ML19269E865

Responds to IE Bulletin 79-09 Re GE Type AK-2 Circuit Breakers.Four AK-2A-505 & Fifteen AK-2A-25 Breakers Installed in 600 Volt Emergency Power Sys.Provides Specific Functions of Breakers

ML19269E865
Person / Time
Site:	FitzPatrick
Issue date:	05/18/1979
From:	Leonard J POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
JAFP-79-247, NUDOCS 7906290743
Download: ML19269E865 (4)

Text

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%id POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITzPATRICK NUCLEAR POWER PLANT JOHN D. LEONARD, JR.

Resident Manager S

JAFP-79-247 P.O. BOX 41 Lycomins, N York 13093 315-342-384o Mr. Boyce H. Grier, Di rector United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

SUBJECT:

NRC I & E BULLETIN 79-09 FAILURES OF GE TYPE AK-2 CIRCUlT BREAKER IN SAFETY RELATED SYSTEMS ENCLOSURES (1) JAFNPP Emergency Electrical Distribution System Diagram

Dear Mr. Grier:

The following is provided as the Power Authority's response to the subject bulletin:

1. General Electric AK-2A breakers are used in safety-related systems at the James A. FitzPatrick Nuclear Power Plant. There are four AK-2A-505 and fif teen AK-2A-25 breakers installed in the 600 volt emergency power systems.

2. The specific functions of the AK-2A breakers in the 600 vol ts emergency power systems are as follows:

BUS BREAKER SERVICE 12500 12502- Supply to Bus 12500 12510 Emergency Service Water Pump (46P-2A) 12506 Supply to Mcc 252 and Mcc 254 12508 Supply to Mcc 251 and Mcc 253 11500 11502 Supply to Bus 11500 11508 Supply to Mcc 261 and Mcc 263 11506 Supply to Mcc 152 11510 Supply to Mcc 151 11516 Control Rod Drive Water Pump (03P-16A) 2142 071 7 9 0 6 29 0 793 g

Mr. Boyce H. Grier, Director May 18, 1979 United States Nuclear Regulatory Commission JAFP-79-247

SUBJECT:

NRC 1 & E BULLETIN 79-09 Page BUS BREAKER SERVICE 12600 12602 Supply to Bus 12600 12610 Emergency Service Water Pump (46P-28) 12606 Supply to MCC 261 and MCC 263 12608 Supply to MCC 262 and MCC 264 12616 Control Room Reheat Electrical Coil (70E-8) 11600 11602 Supply to Bus 11600 11606 Supply to MCC 161 11608 Supply to MCC 162 11610 Supply to MCC 163 11616 Control Rod Drive Water Pump (03P-168)

MCC - Motor Control Center Because of the quantity of equipment powered from the motor control centers (MCC), it is not practical to list all of these loads in this response.

These loads include battery chargers, reactor protection system motor generztor set, LPCI independent power supply, instrumentation, and safety-related valva motor operators. A diagram of the JAFNPP emergency electric power system is included as Enclosure (1).

The undervoltage trip device for General Electric AK-2 breakers referenced in I & E Bulletin 79-09 is not utilized in the JAF electrical distribution system. Loss of off-site power is detected by under-voltage relays installed on each 4160 vol t bus that supplies power to the 600 vol t emergency bus.

2. Preventative maintenance of General Electric AK-2 breakers is detailed in JAFNPP Preventative Maintenance Procedure EP-008. This preventative maintenance procedure covers the following areas of low vol tages breaker main-tenance:

Section 3.2 Inspection 33 Cleaning

.4 Lubrication 3.5 Contact Resis tance, Gap, Sequence, and Wipe 3.6 Insulation Resistance Testing 3.7 Operating Mechanism Adjustment 3.8 Adjustment of Breaker Trip Devices 39 Breaker Insertion and Final Testing Preventative Maintenance Procedure EP-008 is based on the General Electric installation, operation, and maintenance manuals for Type AK-2A breakers and have been updated to reflect the recommendations of GE Service Advice Letter 9 3 175 (CPDD) to the extent that they apply to the JAF installation.

2142 072

Mr. Boyce H. Grier, Director May 18, 1979 United States Nuclear Re.gulatory Commission JAFF-79-247

SUBJECT:

NRC I & E BULLETIN 79-09 Page Preventative maintenance of breakers at FitzPatrick is performed by Grade "C" electricians or higher. Grade "C" electricians and super-visory personnel in the Maintenance Department have received specific training in the maintenance of GE breakers and switchgear (including Type AK-2 breakers).

This training was provided by the General Electric Company.

3 The following schedule for preventati /e maintenance of GE Type AK-2A breakers installed ir. safety-related 600 volt electrical power systems will be adhered to:

a. EP-008, Sections 3 2, 3 3, 3.4, 3.8 and 3 9 will be performed on a once per refueling cycle basis,

b. EP-008, Sections 3 2 through 3.9 will be performed once every two refueling cycles.

Because of the concerns expressed in GE Service Advice Letter 9 3175 (CPD3), EP-008 in its entirety will be performed on all safety-related AK-2A breakers prior to or during the next refueling outage.

Very truly yours,

/

JOHN D. LEONARD, JR.

JDL:VMW:cmh Enclosures cc: G. T. Berry, PASNY, NY0 G. A. Wilverding, PASNY, NY0 P. W. Lyon, PASNY, NY0 M. C. Cosgrove, JAF R. J. Pasternak, JAF Document Control Center 2142 073

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