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On September 29, 2004, at 1235 hours (CDT) … On September 29, 2004, at 1235 hours (CDT), with Unit 3 at approximately 100 percent power in Mode 1, it was discovered that 3 of the 4 Unit 3 Isolation Condenser Time Delay Relays exceeded their Allowed Value specified in Technical Specification 3.3.5.2, "Isolation Condenser (IC) System Instrumentation." The event was discovered while performing Surveillance Procedure DIS 1300-08, "Sustained High Reactor Pressure Time Delay Relay Calibration." This event identified that two independent channels of the time delay portion of the Unit 3 Isolation Condenser Initiation Logic were inoperable and is being reported under 10 CFR 50.73(a)(2)(vii), "), "Any event where a single cause or condition caused at least one independent train or channel to become inoperable in multiple systems or two independent trains or channels to become inoperable in a single system." Additionally, this event is being reported under 10 CFR 50.73(a)(2)(i)(B), "Operation or condition prohibited by Technical Specifications." The Isolation Condenser Time Delay Relays were previously calibrated on June 16, 2002 by using a stopwatch.</br></br>The root cause of the event was due to an ineffective extent of condition review for a corrective action associated with a 1996 event in which stopwatches were determined to not be sensitive enough for calibration checks on components with limited margin. The corrective action to prevent recurrence was to use a strip chart recorder for calibrating the Isolation Condenser Time Delay Relays.the Isolation Condenser Time Delay Relays. +
September 29, 2004 +
On September 29, 2004, at 1235 hours (CDT) … On September 29, 2004, at 1235 hours (CDT), with Unit 3 at approximately 100 percent power in Mode 1, it was discovered that 3 of the 4 Unit 3 Isolation Condenser Time Delay Relays exceeded their Allowed Value specified in Technical Specification 3.3.5.2, "Isolation Condenser (IC) System Instrumentation." The event was discovered while performing Surveillance Procedure DIS 1300-08, "Sustained High Reactor Pressure Time Delay Relay Calibration." This event identified that two independent channels of the time delay portion of the Unit 3 Isolation Condenser Initiation Logic were inoperable and is being reported under 10 CFR 50.73(a)(2)(vii), "), "Any event where a single cause or condition caused at least one independent train or channel to become inoperable in multiple systems or two independent trains or channels to become inoperable in a single system." Additionally, this event is being reported under 10 CFR 50.73(a)(2)(i)(B), "Operation or condition prohibited by Technical Specifications." The Isolation Condenser Time Delay Relays were previously calibrated on June 16, 2002 by using a stopwatch.</br></br>The root cause of the event was due to an ineffective extent of condition review for a corrective action associated with a 1996 event in which stopwatches were determined to not be sensitive enough for calibration checks on components with limited margin. The corrective action to prevent recurrence was to use a strip chart recorder for calibrating the Isolation Condenser Time Delay Relays.the Isolation Condenser Time Delay Relays. +
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15:12:16, 27 November 2017 +
November 29, 2004 +
September 29, 2004 +
TS-3.5.3 + and TS-3.3.5.2 +
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