ML20138J575

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Rev 13 to OP 341 4,160-Volt Electrical Sys
ML20138J575
Person / Time
Site: Millstone Dominion icon.png
Issue date: 03/28/1985
From: Lemke J
NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20138J567 List:
References
NUDOCS 8510290392
Download: ML20138J575 (8)


Text

E. J. Mr7czka Fcrm Apprev d by Station Superintendent 2-1-85

. Effcctiva Data STATION PROCEDURE COVER SHEET A. IDENTIFICATION Number OP 341 Rev. ~

13 Title _4160 VOLT ELECTRICAL SYSTEM Prepared By J. A. Lemke B. REVIEW I have reviewed the above procedure and have found it to be satisfactory.

TITLE SIGNATURE DATE DEPARTMENT HEAD k .I .

ki O!$7 seo VM 6:n i

C.

UNREVIEWED SAFETY QUESTION EVALUATION DOCUMENTATION REQUIRE (Significant change in procedure method or scope as described in FSAR) YES [ ] NO W

.(If yes, document in PORC/SORC meeting minutes)

ENVIRONMENTAL IMPACT (Adverse environmental impact)

(If yes, document in PORC/SORC meeting minutes) YES [ ] NO ((

D.

INTEGRATED SAFETY REVIEW REQUIRED (Affects response of Safety Systems, performance of safety related control systems or performance YES [ ] NO ((

of control systems which may indirectly affect safety system response.)

(If yes, document in PORC/SORC meeting minutes.)

E. PROCEDURE REQUIRES JSORC REVIEW YES [ NO [ ]

F. RO/SORC APPROVAL

/SORC Meeting Number /~ i .,

G.

APPROVAL AND IMPLEMENTATION The attached procedure is hereby approved, and effective on the date below:

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Sta ti on/ Serv i c e/ U a4FS upe r i n ta nde6 t 3 - V~

Effective Date

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SF 301 I 0510290392 PDR ADOCK O 85go g Rev. 7 P PDR Page 1 of 1 l

OP 341 'Paga 70 '

. Rev. 13 f) 8 ,39.6 Subsequent Action 8.39.6.1 If unable to restore 125V D.C. to bus 14G,  !

station operator at bus to provide emerg.

trip capability of bkrs. on 14G.

8.39.6.2 Notify electrical maintenance and higher supervision.

8.40 Emer. SS Transformer Differential Current Trip 8.40.1 Location: Panel 908 Section A2-1 Window 4-1 '

8.40.2 Instrument: 74-1-50 Relay 8.40.3 Setpoint: Transformer phase currents unbalanced 8.40.4 Automatic Action: . Alarm t

Isolation of ESST 8.40.5 Immediate Action: ,

8.40.5.1 Verify opening of E.S.S.T. low side bkr.

8.40.5.2 Verify opening of E.S.S.T. high side disconnect.

8.40.5.3 Visually inspect transformer for fire or

! oil leakage.

8.40.6 Subsequent Action:  !

8.40.6.1, Notify convex of trip.

8.40.6.2 If E.S.S.T. supplying station service prior to trip, start gas turbine and place in service carrying station auxilliary load. .

8.40.6.3 Notify electrical maintenance and higher supervision.

l 8.40.6.4 Carry out provisions of 1-0PS-6.02 if necessary.

t 8.414KV Auxiliary Buses Loss of Normal Power or Deoraded Voltaae -

8.41.1 Panel 923, Section A1, Window 6-3. .. ,

8.41.2 Initiating Devices:

8.41.2.1 62DA/14AC or 62DA/14F.

8.41.2.2 62DT/14AC or 620T/14F.

s 8.41.2.3 62LT/14AC or 62LT/14F.

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_ _ - - - . . - - - - _ _ _ - _ . - - _ . . , _ - , . - , _ - , _ - - . . . - . . . . . ~ , .

OP 341 Pzge 71 Rsv. 13

} 8 41.3 Setpoints (respectively):

8.41.3.1 3620 VAC for 10 seconds (both).

8.41.3.2 3620 VAC for 12.0 seconds and 8.0 seconds (respectively).

8.41.3.3 2800 VAC for 1.5 seconds (both).

8.41.4 Automatic Action:

8.41.4.1 Alarm Only.

8.41.5 Initial Operator Action: '

8.41.5.1 Monitor 4KV bus voltmeters on CRP908.

8.41.5.2 If voltage greater than 3620 VAC, check relays in Panels L2421A, L24218, and L2422 for spurious operation by checking the relay targets. Note time and date of

, operation and notify engineering.

8.41.5.3 If voltage less than 3620 VAC but greater than 2800 VAC, check for proper operation of 62DT/14AC and/or 62DT/14F.

8.41.5.4 If voltage less than 2800 VAC, check for proper operation of 62LT/14AC and/or 62LT/14F.

8.42 4KV Auxiliary Buses LNP Detectors or Undervoltage Protection Assemblies Loss of DC Control Power 8.42.1 Panel 923, Section A1, Window 6-4.

8.42.2 Initiating Devices:

8.42.2.1 27DCA/S1 8.42.2.2 27DCA/S2

8.42.3 Setpoints (respectively)

8.42.3.1 Loss of DC control power to VPA panels L2421A and L24218.

8.42.3.2 Loss of DC control power to VPA panel L2422.

8.42.4 Degraded and loss of voltage protection logics are defeated.

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OP 341- Page 72 Rav. 13

?) 8 42.5 Initial Operator Action:

8.42.5.1 Check control room distribution panels; DC-11A-1 circuit 15 and/or DC-11A-2 circuit 15.

8.42.5.2 Check DC switchboard 101A, circuits 30 and 31, and 101B, circuits 29 and 30.

8.42.5.3 Check fuses (10A) on block FU1 in panels L2421A, 12421B, and L2422.

8.42.6 Subsequent Action:

8.42.6.1 If problem was due to breaker trip or blown fuse, initiate action to determine cause of fault.

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APPROVED BY [ // N FORM NO. 230-973 DATE E9 /-fi /rs- CRP-923 REV. 1 PORC MTG NO E ys-5 7 DATE 9/2 3/g/

HP HTR 'A' HP HTR 'A' HP HTR 'B' HP HTR 'B' LEVEL HIGH (1-1) LEVEL LOW (1-2) LEVEL HIGH (1-3) LEVEL LOW (1-4)

HIP HTR 'A' HIP HTR 'A' HIP HTR 'B' LEVEL HIGH HIP HTR 'B' (2-1) LEVEL LOW (2-2) LEVEL HIGH (2-3) LEVEL LOW (2-4)

IP HTR 'A' IP HTR 'A' IP HTR 'B' LEVEL HIGH IP HTR 'B' (3-1) LEVEL LOW (3-2) LEVEL HIGH (3-3) LEVEL LOW (3-4)

LIP HTR 'A' LIP HTR 'A' LIP HTR 'B' LIP HTR 'B' LEVEL HIGH (4-1) LEVEL LOW (4-2) LEVEL HIGH (4-3) LEVEL LOW (4-4)

LP HTR 'B' LP HTR 'B' LP HTR 'A' LP HTR 'A' LEVEL HIGH (5-1) LEVEL LOW (5-2) LEVEL HIGH (5-3) LEVEL LOW (5-4) 4KV BUSSES DEGRADED UNDERV0LTAGE PROTECTION V0LTAGE OR LOSS OF ASSEMBLIES LOSS OF DC (6-1) (6-2) NORMAL POWER (6-3) CONTROL POWER (6-4)

JF:ejl/CRP1 FORM NO. 230-973 REV. 2

. APPROVED BY DATE: o /, s f.oe

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PORC MTG NO: / - ps,n ANNUNCIATOR ALARM AND RESPONSE PANEL /SECTION 923/A1 WINDOW 6-3 ALARM TITLE 4KV busses degraded voltage or loss of normal power.

INSTRUMENT AND SETPOIh"I 62DA/14AC or 62DA/14F: 3620 VAC 62DT/14AC or 62DT/14F: 3620 VAC 62LT/14AC or 62LT/14F: 2800 VAC AUTOMATIC ACTION Alarm only.

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IMMEDIATE ACTION Verify undervoltage condition on 4KV Bus 14A, 14C, 14E, and/or 14F.

SUBSEQUENT ACTION I.A.W. OP 341 Section 8.41.6 l REFERENCES l

i OP 341 TECH SPEC N/A P&ID N/A C.W.D 268D DYaco OPS FORM 230-996 REV. 1 8 FORMS i

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APPROVED BY d / ,. . DATE:

4. /u /se- PORC MTG NO: >- fr.5 >

y- -

ANNUNCIATOR ALARM AND RESPONSE PANEL /SECTION 923/A1 WINDOW 6-4 ALARM TITLE Undervoltage protection assemblies loss of DC control power.

INSTRUMENT AND SETPOIh7 27DCA/14AC or 27DCA/14F: Loss of control power to panels L2421A and L2421B and/or L2422.

AUTOMATIC ACTION Alarm only.

IMMEDIATE ACTION Check control room distribution panels DC-11A-1 circuit 15 and/or DC-11A-2 circuit 15.

SUBSEQUENT ACTION I.A.W. OP 341 Section 8.

42.6 REFERENCES

OP 341 TECH SPEC N/A P&ID N/A C.W.D 268D DY:ro OPS FORM 230-997 REV. 1 8 FORMS

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i Millstone Nuclear Power Station, Unit No.1 RSST Undervoltage Alarm and Operating Procedures l

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