05000400/LER-2021-005, Past Inoperability of Effluent Accident Monitor Exceeded Time Allowed by Technical Specifications
| ML21235A012 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 08/23/2021 |
| From: | Dills J Duke Energy Progress |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA-21-0210 LER 2021-005-00 | |
| Download: ML21235A012 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| 4002021005R00 - NRC Website | |
text
John R. Dills Plant Manager Shearon Harris Nuclear Power Plant 5413 Shearon Harris Road New Hill, NC 27562-9300 10 CFR 50.73 August 23, 2021 Serial: RA-21-0210 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Shearon Harris Nuclear Power Plant, Unit 1 Docket No. 50-400/Renewed License No. NPF-63 Subject: Licensee Event Report 2021-005-00 Ladies and Gentlemen:
Duke Energy Progress, LLC, submits the enclosed Licensee Event Report 2021-005-00 in accordance with 10 CFR 50.73 for Shearon Harris Nuclear Power Plant, Unit 1 (HNP). This report describes a condition where the past inoperability of an effluent accident monitor exceeded the time allowed by Technical Specifications. This event had no significance with respect to the health and safety of the public.
There are no regulatory commitments contained within this report.
Please refer any questions regarding this submittal to Sarah McDaniel at (984) 229-2002.
Sincerely, John R. Dills Enclosure: Licensee Event Report 2021-005-00 cc:
J. Zeiler, NRC Senior Resident Inspector, HNP M. Mahoney, NRC Project Manager, HNP NRC Regional Administrator, Region II
(_~ DUKE ENERGY
Abstract
Shearon Harris Nuclear Power Plant, Unit 1 400 3
Past Inoperability of Effluent Accident Monitor Exceeded Time Allowed by Technical Specifications 6
22 2021 2021 005 00 8
23 2021 1
100
Sarah McDaniel, Regulatory Affairs Engineer (984) 229-2002 A
IL MON S637 Y
On June 22, 2021, the Waste Processing Building (WPB) Vent Stack 5A High Range Noble Gas Radiation Monitor was found to have incorrect database values used for flow rate measurement, which rendered this monitor inoperable. The database values for this radiation monitor were immediately corrected upon discovery of this condition and operability was restored on June 22, 2021. Following investigation, it was determined that this radiation monitor was inoperable since October 6, 2020. During completion of a surveillance test on this radiation monitor on October 6th, the database values were restored incorrectly.
Maintenance personnel did not recognize a note in the Radiation Monitor Data Sheet Library that requires substitute values to be entered when the flow transmitter for this radiation monitor is inoperable. Since this radiation monitor was not known to be inoperable from October 6, 2020, through June 22, 2021, no alternate method for monitoring was implemented and no special report was completed as required by Technical Specifications (TS). The WPB Vent Stack 5A High Range Noble Gas Radiation Monitor is credited as one of two WPB exhaust effluent monitors in TS Table 3.3-10, Accident Monitoring Instrumentation. This event had no significance with respect to the health and safety of the public. Actions to ensure tracking of the flow rate monitor status have been completed.
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- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
C. Causal Factors During completion of a surveillance test on this radiation monitor on October 6, 2020, maintenance personnel did not recognize a note in the Radiation Monitor Data Sheet Library that requires substitute values to be entered when the flow transmitter for this radiation monitor is inoperable. From investigation, it was identified that the radiation monitoring surveillance test procedure did not have guidance to compare the as-left database values to the as-found values. It was also determined that the process for tracking equipment that impacts radiation monitor operability is inadequate. Radiation Monitoring System (RMS) technicians did not identify this issue until June 22, 2021.
D. Corrective Actions
The database values for this radiation monitor were immediately corrected upon discovery of this condition and operability was restored on June 22, 2021. Personnel involved with radiation monitor testing and surveillance activities have been counseled on the expectations and process for verifying equipment status. A shift order instructing RMS technicians to verify radiation monitor and supporting equipment status with the Main Control Room personnel prior to radiation monitor database reviews has been issued. A standing order instructing maintenance technicians to compare as-found radiation monitor database values to as-left values for flow monitors prior to radiation monitor restoration activities has also been issued. The surveillance test procedure will be revised to incorporate guidance to compare the as-left database values to the as-found values. An improved process for tracking equipment that impacts radiation monitor operability will be implemented. The shift order and standing order will remain in effect until the improved process is implemented.
E. Safety Analysis
There were no actual consequences due to this condition prohibited by TS. The WPB Vent Stack 5A High Range Noble Gas Radiation Monitor provides a monitoring function only and does not initiate any specific control actions or provide an actuation signal for other components. This monitor does not perform a specific function in mitigating the consequences of an accident. Alternate means of monitoring conditions in the WPB were available and implemented by the operators for the duration of this condition. This condition had no impact on the health and safety of the public.
F. Additional Information
There have been no events similar to the event documented in this LER in the past three years.
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