|Columbia Generating Station|
|Reporting criterion:||10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications|
|3972017006R00 - NRC Website|
|Person / Time|
|From:||Hettel W G|
Document Control Desk, Office of Nuclear Reactor Regulation
|Download: ML17313A938 (4)|
comments regarding burden estimate to the Information Services Branch (T-2 F43), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
Columbia Generating Station 05000- 397 2017 - 006 - 00
At the time of the event, Columbia Generating Station (Columbia) was in Mode 1 operating at 100% reactor power.
Number 2 Diesel Generator [EK] [DG] (DG2) was out of service.
On September 21, 2017 at 0800 PDT, Columbia declared DG2 inoperable for maintenance and entered Technical Specification Action Statement (TSAS) 3.8.1, Condition B for One Required Diesel Generator inoperable. At 0821 PDT and again at 1537 PDT Surveillance Requirement (SR) 220.127.116.11 was performed to satisfy TSAS 3.8.1, Condition B action statement B.1. At 2315 PDT it was noted by operations that a page was missing from the surveillance procedure used to satisfy SR 18.104.22.168. For both occurrences the action statement was not met within the required action time. Operations entered TSAS 3.8.1, Condition F for Required Action and Associated Completion Time of Condition B not being met. AT 2321 PDT SR 22.214.171.124 was performed satisfactorily and TSAS 3.8.1 Condition F was exited.
The direct cause was due to pages sticking together when the surveillance procedure was being copied for use. The apparent cause was the failure to perform a page check of the procedure prior to use. The contributing cause was the reviewing supervisors failure to verify completeness and accuracy of the surveillance once it was completed.
EXTENT OF CONDITION
A review of recently performed on demand procedures was conducted and no instances of missing pages was noted.
COMPLETED CORRECTIVE ACTIONS
Missing pages were added, the procedure was performed, and SR 126.96.36.199 was completed satisfactorily.
Individual contributor culpability was evaluated and initiatives were developed to reinforce existing standards for performing page checks and to improve human performance.
PLANNED CORRECTIVE ACTIONS
Brief operations personnel on lessons learned from the event.
ASSESSMENT OF SAFETY CONSEQUENCES
The off site power alignment surveillance is performed to ensure the electrical system will function as designed when required. The missing page of the surveillance contains steps that must be performed to satisfy a TS surveillance requirement. Since these steps were not performed within the required time frame, the station did not meet the required action of the Limiting Condition for Operation (LCO) to perform SR 188.8.131.52. Compliance with LCOs is necessary to ensure comments regarding burden estimate to the Information Services Branch (T-2 F43), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
Columbia Generating Station 05000- 397 2017 - 006 - 00 the plant is operated above minimum requirements for ensuring safe operation of the facility. There were no actual safety consequences as a result of this event as it was administrative in nature and the required breaker alignment was verified to have been correct for the affected period.
A review of Columbia LERs for the past three years did not identify similar events where human performance issues caused the station to not meet TSASs.
ENERGY INDUSTRY IDENTIFICATION
Energy Industry Identification System (EIIS) Information codes from IEEE Standards 805-1984 and 803-1983 are represented in brackets as [XX] and [XXX] throughout the body of the narrative.