ML19320C859

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Forwards Reply to IE Bulletin 79-27 Re Loss of non-Class IE Instrumentation & Control Power.Performed Review & Evaluation of Power Supplies Which Could Affect Ability to Achieve Cold Shutdown
ML19320C859
Person / Time
Site: Yankee Rowe
Issue date: 06/18/1980
From: Moody D
YANKEE ATOMIC ELECTRIC CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-79-27, WYR-80-70, NUDOCS 8007180144
Download: ML19320C859 (15)
v • d • e


Text

w Telephone 617 366-9011 rwx 710 390 0739 YANKEE ATOMIC El.ECTRIC COMPANY

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20 Turnpike Road Westborough, Massachusetts 31581 st

_ M-June 18, 1980 B.4.1.1 WYR 80-70 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention:

Office of Inspection and Enforcement Mr. Boyce H. Grier, Director

References:

(a)

License No. DPR-3 (Docket Ne 50-29)

(b)

USNRC Letter to YAEC dated November 30, 1979.

(c) YAEC Letter to USNRC dated February 29, 1980 (WYR 80-25)

(d) USNRC Letter to YAEC dated April 4,1980.

Dear Sir:

Subjec t: Response to IE Eulletin 79-27; " Loss of Non-Class 1E Instrumentation and Control Power System Eus During Operation" As requested in Reference (b), we have performed a review and evaluation of Class 1E and Non-Class 1E power supplies to safety and non-safety related instrumentation and control systems which could affect the ability to achieve a cold shutdown condition using existing procedures.

The enclosure provides the results of cur review and responds to the questions of Reference (b).

We trust you will find this information satisfactory; however, should you desire additional information, please to contact us.

Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY

$.l.h D. E. Moody Manager of Operations BLD/sec Enclosure A 80 07180/Y g

ENCLOSURE A Response to IE Bulletin 79-27 for Yankee Rowe Discussion The electrical system at Yankee Rowe was reviewed to determine the effects of loss of power to buses supplying safety related and non-safety related instrumentation and control systems which affect the ability to achieve a cold shutdown condition. As part of this study, applicable plant procedures were reviewed to determine those systems or subsystems that are required to place the plant in a cold shutdown condition.

The review included instrumentation, control systems and their related power sources that would indicate system status to the operator.

Item 1:

" Review the Class 1E and Non-Class 1E buses supplying power to safety and non-safety related instrumentation and control systems which could affect the ability to achieve a cold shutdown condition using existing procedures or procedures developed under Item 2 below.

For each bus:"

Response

I & C Buses The following I & C Buses supply power to loads that are used during the shutdown and cooldown of the plant:

1.

Vital Bus 2.

Transformer "A" Bus 3

Transformer "B" Bus 4.

125 Volt DC Dsttery Eca No. 1 5.

125 Volt DC Battery Bas No. 2 6.

125 volt DC Battery Bus No. 3 Note:

Please refer to the attached drawings for the arrangement of applicable plant electrical systems.

Item 1(a):

" Identify and review the alarm and/or indication provided in the control room to alert the operator to the loss of power to the bus."

Response

The buses listed above are provided with the following alarms or indications in the main control room:

Vital Bus - bus voltmeter, ground voltmeters and primary instrumentation Fail Safe panel alarms.

Tr?nnfermer "A* Bun and "B" Bun - No specific alarm; howevar, the Emergency Buses which supply power to Emergency MCC 1 and Transformer "A" Bus and "B" Bus have a common low voltage alarm.

125 Volt DC Battery Bus No.'s 1, 2 & 3 - common low voltage (115 volts) and common critical voltage (105 volts) alarms. Other related alarms or indications:

Battery Charger - auto trip alarm (No. 1 & 2 batteries only)

Battery Charger 3 AC Failure Alarm Spare Battery Charger Loss of AC Alarm Battery Fuse Failure Alarm (No. 1 & 2 battery only)

Diesel Generators DC Control Loss Alarm Ground Detection Voltmeters Item 1(b):

Identify the Instrument and Control System Loads connected to the bus and evaluate the effects of loss of power to these loads including the ability to achieve a cold shutdown condition."

i

Response

1.

Vital Bus Decause of the fail eafe design of the Reactor Protection System, if j

power was lost to th6 vital bus, the reactor would automatically scram. The Vital Bus loads can be energized from two (2) different power sources. The normal power source is the vital bus motor generator set powered from the No.1 Battery.

The Vital Bus backup power supply is MCC 1 bus 2.

The control room operator has the capability to energize the vital bus from the backup supply by operating a control switch in the control room.

Instrumentation and control functions that are powered from this source, and which are used during a sbutdown and cooldown of the plant are listed below on the left.

Alternate instrumentation and control functions powered from separate power sources are listed on the right.

Instrumentation or Control Function Load Alternate (and Power Source)

Nuclear Instrumentation; Refueling Source Range Channel Source, Intermediate (Transformer "A" Bus) and Power Ranges Primary Instrumentation; M.C. Pressure and M.C. Loop Pressure Channels Pressurizer Pressure (Transformer "B" Bus),

Low Temperature Overpressurization System (Transformer "A" Bus) and Heise Gage (Pneumatic) -

M.C. Tcmp;rature and Incoro Th rmocouples cnd Datt Pressurizer Temperature Logger (Lighting Panel), Incore Thermocouple Recorder (Transformer "A" Bus)

Pressurizer Level WR None and NR NR Steam Generator Levels NR & WR Levels Available (Transformer "B" Bus)

Charging Pump Control Circuits Manual Operation from Main Control Board (Pneumatic) 2.

Transformer "A" Bus Transformer "A" Bus is energized from Emergency MCC 1.

Emergency MCC 1 is normally supplied by Emergency Bus No.1 and can be alternately supplied by Emergency Bus No. 3 through a manual throwover switch.

Instrumentation and control functions that are powered from this source, and which may be used during a shutdown and cooldown of the plant are listed below on the left.

Alternate instrumentation and control functions powered from separate power sources are listed on the right.

Instrumentation or Control Functiqn Load Alternate and Power Source Rod Position Indicating Nuclear Instrumentation Lights (Vital Bus)

Low Temperature Over Main Coolant Pressure and Pressurization System Temperature (Vital Bus)

Charging Pump Flow and Local pressure Indication Pressure (direct)

Bleed Flow Low Pressure Surge Tank Level Channel (Pneumatic)

LP Surge Tank Pressure-Local Indication

& Level Refueling source range Nuclear Instrumentation channel Channal a (Vital Bus)

Incore thermocouple M.C. temperature (vital bos) recorder and Data Logger (lighting panel) -

3.

Tr nnformer "B2 Bu1 Transformer "B" Bus is energized from Emergency MCC 1 in the same fashion as Transformer "A" Bus discussed above.

i Instrumentation and control functions that are powered from this source, and which may be used during a shutdown and cooldown of the plant are listed below on the left.

Alternate instrumentation and control functions powered from separate power sources are listed on the right Instrumentation or Control Function Load Alternate and Power Source Secondary Instrumentation; S.G. Narrow and Wide S.G. Narrow Range Level Range Level (Vital Bus)

M.C. Loop Pressures M.C. Pressure (Vital Bus) and Low Temperature Overpressurization System (Transformer "A" Bus) 4.

125 V DC Battery Bus No. 1 The 125 V DC Battery Bus No. 1 is normally powered from the No. 1 Battery and its associated charger which is powered from MCC 1 Bus 1.

The spare battery charger is available for backup purposes.

A manually operated tie is available to tie the No.1 and No. 2 battery buses during maintenance.

Instrumentation and control functions that are powered from this source, and which are used during a shutdown and cooldown of the plant are listed below on the left.

Alternate instrumentation and control functions powered from separate power sources are listed on the right.

Instrumentation or Control Function Load Alternate and Power Source Vital Bus Motor Generator Backup Supply MCC 1 Bus 2 Set Control Power 480 volt Manual Trip and Manual Switchgear Bus 6-3 Closure of Individual Breakers (Mechanical)

Control Power 2400 volt Manual Trip and Manual Switchgear Bus 3 Closure of Individual Breakers (Mechanical)

-4

5.

125 V DC Battsry Bu7 No. 2 The 125 V DC Battery Bus No. 2 is norcally powered from the No. 2 Battery and its associated charger which is powered from MCC 1 Bus 2.

The spare charger and the tic capability delineated above for Battery Bus No.1 are applicable to Battery Bus No. 2.

Instrumentation and control functions that are powered from this source, and which are used during a shutdown and cooldown of the plant are listed below on the left.

Alternate instrumentation and control functions powered from separate power sources are listed on the right.

Instrumentation or Control Function Load Alternate and Power Source Control Power 480 volt Manual Trip and Manual Switchgear Bus 4-1 Closure of Individual Breakers (Mechanical)

Control Power 2400 volt Manual Trip and Manual Switchgear Bus 1 Closure of Individual b-eakers (Mechanical) 6.

125 V DC Battery Bus No. 3 The 125 V DC Battery Bus No. 3 is normally powered from the No. 3 Battery and its associated charger which is powered from Emergency MCC 2.

The spare battery charger is available for backup purposes.

A manually operated tie is available to tie the No. 3 and No. 2 battery buses during maintenance.

Instrumentation and control functions that are powered from this source, and which are used during a shutdown and cooldown of the plant are listed below on the left.

Alternate instrumentation and control functions powered from separate power sources are listed on the riSht.

Instrumentation or Control Functica Load Alternate and Power Source Control Power 480 volt Manual Trip and Manual Switchgear Bus 5-2 Closure of Individual Breakers (Mechanical)

Control Power 2400 volt Manual Trip and Manual Switchgear Bus 2 Closure of Individual Breakers (Mechanical) l Item 1(c):

" Describe any proposed design modifications resulting from these reviews and evaluations and your proposed schedule for implementing those modifications."

Hrponm The following d2cign IIodific0tions will b3 mada:

The Vital Bus - No modifications are required.,

Transformer "A" Bus - An undervoltage relay will be added to alarm in the main cor. trol room to indicate Transformer "A" Bus power failure. This alarm will be installed during the next refueling outage.

Transformer "B" Bus - An undervoltase relay will be added to alarm in the main control room to indicate Transformer "B" Bus power failure.

This alarm will be installed during the next refueling outage.

A new pressurizer wide range level channel will be added on Transformer "B" Bus to provide a backup indication to the pressurizer t;ide range level on the Vital Bus.

This new channel will be implemented during the next refueling outage.

125 Volt DC Battery Buses 1, 2 & 3 - No modifications are required.

Item 2:

" Prepare emergency procedures or review existing ones that will be used by control room operators, including procedures required to achieve a cnid shutdown condition, upon loss of power to each Class 1E and Non-Class 1E bus supplying power to safety and non-safety related instrument and control systems.

The emergency procedures should include:

a.

The diagnostics / alarms / indicators / symptoms resulting from the review and evaluation conducted per Item 1 above.

b.

The use of alternate indication and/or control circuits which may be powered from other Non-Class 1E or Class 1R instrumentation and control buses.

c.

Methods for restoring oower to the bus.

Describe any proposed design modification or administrative controls to be implemented resulting from these procedures, and your proposed schedule for implementing the changes."

Response

Vital Bus - Emerger.cy Procedure (s) will be updated to includs more information to the operator in the event of a loss of power to the vital bus. This information will include specific instructions on methods for restoring power to the vital bus as well as alternate instrumentation that could be used until the vital bus was reenergized.

Transformer "A" "B" Buses - An emergency procedure will be developed to inform the operator of methods for restoring power to the bus loads as well as alternate instrumentation that could be used until the bus is reenergized. l

=.-_

125 Volt DC Battery Buses 1, 2, & 3_ - Existing procedures and a new procedure will be developed to include more information and specific instructions on meth instrumentation that could be used until the bus is reenergized.

The above proposed modifications to the procedures will be implemented prior to plant restart.

Vital "Re-review IE Circular No. 79-02, Failure to 120 Volt 11, 1979, to include both Item 3 AC Power Supplies, dated January Class 1E and Non-Class 1E safety related powe your re-review of IE Circular No. 79-02, de inverters.

t ols to be implemented as a result of the re-review.

We believe the IE Circular No. 79-02 is not applicable to the Yankee Rowe design for the following reasons:

Response _:

Yankee Rowe does not use inverters to power the A do instrumentatien and control buses or panels.

120 motor driven ac Generator set is used to power the The output of this motor generator volt Vital Bus.

The concerns expressed in the set is monitored.

circular are not applicable to this motor generator set.

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