Event Notification Report for August 16, 2024

EN Revision Imported Date: 8/16/2024

EN Revision Text: INOPERABILITY OF DIVISION 3 DIESEL GENERATOR SUPPORTING HIGH PRESSURE CORE SPRAY

The following information was provided by the licensee via phone and email:

"At 1640 EDT on 06/18/2024, the division 3 diesel generator was declared inoperable. This condition could prevent the fulfillment of a safety function; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). All other emergency core cooling systems were operable during this time.

"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.

"The division 3 diesel generator was declared inoperable due to potential water intrusion into the electrical generator. Inspection of the generator is in progress."


The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:

This event resulted in Perry Unit 1 entering a 72 hour limiting condition for operation (LCO) in accordance with Technical Specification 3.8.1. condition 'B'.

* * * RETRACTION ON 8/15/2024 AT 0943 EDT FROM TONY MCGOWAN TO ERNEST WEST * * *

"Investigation and assessment of the division 3 diesel generator exciter and generator as-found condition revealed that no water intrusion occurred and, therefore, would not have impacted the diesel generator's ability to start, run, and produce the required electrical power to perform its required safety function. Therefore, EN 57181 is being retracted.

"The NRC resident inspector has been notified of the Event Notification retraction."

Notified R3DO (Feliz-Adorno)

AGREEMENT STATE - LOST STATIC ELIMINATOR

The following is a summary of information provided by the Colorado Department of Public Health and Environment (the Department) via email:

The Department reported that on August 7, 2024, the licensee notified them of a lost NRD model P-2021 static eliminator containing 0.7 mCi of polonium 210. The licensee continues to search for the device.

Colorado event ID: CO240020

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 - DAMAGED MOISTURE DENSITY GAUGE

The following information was provided by the New York State Department of Health (NYSDOH) via email:

"NYSDOH received a phone call from the radiation safety officer (RSO) on August 7, 2024, to report a damaged moisture density gauge. The gauge was struck by a passing skid steer.

"Device Make: Instrotek
"Device Model: 3500
"Isotopes: Am-241/Be (44mCi), Cs-137 (11mCi)

"The area was cordoned off. The gauge base plate appeared damaged. The source rod was not exposed. Measurements taken with a survey meter were 0.2 mR/hr at 3ft, which appears consistent with the radiation dose profile for this instrument per the sealed source and device registry.

"The RSO reports that the device was removed from the site at the request of the client and transported to the Kleinfelder Scranton, PA, location for leak testing. A leak test was performed and sent out for analysis, however, at this time is not believed that the source would be leaking. It is not believed that this event led to any degradation of the source, source housing, or shielding. NYSDOH is monitoring this incident and has assigned incident number 1496 to track this event.

"As this company was performing work under reciprocity, the State of Maryland and the Commonwealth of Pennsylvania have also been notified of this event for their awareness. Additional information will be provided to NMED once available."

New York event report ID: NY-24-07

* * * UPDATE ON 08/09/2024 AT 1643 EDT FROM ATNATIWOS MESHESHA TO JOSUE RAMIREZ * * *

This event was also reported by the State of Maryland under EN 57267.

Notified R1DO (Bickett), NMSS Events Notifications (Email).

AGREEMENT STATE - DAMAGED MOISTURE DENSITY GAUGE

The following information was provided by the Maryland Department of the Environment (MDE) via email:

"This report is made in accordance with 10 CFR 30.50 (b)(2).

"At 1045 EDT on 8/7/2024, an Instrotek 3500 nuclear density gauge (serial number 566), containing a 10 mCi Cs-137 source and a 40 mCi Am-241 source, was struck by site equipment (skid steer) during asphalt placement operations in Syracuse, NY. The gauge was licensed to, and being operated by, Kleinfelder, a Maryland licensee (MD-05-248-01) and used in New York under reciprocity arrangement. The base plate of the gauge was damaged, but there was no observable damage to the source rod and it was retracted to the safe position at the time of the accident. Kleinfelder contracted a third party to complete a survey and no elevated levels of radiation were detected. The gauge was then transported to the Kleinfelder office, located in Mechanicsburg, PA, and tested for source leakage. MDE was notified on 8/8/2024 at 1258 EDT and requested that the gauge be tested for leakage. Leak tests later showed no leakage of radioactive material. At this time, the gauge is returned to the licensee storage in Maryland and [placed] out-of-service."

The State of New York also reported this event on August 8, 2024, under EN 57266.

PART 21 - COMMERCIALLY SOURCED PART NOT PROPERLY HEAT TREATED

The following information was provided by the licensee via phone and email:

"On August 13, 2024, Diablo Canyon Power Plant (DCPP) determined that a manufacturing non-conformance associated with snubber valve assemblies identified with ALCO part number 2402466 is reportable under 10 CFR Part 21.

"Pacific Gas and Electric Company's (PGE) evaluation has determined the upper body of these valves did not meet material and heat treatment requirements (AISI 1117 resulfurized carbon steel vs. AISI 8620/8630 low alloy steel). Similar Part 21 reports regarding issues associated with the material and heat treatment requirements of ALCO snubber valves have been previously reported by others. The subject parts were procured as commercial grade items and dedicated by PGE solely for use at DCPP. Therefore, although previously reported, and potentially not required per the provisions of Part 21.21 (d)(2), DCPP is conservatively making this notification.

"There is no impact to the operability of any safety related systems or impact to the health and safety of the public. All spare valve assemblies have been removed from PGE's warehouse. The NRC senior resident inspector has been notified, and a written report will be submitted within 30 days."

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:

No other nuclear power plants were affected.