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The following information was provided by … The following information was provided by the licensee via phone and email:</br>On April 9, 2026, at approximately 1230 CDT, upon reviewing operator requalification data, Missouri University of Science and Technology Reactor (MSTR) staff determined that a licensed reactor operator did not have a current medical evaluation as required by 10 CFR 55.21. A follow-up examination was due no later than March 21, 2026. The operator was suspended from further operations until compliance with 10 CFR 55.21 was restored. However, in reviewing operations since the lapsed medical evaluation, it was determined that this operator performed licensed duties over eight shifts while out of compliance.</br>Upon review with facility staff, it was determined that during approximately 75 percent of the licensed duties, at least one additional licensed operator was present in the control room for record keeping and instrumentation monitoring to support planned transients and facility evolutions. However, during the remaining operations when other licensed personnel were not present, the facility deviated from 10 CFR 50.54(k), which requires the presence of a licensed operator at the controls or, under 10 CFR 55.13, supervising a student or trainee at the controls. Additionally, the facility deviated from Technical Specification 6.1.3.1.a), which requires the presence of a licensed operator in the control room during operations. </br>At no point was the health and safety of the public or MSTR in doubt. The operator remained physically capable of performing licensed duties during the non-compliant periods and successfully underwent medical evaluation on April 10, 2026.</br>This report is being made under the provisions of MSTR Technical Specification 6.7.2, requiring a report by telephone to the NRC Headquarters Operations Center no later than the following working day. Under the provisions of MSTR Technical Specification 6.7.2, a written follow-up report will be submitted to the Commission within 14 days.</br>This event will be entered into the facility Corrective Action Program as CAP-2026-003, and the facility project manager will be notified.facility project manager will be notified.
17:30:00, 9 April 2026 +
58,240 +
22:37:00, 10 April 2026 +
17:30:00, 9 April 2026 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>On April 9, 2026, at approximately 1230 CDT, upon reviewing operator requalification data, Missouri University of Science and Technology Reactor (MSTR) staff determined that a licensed reactor operator did not have a current medical evaluation as required by 10 CFR 55.21. A follow-up examination was due no later than March 21, 2026. The operator was suspended from further operations until compliance with 10 CFR 55.21 was restored. However, in reviewing operations since the lapsed medical evaluation, it was determined that this operator performed licensed duties over eight shifts while out of compliance.</br>Upon review with facility staff, it was determined that during approximately 75 percent of the licensed duties, at least one additional licensed operator was present in the control room for record keeping and instrumentation monitoring to support planned transients and facility evolutions. However, during the remaining operations when other licensed personnel were not present, the facility deviated from 10 CFR 50.54(k), which requires the presence of a licensed operator at the controls or, under 10 CFR 55.13, supervising a student or trainee at the controls. Additionally, the facility deviated from Technical Specification 6.1.3.1.a), which requires the presence of a licensed operator in the control room during operations. </br>At no point was the health and safety of the public or MSTR in doubt. The operator remained physically capable of performing licensed duties during the non-compliant periods and successfully underwent medical evaluation on April 10, 2026.</br>This report is being made under the provisions of MSTR Technical Specification 6.7.2, requiring a report by telephone to the NRC Headquarters Operations Center no later than the following working day. Under the provisions of MSTR Technical Specification 6.7.2, a written follow-up report will be submitted to the Commission within 14 days.</br>This event will be entered into the facility Corrective Action Program as CAP-2026-003, and the facility project manager will be notified.facility project manager will be notified.
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00:00:00, 10 April 2026 +
R-79 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
03:42:27, 20 April 2026 +
22:37:00, 10 April 2026 +
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1.213 d (29.12 hours, 0.173 weeks, 0.0399 months) +
17:30:00, 9 April 2026 +
TS-6.1.3.1 + and TS-6.7.2 +
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