05000327/FIN-2014007-02
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Finding | |
|---|---|
| Title | Auxiliary Control Instrument Room 2A Sprinklers Not in Compliance with NFPA 13-1975 |
| Description | An NRC-identified Green non-cited violation of Sequoyah Operating License Conditions 2.C.(16) and 2.C.(13), for Units 1 and 2 respectively, was identified for the licensees failure to properly install an automatic pre-action fire sprinkler system in Auxiliary Control Instrument Room 2A (fire area FAA-090) in accordance with the approved FPP and applicable National Fire Protection Association (NFPA) Standard No. 13, Automatic Sprinkler Systems. The licensee entered this issue in the corrective action program as Problem Evaluation Report 847948. The licensees failure to install the sprinkler heads in accordance with the applicable NFPA Code of Record specified in the approved FPP for Sequoyah is a performance deficiency. This performance deficiency is more than minor because it is associated with the reactor safety mitigating systems cornerstone attribute of protection against external factors (i.e., fire) and it adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The potential delayed actuation of the sprinkler system could affect the fire protection defense in depth strategy involving suppression of fires. The finding was screened in accordance with NRC IMC 0609, Significance Determination Process, Attachment 4, Initial Characterization of Findings, which determined that an IMC 0609, Appendix F, Fire Protection Significance Determination Process, review was required as the finding involved fixed fire suppression systems. Using IMC 0609, Appendix F, Attachment 2, Degradation Rating Guidance Specific to Various Fire Protection Program Elements, a low degradation rating was assigned, based on the fact that four sprinkler heads were installed in a room of 110 ft2 and at least one head would be installed within 10 feet of combustibles of concern. Due to their spacing the sprinklers would be within the fire plume zone of influence for the combustibles of concern and the expected heat release rate (HRR) of postulated fires. Except as noted, the system was considered to be nominally code compliant, and therefore, met the low degradation criteria for water based suppression systems. Using IMC 0609, Appendix F, Attachment 1, Fire Protection Significance Determination Process Worksheet, the inspectors determined that the finding was of very low safety significance (Green), at Task 1.4.2, Question A. The cause of this finding was determined to have a cross-cutting aspect of Evaluation (P.2) in the Problem Identification and Resolution cross-cutting area, because the licensee did not thoroughly evaluate the issue to ensure that resolutions addressed extent of conditions commensurate with their safety significance. |
| Site: | Sequoyah  |
|---|---|
| Report | IR 05000327/2014007 Section 1R05 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | D Jones D Terry Ward J Dymek M Thomas S Shaeffer |
| Violation of: | License Condition - Fire Protection License Condition |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Sequoyah - IR 05000327/2014007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Sequoyah) @ 2014Q1
Self-Identified List (Sequoyah)
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