05000321/FIN-2011002-04
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | A licensee-identified violation of Technical Specification 3.7.4 and 3.7.5 was discovered on August 3, 2010, when it was determined that the main control room air conditioner chiller 1Z41-B008B would fail to start from a standby condition rendering the chiller inoperable. The cause of violation was less than adequate design, because the chiller could not dissipate the unusually high ambient heat load due to the heat up of stagnant plant service water while a chiller is in standby. The significance of this violation was screened using the Phase 1 of the SDP in accordance with NRC IMC 0609 Attachment 4, Table 4a. This violation screened as Green because each question under the Mitigating Systems Cornerstone column of Table 4a was answered no. Unit 1 and Unit 2 Technical Specifications 3.7.4 and 3.7.5 require three control room air conditioning and two environmental control subsystems shall be operable during Modes 1, 2 and 3, during movement of irradiated fuel assemblies in the secondary containment, during core alterations, and during operations with a potential for draining the reactor vessel. Contrary to this requirement it was determined that the main control room air conditioner chillers could not automatically start up from standby conditions and thus three main control room air conditioning chillers were not operable for periods of time during high ambient heat conditions while Unit 1 and Unit 2 were in Mode 1. This violation is documented in the licensees corrective action program as CR 2010109805 and was reported to the NRC as LER 05000321/2010-005. |
| Site: | Hatch  |
|---|---|
| Report | IR 05000321/2011002 Section 4OA7 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | S Shaeffer D Jones E Morris D Hardage |
| INPO aspect | |
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Finding - Hatch - IR 05000321/2011002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Hatch) @ 2011Q1
Self-Identified List (Hatch)
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