Performing routine thermal power calibration of nuclear instruments at indicated power of 230 kW per SOP-33. Calculation indicated actual power of 263 kW after collecting data. Licensed power limit is 250 kW.
No apparent cause for the calibration error. [The previous] calibration was successfully done on January 16, 2009.
The reactor was shutdown. All systems functioned as required. The licensee noted that the pool temperature was about 7 degrees Celsius cooler than the historical pool temperature.
The licensee will notify the NRR Project Manager and the State of Oregon.
- * * RETRACTION AT 1850 EST ON 2/11/09 FROM FRANTZ TO HUFFMAN * * *
The licensee re-performed the thermal calibration per SOP-33 to check results obtained on 2-08-09. The difference this time is the licensee extended the calibration for a much longer period (approximately 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />). The licensee has determined that data obtained during the first 30 to 60 minutes of calibration indicated erratic information.
[The licensee has] concluded that when [the reactor was] operating on 2-08-09 at an indicated power of 230 KW, actual power was 245 KW. [This power] is less than [the reactor's] licensed limit of 250 KW. Thus Reed did not violate its licensed power limit on 2-08-09 as previously reported. SOP-33 will be revised to avoid this error in the future.
Notified the
NRR PM (Hughes via e-mail) and
NRR EO (Lee). R4DO (Miller) was notified for information.