05000440/LER-2020-001, Combustible Gas Mixing Compressor Was Declared Inoperable Due to Degraded Thermal Overloads Resulting in Technical Specification Violation
| ML20107F741 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 04/09/2020 |
| From: | Payne F Energy Harbor Nuclear Corp |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-20-055 LER 2020-001-00 | |
| Download: ML20107F741 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2) 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(i) |
| 4402020001R00 - NRC Website | |
text
energy harbor Energy Harbor Nuclear Corp Perry Nuclear Power Plant 10 Center Road P.O. Box 97 Perry, Ohio 44081 Frank R. Payne Site Vice President, Perry Nuclear April 9, 2020 L-20-055 440-280-5382 440-392-4723 (cell) 10CFR50.73(a)(2)(i)(B) 10CFR50.73(a)(2)(v)(C)
ATTN:
Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001
SUBJECT:
Perry Nuclear Power Plant Docket No. 50-440, License No. NPF-58 Licensee Event Report Submittal Enclosed is Licensee Event Report (LER) 2020-001, "Combustible Gas Mixing Compressor was declared Inoperable due to Degraded Thermal Overloads resulting in Technical Specification Violation".
There are no regulatory commitments contained in this submittal.
If there are any questions or if additional information is required, please contact Mr. Glendon Burnham, Manager-Regulatory Compliance, at (440) 280-7538.
Sincerely, Frank R. Payne
Enclosure:
LER 2020-001 cc:
NRC Project Manager NRC Resident Inspector NRC Region III Regional Administrator
Enclosure L-20-055 LER 2020-001
NRC FORM 366 (04-2020)
U.S. NUCLEAR REGULATORY COMMISSION LICENSE^EVENT REPORT (LER)
(See Page 2 for required number of digits/characters for each block)
(See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.aov/readinq-rm/doc-collections/nureas/staff/sr1022/r3A APPROVED BY OMB: NO. 3150-0104 EXPIRES: 04/30/2020
- 1. Facility Name Perry Nuclear Power Plant
- 2. Docket Number 05000-440
- 3. Page 1
OF 3
- 4. Title Combustible Gas Mixing Compressor Inoperability resulting in a Technical Specification Violation
- 5. Event Date
- 6. LER Number
- 7. Report Date
- 8. Other Facilities Involved Month Day Year Year Sequential Number Rev No.
Month Day Year Facility Name Docket Number 05000 03 06 2020 2020-001-00 05 04 Facility Name 2020 Docket Number 05000
- 9. Operating Mode
- 11. This Report is Submitted Pursuant to the Requirements of 10 CFR §: (Check all that apply) 20.2201 (b) 20.2201 (d) 20.2203(a)(1) 20.2203(a)(2)(i) 20.2203(a)(3)(i) 20.2203(a)(3)(ii) 20.2203(a)(4) 50.36(c)(1)(i)(A) 50.73(a)(2)(ii)(A) 50.73(a)(2)(ii)(B) 50.73(a)(2)(iii) 50.73(a)(2)(iv)(A) 50.73(a)(2)(viij)(A) 50.73(a)(2)(viii)(B) 50.73(a)(2)(ix)(A) 50.73(a)(2)(x)
- 10. Power Level 20.2203(a)(2)(ii) 50.36(c)(1)(ii)(A) 50.73(a)(2)(v)(A) 73.71 (a)(4) 20.2203(a)(2)(iii) 50.36(c)(2) 50.7.3(a)(2)(v)(B) 73.71 (a)(5) 20.2203(a)(2)(iv) 50.46(a)(3)(ii) 50.73(a)(2)(v)(C) 100 73.77(a)(1) 20.2203(a)(2)(v) 50.73(a)(2)(i)(A) 50.73(a)(2)(v)(D) 73.77(a)(2)(i) 20.2203(a)(2)(vi) 50.73(a)(2)(i)(B) 50.73(a)(2)(vii) 73.77(a)(2)(ii) 50.73(a)(2)(i)(C)
Other (Specify in Abstract below or in
CAUSE
The direct cause was determined to be a degraded overload relay. The apparent cause was determined to be inadequate procedural guidance for testing the overload relay.
EVENT ANALYSIS
A Probabilistic Risk Assessment (PRA) evaluation was performed for the November 1, 2019 to February 14, 2020 Combustible Gas Mixing Compressor B Inoperability event. The Combustible Gas Control System is not modeled in the PRA.
The Combustible Gas Control System's function is to protect the Containment vessel following a core damage event.
As such, inoperability of the Mixing Compressor B would have no effect on core damage frequency.
The Combustible Gas Mixing Compressors, Hydrogen Recombiners, and Hydrogen Igniters, are used to control hydrogen while the hydrogen concentration is below the Hydrogen Deflagration Overpressure Limit in the Containment and Drywell.
If the hydrogen concentration is above the Hydrogen Deflagration Overpressure Limit, then Containment Spray and Containment Venting are utilized to reduce Containment hydrogen concentrations. As the Hydrogen Ignition System, the Hydrogen Recombiners, Containment Spray, and Containment Venting were not compromised by this event and provide defense-in-depth for mitigation of hydrogen and combustible gas accumulation in the Containment, this demonstrates that the risk impact of the Combustible Gas Mixing Compressor B Inoperability is very small.
CORRECTIVE ACTIONS
The procedure was revised for clarification of testing this type of overload relay.
PREVIOUS SIMILAR EVENTS
None
COMMITMENTS
None
- C FORM 366A (04-2020)