MTA-MA-014

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Administrative Items
Date	12/15/2020
Functional Area Where Benefits Will Be Realized	Maintenance Engineering
Reference Implementation Guidance	Online Monitoring Guide for Equipment Diagnostics and Reliability— Nuclear Generation (EPRI 3002010577]) EPRI Preventive Maintenance Database (PMBD) Continuous On-Line Monitoring (COLM): HVAC Air Handling Equipment, Centrifugal Fans (EPRI 3002015789]) Continuous On-Line Monitoring (COLM): HVAC Air Handling Equipment, Vane Axial Fans (EPRI 3002015790]) Continuous On-Line Monitoring (COLM): HVAC Air Handling Equipment, Propeller Fans (EPRI 3002015791])
Industry SME	EPRI – PRR Contact: NuclearPlantMod@epri.com
Previous Implementation	Please contact EPRI for implementation examples and contacts.
Implementation Enablers	MTA-MA-003 - Implement Wireless Network Infrastructure Using a Distributed Antenna System (DAS) MTA-MA-004 - Implement Wireless Network Infrastructure Using WiFi
Applicability	All reactor types All geographic regions
Keywords	Condition-based maintenance; equipment reliability; online monitoring; air handling equipment; HVAC; fans; sensors; quick guides
Business Case Analysis Cross-Reference	N/A

Description

Data acquisition and processing tools have reached the point where Continuous Online Monitoring (COLM) of equipment is possible and cost‑effective. COLM can be used to transition from time‑based preventative maintenance (PM) to condition‑based maintenance (CBM), which reduces maintenance costs by eliminating or reducing premature maintenance activities and early‑life failures of replacement parts. COLM also provides valuable insights into equipment health that may help to detect incipient failures before major equipment damage. This MTA applies to the monitoring of HVAC components and the associated time‑based task intervals that can be replaced, partially replaced, or extended with the use of condition‑based maintenance.

Air Handling Equipment (HVAC) considered in this MTA are centrifugal, vane axial, and propeller fans. These components require routine inspection and maintenance (e.g., filter cleaning) which are historically performed periodically, regardless of operating history. In addition, many of these fans are difficult to access (i.e., ceiling mounted or located in the reactor building). Implementation of HVAC equipment COLM could allow for the extension or elimination of existing maintenance activities. HVAC equipment in particular have many tasks that could be completely replaced by online monitoring, allowing a significant reduction of PMs (e.g., filter inspection and replacement, temperature monitoring, etc.).

The MTA excludes: motors, power supplies, HEPA or Charcoal Filters, Ductwork, Limitorque Type Actuators.

Benefits

Benefits Estimate

Level 1 – Savings associated with one unit implementing air handling equipment COLM are less than $1 million per year from reducing or partially eliminating PM tasks.

Benefits Description

• Reduction of almost all maintenance costs through elimination of PM tasks as a result of COLM. As an example, fan bearing temperature and vibration monitoring could be performed remotely, eliminating the PM completely. Additionally, performance monitoring and system testing can be replaced by online monitoring and alternate PM tasks.
• Improved visibility to HVAC equipment condition or associated system condition through more frequent data collection and real‑time monitoring. This could allow failure detection prior to occurrence.
• Increased safety and cost effectiveness by decreasing maintenance that requires either scaffolding or reactor building entry.
• Reduction in maintenance‑induced failures due to less frequent maintenance.
• Reduction of radiation exposure by reducing frequency of instrument calibration and PM tasks.

Costs and Schedule

Cost

Level 3 – Implementation cost is less than $1 million, including approximately 8 high‑value sensors per fan (e.g., air flow, vibration, etc.), installation, and software. This cost can be shared site or fleet‑wide if other components implement OLM.

Schedule

Six months to two years, which includes planning and implementing new sensors.

Scope Context

The scope of the cost and benefit estimates assumes 10 non‑safety‑related fans per unit. Efficiencies gained from larger deployments, such as multi‑unit sites, will increase savings.

Risks

IT risks associated with integrating the existing plant network infrastructure, data storage, and software. Addressing IT concerns at the requirements phase of the project (for example, how the sensor data will be gathered and used) will mitigate this risk.

Sensors can vary in implementation difficulty and cost.

SWEEP Score

Category	Level	Description
Cost	3	Procurement and installation of wireless sensors in combination with other software and infrastructure necessary should be limited to $1 million or less.
Savings	1	Savings are achieved through the changes in PMs are generally expected to be $1 million or less.
Payback	2	Based upon estimated cost and savings information, the payback period would be between one and five years.
Technical Readiness	3	The technology is ready for wide operational deployment. Advanced OLM programs have been implemented in fossil generation and at nuclear facilities.
Licensing Readiness	3	This technology has already been implemented at nuclear power plants and requires no licensing changes if associated changes do not affect safety‑related functions.
Implementation Proficiency	2	The implementation of this technology is site‑specific and warrants a comprehensive design change process. Implementation depends on experience related to wireless data infrastructure, data transmission for monitoring, and cyber‑security protocols, etc.