05000483/FIN-2012002-02
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Technical Specification 3.7.4, Atmospheric Steam Dump Valves (ASDs), requires that four atmospheric steam dump lines shall be operable at all times in Modes 1, 2 and 3. Contrary to the above, on October 27, 2011, Callaway operators determined that valve ABV0040 (manual isolation valve for steam generator train B) had been inoperable for an indeterminate amount of time resulting in the atmospheric steam dump line, train B, being inoperable. Specifically, it took three operators more than 20 minutes to close the valve, which is more than the time required in licensing basis documents. The causes were determined to be poor preventative maintenance and inservice testing practices. The details of this issue are documented in License Event Report 05000483/2011-005-00. This finding is more than minor because it was associated with the equipment performance attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective to provide reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. Using Manual Chapter 0609.04, Phase 1 - Initial Screening and Characterization of Findings, this finding required a Phase 3 significance determination to evaluate the risk of operators failing to isolate a steam generator during a tube rupture event. A Region IV senior reactor analyst verified that the finding was of very low safety significance. The delta-CDF was determined to be much less than 1E-6. The delta-LERF was determined to be much less than 1E-7. This finding was entered in the licensees corrective action program as Callaway Action Request 201108992. |
| Site: | Callaway  |
|---|---|
| Report | IR 05000483/2012002 Section 4OA7 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | D Dumbacher N O 'Keefe Z Hollcraf |
| INPO aspect | |
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Finding - Callaway - IR 05000483/2012002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2012Q1
Self-Identified List (Callaway)
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