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{{#Wiki_filter:e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 March 3, 1987 W. L. STEWART VICE PRESIDENT NucLEAR OPERATIONS U. S. Nuclear Regulatory Commission                           Serial No.      86-801 Attn: Document Control Desk                                   NO/ETS:vlh Washington, D. C. 20555                                       Docket Nos. 50-280 50-281 License Nos. DPR-32 DPR-37 Gentlemen:
{{#Wiki_filter:e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 W. L. STEWART VICE PRESIDENT NucLEAR OPERATIONS March 3, 1987 U. S. Nuclear Regulatory Commission Attn:
VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 USE OF INADEQUATE CORE COOLING MONITOR FOR RCP TRIP In our letter dated December 6, 1985 (Serial No. 85-510B), Virginia Electric and Power Company provided a response to Generic Letter 85-12, concerning reactor     coolant       pump trip criteria and instrumentation.         This letter supplements our response, addressing the use of the recently installed Inadequate Core Cooling Monitor (ICCM) instrumentation to monitor the core subcooling margin parameter used for RCP trip. The design details of this system were provided by previous correspondence. The ICCM can now use either core-exit thermocouples or the wide-range loop RTDs as input to subcooling margin.
Document Control Desk Washington, D. C.
The ICCM system was installed at Surry Units 1 and 2 to satisfy the requirements for detection of Inadequate Core Cooling contained in NUREG-0737, Section II.F.2.         The core subcooling margin monitor subsystem of the ICCM is being used to monitor core subcooling margin, which is the parameter used to determine reactor coolant pump trip requirements in the Surry Emergency Operating Procedures.           With the     installation of   qualified   core-exit thermocouples completed, the ICCM uses the core-exit thermocouples as the normal input for temperature to the core subcooling margin monitor subsystem.
20555 Gentlemen:
Attachment     1 provides the associated supplemental information for the additional instruments and uncertainties.               The remainder of the       items addressed in our December 6, 1985 response to Generic Letter 85-12 remain applicable.
VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 USE OF INADEQUATE CORE COOLING MONITOR FOR RCP TRIP Serial No.
Should you have any questions concerning this information, please           contact us at your earliest convenience.
NO/ETS:vlh Docket Nos.
Very truly yours,
License Nos.
    ~~*
86-801 50-280 50-281 DPR-32 DPR-37 In our {{letter dated|date=December 6, 1985|text=letter dated December 6, 1985}} (Serial No. 85-510B), Virginia Electric and Power Company provided a response to Generic Letter 85-12, concerning reactor coolant pump trip criteria and instrumentation.
W. L. Stewart Attachment 870310036~870303 PDR ADOCK 05000280 p                     PDR
This letter supplements our
: response, addressing the use of the recently installed Inadequate Core Cooling Monitor (ICCM) instrumentation to monitor the core subcooling margin parameter used for RCP trip.
The design details of this system were provided by previous correspondence.
The ICCM can now use either core-exit thermocouples or the wide-range loop RTDs as input to subcooling margin.
The ICCM system was installed at Surry Units 1
and 2
to satisfy the requirements for detection of Inadequate Core Cooling contained in NUREG-0737, Section II.F.2.
The core subcooling margin monitor subsystem of the ICCM is being used to monitor core subcooling margin, which is the parameter used to determine reactor coolant pump trip requirements in the Surry Emergency Operating Procedures.
With the installation of qualified core-exit thermocouples completed, the ICCM uses the core-exit thermocouples as the normal input for temperature to the core subcooling margin monitor subsystem.
Attachment 1
provides the associated supplemental information for the additional instruments and uncertainties.
The remainder of the items addressed in our December 6,
1985 response to Generic Letter 85-12 remain applicable.
Should you have any questions concerning this information, please contact us at your earliest convenience.
Very truly yours,  
~~*
W. L. Stewart Attachment 870310036~870303 PDR ADOCK 05000280 p
PDR  


cc: U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N. W.
cc:
Suite 2900 Atlanta, Georgia 30323 Mr. W. E. Holland NRC Senior Resident Inspector Surry Power Station
U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N. W.
Suite 2900 Atlanta, Georgia 30323 Mr. W. E. Holland NRC Senior Resident Inspector Surry Power Station  


e ATTACHMENT 1 USE OF THE INADEQUATE CORE COOLING MONITOR FOR MONITORING RCP TRIP SUBCOOLING PARAMETER SURRY POWER STATION
e ATTACHMENT 1 USE OF THE INADEQUATE CORE COOLING MONITOR FOR MONITORING RCP TRIP SUBCOOLING PARAMETER SURRY POWER STATION  


e Section IV.A.I - Identify Required Instrumentation For the Surry plant, RCS subcooling has been chosen as the criterion for manually   tripping reactor coolant pumps (RCPs)..       The primary means of subcooling indication is the subcooling margin monitor subsystem of the Inadequate Core Cooling Monitor (ICCM), which receives temperature input from the core exit thermocouples. Backup temperature indication is available from the hot leg RTDs.       Emergency Operating Procedure setpoint values are being revised to include adequate uncertainties to accommodate subcooling indication from either source.     Use of the subcooling criterion requires the following instrumentation: 1) wide range RCS pressure transmitters, 2) core exit thermocouples and 3) Inadequate Core Cooling Monitor. The channel mark numbers and instrument model numbers are provided below. The required subcooling value for RCP trip will be read directly from the ICCM display.
e Section IV.A.I - Identify Required Instrumentation For the Surry plant, RCS subcooling has been chosen as the criterion for manually tripping reactor coolant pumps (RCPs)..
Mark No.               Instrument Make/
The primary means of subcooling indication is the subcooling margin monitor subsystem of the Inadequate Core Cooling Monitor (ICCM), which receives temperature input from the core exit thermocouples.
Parameter            Channel A       Channel B         Model No.
Backup temperature indication is available from the hot leg RTDs.
Wide Range RCS Pressure  PT-402         PT-402-1         Rosemount/1153GD9 Core Exit Temperature    CET (25 total) CET (25 total)  Westinghouse/WL-24295 RCS Subcooling            ICC Train A    ICC Train B      Westinghouse Section IV.A.2 - Identify Instrumentation Uncertainties Listed below are the specific normal and adverse instrument uncertainties for the portion of the instrument loop which is input to the ICCM subcooling margin monitor. The overall channel accuracy for subcooling includes these individual instrument uncertainties combined with uncertainties associated with processing and reading the subcooling indication. The adverse containment parameters were selected to bound the plant Environmental Zone Descriptions for the area in which required instrumentation is located.
Emergency Operating Procedure setpoint values are being revised to include adequate uncertainties to accommodate subcooling indication from either source.
Instrument Uncertainty for These Containment Conditions Parameter                    Normal                 Adverse Wide Range RCS Pressure          +/- 52 psi             +/- 352 psi Core Exit Temperature            +/- 21.1°F             +/- 27.8°F}}
Use of the subcooling criterion requires the following instrumentation:
: 1) wide range RCS pressure transmitters,
: 2) core exit thermocouples and 3) Inadequate Core Cooling Monitor.
The channel mark numbers and instrument model numbers are provided below.
The required subcooling value for RCP trip will be read directly from the ICCM display.
Parameter Wide Range RCS Pressure Core Exit Temperature RCS Subcooling Mark No.
Channel A Channel B PT-402 CET (25 total)
ICC Train A PT-402-1 CET (25 total)
ICC Train B Instrument Make/
Model No.
Rosemount/1153GD9 Westinghouse/WL-24295 Westinghouse Section IV.A.2 - Identify Instrumentation Uncertainties Listed below are the specific normal and adverse instrument uncertainties for the portion of the instrument loop which is input to the ICCM subcooling margin monitor.
The overall channel accuracy for subcooling includes these individual instrument uncertainties combined with uncertainties associated with processing and reading the subcooling indication.
The adverse containment parameters were selected to bound the plant Environmental Zone Descriptions for the area in which required instrumentation is located.
Parameter Wide Range RCS Pressure Core Exit Temperature Instrument Uncertainty for These Containment Conditions Normal Adverse  
+/- 52 psi  
+/- 21.1°F  
+/- 352 psi
+/- 27.8°F}}

Latest revision as of 20:15, 5 January 2025

Suppls 851206 Response to Generic Ltr 85-12 Re Reactor Coolant Pump Trip Criteria & Instrumentation.Inadequate Core Cooling Monitor Uses core-exit Thermocouples or wide-range Loop RTDs as Input to Subcooling Margin
ML18150A002
Person / Time
Site: Surry  
Issue date: 03/03/1987
From: Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
86-801, GL-85-12, NUDOCS 8703100365
Download: ML18150A002 (4)
v • d • e


Text

e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 W. L. STEWART VICE PRESIDENT NucLEAR OPERATIONS March 3, 1987 U. S. Nuclear Regulatory Commission Attn:

Document Control Desk Washington, D. C.

20555 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 USE OF INADEQUATE CORE COOLING MONITOR FOR RCP TRIP Serial No.

NO/ETS:vlh Docket Nos.

License Nos.86-801 50-280 50-281 DPR-32 DPR-37 In our letter dated December 6, 1985 (Serial No. 85-510B), Virginia Electric and Power Company provided a response to Generic Letter 85-12, concerning reactor coolant pump trip criteria and instrumentation.

This letter supplements our

response, addressing the use of the recently installed Inadequate Core Cooling Monitor (ICCM) instrumentation to monitor the core subcooling margin parameter used for RCP trip.

The design details of this system were provided by previous correspondence.

The ICCM can now use either core-exit thermocouples or the wide-range loop RTDs as input to subcooling margin.

The ICCM system was installed at Surry Units 1

and 2

to satisfy the requirements for detection of Inadequate Core Cooling contained in NUREG-0737,Section II.F.2.

The core subcooling margin monitor subsystem of the ICCM is being used to monitor core subcooling margin, which is the parameter used to determine reactor coolant pump trip requirements in the Surry Emergency Operating Procedures.

With the installation of qualified core-exit thermocouples completed, the ICCM uses the core-exit thermocouples as the normal input for temperature to the core subcooling margin monitor subsystem.

Attachment 1

provides the associated supplemental information for the additional instruments and uncertainties.

The remainder of the items addressed in our December 6,

1985 response to Generic Letter 85-12 remain applicable.

Should you have any questions concerning this information, please contact us at your earliest convenience.

Very truly yours,

~~*

W. L. Stewart Attachment 870310036~870303 PDR ADOCK 05000280 p

PDR

cc:

U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N. W.

Suite 2900 Atlanta, Georgia 30323 Mr. W. E. Holland NRC Senior Resident Inspector Surry Power Station

e ATTACHMENT 1 USE OF THE INADEQUATE CORE COOLING MONITOR FOR MONITORING RCP TRIP SUBCOOLING PARAMETER SURRY POWER STATION

e Section IV.A.I - Identify Required Instrumentation For the Surry plant, RCS subcooling has been chosen as the criterion for manually tripping reactor coolant pumps (RCPs)..

The primary means of subcooling indication is the subcooling margin monitor subsystem of the Inadequate Core Cooling Monitor (ICCM), which receives temperature input from the core exit thermocouples.

Backup temperature indication is available from the hot leg RTDs.

Emergency Operating Procedure setpoint values are being revised to include adequate uncertainties to accommodate subcooling indication from either source.

Use of the subcooling criterion requires the following instrumentation:

1) wide range RCS pressure transmitters,
2) core exit thermocouples and 3) Inadequate Core Cooling Monitor.

The channel mark numbers and instrument model numbers are provided below.

The required subcooling value for RCP trip will be read directly from the ICCM display.

Parameter Wide Range RCS Pressure Core Exit Temperature RCS Subcooling Mark No.

Channel A Channel B PT-402 CET (25 total)

ICC Train A PT-402-1 CET (25 total)

ICC Train B Instrument Make/

Model No.

Rosemount/1153GD9 Westinghouse/WL-24295 Westinghouse Section IV.A.2 - Identify Instrumentation Uncertainties Listed below are the specific normal and adverse instrument uncertainties for the portion of the instrument loop which is input to the ICCM subcooling margin monitor.

The overall channel accuracy for subcooling includes these individual instrument uncertainties combined with uncertainties associated with processing and reading the subcooling indication.

The adverse containment parameters were selected to bound the plant Environmental Zone Descriptions for the area in which required instrumentation is located.

Parameter Wide Range RCS Pressure Core Exit Temperature Instrument Uncertainty for These Containment Conditions Normal Adverse

+/- 52 psi

+/- 21.1°F

+/- 352 psi

+/- 27.8°F

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