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Event Notification Report for July 01, 2020

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
6/30/2020 - 7/1/2020

** EVENT NUMBERS **


54754 54760

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Agreement State Event Number: 54754
Rep Org: CALIFORNIA RADIATION CONTROL PRGM
Licensee: HKH Engineering, Inc. dba: Earthspectives
Region: 4
City: Santa Ana   State: CA
County:
License #: 6518-30
Agreement: Y
Docket:
NRC Notified By: Robert Greger
HQ OPS Officer: Kerby Scales
Notification Date: 06/22/2020
Notification Time: 15:43 [ET]
Event Date: 06/18/2020
Event Time: 00:00 [PDT]
Last Update Date: 06/22/2020
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
JEFFREY JOSEY (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)

Event Text

AGREEMENT STATE REPORT - LEAKING SEALED SOURCE

The following was received from the state of California via email:

"The Radiologic Health Branch was notified by the facility RSO [Radiation Safety Officer] that he detected radiation levels approximately 20 times background on a small subassembly piece that he had replaced for his Mount Sopris Instrument Co, Model HLP-2375 logging tool. The Mt. Sopris supplied sub-assembly contains an Isotope Products Lab model HEG series Cs-137 sealed source # B2-951 (100 mCi on ref. date 7/1/2003).

"On June 19, 2020, a wipe from the subassembly piece was measured using a pancake GM (with 15 percent efficiency for Cs-137), and showed approximately 1 microCi activity."

California Event ID Number: 061820

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Part 21 Event Number: 54760
Rep Org: PARAGON ENERGY SOLUTIONS
Licensee: Paragon Energy Solutions
Region: 4
City: Fort Worth   State: TX
County:
License #:
Agreement: Y
Docket:
NRC Notified By: Tracy Bolt
HQ OPS Officer: Brian Lin
Notification Date: 06/30/2020
Notification Time: 17:41 [ET]
Event Date: 06/01/2020
Event Time: 00:00 [CDT]
Last Update Date: 06/30/2020
Emergency Class: Non Emergency
10 CFR Section:
21.21(d)(3)(i) - Defects And Noncompliance
Person (Organization):
DAVE WERKHEISER (R1DO)
MARK MILLER (R2DO)
PATRICIA SILVA (R4DO)
- PART 21/50.55 REACTORS (EMAIL)

Event Text

PART 21 - FAILURE OF SIZE 1 AND 2 FREEDOM SERIES AUXILIARY CONTACTS

The following is a summary of information received from Paragon Energy Solutions:

DUKE Harris Nuclear Plant (HNP) has identified instances where Size 1 and 2 Eaton Freedom Series starters have failed to function as expected in assemblies that were originally supplied by NLI. The auxiliary contacts have degraded prematurely and have failed to change state when the starter was energized which has affected indication and other controlling actions within the circuit.

The premature degradation of the auxiliary contacts with the old model NLI special coil, part number: 057018-COIL-1/2, has occurred on size 1 and 2 contactors that were continuously energized with significant run time after approximately 3 to 5 years of service time. HNP has provided information to manage the known degradation. The auxiliary contacts should be replaced at an increased frequency until new auxiliary contacts are installed along with the new design NLI special coil, part number: 057018-COIL-1/2-M.

The nature of the defect is the pre-mature aging of the component within the auxiliary contact mechanism that is adjacent to the operating coil. The starter coil is potentially being subjected to voltages of a nature that elevates the temperature within the starter adjacent to the auxiliary contacts.

It is recommended that the starters and coils be replaced in the applications where the units are being operated in a continuous duty application. It is also recommended that the control transformer be replaced with a true 4:1 ratio transformer. Paragon/NLI has developed a true 4:1 ratio transformer that will provide additional mitigation of this potential over-voltage condition. Replacing the transformer with a true 4:1 ratio reduces the control voltage that is being applied to the control circuit in a manner that will not prevent the unit from providing a sufficient voltage during a degraded voltage condition, and also will not subject the components to a voltage above the ratings when the supply voltage is operated above the nominal 480 VAC bus voltage.

Paragon has no other recommendations as the accelerated aging of the components and the expected life based on the additional heat the units have been subjected to is unknown.

Affected plants:
Sharon Harris
Oconee
Turkey Point
Columbia
North Anna
Waterford
River Bend
Beaver Valley

Should you have any questions regarding this matter, please contact:
Tracy Bolt
Chief Nuclear Officer
Paragon Energy Solutions
817-284-0077
tbolt@paragones.com


Page Last Reviewed/Updated Wednesday, July 01, 2020
Wednesday, July 01, 2020