ML17026A413

Part 21 - Failure of Power Supplies to Meet Voltage Stability Specifications

ML17026A413
Person / Time
Site:	FitzPatrick
Issue date:	01/11/2017
From:	Mark Hawes Entergy Nuclear Operations
To:	Office of Nuclear Reactor Regulation
References
52480
Download: ML17026A413 (2)

Text

0111112017 . U.S. Nuclear Regulatory Commission Operations Center Event Report Pagel Power Reactor Event# 52480 Site: FITZPATRICK Notification Date I Time: 01/10/2017 22:45 (EST)

Unit: 1 Region: 1 State: NY Event Date I Time: 11/10/2016 16:04 (EST)

Reactor Type: [1] GE-4 Last Modification: 01/10/2017 Containment Type: MARK I NRC Notified by: MARK HAW.ES Notifications: ANTHONY DIMITRIADIS R1DO HQ Ops Officer: DONALD NORWOOD PART 21/50.55 REACTOREMAIL Emergency Class: NON EMERGENCY 10 CFR Section:

21.21(a)(2) INTERIM EVAL OF DEVIATION Unit Scram Code RX Crit lnit Power Initial RX Mode Curr Power Current RX Mode 1 N Yes 67 Power Operation 67 Power Operation PART 21 - FAILURE OF POWER SUPPLIES TO MEET VOLTAGE STABILITY SPECIFICATIONS "This notification is a 10 CFR 21.21 (a)(2) interim report for power supply model N-2ARPS-A6. Two instrument power supplies for the 'B' Residual Heat Removal (RHR) system were being bench tested prior to installation when it was discovered that they failed to meet Vendor Technical Manual specifications for voltage stability for varying loads. The deviation was a voltage drop of approximately 300mV. This did not meet the specification of less than 150mV when varying current from 5 amps (full load) to 2.5 amps. A second replacement power supply exhibited a similar 300 mV drop.

"James A. FitzPatrick (JAF) reviewed the work order instructions to determine if there was a deviation from the recommendations in the Foxboro technical manual F180-0309 Spec 200 Multinest Power Supply 2ARPS Series calibration. Since as-found voltage readings were within the required tolerance of the RHR instrument loops, the power supplies appear to have been capable to perform their intended function. However, this evaluation did not troubleshoot why the power supplies failed to meet the calibration requirements.*

"The power supplies were sent to a repair vendor. The input from this vendor is expected to allow JAF to complete the evaluation per 10 CFR 21.21 (a)(1) by March 21, 2017, and a notification for failure to comply or defect per 10 CFR 21.21(d)(3)(i) is expected by March 24, 2017, if necessary. This notification is being submitted as an interim report per 10 CFR 21.21 (a)(2)."

The licensee notified the NRC Resident Inspector.

NRC FORM 361 U.S. NUCLEAR REGULATORY COMMISSION (12-2000) OPERATIONS CENTER REACTOR PLANT EVENT NOTIFICATION WORKSHEET EN# 52480 NRC OPERATION TELEPHONE NUMBER: PRIMARY -- 301-816-5100 or 800-532-3469*, BACKUPS -- [1st] 301-951-0550 or 800-449-3694*,

[2nd] 301-415-0550 and [3rd] 301-415-0553 *Licensees who maintain their own ETS are orovided these telephone numbers.

NOTIFICATION TIME FACILITY OR ORGANIZATION UNIT NAME OF CALLER CALL BACK#

2245 EST James A. FitzPatrick 1 Mark Hawes (315) 349-6664 EVENT TIME & ZONE EVENT DATE POWER/MODE BEFORE POWER/MODE AFTER 16:04 ET 11/10/2016 67% I Mode 1 67% I Mode 1 EVENT CLASSIFICATIONS 1-Hr. Non-Emergency 10 CFR 50.72(b)(1) D (v)(A) Safe S/D Capability AINA D GENERAL EMERGENCY GEN/AAEC D TS Deviation ADEV D (v)(B) RHR Capability AINB D SITE AREA EMERGENCY SIT/AAEC 4-Hr. Non-Emeraencv 10 CFR 50.72CblC2l D (v)(C) Control of Rad Release AINC D ALERT ALE/AAEC D (i) TS Required S/D ASHU D (v)(D) Accident Mitigation AIND D UNUSUAL EVENT UNU/AAEC D (iv)(A) ECCS Discharge to RCS ACCS D (xii) Offsite Medical AMED D 50.72 NON-EMERGENCY (see next columns) D (iv)(B) RPS.Actuation (scram) ARPS D (xiii) Loss Comm/Asmt/Resp ACOM D PHYSICAL SECURITY (73.71) DDDD D (xi) Offsite Notification APRE 60-Day Optional 10 CFR 50.73(a)(1)

D MATERIAL/EXPOSURE B??? 8-Hr. Non-Emeraencv 10 CFR 50.72Cb)(3) D Invalid Specified System Actuation AINV D FITNESS FOR DUTY HFIT D (ii)(A) Degraded Condition ADEG Other Unspecified Requirement (Identify) 0 OTHER UNSPECIFIED REQMT. (see last column) D (ii)(B) Unanalyzed Condition AUNA 1ZJ 10CFR21.21(a)(2) NONR D INFORMATION ONLY NINF D (iv)(A) Specified System Actuation AESF D NONR DESCRIPTION Include: Systems affected, actuations and their initiating signals, causes, effect of event on plant, actions taken or planned, etc. (Continue on back)

This notification is a 10 CFR 21.21 (a)(2) interim report for power supply model N-2ARPS-A6. Two instrument power supplies for the "B" Residual Heat Removal (RHR) system were being bench tested prior to installation when it was discovered that they failed to meet Vendor Technical Manual specifications for voltage stability for varying loads. The deviation was a voltage drop of approximately 300mV. This did not meet the specification of <150mV when varying current from 5 amps (full load) to 2.5 amps.

A second replacement power supply exhibited a similar 300 mV drop.

James A. FitzPatrick (JAF) reviewed the work order instructions to determine if there was a deviation from the recommendations in the Foxboro technical manual F180-0309 Spec 200 Multinest Power Supply 2ARPS Series calibration. Since as-found voltage readings were within the required tolerance of the RHR instrument loops, the power supplies appear to have been capable to perform their intended function. However, this evaluation did not troubleshoot why the power supplies failed to meet the calibration requirements.

The power supplies were sent to a repair vendor. The input from this vendor is expected to allow JAF to complete the evaluation per 10 CFR 21.21 (a)(1) by March 21, 2017, and a notification for failure to comply or defect per 10 CFR 21.21 (d)(3)(i) is expected by March 24, 2017, if necessary. This notification is being submitted as an interim report per 10 CFR 21.21 (a)(2).

NOTIFICATIONS YES NO WILL BE ANYTHING UNUSUAL OR NOT UNDERSTOOD?

D YES (Explain above) [{]NO NRC RESIDENT 0 D D STATE(s) D 0 D DID ALL SYSTEMS

[{]YES D NO (Explain above)

LOCAL OTHER GOV AGENCIES D

D 0

0 D

D FUNCTION AS REQUIRED?

MODE OF OPERATION UNTIL CORRECTED:

IESTIMATED RESTART DATE:

I ADDITIONAL INFO ON BACK 0

MEDIA/PRESS RELEASE D 0 D (MM/DD/YYYY) DYES NO NRG FORM 361 (12-2000) PAGE 1 OF 2