05000220/LER-2020-001, Control Room Air Treatment System Inoperable
| ML20192A074 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 07/02/2020 |
| From: | Sterio A Exelon Generation Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NMP1L3345 LER 2020-001-00 | |
| Download: ML20192A074 (7) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 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)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 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)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(i) |
| 2202020001R00 - NRC Website | |
text
Exelon Generation" NMP1L3345 July 2, 2020 U. S. Nuclear Regulatory Commission A TIN: Document Control Desk Washington, DC 20555-0001 Nine Mile Point Nuclear Station, Unit 1 Renewed Facility Operating License No. DPR-63 Docket No. 50-220 10 CFR 50.73
Subject:
NMP1 Licensee Event Report 2020-001, Control Room Air Treatment System Inoperable In accordance with the reporting requirements contained in 1 O CFR 50.73(a)(2)(v)(D), please find enclosed NMP1 Licensee Event Report (LEA) 2020-001, Control Room Air Treatment System Inoperable.
There are no regulatory commitments contained in this letter.
Should you have any questions regarding the information in this submittal, please contact Brandon Shultz, Site Regulatory Assurance Manager, at (315) 349-7012.
Respectfully,
~c.JL, 0 ~
Alexander D. Sterio Acting Plant Manager, Nine Mile Point Nuclear Station Exelon Generation Company, LLC ADS/OW
Enclosure:
NMP1 Licensee Event Report 2020-001, Control Room Air Treatment System Inoperable cc:
NRG Regional Administrator, Region I NRG Resident Inspector NRC Project Manager
Enclosure NMP1 Licensee Event 2020-001 Control Room Air Treatment System Inoperable Nine Mile Point Nuclear Station, Unit 1 Renewed Facility Operating License No. DPR-63
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY 0MB: NO. 3150*0104 EXPIRES: 03/31/2020 (04*2020)
Estimated burden per response to comply with this mandatory collection request 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />.
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Reported lessons learned are incorporated into the licensing process and fed back to industry.
a i LICENSEE EVENT REPORT (LEA)
Send comments regarding burden estimate to the Information Collections Branch (T-5 F53), U.S.
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Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to
- .r (See Page 2 for required number of digits/characters for each block) lnfocollects.Resource@nrc.gov, and to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-10202, (3150-0104), Office of Management and Budget, Washington, DC 20503. If (See NUREG-1022, R.3 for instruction and guidance for completing this form a means used to impose an inlormation collection does not display a currently valid 0MB control hlllr/lwww.nr~.gov/readiog-rm[doc-collectionslnuregslsl!;!fflsr1022/r3l) number, the NRG may not conduct or sponsor, and a person is not required to respond lo, the information collection.
- 3. PAGE Nine Mile Point Unit 1 05000220 1 OF 5
- 4. TITLE Control Room Air Treatment System Inoperable
- 5. EVENT DATE
- 6. LEA NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED YEAR I SEQUENTIAL I REV FACILITY NAME DOCKET NUMBER MONTH DAY YEAR NUMBER NO.
MONTH DAY YEAR N/A NIA FACILITY NAME DOCKET NUMBER 05 03 2020 2020 - 001
- - 00 07 02 2020 N/A NIA
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Checkallthatappfy) 0 20.2201 (b)
D 20.2203(a)(3)(i) 0 50.73(a)(2)(ii)(A) 0 50.73(a)(2)(viii)(A) 0 20.2201(d)
D 20.2203(a)(3)(ii) 0 50.73(a)(2)(ii)(B)
D 50.73(a)(2)(viii)(B) 1 D 20.2203(a)(1)
D 20.2203(a)(4)
D 50.73(a)(2)(iii)
D 50.73(a)(2)(ix)(A)
D 20.2203(a)(2)(i) 0 50.36(c)(1 )(i)(A)
D 50.73(a)(2)(iv)(A)
D 50.73(a)(2)(x) 1 D. POWER LEVEL D 20.2203(a)(2)(ii) 0 50.36(c)(1 )(ii)(A)
D 50.73(a)(2)(v)(A)
D 73.71(a)(4)
D 20.2203(a)(2)(iii)
D 50.36(c)(2)
D 50.73(a)(2)(v)(B)
D 73.71(a)(5)
D 20.2203(a)(2)(iv)
D 50.46(a)(3)(ii)
D 50.73(a)(2)(v)(C)
D 73.77(a)(1) 100 D 20.2203(a)(2)(v) 0 50.73(a)(2)(i)(A)
~ 50.73(a)(2)(v)(D)
D 73.77(a)(2)(i)
D 20.2203(a)(2)(vi) 0 50.73(a)(2)(i)(B)
D 50.73(a)(2)(vii) 0 73.77(a)(2)(ii) 0 50.73(a)(2)(i)(C) 0 OTHER Specify in Abstract below or in C. INOPERABLE STRUCTURES. COMPONENTS. OR SYSTEMS THAT CONTRIBUTED TO THE EVENT:
No other systems, structures, or components contributed to this event.
D. DA TES AND APPROXIMATE TIMES OF MAJOR OCCURRENCES AND OPERATOR ACTIONS:
The dates, times, and major occurrences and operator actions for this event are as follows.
May 3, 2020 at 11 :00 - Step change heard in control room noise level above the ceiling.
Sound appears to be coming from the ventilation area.
May 3, 2020 at 11: 11 - Field operator reports higher than normal noise and vibration from the Control Room Ventilation ductwork and concurs that the noise is from the Control Room Ventilation Circulation Fan.
May 3, 2020 at 11: 15 - Operator attempts to swap from #11 motor to #12 but noise continues.
May 3, 2020 at 11: 18 - Operator secures #12 fan motor to prevent possible further degradation and enters the Technical Specification 3.4.5.e 7-day Action Statement.
May 3, 2020 at 11 :34 - Control Room Ventilation is secured. Alternate Control Room Ventilation is placed in service.
May 3, 2020 at 17:20 - Declared control room envelope boundary inoperable and entered Technical Specification 3.4.5.f, 90-day action statement May 8, 2020 at 20:11 - Control Room Ventilation Air Treatment System is restored to operable and Technical Specifications 3.4.5.e and fare exited.
E. METHOD OF DISCOVERY
This event was discovered by Operations when abnormal noises were heard coming from the ventilation system.
F. SAFETY SYSTEM RESPONSES:
No operational conditions requiring the response of safety systems occurred as a result of this condition.
II. CAUSE OF EVENT
The cause of the failure for the Circulation Fan was the failure of the pillow block bearing. The bearing has been sent out for failure analysis to determine the cause of its degradation.
Results of the analysis will be provided in a supplement.
III. ANALYSIS OF THE EVENT
YEAR 2020 -
- 3. LER NUMBER SEQUENTIAL NUMBER 001 The failure of the Control Room Air Treatment System is reportable under 1 O CFR 50.73(a)(2)(v)(D) as any event or condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to: (D) Mitigate the consequences of an accident. The Control Room Ventilation System Circulation fan was inoperable for a period of time.
With the Control Room Air Treatment System out of service, the heating and cooling function to maintain personnel comfort and control instrument protection was achieved by placing and maintaining the Smoke Purge system in service.
The Control Room Air Treatment System and envelope boundary were restored to service within the time frame allowed by the Technical Specification Action Statements.
Based on the above discussion, it is concluded that the safety significance of this event is low, and the event did not pose a threat to the health and safety of the public or plant personnel.
This event does affect the NRC Regulatory Oversight Process Indicator for safety system failures.
IV. CORRECTIVE ACTIONS
A. ACTION TAKEN TO RETURN AFFECTED SYSTEMS TO PRE-EVENT NORMAL STATUS:
The #11 fan pillow block bearing, #11 motor sheave and key were replaced. The fan was tested satisfactory in accordance with post maintenance testing requirements.
B. ACTION TAKEN OR PLANNED TO PREVENT RECURRENCE:
To be provided in the supplement when the cause is completed.
V. ADDITIONAL INFORMATION
A. FAILED COMPONENTS:
FN-210-61 B. PREVIOUS LERs ON SIMILAR EVENTS:
REV NO.
00 None VEAR 2020
- SEQUENTIAL NUMBER 001 C. THE ENERGY INDUSTRY IDENTIFICATION SYSTEM (EIIS) COMPONENT FUNCTION IDENTIFIER AND SYSTEM NAME OF EACH COMPONENT OR SYSTEM REFERRED TO IN THIS LER:
COMPONENT Control Room Ventilation Circulation Fan IEEE 803 FUNCTION IDENTIFIER FAN IEEE 805 SYSTEM IDENTIFICATION VI REV NO.
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