ML20138J571
| ML20138J571 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/27/1984 |
| From: | Sauer G NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML20138J567 | List: |
| References | |
| NUDOCS 8510290390 | |
| Download: ML20138J571 (10) | |
Text
.
E.J. Mroczka 8-25-83 Form Approved by Station Superintendent Effective Date STATION PROCEDURE COVER SHEET A.
IDENTIFICATION Number OP 342A Rev.
4 Title 480V ELECTRICAL SYSTEM UNDER/0VER-VOLTAGE Prepared By G. Sauer B.
REVIEW I have reviewed the above procedure and have found it to be satisfactory.
DEPARTMENT
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UNREVIEWED SAFETY QUESTION EVALUATION DOCUMENTATION REQUIRED:
(Significant change in procedure method or scope
)
as described in FSAR)
YES [ ]
N0 [g (If yes, document in PORC/SORC meeting minutes)
ENVIRONMENTAL IMPACT (Adverse environmental impact)
YES [ ]
NO [Q (If yes, document in PORC/SORC meeting minutes)
D.
PROCEDURE REQUIRES PORC/SORC REVIEW YES [ g N0 [ ]
[0k/SORCAPPROVAL E.
BC)SORCMeetingNumber
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F.
APPROVAL AND IMPLEMENTATION The attached procedure is hereby approved, and effective on the date below:
D' 6b27/8y Station /SetVice/ Unit Superintendent Effective Date SF-301 Rev. 6 8510290390 851009 PDR ADOCK 05000245 P
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OP 342A Page 1 Rev. 4 3-Unit 1
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480V ELECTRICAL SYSTEM UNDER/0VER-VOLTAGE Page No.
Eff. Rev.
1-6 4
)
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OP 342A Page 2 Rev. 4 h
1.
OBJECTIVE P
The purpose of this operating procedure is to provide operating l
guidelines should an abnormal voltage condition (<426 VAC or >494 i
VAC) exist on bus 12E or 12F.
2.-
LICENSE REQUIREMENTS 2.1 Millstone Nuclear Power Station Unit 1 Technicial Specifications, Section 3.9 " Auxiliary Electrical System",
i paragraph A.4.a.
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3.
FSAR REFERENCES 3.1' Volume 2,Section VIII, " Electrical 5.ystem".
4.
PLANT OPERATING REQUIREMENTS l
4.1 This procedure applies during periods when station service is being supplied by either the Normal or Reserve Station Service Transformer.
b 5.
PREREQUISITES l-L (N/A, All applicable prerequisites are covered by 0.P. 342).
6.
PRECAUTIONS 6.1 When station service is being supplied by the NSST or RSST, t
check that the voltage on bus 12E and 12F is >426 VAC when any of.the following occur:
l 6.1.1 345 KV line voltage at or below 345 KV.
l 6.1.2 Heavy loading on load center transformer 12E or 12F.
6.1.3 A 4160 VAC motor is started..
6.1. 4 A large 480 VAC motor supplied by 12E or 12F is started.
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6.2 When station service is being supplied by the RSST, check that the voltage on busses 12E and 12F is <494VAC when any of the following occur:
6.2.1 345KV line voltage at 362 KV.
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OP 342A Page 3 Rev. 4 g
6.2.2 A 4160 VAC motor is shutdown.
6.2.3 A large 480 VAC notor supplied by 12E or 12F is shutdown.
6.-3 Do not rack in 12E/12F tie breaker unless plant is in a cold shutdown condition or refuel.
6.4 When performing local switching at a 480 volt load center or at a 4160 volt breaker, the operator should stand to the side of the unit, extending only his arm across the front of the compartment or circuit breaker.
Safety glasses should be worn while performing this switching.
This practice will prevent serious injury if the circuit breaker fails when operated.
7.
PROCEDURE 7.1 Increasing 12E or 12F bus voltage >426 VAC 7.1.1 Increase of 345 KV line voltage 7.1.1.1 Request an increase in line voltage from CONVEX in accordance with established
[
guidelines for 345 KV line.
7.1.2 Reducing load to affected bus (12E or 12F) 7.1.2.1 If a degraded voltage exists on bus 12E, assess securing the following loads considering availability and plant needs:
a.
Shutdown Cooling Pump "A" b.
CU Auxiliary Pump c.
HVE-1A d.
SCCW Pump "A" e.
HVS Fans supplied by MCC E-6 7.1.2.2 If a degraded voltage exists on bus 12F, assess securing the following loads l
considering availability and plant needs:
j a.
Shutdown Cooling Pump "B" b.
Instrument Air Compressor-c.
HVE-1C d.
SCCW Pump "B" e.
HVS Fans supplied by MCC F-6.
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OP 342A Page 4 Rev. 4
]
7.1.3 Reducing Load to 4160 VAC buses 14C and 14D NOTE:
Reducing loads on either 14C or 14D will act to increase voltage on 12E or 12F by increasing low side voltage of Y winding on the NSST or RSST. This option should be used only if unable to increase voltage by securing 480 VAC loads.
7.1.3.1 Secure any of the loads on buses 14C or 14D, if plant conditions permit, and check voltage on 12E and 12F after load is secured.
7.2 Reducing 12E or 12F bus voltage <494 VAC 7.2.1.
Reduction of 345KV line voltage 7.2.1.1 Request a reduction in line voltage from
" Convex loader" in accordance with
- )
established guidelines for 345KV line.
7.2.2 Adding load to affected bus (12E or 12F) 7.2.2.1 If high voltage exists on bus 12E, consider starting the following loads considering availability and plant needs.
a.
Shut-down Cooling Pump "A" b.
CU Aux. Pump c.
HVE-1A d.
SCCW Pump "A" e.
HVS Fans supplied by MCC E-6 7.2.2.2 If high voltage exists on bus 12F, consider starting the following loads considering availability and plant needs.
a.
Shut-down Cooling Pump "B" b.
Instrument air Compressor c.
HVE-1C d.
SCCW pump "B" e.
HVS Fans supplied by MCC F-6 j
OP 342A Page 5 Rev. 4 3
7.2.3 Adding Load to 4160 VAC busses 14C and 14D NOTE:
Adding loads to either 14C or 14D will act to reduce voltage on 12E or 12F by reducing low side voltage of Y winding on R.S.S.T.
This option should be used only if unable to reduce voltage with available 480 VAC loads.
7.2.3.1 Start any of the following loads, if available, and check voltage of 12E and 12F after start.
a.
Circulating Pumps b.
Service Water Pumps c.
Emerg. Service Water Pumps 7.2.4-Placing All Loads on 12E and 12F on One Transformer NOTE:
This i:; the least desirable method of j
reducing voltage on busses 12E or 12F and can be done only with reactor in a cold shutdown or refuel condition.
7.2.4.1 Transfer loads from busses 12E or 12F according to 0.P. 342, procedure steps 7.8.3 or 7.8.4.
l 8.
ALARMS AND MALFUNCTIONS 8.1 480V Load Center Bus 12E or 12F Under/0vervoltage
8.1.1 Location
Panel 908, Section 54A, Window 2-8 l
8.1.2 Initiating Devices:
i.
8.1.2.1 Relay 2/12E or 2/12F 8.1.2.2 Relay 62DA/12E or 620A/12F
8.1.3 Setpoint
(respectively) 8.1.3.1 494 VAC l
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OP 342A Page 6 Rev. 4 8.1.3.2 426 VAC for 1 minute 8.1.4 Automatic Action:
Alarm 8.1.5 Immediate Operator Action:
Verify under or overvoltage condition on Bus 12E or 12F 8.1.6 Subsequent Operator Action:
Restore 12E or 12F Bus voltage to between 426 VAC and 494 VAC in accordance with OP-342A.
9.
CHECK 0FF LISTS None 10.
FIGURES None GS:ejz
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APPil6VED BY O f M FORM NO.
230-705 DATE r z) 7.z t /pe-CRP-908 Al-2 REV.
/ - f e,<7 DATE 9,/ 2 J/gf 4 KV BUS 14A 480V MCC EF3 480V MCC FE3 LOSS OF DC POWER LOSS OF DC CON POWER POWER OR CONTROL POWER OR CONTROL 101 AB 3 (DC 11A-3)
(1-5)
TRANSFERRED TO EMERG. (1-6)
TRANSFERRED TO EMERG (1-7)
(1-8) 4 KV BUS 14B LOSS LOSS OF DC POWER LOSS OF DC POWER 12E/12F OF DC CON POWER (2-5) 101 AB2 (DC 11A-1)
(2-7)
OVER/UNDERV0LTAGE (2-8) 4 KV BUS 14C 4 KV BUS 14C 480 V 4 KV BUS 14C TIE TO 4 KV BUS 14C LOSS 480 V TRANSFORMER TRANSFORMER 4 KV BUS 14E OF DC CON POWER 14C/12C TRIP (3-5) 14C/12C OVERLCnD (3-6)
TRIP (3-7)
(3-8) 4 KV BUS 14D 4 KV BUS 14D 4 KV BUS 14D 4 KV BUS 140 480 V TRANSFORMER 480V TRANSFCRMER TIE TO 4 KV BUS 14F LOSS OF DC CON 14D/120 TRIP (4-5) 14D/12C OVERLOAD (4-6)
TRIP (4-7)
POWER (4-8) 480 V BUS 12D 480V BUS 12D 480V BUS 12D LOSS OF ANNUNCIATOR DC GROUND (5-5)
FEEDER TRIP (5-6)
LOSS DC CON POWER (5-7)
CRP 924/923 (5-8)
CONDENSATE PUMP DISCHARGE CONDENSATE PUMP B00 STER PUf1P B0OSTER PUMP DISCHARGE CONDUCTIVTY HIGH 1 DISCHARGE CONDUCTIVITY DISCHARGE CONDUCTIVITY CONDUCTIVITY HIGH-HIGH (6-5)
HIGH-HIGH 15 (6-6)
HIGH (CRP 905)
(6-7)
(CRP905)
(6-8)
STAT. BATTERY 101B GAS TURBINE FUEL OIL B0OSTER PUMP DISCHARGE B00 STER PUMP DISCHARGE OUTPUT BRKR OPEN STORAGE TANK LEVEL LOW CONDUCTIVITY CONDUCTIVITY HIGH (7-5)
(7-6)
HIGH-HIGH (CRP 931)
(7-7)
CRP (931)
(7-8)
FDR BKR 21S3-1-2 TRIPPED LOSS OF DC CONTROL POWER EMERG. DC CONTROL LOSS OF NORM DC BUS 24F CUBE A601 TO BUS 24F 21S3-1-2 POWER BUS 24F A601 BUS 24F (8-5)
CUBE A 601 (8-6)
ON 21S3-1-2 (8-7) 2153-1-2 (8-8)
M0IST SEP A M0IST SEP B MOIST SEP C MOIST SEP D HI LEVEL TRIP (9-5)
HIGH LEVEL TRIP (9-7) llIGH LEVEL TRIP (9-7)
HIGH LEVEL TRIP (9-8)
IF: ail /CRPl FORM NO. 230-705 REV. 5~
APPROVED BY:
/
DATE:
9 /3, /ps-PORC MTG NO:
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ANNUNCIATOR ALARM AND RESPONSE PANEL /SECTION 908 Al-2 WINDOW 2-8 ALARM TITLE 12E/12F Over/undervoltage INSTRUMENT AND SETPOINT Relays 2/12E or 2/12F: 494 VAC (Overvoltage)
Relays 62DA/12E or 62DA/12F: 424 VAC (Undervoltage)
AUTOMATIC ACTION Alarm only.
IMMEDIATE ACTION Verify over/undervoltage condition on Bus 12E or 12F.
SUBSEQUENT ACTION Reduce or increase 12E or 12F Bus Voltage in accordance with OP-342A.
REFERENCES OP 342A TECH SPEC N/A
,P&ID N/A C.W.D 299A/301A l
DYY8mo OPS FORM 230-721 REV. 2 4 FORMS
Millstone Nuclear Power Station, Unit No.1 4 KV Bus Interim Undervoltage Alarm and Operating Procedures l
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