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On March 19, 2011, during the Byron Statio … On March 19, 2011, during the Byron Station Unit 1 refueling outage, it was determined that the results of planned ultrasonic (UT) examinations performed on two penetrations of the reactor vessel head would not meet the applicable acceptance criteria. Both require repair prior to returning the vessel head to service. These indications are not in the reactor coolant pressure boundary; however they are very near the toe of the J-groove weld. The examinations were being performed to meet the requirements of 10CFR50.55a(g)(6)(ii)(D) and ASME Code Case N-729-1, to ensure the structural integrity of the reactor vessel head pressure boundary. The UT examinations continue for the remaining head penetrations. All of the penetrations will be examined during the current refueling outage. Repairs are currently being planned and will be competed prior to startup.</br>This is reportable pursuant to 10CFR50.72(b)(3)(ii)(A) since the as found indications did not meet the applicable acceptance criteria referenced in ASME Code Case N-729-1 to remain in-service without repair.</br>The NRC Resident Inspector has been notified.</br>* * * UPDATE FROM BLAINE PETERS TO JOHN SHOEMAKER AT 0910 EDT ON 03/30/11 * * *</br>Ultrasonic examination (made on March 19, 2011) resulted in indications on two reactor head penetrations.</br>As mentioned in Event Notification 46686, reactor vessel head penetrations (In-service inspection) ISI examinations were still in progress. On Wednesday, March 30, 2011, two additional Unit 1 reactor head penetrations were found to contain indications that will require repair prior to returning the reactor head to service. The indications on these two penetrations are within the reactor vessel head pressure boundary.</br>The NRC Resident Inspector has been notified by the licensee.</br>Notified the R3DO (Peterson).he licensee.
Notified the R3DO (Peterson). +
13:00:00, 19 March 2011 +
46,686 +
16:21:00, 19 March 2011 +
13:00:00, 19 March 2011 +
On March 19, 2011, during the Byron Statio … On March 19, 2011, during the Byron Station Unit 1 refueling outage, it was determined that the results of planned ultrasonic (UT) examinations performed on two penetrations of the reactor vessel head would not meet the applicable acceptance criteria. Both require repair prior to returning the vessel head to service. These indications are not in the reactor coolant pressure boundary; however they are very near the toe of the J-groove weld. The examinations were being performed to meet the requirements of 10CFR50.55a(g)(6)(ii)(D) and ASME Code Case N-729-1, to ensure the structural integrity of the reactor vessel head pressure boundary. The UT examinations continue for the remaining head penetrations. All of the penetrations will be examined during the current refueling outage. Repairs are currently being planned and will be competed prior to startup.</br>This is reportable pursuant to 10CFR50.72(b)(3)(ii)(A) since the as found indications did not meet the applicable acceptance criteria referenced in ASME Code Case N-729-1 to remain in-service without repair.</br>The NRC Resident Inspector has been notified.</br>* * * UPDATE FROM BLAINE PETERS TO JOHN SHOEMAKER AT 0910 EDT ON 03/30/11 * * *</br>Ultrasonic examination (made on March 19, 2011) resulted in indications on two reactor head penetrations.</br>As mentioned in Event Notification 46686, reactor vessel head penetrations (In-service inspection) ISI examinations were still in progress. On Wednesday, March 30, 2011, two additional Unit 1 reactor head penetrations were found to contain indications that will require repair prior to returning the reactor head to service. The indications on these two penetrations are within the reactor vessel head pressure boundary.</br>The NRC Resident Inspector has been notified by the licensee.</br>Notified the R3DO (Peterson).he licensee.
Notified the R3DO (Peterson). +
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