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The following details were provided by the … The following details were provided by the licensee via email after the telephonic notification:</br>This is a non-emergency Event Notification in accordance with 10 CFR 20.2201(a)(1)(ii) to inform the NRC of missing special nuclear material (SNM) (up to approximately 0.15 grams of U235). The missing SNM consists of one complete and three partial in-core detectors. </br>Since June 2004, Pacific Gas and Electric (PG&E) has been performing an investigation and search for three missing 18-inch rod segments at the Humboldt Bay Power Plant (HBPP) (reference NRC Event Notifications 40877 and 40963). The investigation also included a verification of the inventory of all SNM, including fuel and non-fuel SNM. As a result of the investigation, plant personnel identified HBPP records that indicate 54 in-core detectors should be in the spent fuel pool (SFP). </br>In-core detectors were used inside in-core assemblies during plant operations to measure reactor power level. There were three in-core detectors contained inside each in-core assembly. The in-core assemblies were segmented for storage, and the in-core detectors from a total of 18 in-core assemblies (containing 54 in-core detectors) should be onsite. Each in-core detector is approximately 2-1/2 inches long. Depending on design, an in-core detector contains as much as 0.04 grams of U235, to slightly less than 0.002 grams of U235. </br>PG&E personnel performed a search in the SFP for the in-core detectors from December 2004 through February 2005. On February 4, 2005, PG&E determined that not all 54 in-core detectors could be located and informed the NRC. PG&E is submitting this Event Notification in accordance with 10 CFR 20.2201(a)(1)(ii) that requires a telephonic report and an Event Notification to be made within 30 days from February 4, 2005. </br>PG&E will be issuing a press release tomorrow that includes this issue.</br>PG&E's search for in-core detectors is complete. PG&E has determined that 50 complete and three partial in-core detectors are in the SFP. Therefore, one complete and three partial in-core detectors are missing. The partial in-core detectors appear to have been cut when the in-core assemblies were cut to be shortened for SFP storage in the mid-1970s or mid-1980s.</br>Most probable locations for the missing in-core detectors are licensed, monitored and restricted radiological control areas, therefore the public health and safety has not been adversely affected.</br>PG&E will issue licensee event report (LER) 2005-001-00, 'Missing In-core Detectors,' dated February 22, 2005, to be submitted in accordance with 10 CFR 20.2201(b)(2)(ii) (Reference PG&E Letter HBL-05-002). Information pertaining to the missing in-core detectors is also included in the HBPP SNM Control and Accountability Project Interim Reports, to be submitted February 22, 2005 (Reference PG&E Letter HBL-05-001).</br>NRC personnel at headquarters and in Region IV have been notified of the status of this issue.l at headquarters and in Region IV have been notified of the status of this issue.
22:25:00, 22 February 2005 +
17:25:00, 22 February 2005 +
22:25:00, 22 February 2005 +
The following details were provided by the … The following details were provided by the licensee via email after the telephonic notification:</br>This is a non-emergency Event Notification in accordance with 10 CFR 20.2201(a)(1)(ii) to inform the NRC of missing special nuclear material (SNM) (up to approximately 0.15 grams of U235). The missing SNM consists of one complete and three partial in-core detectors. </br>Since June 2004, Pacific Gas and Electric (PG&E) has been performing an investigation and search for three missing 18-inch rod segments at the Humboldt Bay Power Plant (HBPP) (reference NRC Event Notifications 40877 and 40963). The investigation also included a verification of the inventory of all SNM, including fuel and non-fuel SNM. As a result of the investigation, plant personnel identified HBPP records that indicate 54 in-core detectors should be in the spent fuel pool (SFP). </br>In-core detectors were used inside in-core assemblies during plant operations to measure reactor power level. There were three in-core detectors contained inside each in-core assembly. The in-core assemblies were segmented for storage, and the in-core detectors from a total of 18 in-core assemblies (containing 54 in-core detectors) should be onsite. Each in-core detector is approximately 2-1/2 inches long. Depending on design, an in-core detector contains as much as 0.04 grams of U235, to slightly less than 0.002 grams of U235. </br>PG&E personnel performed a search in the SFP for the in-core detectors from December 2004 through February 2005. On February 4, 2005, PG&E determined that not all 54 in-core detectors could be located and informed the NRC. PG&E is submitting this Event Notification in accordance with 10 CFR 20.2201(a)(1)(ii) that requires a telephonic report and an Event Notification to be made within 30 days from February 4, 2005. </br>PG&E will be issuing a press release tomorrow that includes this issue.</br>PG&E's search for in-core detectors is complete. PG&E has determined that 50 complete and three partial in-core detectors are in the SFP. Therefore, one complete and three partial in-core detectors are missing. The partial in-core detectors appear to have been cut when the in-core assemblies were cut to be shortened for SFP storage in the mid-1970s or mid-1980s.</br>Most probable locations for the missing in-core detectors are licensed, monitored and restricted radiological control areas, therefore the public health and safety has not been adversely affected.</br>PG&E will issue licensee event report (LER) 2005-001-00, 'Missing In-core Detectors,' dated February 22, 2005, to be submitted in accordance with 10 CFR 20.2201(b)(2)(ii) (Reference PG&E Letter HBL-05-002). Information pertaining to the missing in-core detectors is also included in the HBPP SNM Control and Accountability Project Interim Reports, to be submitted February 22, 2005 (Reference PG&E Letter HBL-05-001).</br>NRC personnel at headquarters and in Region IV have been notified of the status of this issue.l at headquarters and in Region IV have been notified of the status of this issue.
HBL-05-002 + and HBL-05-001 +
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00:00:00, 22 February 2005 +
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22:25:00, 22 February 2005 +
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