Browse wiki

A self-revealing Green NCV of TS 5.4.1a, P … A self-revealing Green NCV of TS 5.4.1a, Procedures, was identified for the failure of the licensee to have an adequate procedure for preventative maintenance on the 1B residual heat removal (RHR) room cooler damper limit switch. Specifically, between May 1990 and September 26, 2013, the licensee did not have an adequate preventative maintenance procedure to replace the 1B RHR room cooler damper limit switch and to tighten the paddle arm on the limit switch. This resulted in the failure of the 1B RHR room cooler to start and the inoperability of the 1B RHR train. The licensee replaced the limit switch on the damper, tightened the paddle arm on the limit switch, returned the room cooler to operable, and entered this issue into the CAP as NCR 607986. The inspectors determined that the failure of the licensee to have an adequate procedure to replace the 1B RHR room cooler limit switch and tighten the limit switch paddle arm was a performance deficiency. The finding was more than minor because it was associated with the equipment performance attribute of the Mitigating Systems Cornerstone and adversely affects the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to replace the limit switch and tighten the limit switch paddle arm resulted in a failure of the cooler fan and damper, and the inoperability of the 1B RHR train. Using IMC 0609, Appendix A, issued June 19, 2012, the SDP for Findings At-Power, the inspectors determined the finding was of very low safety significance (Green) because the finding did not affect the design or qualification of a mitigating SSC, the finding did not represent a loss of system and/or function, the finding did not represent an actual loss of a function of a single train for greater than the TS allowed outage time, the finding did not represent an actual loss of a function of one or more non-TS trains of equipment, and did not screen as potentially risk-significant due to a seismic, flooding, or severe weather initiating event. The finding does not have a cross-cutting aspect since the performance deficiency is not indicative of current plant performance. Vendor Manual QTR155, NAMCO Controls, which required periodic replacement of the limit switch and checking the limit switch for tightness, was provided to the licensee in May 1990. was provided to the licensee in May 1990.

Discovered date

23:59:59, 31 December 2013 +

Docket

05000325 +

Event date

23:59:59, 31 December 2013 +

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>.

Identified by

Self-revealing +

Inspection Manual Chapter

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

Inspection procedure

IP 71111.19 +

Inspection report

IR 05000324/2013005 +

Inspector

J Laughlin +, M Bates +, G Hopper +, P Lessard +, Mark Schwieg +, Michelle Catts +, Jim Dodson +, Joseph Austin + and Diane Jackson +

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>.

03:48:14, 28 September 2017 +

Person