ML17101A364

Part 21 - Circuit Breaker Defect Discovered During Current Injection Testing

ML17101A364
Person / Time
Site:	Palo Verde
Issue date:	04/07/2017
From:	Heckman D Arizona Public Service Co
To:	Rotton J Office of Nuclear Reactor Regulation
References
52670
Download: ML17101A364 (4)

Text

0410712017 U.S. Nuclear Regulatory Commission Operations Center Event Report Pagel Power Reactor Event# 52670 Site: PALO VERDE Notification Date I Time: 04/07/2017 14:49 (EDT)

Unit: 1 2 3 Region: 4 State: AZ Event Date I Time: 04/05/2017 (MST)

Reactor Type: [1] CE,[2] CE,[3] CE Last Modification: 04/07/2017 Containment Type: DRY AMB DRYAMB DRYAMB NRC Notified by: DAVID HECKMAN Notifications: MICHAEL VASQUEZ R4DO HQ Ops Officer: JEFF ROTTON PART 21/50.55 REACTOR EMAIL Emergency Class: NON EMERGENCY 10 CFR Section:

21.21 (d)(3)(i) DEFECTS AND NONCOMPLIANCE Unit Scram Code RX Grit lnit Power Initial RX Mode Curr Power Current RX Mode 1 N Yes 100 Power Operation 100 Power Operation 2 N Yes 100 Power Operation 100 Power Operation 3 N Yes 100 Power Operation 100 Power Operation

. PART 21 - CIRCUIT BREAKER DEFECT DISCOVERED DURING CURRENT INJECTION TESTING "On April 5, 2017, Arizona Public Service Company (APS) completed an evaluation of a deviation, and concluded the condition represented a defect under 10 CFR 21. APS previously submitted an interim. report (ADAMS

. Accession Number ML16344A118) for this condition pursuant to 10 CFR 21.21 (a)(2).

"A GE-Hitachi Type AKR-2BE-50, 2000 Amp circuit breaker (1,1sed to connect Class 1E batteries to the related Class 1E 125 VDC busses) exhibited arcing and smoking during current injection testing performed to test the overcurrent trip setpoint prior to, installation. Arcing occurred at one of two hex bolts anchoring the protective trip device to the line side bus. The electrical arcing resulted from inadequate tightening of both hex bolts which caused a loose electrical connection on the bus within the breaker.

"APS concluded this condition could result in the breaker failing to perform its safety function and thus could create a substantial safety hazard. The breaker had been refurbished by GE-Hitachi and was received by APS and tested on October 13, 2016. Following the test failure, the damaged bolt was replaced, both pelts were tightened, and the breaker was retested and installed.

"Pre-installation inspection and testing that includes current injection testing, recommended in GEH document

• GEK-64459, should, and did, detect faults such as the condition identified in this notification. GE-Hitachi entered this failure into their corrective action program.

"Vendor: GE HITACHI NUCLEAR ENERGY, 3901 CASTLE HAYNE RD., \11/ILMINGTON, NC 28402-2819 "Device: Breaker Model AKR-2BE-50, 2000 Amp, Serial No. NS.682600001

0410712017 U.S. Nuclear Regulatory Commission Operations Center Event Report Page2 "The NRC Resident Inspector has been informed."

From: David.Heckman@aps.com To: Hoc. HOO x

Subject:

[External_Sender] RE: ENS call reporting Part 21 Defect Date: Friday, April 07, 2017 2:47:05 PM Attachments: Final Scanned.pdf ATIACHED is the Form 361 worksheet.

From: Heckman, David J Sent: Friday, April 07, 2017 11:46 AM To: 'hoo.hoc@nrc.gov'

Subject:

ENS call reporting Part 21 Defect Good afternoon, I will be placing a call within the next 15 minutes. It is currently 11:44 MST. Attached is the Form 361 worksheet.

David Heckman Palo Verde Nuclear Generating Station Regulatory Affairs

PAGE 1 OF2 NRC FORM361 U.S. NUCLEAR REGULATORY COMMISSION (12-2000) REACTOR PLANT OPERATIONS CENTER EVENT NOTIFICATION WORKSHEET EN#

N.RC OPERATION TELEPHONE NUMBER: PRIMARY -- 301-816-5100 or 800-532-3469*, BACK UPS-- [1st] 301-951-0550 or 800-449-3694*,

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

NOTIFICATION TIME FACILITY OR ORGANIZATION UNIT NAME OF CALLER CALLBACK#

ET Palo Verde Nuclear Generating Station 1, 2, 3 David Heckman (623) 393-5932 MST EVENT TIME & ZONE EVENT DATE POWER/MODE BEFORE POWER/MODE AFTER n/a MST n/a n/a I n/a n/a I n/a.

EVENT CLASSIFICATIONS 1-Hr. Non-Emeraencv 10 CFR 50.721b}(1) I (v)(A) Safe SID Capability AINA 0 GENERAL EMERGENCY GEN/AAEC ] TS Deviation ADEV 0 (v)(B) AHR Capability AINB 0 SITE AREA EMERGENCY SITIAAEC 4-Hr. Non-Emeraencv 10 CFR 50.72Cbll2l I (v)(C) Control of Rad Release AINC D ALERT ALEIAAEC J (i) TS Required SID ASHU D (v}(D} Accident Mitigation AIND 0 UNUSUAL EVENT UNU/AAEC  :::J (iv}(A} ECCS Discharge to RCS ACCS 0 (xii} Offsite Medical AMED 0 50.72 NON-EMERGENCY (see next columns) ] (iv}(B} RPS Actuation (scram} ARPS D (xiii} Loss Comm/AsmVResp ACOM 0 PHYSICAL SECURITY (73.71) DODD n (xi} Offsite Notification APRE 60-Dav Optional 10 CFR 50.73(a)(1) 0 MATERIAUEXPOSURE B??? 8-Hr. Non-Emergencv 10 CFR 50.721bl(3} I Invalid Specilied System Act AINV n FITNESS FOR DUTY HFIT tJ (ii}(A) Degraded Condi.lion ADEG Other Unspecified Reaulrement (Identify) 181 OTHER UNSPECIFIED REQMT (see last column} D (ii}(B} Unanalyzed Condition AUNA 181 10 CFR 21.21 (d)(3}(i} NONA 0 INFORMATION ONLY NNF D (iv)(A) Specified System Actuation AESF 0 NONA DESCRIPTION Include: Systems affected, actuations and their initiating signals, causes, effect on plant, actions taken or planned, etc. (Continue on back)

On April 5, 2017, Arizona Public Service Company (APS) completed an evaluation of a deviation, and concluded the condition represented a defect under 10 CFR 21. APS previously submitted an interim report [ADAMS Accession Number ML16344A118] for this condition pursuant to 10 CFR 21.21 (a)(2).

A GE-Hitachi Type AKR-2BE-50, 2000 Amp circuit breaker (used to connect Class 1E batteries to the related Class 1E 125 VDC busses) exhibited arcing and smoking during current injection testing performed to test the overcurrent trip setpoint prior to installation. Arcing occurred at one of two hex bolts anchoring the protective trip device to the line side bus. The electrical arcing resulted from inadequate tightening of both hex bolts which caused a loose electrical connection on the bus within the breaker.

APS concluded this condition could result in the breaker failing to perform its safety function and thus could create a

~ubstantial safety hazard. The breaker had been refurbished by GE-Hitachi and was received by APS and tested on October 13, 2016. Following the test failure, the damaged bolt was replaced, both bolts were tightened, and the breaker was retested and installed.

Pre-installation inspection and testing that includes current injection testing, recommended in GEH document GEK-64459, should, and did, detect faults such as the condition identified in this notification. GE-Hitachi entered this failure into their corrective action program.

The NRC resident inspector has been informed.

Vendor: GE HITACHI NUCLEAR ENERGY Device: Breaker Model AKR-2BE-50,2000 Amp 3901 CASTLE HAYNE RD Serial No N8682600001 WILMINGTON, NC 28402-2819 NOTIFICATIONS YES NO WILL BE ANYTHING UNUSUAL OR D YES (explain above) )r NO NRC RESIDENT

-STATE(s) l8l El 0

l8l D

D NOT UNDERSTOOD?

DID ALL SYSTEMS FUNCTION

~ D AS REQUIRED? D YES D NO (explain above)

D LOCAL OTHER GOV AGENCIES 0 ~ 0 MODE OF OPERATION UNTIL CORRECTED:

IESTIMATE FOR RESTART DATE:

I ADDITIONAL INFO ON BACK MEDIA/PRESS RELEASE D 181 D . 0YF.S ONO

~me FORM 351 (12-?-000)