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Standard PRC-008-0 — Underfrequency Load Shedding Equipment Maintenance Programs

A. Introduction
1.

Title:
Implementation and Documentation of Underfrequency Load Shedding
Equipment Maintenance Program

2.

Number:

3.

Purpose:
Provide last resort system preservation measures by implementing an Under
Frequency Load Shedding (UFLS) program.

4.

Applicability:

PRC-008-0

4.1. Transmission Owner required by its Regional Reliability Organization to have a UFLS
program
4.2. Distribution Provider required by its Regional Reliability Organization to have a UFLS
program
5.

Effective Date: April 1, 2005

B. Requirements
R1.

The Transmission Owner and Distribution Provider with a UFLS program (as required by its
Regional Reliability Organization) shall have a UFLS equipment maintenance and testing
program in place. This UFLS equipment maintenance and testing program shall include UFLS
equipment identification, the schedule for UFLS equipment testing, and the schedule for UFLS
equipment maintenance.

R2.

The Transmission Owner and Distribution Provider with a UFLS program (as required by its
Regional Reliability Organization) shall implement its UFLS equipment maintenance and
testing program and shall provide UFLS maintenance and testing program results to its
Regional Reliability Organization and NERC on request (within 30 calendar days).

C. Measures
M1. Each Transmission Owner’s and Distribution Provider’s UFLS equipment maintenance and
testing program contains the elements specified in Reliability Standard PRC-008-0_R1.
M2. Each Transmission Owner and Distribution Provider shall have evidence that it provided the
results of its UFLS equipment maintenance and testing program’s implementation to its
Regional Reliability Organization and NERC on request (within 30 calendar days).
D. Compliance
1.

Compliance Monitoring Process
1.1. Compliance Monitoring Responsibility
Compliance Monitor: Regional Reliability Organization.
1.2. Compliance Monitoring Period and Reset Timeframe
On request (within 30 calendar days).
1.3. Data Retention
None specified.
1.4. Additional Compliance Information
None.

Adopted by NERC Board of Trustees: February 8, 2005
Effective Date: April 1, 2005

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Standard PRC-008-0 — Underfrequency Load Shedding Equipment Maintenance Programs

2.

Levels of Non-Compliance
2.1. Level 1: Documentation of the maintenance and testing program was incomplete, but
records indicate implementation was on schedule.
2.2. Level 2: Complete documentation of the maintenance and testing program was provided,
but records indicate that implementation was not on schedule.
2.3. Level 3: Documentation of the maintenance and testing program was incomplete, and
records indicate implementation was not on schedule.
2.4. Level 4: Documentation of the maintenance and testing program, or its implementation
was not provided.

E. Regional Differences
1.

None identified.

Version History
Version

Date

Action

Change Tracking

0

April 1, 2005

Effective Date

New

0

September 26, 2005

Fixed reference in M1 from PRC-0070_R1 to PRC-008-0_R1.

Errata

Adopted by NERC Board of Trustees: February 8, 2005
Effective Date: April 1, 2005

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