ENS 56579

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v t e ENS Event
16:30 May 31, 2023
Title	Technical Specifications Power Limit Violation
Event Description	The following information was provided by the licensee via phone and email: [Oregon State University Radiation Center is] providing this information as a follow-up with the phone call to the Headquarters Operations Center made today at 1325 EDT (EN-56579). On the morning of 5/31/2023, a senior reactor operator and a trainee operator were performing a square-wave operation to raise power from 100 W to 1 MW. After firing the transient rod, the reactor immediately scrammed on both safety and percent power channels. Review of the chart recorder shows that reactor power likely reached 1.45 MW. This is potentially a violation of Technical Specification 3.1.1 which limits power to 1.1 MW during steady-state operations. Reviewing the power chart recorder, it appears that two immediately adjacent steps required for the square-wave operation were performed inadvertently out of order. The chart's sample rate is 1 Hz, so the resolution on the data is limited. Within 10 seconds, the final procedure steps for square-wave operation were performed (with the mode switch in square-wave mode). Once the transient rod air actuation button was pushed, starting the square-wave, the safety channel shortly thereafter (approximately 1 second) went from 0.02 percent to 145.91 percent of 1 MW. The reactor immediately scrammed and shut down the reactor as the safety and percent power channels exceeded their scram setpoints of 106 percent of 1 MW, which were checked on the daily startup checklist. The cause of the event was that two steps in the procedure were performed out of order, causing the regulating rod to withdraw to match demand power as the transient rod withdrew. As a result, this caused an additional 18 cents of reactivity to be inserted above the planned reactivity insertion of 80 cents. [Oregon State University Radiation Center plans] on following this up with a more thorough report within 14 days.

ENS 56579 +/-
Where
Oregon State University (Oreg) Corvallis, Oregon (NRC Region 0)
License number:	R-106
Reporting

Non
Time - Person (Reporting Time:+380.92 h15.872 days <br />2.267 weeks <br />0.522 months <br />)
Opened:	Steve Reese 13:25 Jun 16, 2023
NRC Officer:	Donald Norwood
Last Updated:	Jun 16, 2023
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v • d • e

v t e Emergency Notification System
Oregon State University with Non
WEEKMONTHYEAR2024-05-07T21:28:00 [Table view]
[ENS list for Oregon State University]

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