Browse wiki

The inspectors identified a non-cited viol … The inspectors identified a non-cited violation of 10 CFR 50 Appendix B, Criterion V, Instructions, Procedures, and Drawings, associated with inadequate instructions for tuning the reactor core isolation cooling (RCIC) terry turbine speed governor. The licensees immediate corrective actions included revising the maintenance procedure and recalibrating the RCIC turbine speed - 4 - Enclosure controller. The station documented the finding in Condition Reports CR-RBS- 2012-01750 and CR-RBS-2012-01904. This performance deficiency is more-than-minor and is therefore finding because it is associated with the equipment performance attribute of the Mitigating Systems cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, during operation, this performance deficiency resulted in improper tuning of the turbine speed control system, which caused the turbine exhaust check valve to repeatedly slam against its open and shut valve stops and abnormally large turbine governor valve oscillations. Because the licensee had not tuned the turbine speed control system to run at a steady speed, the licensee removed RCIC from service to properly calibrate the control system, thereby adversely affecting RCIC availability. Using NRC Inspection Manual Chapter 0609, Attachment 4, Initial Characterization of Findings, the inspectors determined that the issue affected the Mitigating Systems Cornerstone. Using NRC Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings at Power, the inspectors determined that the issue had very low safety significance (Green) because the finding was not a deficiency affecting the design or qualification; did not represent a loss of system and/or function, did not represent either an actual loss of function of at least a single train for greater than its Technical Specification Allowed Outage Time, or two separate safety systems out-of-service for greater than its Technical Specification Allowed Outage Time; and did not represent an actual loss of function of one or more non-Technical Specification trains of equipment designated as high safety-significant in accordance with the licensees maintenance rule program for greater than 24 hours. The inspectors determined the apparent cause of this finding was the licensees failure to incorporate industry and vendor operating experience into the work instructions on February 12, 2011, to correct RCIC governor valve oscillations. Therefore, this finding has a cross-cutting aspect in the area of problem identification and resolution associated with the operating experience component because the licensee did not implement and institutionalize industry knowledge, including vendor recommendations, to support plant safety. recommendations, to support plant safety.

Discovered date

23:59:59, 30 September 2012 +

Docket

05000458 +

Event date

23:59:59, 30 September 2012 +

Finding integer

3 +

Finding type

Non-cited violation +

Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.

Hours

2.777778e-4 d (0.00667 hours, 3.968254e-5 weeks, 9.132e-6 months) +

INPO aspect

CL.1 +

Identified by

NRC identified +

Inspection Manual Chapter

NRC Inspection Manual 0609 + and NRC Inspection Manual 0609/Appendix A, The Significance Determination Process (SDP) for Findings At-Power +

Inspection procedure

IP 71111.15, Operability Determinations and Functionality Assessments +

Inspection report

IR 05000458/2012004 +

Inspector

J Laughlin +, G Guerra +, R Hagar +, G Apger +, B Rice +, G Larkin +, Paul Elkmann +, Chris Steely +, Wayne Sifre +, Matt Young +, Antonio Barrett + and David Strickland +

Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.

00:46:12, 21 February 2018 +

Person