# NRC CAL – NOV (White)
> **EA-16-168** · CAL · Issued 2016-12-28 · Reactor Licensees
## Action
- **EA Number:** EA-16-168
- **Licensee:** NOV (White)
- **Category:** Reactor Licensees
- **Action type:** CAL
- **Date issued:** 2016-12-28
## Description

On December 28, 2016, the NRC issued a Notice of Violation associated with a White Significance Determination Process finding to Pacific Gas and Electric Company (the licensee), for a violation involving the licensee's failure to develop adequate instructions for the installation of external limit switches on safety-related motor-operated valves as required by Technical Specification 5.4.1.a "Procedures," at the Diablo Canyon Power Plant. Specifically, Procedure MP E-53.10R, "Augmented Stem Lubrication for Limitorque Operated Valves," Revision 4, used to perform maintenance on safety-related equipment, failed to provide instructions to establish and check the travel of external switches installed on motor-operated valves are within vendor established criteria. Consequently, the limit switch for valve RHR-2-8700B was installed, such that, it was operated repeatedly beyond overtravel tolerances resulting in its failure on May 16, 2016. Additionally, the licensee also violated Technical Specification 3.5.2 because train B of the emergency core cooling system was determined to be inoperable for greater than the technical specification allowed outage time of 14 days.

## Source
- [Full enforcement letter (PDF)](https://www.nrc.gov/docs/ML1636/ML16363A429.pdf)
- [NRC Reactor Licensees index](https://www.nrc.gov/reading-rm/doc-collections/enforcement/actions/reactors/)
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