05000333/LER-2020-003, High Pressure Coolant Injection Inoperable Due to Oil Leak
| ML20161A405 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 06/09/2020 |
| From: | Pat Navin Exelon Generation Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| JAFP-20-0042 LER 2020-003-00 | |
| Download: ML20161A405 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 3332020003R00 - NRC Website | |
text
Exelon Generation JAFP-20-0042 June 9, 2020 United States Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001 James A. FltzPatrick NPP P.O. Box 110 Lycoming. NY 13093 Tel 315*349-6024 Fax 315-349-6480 Patrick D. Navin Site Vice President-JAF James A. FitzPatrick Nuclear Power Plant Renewed Facility Operating License No. DPR-059 NRC Docket No. 50-333
Subject:
Dear Sir or Madam:
LER: 2020-003, High Pressure Coolant Injection Inoperable due to Oil Leak This report is being submitted pursuant to 50. 73(a)(2)(v)(D).
There are no new regulatory commitments contained in this report.
Questions concerning this report may be addressed to Mr. Richard Sullivan, Regulatory Assurance Manager, at (315) 349-6562.
SincerelA PatrickD. ;yJ Site Vice President PDN/RS/hm
Enclosure:
LER: 2020-003, High Pressure Coolant Injection Inoperable due to Oil Leak cc:
USNRC, Region I Administrator USNRC, Project Manager USNRC, Resident Inspector INPO Records Center (IRIS)
NRC FORM 366 (04-2020)
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (04-2020)
LICENSEE EVENT REPORT (LER)
APPROVED BY OMB: NO. 3150-0104 EXPIRES: 04/30/2020
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 1. Facility Name James A. FitzPatrick Nuclear Power Plant
- 2. Docket Number 05000333
- 3. Page 1 OF 3
- 4. Title High Pressure Coolant Injection Inoperable due to Oil Leak
- 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 N/A Docket Number N/A 04 10 2020 2020 - 003 - 00 06 09 2020 Facility Name N/A Docket Number N/A
- 9. Operating Mode Month Day Year Yes (If yes, complete 15. Expected Submission date) No Abstract (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)
On April 10, 2020 at 0300, an oil leak from 23PCV-12, HPCI Trip System Pressure Control Valve (PCV) resulted in the system being declared inoperable. This condition is being reported as a condition that could have prevented the fulfillment of the safety function of a system needed to mitigate the consequences of an accident per 10CFR50.73(a)(2)(v)(D).
Corrective action to replace valve 23PCV-12 was completed and system was restored to service at time 2015 on April 10, 2020.
(See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1022/r3/)
(See Page 2 for required number of digits/characters for each block)
=
Background===
The High Pressure Coolant Injection (HPCI) System [EIIS Identifier: BJ] is part of the Emergency Core Cooling System (ECCS); HPCI provides and maintains an adequate coolant inventory inside the Reactor Pressure Vessel [RPV] to prevent damage to the reactor core under postulated accident scenarios. The system is comprised of various components which include a turbine, pumps, valves, piping, and instrumentation. The HPCI System may be initiated by automatic or manual means.
The HPCI turbine oil system provides for lubrication and cooling of the equipment bearings and other accessories. The oil system also provides control and hydraulic oil to the turbine governor system. Loss of oil pressure to the turbine governor system will cause the steam supply stop valve and turbine control valve to go shut, securing steam to the turbine. The HPCI oil system is not normally pressurized, the system is only pressurized during operational checks of the system and during actual system operation.
Event Description
While conducting a HPCI monthly operability test (ST-4B), a control oil leak was observed from 23PCV-12.
The oil leak is only visible when the oil system is pressurized. Initial leakage rate was estimated at approximately 0.1 gallons per minute, which would still allow HPCI system to meet mission time. To confirm leak location and validate leak rate, the auxiliary oil pump was restarted. With system oil pressure reestablished, the leak rate was determined to have degraded such that the capability of the HPCI system to meet mission time would be challenged.
Event Analysis
Level in the HPCI Oil Tank provides net positive suction head (NPSH) to the suctions of the oil pumps for the duration of HPCI mission time. Loss of NPSH to the suction of HPCI Main Lube Oil Pump (23P-1MO) and the HPCI Turbine Aux. Lube Oil Pump (23P-150) will result in a loss of oil pressure to the system bearings and system control valves. Oil pressure is required for operation of the HPCI Turbine Steam Supply Stop Valve (23HOV-1) and HPCI Turbine Control Valve (23HOV-2). Loss of bearing cooling and oil pressure for the stop and control valves would have limited HPCI operation.
The elevated leak rate would challenge the capability of the HPCI system in meeting mission time.
Cause
The cause was determined to be a tear in the 23PCV-12 control valve diaphragm, allowing a loss of control oil from the system.
Similar Events
Previous LER: None identified.
FAILED COMPONENT IDENTIFICATION:
Manufacturer:
Robertshaw Manufacturer Model Number:
VC-210 NPRDS Manufacturer Code:
R290 NPRDS Component Code:
PCV FitzPatrick Component ID:
23PCV-12U.S. NUCLEAR REGULATORY COMMISSION (04-2020)
LICENSEE EVENT REPORT (LER)
CONTINUATION SHEET APPROVED BY OMB: NO. 3150-0104 EXPIRES: 04/30/2020
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. LER NUMBER James A. FitzPatrick Nuclear Power Plant 05000 - 333 YEAR SEQUENTIAL NUMBER REV N0.
2020
- - 003
- - 00 Page 3 of 3 (See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1022/r3/)
Completed Corrective Actions
Valve 23PCV-12 was replaced. Additional corrective actions are documented in the Corrective Action Program.
Safety Significance
Nuclear Safety - The failure of the HPCI turbine over-speed reset control valve diaphragm would result in a loss of HPCI turbine lubricating oil and control oil during HPIC oil system operation. Depending on the amount of oil lost and system demands, the leakage may have prevented the HPCI from meeting system specified mission time.
Industrial safety - No actual or potential industrial safety consequences resulted from this event.
Radiological safety - No actual radiological impact is associated with this event.
References Issue Report - IR 04334315, HPCI Oil Leak, dated April 10, 2020 ENS 54657, issued 4/10/2020