ML20237H438

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Rev 5 to Abnormal Operating Instruction AOI-25.2, Loss of 120-Volt AC Vital Instrument Power Board 1-II
ML20237H438
Person / Time
Site: Sequoyah Tennessee Valley Authority icon.png
Issue date: 06/19/1987
From: Anthony J, Epperson J
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20237H133 List: ... further results
References
AOI-25.2, NUDOCS 8708170215
Download: ML20237H438 (6)
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TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT ABNORMAL OPERATING INSTRUCTION A01-25.2 LOSS OF 120V AC VITAL INSTRUMENT POWER BOARD 1-11 Unit 1 Revision S

. PREPARED BY:

J. M. Anthony RESPONSIBLE SECTION: Operations REVISED BY:

Jeff Epperson SUBMITTED BY:

b. k u aI s.

gagtpons~ibleSectionSupervisor PORC REVIEW DATE:

JUN 191987 APPROVED BY:

W Plant Manager 0

DATE APPROVED:

Reason for revision (include all Instruction Change Form Nos.):

Revised to delete reference to AOI-l and E0I b.

Streamline Operator actions, and delete erroneous appendices A and 8.

This revision constitutes a biennial review in accordance with

- AI-4. Appendix H.

The last page of this instruction is number:

4 W

ae 8708170215 87 h7 PDR ADOCK O PDR '

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SEQUOYAH NUGLEAR PLANT PLANT INSTRUCTION REVISION LOG ABNORMAL OPERATING INSTRUCTION A0I-25.2 REVISION Date Pages REASON FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected MENTS AND ALL ICF FORM NUMBERS) 0 09/3/80 All 1

12/23/83 2,3,9, i

l 2

09/12/83 All 3

0'//31/84 1,10 4

10/04/84 2

l Revised to delete reference to AOI-l and E0I-0.

Streamline Operator actions, and l

delete erroneous appendices A and B.

This revision constitutes a biennial review in accordance with AI-4, 4

5 ii i M., i Q iCf((

All Appendix H.

w-e x;;.

0079H/ sat /mbs

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SQN AOI-25.2 Page 1

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Revision 5

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I.

SYMPTOMS A.

Alarms 1.

120V AC VITAL PHR BD l-II UV OR BREAKER TRIP 2.

120V AC VITAL INVERTER 1-II ABNORMAL B.

Indications 1.

Power Range N-42 failure.

2.

Auto and manual Rod Block and Rod Stop due to High Flux Rod Stop.

3.

Loss of Steam Flow Portion of Signal to Feedwater control system resulting in failure to control steam generator

" level, if channel II is selected.

4.

Loss of Steam Generator Level Control due to Loss of Input signal to program on steam generators 1 and 4.

5.

Possible Reactor Trip due to Steam Generator Level.

6.

Malfunction of trip status lights and safeguards systems annunciators.

7.

Loss of Auto-Makeup to Volume Control Tank.

C.

System Partial failures 1.

Reduction of Feedwater flow due to demand signal from steam generator 2 falling low.

2.

If a centrifugal charging pump is in operation, charging flow will increase due to failure of FT-62-93 opening FCV-62-93 and an increase lh seal injection flow will occur'.

3.

Loss of power to Solid State Protection system output relays (Train B) and Channel II input relays (Trains A and B).

4.

If pressurizer level is selected to LT-68-335 for control, pressurizer low level auto actions will occur.

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SQN j

A01-25.2 i

Page 2 Revision 5

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SYMPTOMS (Continued)

C.

System Partial Failures (Continued) 5.

If Pressurizer Press. is selected to channel PT-68-334 the sprays will be closed and back-up heaters energized until locked-out by low level signal if LT-68-335 was selected for

. l-level control.

6.

Loss of Automatic control in AFH System of LCV-3-148, 171 I-(Level control for steam generators 3 and 4) for motor I

driven AFH pump 1B-B.

7.. Loss of Automatic control in Auxiliary Feed System of 1

LCV-3-173, 174 (Level control for steam generators 1 and 2) for turbine driven AFH pump 1A-S.

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' NOTE:

The above failures are of greatest immediate consequence, for complete loads list of vital board 1-II see Appendix A.

II. AUTOMATIC ACTIONS A.

Possible reactor trip due to low-low S/G 1evel.

III.

IMMEDIATE OPERATOR ACTIONS A.

None IV.

SUBSEQUENT OPERATOR ACTIONS A.

If reactor trip occurs then refer to emergency instructions.

B.

If reactor oces not trip, then, at the NIS panel, defeat the PR rod stop.

C.

Assume and maintain manual rod control as required.

NOTE:

Do not use bank select, use of bank select will cause the bank overlap program to be lost.

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Olspatch operator to restore power to failed board (transfer to D.

auxiliary power supply).

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SQN A0I-25.2 Page 3

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Revision 5 IV.

SUBSEQUENT OPERATOR ACTIONS (cont)

Assume Manual control of steam generator water level on the E.

affected steam generators.

F.

Verify Positive Displacement charging pump is not in service since speed controller is failed, shift charging to centrifugal r

pump if necessary.

Transfer control of FCV-62-93 to Auxiliary

[.

control room.

G.

Verify Pressurizer Level and Pressure are not selected to l

LT-68-335 and PT-68-334.

H.

If power is restored to the failed boards, return systems to normal operating mode.

NOTE:

Oue to feedback signals and time delays in circuitry, controllers may not control immediately.

I.

Evaluate need to shutdown per T.S. 3.8.2.1 if power cannot be restored to the affected board.

If necessary, commence orderly

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shutdown to the hot standby condition per GOI-5 and G01-3.

Initiate REP pr IP-1 (Engineered Safety Features) as required.

Refer to TS 3.8.2.2.

NOTE:

Operation may be continued at the discretion of the Manager, Operations Group, with respect to l

Tech. Spec. section 3.

t 1.

If shutdown is to continue to mode 5, follow GOI-3 with exception:

74-2 valve will require placing Bkr. transfer switch to Aux. to open valve when RCS pressure is below 380 psig.

2.

Transfer FCV-74-28 to aux. incide if B train RHR is' required

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for cooldown.

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j V.

REFERENCES l

A.

TS 3.8.2.1, 3.8.2.2 B.

SOI-55 Series C.

45N706-2 4

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SQN AOI-25.2 Page 4 Revision 5 APPENDIX A Page ' of 1 Load List: 120V AC Vital Inst. Power Bd. I-II SSPS (A) CH II input relays (1-R-46)

SSPS (B) CH II input and train B output relays (1-R-51)

NIS instr. power CH II NIS control power CH II Process protection set II (1-R-5)

UHI accumulator CH II isol. valve FCV-87-22 ERCH and containment rad. monitor 0-RE-90-134, 1-RE-90-112 Instrument Bus B Aux. relay rack SSPS aux. relays (1-R-78)

RB isol. valve FCV-32-102A, 102B Aux. compressor B, AB isol. valve FCV-32-85

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Rad. rate meters and 1-RI-90-112 Rad. monitor 0-RE-90-126 125V de vital battery board II instruments i

Chlorine detector CLAN-43-205B l

Post accident sampling solenoid valves PC0-65-83 and 87 aux. relays (1-R-78)

Toilet, locker, spreading, and cont rooms isol. dampers FCO-31A-102,104 l

FCV-31A-106A, 106B (1-R-78)

B0P process instr. control rack (1-R-131)

AB instr. Bus B 0-FCV-12-79 Containment purge air exhaust rad. monitor 1-RE-90-131 NSSS aux. relay rack, 8 bus (1-R-55)

Aux. relay rack sep. and aux. relays (1-R-78)

Aux, control panel, B relay bus Aux. control panel, B instr. bus Reactor vessel level instrumentation system (1-R-148)

Aux. dryer Train B

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Aux. relay rack sep and aux. relays (1-R-77)-

BAT A htr. B-B controller TIT-62-245 AB gas treatment fan B-B press. controller BAT C htr. B-B controller TIT-62-246 Rad. monitor 0-RE-90-206 RCP 2 UV and UF relays Process control group 2 (1-R-17)

Instrument bus 2 (0-M-278)

Plugmold instr. bus 2 (1-M-3, 1-M-6)

Acoustic flow monitoring Fire pump 2B-B sep. relays AB general exhaust fan IB flow controller UHI instr. bus 2

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0150H/ SAT /deh

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