Event Notification Report for July 22, 2022

INVALID ACTUATION OF AUXILIARY FEEDWATER

The following information was provided by the licensee via email:

"This 60-day telephone notification is being made under the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of the auxiliary feedwater system. At 1949 Central Daylight Time (CDT), on 7/22/22, an invalid actuation of the auxiliary feedwater system occurred due to human error. At the time of the event, Wolf Creek Generating Station was coming out of a forced outage. Plant conditions were 47 percent power with operators increasing power approximately 10 percent per hour. At this power level there was one main feedwater pump in service and Operations was performing the procedure to place the second main feedwater pump into service. A control room operator was verifying that the control oil switches were not tripped for the main feedwater pumps by verifying the bulbs for both the 'A' and 'B' trains were not lit. To verify the unlit bulbs were not burnt out, the operator was pushing the lamp test buttons. The operator successfully verified the 'A' train, but on the 'B' train the operator mistakenly pushed the bi-stable which is located directly above the bulb rather than the lamp test button. This bi-stable is the low oil pressure switch for the 'A' main feedwater pump. Because the second feedwater pump was not running yet, this caused a 'two out of two' signal for low oil pressure and caused an auxiliary feedwater system actuation.

"The auxiliary feedwater system responded correctly and was returned to standby condition.

"The Senior Resident Inspector has been notified."

EN Revision Imported Date: 7/28/2022

EN Revision Text: DAMAGED NUCLEAR GAUGE

The following information is a synopsis provided by the licensee via email:

An incident involving a Nuclear Gauge #26 (CPN MC1 DR serial# MD60503240) on a job site (#37: 1564-C) at about 1315 EDT on 07/22/22 in SE Washington, DC 20032. The gauge contained the following sealed sources: 370 MBq (10 mCi) Cs-137 01/17/96 and 1.85 GBq (50 mCi) Am-241/Be 03/27/96.

The gauge was damaged by an excavator while it was under the control of an authorized user (AU). The AU went to their car about 50 feet away to grab some paperwork. The operator of the excavator did not see the gauge, and hit it hard enough to crack its plastic shell. The source rod and electronics were not damaged.

The AU informed an ECS field supervisor about the incident immediately and cordoned off the 15 foot radius of an area around the damaged gauge. The back-up radiation safety officer (RSO), was contacted and came to the site to evaluate the damage. The gauge's plastic case was broken due to the impact, but the sources were in the shielded position. Several surveys were made using a survey meter (RADIATION Alert M4, calibrated on 12/22/21) at one meter distance, and the readings were found to be less than 0.4 mR/hr range.

In addition to contacting the NRC Operations Center on 7/22/22, the Virginia Department of Health was informed at 1755 EDT the same day.

All the pieces of the gauge were placed in a box and it was hauled back to the designated storage area in the Chantilly, VA office around 1700 EDT. After performing a leak test and once an all-clear report is received, the damaged gauge will be returned to the authorized distributor in the area, for them to repair it properly.

All authorized users will be informed about the incident immediately, and this will be discussed in detail at our safety meetings to reiterate and stress the importance of maintaining physical control of gauges when the gauge is not otherwise secured using two independent physical locking systems to prevent unauthorized access or removal.

AGREEMENT STATE REPORT - MISSING MOISTURE DENSITY GAUGE

The following information was provided by the Florida Bureau of Radiation Control via email:

"On 07/22/22 at 1626 EDT, [the Alchua office] Radiation Safety Officer of TRC Engineers called to report that a Troxler 3440 [gauge was shipped] from the Alchua office of TRC to the West Virginia office of TRC via a common carrier. Tracking by the common carrier depicts the package to have arrived at its Memphis facility on 07/22/22 at 1125 EDT. [The package] is reported as delayed/pending per its website. The licensee is working with the common carrier to try to determine why the Troxler Gauge has not been delivered."

Florida Incident Number: FL22-084

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

EN Revision Imported Date: 8/17/2022

EN Revision Text: AUXILIARY FEEDWATER ACTUATION SIGNAL RECEIVED DUE TO HUMAN PERFORMANCE ERROR

The following information was provided by the licensee via email:

"At 1949 CDT, while operating in Mode 1 at 46 percent power, an Auxiliary Feedwater actuation signal resulted from a human performance error while performing SYS AE-121 to place a second main feedwater pump in service. All systems responded correctly and were restored to standby condition. The Unit remained in Mode 1, at 47 percent power following the actuation. This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the Auxiliary Feedwater System.

"The Senior NRC Resident Inspector has been informed."

* * * RETRACTION ON 8/16/22 AT 1406 EDT FROM JASON KNUST TO BRIAN P. SMITH * * *

"Wolf Creek is retracting the original notification (EN# 56013) of a valid actuation and has recategorized this as a 60-day optional (see EN #56047)."

Notified R4DO (Werner)

AGREEMENT STATE REPORT - MOISTURE DENSITY GAUGE LOST DURING SHIPPING

The following information was received via E-mail:

"The Department [Arizona Department of Health Services] was notified that a Humboldt 5001EZ, SN 1981, has been lost at an XPO shipping facility in Phoenix, Arizona. The gauge contains 10 mCi of Cesium-137 and 40 mCi of Americium-241.

"A reciprocity licensee, Geo-Logic Associates, dropped off the gauge at an XPO facility in Sacramento on July 15, 2022. The gauge then shipped on July 18, 2022 and arrived at the Phoenix XPO facility in Phoenix, Arizona on July 20, 2022. A company technician attempted to pick up the gauge on the afternoon of July 22, 2022 but was told that the XPO facility was unable to locate the gauge.

"Additional information will be provided as it is received in accordance with SA-300."

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

AGREEMENT STATE REPORT - FAILURE OF SOURCE TO RETRACT

The following is a synopsis of information received via E-mail:

This information was reported to the Maine Radiation Control Program by the licensee at 0302 EDT on July 23, 2022. A guide tube crank-in problem occurred at 1445 EDT on July 22, 2022 in Westbrook, Maine in an area enclosed by fencing where natural gas pipe work was on-going. The problem was resolved at 0145 EDT on July 23, 2022.

During radiography operations, the guide tube was damaged and the source would not crank in. The crew did not force it and cranked it back to the collimator. The radiation safety officer was called and a retrieval team was dispatched. The tube was repaired enough to crank in the source. The activity and isotope involved was 76 curies of Ir-192. No exposures were reported and the media was not contacted.