ML18139B305
| ML18139B305 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 05/12/1981 |
| From: | Sylvia B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Varga S Office of Nuclear Reactor Regulation |
| References | |
| 278, NUDOCS 8105150208 | |
| Download: ML18139B305 (5) | |
Text
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VIRGINIA ELEC'.J.'RIC AND POW:E:8 COMPANY
- 8.ICHMOND,VIBGINIA 23261 May 12, 1981 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation Attn:
Mr. Steven A. Varga, Chief Serial No. 278 NO/RGS:ms Docket Nos. 50-280 50-281 License Nos. DPR-32 DPR-37 Operating Reactors Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Gentlemen:
ANNUNCIATOR SYSTEM FOR DIESEL GENERATORS SURRY POWER STATION UNIT NOS. 1 AND 2 This is in response to a letter dated February 7, 1981, regarding a request for information relative to the annunciator system for the diesel generators at Surry Power Station.
NRC Request:
"1.
Disabling and non-disabling conditions for each diese_l generator should be separated and annunciated using separate annunciator systems."
Response
Two conditions which initiate the "NOT AUTOMATIC ALARM" on the local diesel control panel and in turn initiate the "Emergency Generator Trouble" annunciator in the Control Room would prevent an auto start of an Emergency Diesel Generator.
They are:
- 1) the selector switch on the local diesel control panel in the 11Local Start" position; and
- 2) the "Auto-Exercise" switch on the remote control panel in the Control Room in the "Exercise" position.
All other conditions which would prevent an Emergency Diesel Generator from auto starting and/or going "on-the-line" are annunciated on a.separate annunciator in the Control Room labeled "Emergency Diesel Auto Start Disabled".
A modification has been initiated to rewire the circuitry such that the "NOT AUTOMATIC ALARM" annunciates the "Emergency Diesel Auto Start Disabled" annunciator instead of the "Emergency Generator Trouble" annunciator.
NRC Request:
"2.
The wording on the annunciators for disabling conditions should specifi-cally state that the diesel generator is unavailable for automatic start.-"
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VIRGINIA ELECTRIC AND POWER COMPANY TO
Response
Present wording on the annunciators states that the EDG is unavailable for automatic start as follows:
Annunciator Annunciator Alarm No.
Label lBl Emergency Diesel No. 3 Auto Start Disabled 1B2 Emergency Diesel No. 1 Auto Start Disabled 2C53 Emergency Diesel No. 3 Auto Start Disabled 2C54 Emergency Diesel No. 2 Auto Start Disabled NRC Request:
"3.
Annunciators and alarms shall not be able to be cleared until all abnor-mal conditions have been corrected."
Response
The annunciators listed below will not clear until the abnormal condi-tions have been corrected:
Annunciator Alarm No.
1J55 1J56 2J55 2J56 lBl 1B2 2C53 2C54 1K47 2K47 Annunciator Label Erner. Gen 1 Differential Erner. Gen 2 Differential Erner. Gen 2 Differential Erner. Gen 3 Differential Erner. Diesel No. 3 Auto Start Disabled Erner. Diesel No. 1 Auto Start Disabled Erner. Diesel No. 3 Auto Start Disabled Erner. Diesel No. 2 Auto Start Disabled Battery Low Voltage Battery Low Voltage Abnormal Condition Phase to Phase Fault on Erner. Gen.
Phase to Phase Fault on Erner. Gen.
Phase to Phase Fault on Erner. Gen.
Phase to Phase Fault on Erner. Gen.
(1) Field Failure; (2) Overspeed Trip; and (3) in Cooldown Cycle.
(1) Field Failure; (2) Overspeed Trip; and (3) in Cooldown Cycle.
(1) Field Failure; (2) Overspeed Trip; and (3) in Cooldown Cycle.
(1) Field Failure; (2) Overspeed Trip; and (3) in Cooldown Cycle.
125 VDC 125 VDC
e VIRGINIA ELECTRIC AND POWER COMPANY TO 3
The annunciators listed below can be cleared by pushing the "Alarm Silence" pushbutton on the local diesel generator control panel, but the individual alarm light on the local panel will remain lit until the alarm condition clears (except for abnormal condition f/13) and the "Alarm Silence" and "Alarm Reset" pushbuttons are pushed simultaneously.
The "Not Automatic Alarm" condition (#13) which actuates the "Emergency Generator Trouble" annunciator in the Control Room has seven initiating conditions.
One of these conditions is the NVR relay not picked up.
Any of the following breakers being open will cause the NVR relay to open:
Alarm Control.
The NVR relay is in series with the Alm. relay, which actuates the "Emergency Generator Trouble" annunciator in the Control Room, and this annunciator cannot be cleared until the NVR relay is picked up.
Annunciator Alarm No.
Annunciator Label Abnormal Condition 1J63 Emergency Generator 1 Trouble 1J64 Emergency Generator 3 Trouble (1) Oil Pressure Alarm; (2) Crankcase Pressure Alarm; (3) Low Water Alarm; (4) Circuit Alarm; (5)
No Field Alarm; (6) Generator Breaker Alarm; (7) Air Pressure Alarm; (8) Fuel Transfer Alarm; (9) Hot Engine Alarm; (10) Lube Oil Level Alarm; (11) Lube Oil Temperature Alarm; (12)
Start Failure Alarm;
- 03)
Not Automatic Alarm~\\-;
(14) Overspeed Trip Relay; and (15)
Fuel Pressure Alarm.
(1) Oil Pres~ure Alarm; (2) Crankcase Pressure Alarm; (3) Low Water Alarm; (4) Circuit Alarm; (5)
No Field Alarm; (6) Generator Breaker Alarm; (7) Air Pressure Alarm; (8) Fuel Transfer Alarm; (9) Hot Engine Alarm; (10) Lube Oil Level Alarm; (11) Lube Oil Temperature Alarm; (12)
Start Failure Alarm; (13)
Not Automatic Alarm*;
(14) Overspeed Trip Relay; and (15)
Fuel Pressure Alarm.
e VIRGINIA ELECTRIC AND POWER COMPANY TO 4
2J63 Emergency Generator 2 Trouble 2J64 Emergency Generator 3 Trouble (1) Oil Pressure Alarm; (2) Crankcase Pressure Alarm; (3) Low Water Alarm; (4) Circuit Alarm; (5)
No Field Alarm; (6) Generator Breaker Alarm; (7) Air Pressure Alarm; (8) Fuel Transfer Alarm; (9) Hot Engine Alarm; (10) Lube Oil Level Alarm; (11) Lube Oil Temperature Alarm; (12)
Start Failure Alarm; (13)
Not Automatic Alarm*;'.*;
(14) Overspeed Trip Relay; and (15)
Fuel Pressure Alarm.
(1) Oil Pressure Alarm; (2) Crankcase Pressure Alarm; (3) Low Water Alarm; (4) Circuit Alarm; (5)
No Field Alarm; (6) Generator Breaker Alarm; (7) Air Pressure Alarm; (8) Fuel Transfer Alarm; (9) Hot Engine Alarm; (10) Lube Oil Level Alarm; (11) Lube Oil Temperature Alarm; (12)
Start Failure Alarm; (13)
Not Automatic Alarm-';
(14) Overspeed Trip Relay; and (15)
Fuel Pressure Alarm.
- NOT AUTOMATIC ALARM ACTUATIONS (1)
AIR COMPR. No. 1 switch in OFF position (2)
AIR COMPR. No. 2 switch in Off position (3)
SELECTOR SWITCH "ALS" is in the LOCAL START position (4)
(5)
(6)
(7)
NRC Request:
EXCITER circuit breaker in OFF position Customer's Selector Switch SS in EXERCISE position Overspeed Trip Lever in tripped position (not set)
NVR relay is not picked up.
(Caused by any one of the following:
AC CONTROL, DC CONTROL, START 1, START 2, or ALARM CONTROL circuit breakers in OFF position.)
"4.
Consistent nomenclature for *diesel generator annunciator wording should be used (D/G or EDG; but, not both)."
Response
As shown in our response to items 1 through 3 above, consistent wording is utilized for the diesel generator annunciators.
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VIRGINIA ELECTRIC AND POWER COMPANY TO NRC Request:
"5.
The importance of the "amber"* light indicator light for the Auto Start Unblock should be reviewed relative to the. importance of other colors (red, blue, etc.) used for similar blocked functions."
Response
The "amber" light is only lit when the auto start function is disabled.
This is an abnormal condition.
In the Surry Power Station Control
- Room, "amber" lights function only as an indication of an abnormal condition, so their use in this case is proper.
Very truly yours, IJf?k B. R. Sylvia Manager - Nuclear Operations and Maintenance 5