05000458/LER-2023-003, Drywell Atmosphere Radiation Monitor Particulate and Gaseous Channels Inoperable Due to Out of Tolerance Conversion Factors
| ML23257A257 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 09/14/2023 |
| From: | Crawford R Entergy Operations |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| RBG-48255 LER 2023-003-00 | |
| Download: ML23257A257 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 4582023003R00 - NRC Website | |
text
- ) entergy RBG-48255 Randy Crawford Manager Regulatory Assurance 225-381-4177 10 CFR 50.73 September 14, 2023 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
Subject:
Licensee Event Report 50-458 / 2023-003-00, Drywell Atmosphere Radiation Monitor Particulate and Gaseous Channels Inoperable due to Out of Tolerance Conversion Factors River Bend Station - Unit 1 NRC Docket Nos. 50-458 Renewed Facility Operating License No. NPF-47 In accordance with 1 O CFR 50.73, enclosed is the subject Licensee Event Report.
This document contains no commitments.
Should you have any questions, please contact Mr. Randy Crawford, Regulatory Assurance Manager, at 225-381-4177.
Respectfully,
re..------
Randy Crawford RC/tf
Enclosure:
cc:
Licensee Event Report 50-458 / 2023-003-00, Drywell Atmosphere Radiation Monitor Particulate and Gaseous Channels Inoperable due to Out of Tolerance Conversion Factors NRC Region IV Regional Administrator - Region IV NRC Senior Resident Inspector - River Bend Station Entergy Operations, Inc., 5485 U.S. Highway 61 N. St. Francisville, LA 70775
Enclosure RBG-48255 Licensee Event Report 50-458 / 2023-003-00, Drywell Atmosphere Radiation Monitor Particulate and Gaseous Channels Inoperable due to Out of Tolerance Conversion Factors
Abstract
On August 29, 2023, with River Bend Station (RBS) operating at 100% power, personnel recognized that the Drywell Atmosphere Radiation Monitor (RMS-RE112) particulate and gaseous channel conversion factors were out of tolerance.
The monitor was declared inoperable and the appropriate Technical Specification (TS) Condition was entered.
Preliminary investigation has determined that the out of tolerance conversion factors are due to inadequate or incomplete written procedures. A causal evaluation has not been completed at this time. The results of the causal evaluation will be included in a supplement to this report.
The RMS-RE112 conversion factors have been corrected and the monitor was declared operable on September 7, 2023.
This condition is being reported as an Operation or Condition Prohibited by Technical Specifications per 1 O CFR
- 50. 73( a)(2)(i)(B).
EVENT DESCRIPTION
- 2. DOCKET NUMBER
- 3. LER NA'SER YEAR SEQUENTIAL REV NUMBER NO.
458 2023
- - 003
- - 00 On August 29, 2023, River Bend Station (RBS) personnel recognized that the Drywell Atmosphere Radiation Monitor (RMS-RE112) [IL] [MON] particulate and gaseous channel conversion factors were out of tolerance. The monitor was declared inoperable and Technical Specification (TS) Limiting Condition of Operation 3.4.7, Reactor Coolant System Leakage Detection Instrumentation, Condition B was entered. The RMS-RE112 conversion factors were corrected, and the monitor was declared operable on September 7, 2023.
The discrepancy was identified as part of an extent of condition review performed due to the Notice of Violation (ML23201A132) issued to RBS on August 15, 2023, for failing to maintain reliable and accurate indications on five effluent radiation monitors.
On July 17, 2023, a condition report was initiated requesting a work order to review and validate the RMS-RE112 conversion factors. On August 29, 2023, RBS personnel recognized that information had been available to determine that the conversion factors were out of tolerance since the condition report was initiated on July 17. Therefore, the date of discovery is July 17, 2023.
The conversion factors have been out of tolerance for the life of the plant. Therefore, this event is being reported as an Operation or Condition Prohibited by Technical Specifications per 1 O CFR 50.73(a)(2)(i)(B).
EVENT CAUSE
Preliminary investigation has determined that the out of tolerance conversion factors are due to inadequate or incomplete written procedures. A causal evaluation has not been completed at this time. The results of the causal evaluation will be included in a supplement to this report.
SAFETY ASSESSMENT
Limits on leakage from the Reactor Coolant Pressure Boundary (RCPB) are required so that appropriate action can be taken before the integrity of the RCPB is impaired. Leakage detection systems for the Reactor Coolant System (RCS) are provided to alert operators when leakage rates above normal background levels are detected and to supply quantitative measurement of rates. RMS-RE112 comprises one of three RCS leakage detection instrumentation systems required by RBS TS 3.4.7. At least one of the two remaining RCS leakage detection instrumentation systems of TS 3.4.7 remained operable during the 3-year LER past operability period.
RMS-RE112 is not used to recognize and properly classify emergency conditions and is not classified as Equipment Important to Emergency Response (EITER).
This event was of minimal significance to the health and safety of the public.
CORRECTIVE ACTIONS
The RMS-RE112 conversion factors were corrected and the monitor was declared operable on September 7, 2023.
The causal evaluation for the out of tolerance conversion factors is still in progress. The results of the causal evaluation will be included in a supplement to this report.
PREVIOUS SIMILAR OCCURRENCES No previous similar occurrences identified.
- 2. DOCKET NUMBER 3.LERIIU,'SER YEAR SEQUENTIAL REV NUMBER NO.
458 2023
- - 003
- - 00 Energy Industry Identification System (EIIS) codes are identified in the text as [XX]. River Bend equipment codes are identified as (XX). Page _3_ of _3_