ENS 55632: Difference between revisions
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| unit = | | unit = | ||
| utype = | | utype = | ||
| cfr = 10 CFR 50.72(b)(1) | | cfr = 10 CFR 50.72(b)(1), Non | ||
| emergency class = Non Emergency | | emergency class = Non Emergency | ||
| notification date = 12/08/2021 14:22 | | notification date = 12/08/2021 14:22 | ||
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| event date = 12/07/2021 12:48 EST | | event date = 12/07/2021 12:48 EST | ||
| last update date = 12/08/2021 | | last update date = 12/08/2021 | ||
| title = Research Reactor Tech Spec Deviation Resulting in a Reactor | | title = Research Reactor Tech Spec Deviation Resulting in a Reactor Scram | ||
| event text = On 12/7/2021 at 1248 EST, the Breazeale reactor (50-005) [a TRIGA reactor] was operating for a NUCE 451 lab. The reactor operator was trying to perform a $0.75 [measure of reactivity] square wave with a setpoint of 500 kW. When the operator entered the setpoint, he did not hit ENTER so the 500 kW was not stored in the console, which defaulted to the current power level (100 W) as the setpoint. | | event text = On 12/7/2021 at 1248 EST, the Breazeale reactor (50-005) [a TRIGA reactor] was operating for a NUCE 451 lab. The reactor operator was trying to perform a $0.75 [measure of reactivity] square wave with a setpoint of 500 kW. When the operator entered the setpoint, he did not hit ENTER so the 500 kW was not stored in the console, which defaulted to the current power level (100 W) as the setpoint. | ||
Once the square wave was executed, the control rods immediately began to move in to counter the $0.75 of reactivity from the pulse rod and maintain the power level at 100 W. The operator noticed that the setpoint was incorrect, and after 9 seconds, changed the power setpoint to 500 kW. At this time, the rod bank began to move out, adding $1.20 over the course of 4 seconds. (The maximum total reactivity beyond critical is estimated to be ~$1.10). | Once the square wave was executed, the control rods immediately began to move in to counter the $0.75 of reactivity from the pulse rod and maintain the power level at 100 W. The operator noticed that the setpoint was incorrect, and after 9 seconds, changed the power setpoint to 500 kW. At this time, the rod bank began to move out, adding $1.20 over the course of 4 seconds. (The maximum total reactivity beyond critical is estimated to be ~$1.10). | ||
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A detailed written report will be sent to the Reactor Safeguards Committee and NRC by December 21st. | A detailed written report will be sent to the Reactor Safeguards Committee and NRC by December 21st. | ||
The licensee will notify the Non-Power Production or Utilization Facility (NPUF) Licensing Branch Project Manager. | The licensee will notify the Non-Power Production or Utilization Facility (NPUF) Licensing Branch Project Manager. | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/ | | URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20211210en.html#en55632 | ||
}} | }} | ||
{{ENS-Nav}} | {{ENS-Nav}} | ||
Latest revision as of 16:03, 4 January 2024
| Where | |
|---|---|
| Penn State University (Penn) University Park, Pennsylvania (NRC Region 0) | |
| License number: | R-2 |
| Reporting | |
| 10 CFR 50.72(b)(1), 50.54(x) TS Deviation Non | |
| Time - Person (Reporting Time:+20.57 h0.857 days <br />0.122 weeks <br />0.0282 months <br />) | |
| Opened: | Jeffrey Geuther 14:22 Dec 8, 2021 |
| NRC Officer: | Karen Cotton-Gross |
| Last Updated: | Dec 8, 2021 |
| 55632 - NRC Website | |