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At 1500 hours on October 14, 2009, the pow … At 1500 hours on October 14, 2009, the power supply for neutron source range detector N-38 was determined to be unable to provide reliable power to detector N-38 and the detector was declared inoperable. Technical Specification (TS) 3.3.4 (Remote Shutdown) Basis Table 3.3.4-1, Function 1.a requires one channel. Technical Requirements Manual (TRM) 3.3.D (Appendix R Alternate Safe Shutdown Instrumentation) requires entry into the condition referenced in TRM Table 3.3.0-1 and entry into the applicable related TS referenced in TRM Table 3.3.D-1 when one or more required functions with one or more required instruments in Table 3.3.D-1 (are) inoperable. TRM Table 3.3.D-1, TRO 3.3.D1, neutron flux (source range only) lists and specifies detector N-38 only and references TS 3.3.4 Basis Table 3.3.4-1, Item 1a. Although there is an operable redundant source range neutron detector N-39, the only source range detector which has indication remote from the control room is N-38. Therefore, the safety function for safe shutdown remote from the control room for reactivity control in accordance with TS Basis Table 3.3.4-1, Function 1a can not be met with N-38 inoperable. The inability to meet the TS condition is a safety system functional failure. Actions are in progress to provide a reliable power supply for N-38. Unit 2 is at 100% and is not affected by the condition.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
19:00:00, 14 October 2009 +
45,432 +
17:09:00, 14 October 2009 +
19:00:00, 14 October 2009 +
At 1500 hours on October 14, 2009, the pow … At 1500 hours on October 14, 2009, the power supply for neutron source range detector N-38 was determined to be unable to provide reliable power to detector N-38 and the detector was declared inoperable. Technical Specification (TS) 3.3.4 (Remote Shutdown) Basis Table 3.3.4-1, Function 1.a requires one channel. Technical Requirements Manual (TRM) 3.3.D (Appendix R Alternate Safe Shutdown Instrumentation) requires entry into the condition referenced in TRM Table 3.3.0-1 and entry into the applicable related TS referenced in TRM Table 3.3.D-1 when one or more required functions with one or more required instruments in Table 3.3.D-1 (are) inoperable. TRM Table 3.3.D-1, TRO 3.3.D1, neutron flux (source range only) lists and specifies detector N-38 only and references TS 3.3.4 Basis Table 3.3.4-1, Item 1a. Although there is an operable redundant source range neutron detector N-39, the only source range detector which has indication remote from the control room is N-38. Therefore, the safety function for safe shutdown remote from the control room for reactivity control in accordance with TS Basis Table 3.3.4-1, Function 1a can not be met with N-38 inoperable. The inability to meet the TS condition is a safety system functional failure. Actions are in progress to provide a reliable power supply for N-38. Unit 2 is at 100% and is not affected by the condition.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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00:00:00, 14 October 2009 +
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22:31:31, 24 September 2017 +
17:09:00, 14 October 2009 +
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-0.0771 d (-1.85 hours, -0.011 weeks, -0.00253 months) +
19:00:00, 14 October 2009 +
Safety System Functional Failure - Alternate Safe Shutdown Source Range Neutron Monitor Inoperable +
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