundreds of thousands, even millions, of Condition Reports in in their historical datasets.

The Nuclear Regulatory Commission (NRC) & the Institute of Nuclear Power Operations (INPO) expect healthy CAP programs to include the analysis and trending of aggregate data.  This is a daunting task for many plants, exacerbated by an inherent attribute of CAP data.  Data collected in a Condition Report usually only includes the following information:

  • Title
  • Description of the issue
  • Affected equipment/procedures
  • Actions taken

3 of the 4 key data elements of a Condition Report are text.  Nuclear-specific, convoluted, jargon-heavy text.  And anyone that has done data analysis on text-heavy data sets can tell you that aggregate analysis and trending of text data is almost impossible using traditional analytical techniques.

“During performance of IST AF43-9PT4F, AFP A tripped on an overspeed signal.  This resulted in an unplanned entry into LCO 1.54, and mandatory entry into Mode 2 within 2 hours.  SRO cleared the alarm, and AFP A was declared OPERATIONAL after performing re-test.”

Share a few thousand of these with an analyst from a different industry and see how well they can trend (they won’t get very far)

Domestic Nuclear sites have recognized this challenge, and combat it by having professionals with extensive Nuclear experience bucket their Condition Reports by tagging them with one or more “codes”.  By tagging Condition Reports with one or more of these codes, plants find it much easier to trend and analyze their issues, understand which performance areas they may be doing poorly in, and benchmark themselves against the rest of the industry.  Many sites have developed their own coding schemes, but recently many sites have begun tagging their issues with one or more of the INPO Performance Objectives & Criteria (PO&C).  The INPO PO&Cs are site-agnositc list of nearly 1,000 performance criteria that plants must meet to be considered high-performing.  

Trending Isn’t Cheap…

While this process of “coding” issues is an important part of a healthy CAP program, it comes with a significant cost and several drawbacks.  The “coding” process is very time consuming and requires someone with an extensive background in many different areas of Nuclear Power, as well as an intricate knowledge of their coding scheme.  Our experience with “coding” processes is that they take three to five minutes per Condition Report.  When we combine this with the typical inflow of issues at a domestic Nuclear reactor, and consider a reasonable loaded hourly rate for a nuclear professional…

… we reach the staggering number of $40,000 per year per reactor spent just coding Condition Reports.  If we take into account that this role will typically require at least one dedicated individual at a multi-unit site, and that that individual will need to spend a significant amount of time in training, PTO, and activities required of a nuclear professional, we can reach an even higher number.

In addition to costs, there are other challenges with manual coding practices.  There are significant differences in the “styles” used by different individuals when coding, which can result in unpredictable labeling practices.  When the people performing the coding change, or when additional individuals help with coding during an outage, it is common to see drastic changes in how issues are coded and what codes are used.  This can result in “trends” and “spikes” in the data that have nothing to do with underlying plant issues, but are instead the byproduct of a manual coding process.  Additionally, it is not uncommon for coding schemes to change.  The INPO PO&C codes for example have received several revisions over the years. When faced with a revision, plants are faced with either losing their historical data, paying tens of thousands of dollars to “re-code” historical data, or use inexact “translating” processes to transform their historical data into the new schemes.  None of these options are particularly appealing.

Artificial Intelligence Can Help

What if plants could get the majority of the benefit of coding, eliminate some of the drawbacks, and save costs while doing so?  Recent advances in Artificial Intelligence techniques for text and “natural language processing” can allow them to do just that.  Using a subset of AI called “Machine Learning”, it is now possible for a computer algorithm to process historical CAP data to learn the correlations between Condition Reports and the codes that have been assigned to them.  After training is complete, new Condition Reports can be fed through the model and codes can be applied automatically using the learned historical patterns.

This chart shows how an AI agent “Aristo” scored on the New York Regents eighth-grade science test over time.

This approach has numerous advantages over manual coding.  A machine learning algorithm will always code the same Condition Report the same way, removing the inherent variability in manual coding.  Additionally, a machine learning algorithm can code 24×7, allowing sites to do real-time trending around the clock (or just not have to wait until a “coder” is back in the office from PTO).  When new coding schemes come out, sitescan train a model on a relatively small number of new examples and apply it to historical data – allowing them to retain historical trends by re-coding data efficiently.  

So why haven’t plants adopted AI-drive automated coding en masse?  Well, Machine Learning isn’t easy, and it especially isn’t easy to do on text-heavy datasets with complex domain-specific vocabularies (looking at you Nuclear).  Sites that have looked to traditional Nuclear software vendors have found that they lack the technical capabilities to build and train Machine Learning models to a reasonable accuracy level.  Others that have looked to larger tech firms have found price tags well into the hundreds of thousands of dollars, with no guarantee that the provided solutions will actually work.

To have any chance of adopting AI-driven automation of Condition Reports, sites need an affordable solution built by people that know State of the Art Artificial Intelligence techniques and know Nuclear. to the Rescue

We at Nuclearn have built just that: an affordable Machine Learning algorithm that applies PO&C codes to Condition Reports.  As part of our free “Cloud Basic” subscription, anyone can start automatically coding their Condition Reports.  The process to get started is exceedingly simple – register an account and download the “Condition Report Trending Dashboard” excel sheet from the CAP AI module, and follow the instructions to input your Condition Report texts!  The pre-built excel sheet will send Condition Reports through our PO&C algorithm, predict the PO&C codes, and automatically trend them in just a few minutes.

*Note: As of v1.4, the CAP Report Trending Dashboard is deprecated in favor of our new analytics module. Learn more by watching this video:

Now what about cost?  As discussed earlier, any AI-driven solution needs to be competitive with the $40k a year per unit price tag for manual coding.  Nuclearn’s free Cloud Basic subscription offers 1,000 predictions free per month at no cost.  For most Nuclear sites in the U.S., that means that adopting Artificial Intelligence based coding can be done for free, right now.

Nuclear CAP Coding AI Dashboard
Example of the visualizations included in the “Condition Report Trending Dashboard”

Some sites may find that Nuclearn’s PO&C algorithm performs well, but that they either have unique Condition Reports unlike the rest of the industry, or desire a different coding scheme from the standard PO&Cs.  In that case, sites can contact us directly, and we can discuss our on-premise platform that can train directly on your data and meet your needs.  And we can guarantee for PO&C coding, Nuclearn’s solution will be substantially cheaper than $40k per reactor per year.

Nuclearn is here to help Nuclear Power Plants adopt AI-driven automation of Condition Report coding, and save money in the process. Sites need to automate key processes, such as Condition Report trending, if they want to remain economically viable. Read Introducing Nuclearn to learn about why we started Nuclearn, and visit to learn about other processes that Nuclearn can help automate.