vST524 – Nuclear Steam Turbine Steam Path Maintenance

vST524 – Nuclear Steam Turbine Steam Path Maintenance

5 days (4-hours sessions) - 20 PDH Credits Awarded


No future dates scheduled


Planning, scheduling, and implementing a steam turbine outage can be one of the most demanding tasks you perform.  Especially, when problems are found that were not anticipated (and there are always these kinds of problems).  In the class we will learn to better plan the work (from a technical perspective).  Once the work is planned, as we know, the next task is to work the plan.  Here is where the surprises can occur.  Some components will not disassemble according to procedure – what are your options?  Some components do not meet OEM specifications – what are your options?  Some components don’t go back together according to procedure – again, what are your options?  These options usually involve repair / replace / reuse decision making.  Effective decision making is a function of your knowledge of the importance of this component, your understanding of recommended tolerances, your understanding of how different options can impact the schedule and/or cost of this outage.  Complicating this issue is a strong need to make outages shorter in length, AND longer in frequencies between outage.  It’s simple:  You need to do more with less time and money available.  This course is intended to help you (or your staff) make better steam turbine maintenance decisions.

Over the past couple years the most commonly received comment for our traditional steam turbine maintenance training was, "I wish I had taken this course 10-years ago."  Well, we’re planning on the same comments for the VILT (virtual instructor led training) sessions.  The phrase high-quality applies to ‘content’ and the ‘presentation’ skills.  We see the following advantages in the delivery of our virtual instructor led training session:

  • Greater schedule flexibility since we don’t have to deal with travel schedules.
  • Lesser cost as there is the travel & living expenses is now zero.
  • Lesser time consumption as travel time to / from the site or classroom is eliminated.
  • Maintain the same level of content (sometimes even improve that content) by greater attention given to the need for a quality presentation.
  • Improved even more easy to read text content.

All of the above advantages along with HPC’s history of providing knowledgeable / equipment experienced instructors


Upon completion of the course the participants should be able to:

  1. Identify safety precautions that must be adhered to during a turbine steam inspection and repair outage.
  2. Describe the various non-destructive examinations performed during disassembly of the steam turbine.
  3. Describe the procedures for cleaning and inspecting the steam turbine steam components.
  4. Describe the impact of the various types of defects on turbine efficiency, reliability and future operations.
  5. Describe the type and purpose of clearance and alignment measurements commonly taken during the disassembly and reassembly procedures.
  6. Describe the criteria used to evaluate steam turbine defects
  7. Describe the criteria used to evaluate turbine steam component defects.
  8. Describe the various repair methods for defective steam turbine component conditions. Describe the common repair methods for repair of steam turbine components.
  9. Describe the purpose of conducting a steam path audit, and how that audit would be accomplished.
  10. Describe the common types and operation of journal and thrust bearings.
  11. Describe the common causes of bearing damage
  12. Describe common bearing inspection and repair procedures.
  13. Describe the methods used to properly align steam turbine generator components.
  14. Demonstrate the ability to perform the necessary calculations to align steam turbine components.

Course Synopsis

Day 1

Turbine Shells, Casings & Rotors:   This lecture is intended to prepare the participant to safely and efficiently disassemble/reassemble major turbine components, as well as to improve inspection/repair techniques, communications on equipment, and make better replace/repair/reuse decisions, decisions.

Day 2

Turbine Shells, Casings & Rotors continues: Presentations include specific discussions on the different types of distress typically found on these components.

Journal & Thrust Bearings:   Learn the different types of bearings and their applications, disassembly/reassembly procedures, inspection techniques, and typical types of distress as well as causes.

Day 3

Bearing inspection and repair methods continued

Couplings:  Learn what types of couplings are used on T-G sets, how torque is transferred, how to properly disassemble/reassemble, how to inspect, what measurements to take, and what they mean.

Day 4

Alignment: Learn how to properly take clearance/alignment and how to evaluate. Discussions include how to calculate and make moves for stationary equipment such as diaphragms and inner shells. Discussions also include how to take coupling rim/face readings, how to calculate moves to correct for coupling misalignment, and how to calculate and make moves to bearings to accomplish alignment objectives.

Day 5

Alignment Continues:

Job Wrap-Up:   Learn what kind of data should be recorded following the outage, and what checks to make as we prepare to return the equipment to service.

Course dates / fee

This course is scheduled to be delivered in five one-half days.  See www.TurbineGeneratorTraining.com for latest information on the course

dates.  Please note that, due to time restrictions, we will be assuming the attendee has fundamental knowledge of steam turbine construction (see our vST201).  Also, due to time restrictions, the steam turbine valves will be covered in a separate virtual course.

HPC Technical Services reserves the right to cancel any course/seminar within 10-working days of the scheduled date.  Fees are 100% refunded or credited to another Seminar (clients' choice) if HPC should cancel any Seminar.

Frequently asked questions

  • Will HPC Technical Services bring this course to our location (or provide a VILT) for our personnel only? YES, call or email Stephen Parker, Stephen@TurbineGeneratorTraining.com for a price quotation.
  • Will HPC Technical Services customize the presentation to suit our particular needs?
  • Can HPC Technical Services provide "Technical Assistance" in the planning and implementation of our outages? Yes we can.  Call or contact Stephen Parker, Stephen@TurbineGeneratorTraining.com for our rate sheets and any further information required.

What you will receive:

  1. 1 copy of HPC Technical Services' full COLOR textbook, Nuclear Steam Turbine Steam Path Maintenance, as written by Harold Parker, with significant technical support by Ray Militello, Robert Doughty, Doug Lemmo, Bill Newbury and John Mitchell. The textbook will be sent to the registered personnel approximately 2-weeks prior to course date.  Recognize that registration needs to be more than 2-weeks prior to scheduled course date to ensure the text will arrive prior to course date.
  2. A "Certificate of Completion" with 17.5 PDH.