05000282/FIN-2012002-02
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Finding | |
|---|---|
| Title | Review Of Steam Exclusion Damper Maintenance Effectiveness |
| Description | On March 21, 2012, the licensee performed surveillance testing on the SE system as directed by Surveillance Procedure (SP) 1112, Steam Exclusion Damper Monthly Test. The purpose of the test was to ensure that SE dampers used to protect certain areas of the plant from a high energy line break (HELB) event closed as required. During the test, the licensee identified that control dampers CD-34187 and CD-34188 failed to fully close. Specifically, both dampers contained several gaps between the damper blades. Operations personnel immediately declared the dampers non-functional and entered Technical Requirements Manual Limiting Condition for Operation (TLCO) 3.7.1. Operations personnel closed both of the SE dampers to comply with the TLCO. Both dampers remained OOS at the conclusion of the inspection period. Over the last several months, the inspectors have reviewed multiple CAP documents regarding the failure of one or both of the control dampers. As a result, the inspectors were concerned that maintenance personnel may not be implementing appropriate work practices during the damper repairs and/or the licensee may not be properly identifying and addressing the potential for common cause damper failures. The inspectors reviewed the surveillance test history for control dampers CD-34187 and CD-34188 since September 2011. The inspectors determined that damper CD-34187 had failed its surveillance test two out of the last six times while CD-34188 had failed four of the last six tests. The licensee initiated CAPs 1326072 and 1330276 to document the issues with the SE dampers. The licensee was evaluating the potential maintenance issues at the conclusion of the inspection period. As a result, determinations regarding maintenance effectiveness and the potential for common cause failure will be considered unresolved pending a review of the licensees causal evaluation |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2012002 Section 1R12 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | C Moore C Thomas D Passehl D Szwarc J Beavers J Jandovitz K Riemer K Stoedter M Phalen P Zurawski R Langstaff V Myers A Dunlop A Shaikhk Riemerd Szwarc B Palagi M Phalen R Baker K Stoedter M Speck K Barclay P Laflamme E Sanchez-Santiago J Beavers M Ziolkowski T Daun |
| INPO aspect | |
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Finding - Prairie Island - IR 05000282/2012002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2012Q1
Self-Identified List (Prairie Island)
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