05000395/FIN-2011005-02
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Finding | |
|---|---|
| Title | Lightning Induced Trips of Safety-Related Chillers |
| Description | A URI was identified by the inspectors for safety-related chiller trips due to lightning. On October 13, 2011, following a lightning strike at the station the A train safety-related chiller tripped on overcurrent when the 250 amp limit for circuit 1 of the two circuit chiller was exceeded. The B train of chilled water system was also inoperable which required the licensee to enter TS 3.0.3. The B train chiller was returned to an operable status to allow exiting TS 3.0.3. The licensee entered the problem into their CAP as CR-11-05225 and performed an operability evaluation. The evaluation also referenced CR-11-03187 that documented a similar, previous trip of the C chiller while aligned to A train power on June 5, 2011, during a lightning storm. The inspectors continue to evaluate the regulatory aspects of these events. This issue is identified as URI 05000395/2011005-02, Lightning Induced Trips of Safety-Related Chillers. |
| Site: | Summer  |
|---|---|
| Report | IR 05000395/2011005 Section 4OA2 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Alen E Coffman G Mccoy J Reece M Thomas P Higginsj Reecem Speck E Lea G Mccoy E Coffman |
| INPO aspect | |
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Finding - Summer - IR 05000395/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Summer) @ 2011Q4
Self-Identified List (Summer)
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