ML022630065

Scenario Outline, VC Summer Scenario No. 2 Plant Operating at 90% Power B Train Equipment in Service

ML022630065
Person / Time
Site:	Summer
Issue date:	09/16/2002
From:	- No Known Affiliation
To:	Office of Nuclear Reactor Regulation
References
FOIA/PA-2002-0371
Download: ML022630065 (11)

Text

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~~J~.JScenari Outline Form ES-D-1 Facility: _VC SUMMER Scenario No.:

2 Examiners:

G. HOPPER__

L. MELLEN M. SYKES Op-Test No.:._99-1 Operators:

Objectives:

Initial Conditions: PLANT OPERATING AT 90% POWER. 'B' TRAIN EQUIPMENT IN SERVICE. PCV-445A HAS BEEN ISOLATED DUE EXTERNAL LEAKAGE.

HEAVY THUNDERSTORMS IN THE AREA Turnover: PCV-444B HAS MINOR SEAT LEAKAGE. 'A' TRAIN COMPONENT COOLING PUMP OOS SERVICE FOR MAINTENANCE (CLEARING TAGS) 30 GPD LEAKAGE ON 'A' S/G.

Event Malf. No.

Event Event No.

Type*

Description I

CRF-008 I-RO T-REF FAILS LOW (SEVFJVTY=557, RAMP=-5) 2 TUR-007B C-BOP LOSS OF STATOR COOLING (SEVERITY=.35, RAMP=120)

PCS-002 R-Al FAILURE OF AUTOMATIC RUNBACK (SELECT=RUNBACK FAIL) 3 CVC-015A C-RO LETDOWN PRESSURE CONTROL VALVE PCV-145 FAILS CLOSED (AUTO)

(SEVERITY=O, RAMP=5)

CVC-020 LETDOWN RELIEF VALVE FAILS OPEN (SET=FAIL AFTER LIFTING)

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4 N-RO PLACE EXCESS LETDOWN IN SERVICE 5

MSS-001B I-BOP

'A' S/G PRESSURE XMITTER PT-475 FAILS LO (SEVERITY=O, RAMP=5) 6 RCS-002A

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'A' S/G TUBE LEAK INCREASE (SEVERITY=2.5. RAMP=120) 6A PLP-CND-001 C-ALL DECREASING MAIN CONDENSER VACUUM (SEVERITY=3500, RAMP=120)

R-ALL COMMENCE POWER REDUCTION (IF NECESSARY) 7 MSS-004B M-ALL MAIN STEAM LINE BREAK AT COMMON TDEFW HDR (SEVERITY=5E5, RAMP=60)

MSS-004C MAIN STEAM LINE BREAK AT COMMON TDEFW HDR (SEVERITY=5E5, RAMP=60 VLV-MS-009P

'C' ISOLATION VALVE TO TDEFP (2802B) FAILS OPEN(SEVERITY=100)

VLV-MS037P TDEFP LOW SPEED FAILURE (SIMULATES LOW STEAM FLOW TO TDEFP) (SEVERITY=15)

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Scenario Outline

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a Appendix D Operator Actions Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

1 Page 1

of 1

Event

Description:

TREF Fails Low Time Position Applicants Actions or Behavior RO Verifies Rod Motion not required.

Verifies TREF has failed.

",-/;,*'

Places ROD CNTRL BANK SEL switch in MAN.

Adj usts Rods to maintain TAVE within I°F of TREF (if necessary).

"Performs actions of'AOP-403.3 as directed by CRS.

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a Appendix D W

Operator Actions Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

2 Page 1

of I

Event

Description:

Loss of Stator Cooling Failure of Automatic Runback Time Position Applicants Actions or Behavior BOP Acknowledges GEN AUX PNL TRBL annunciator.

S, Breaks out ARP.

Dispatches TB Operator to investigate GEN AUX PNL TRBL alarm.

When TB AO reports back that PROTECTION CIRCUITS ENERGIZED local annunciator in alarm, recognizes a runback should be in progress.

Reduces Turbine Load using the LOAD LMT SET.

Drives in rods manually and/or uses emergency boration to attempt to maintain TAvE - TREF within I°F and keep Bank D rods above rod insertion limits.

-1BOP Stops manual load reduction when TB AO reports stator cooling has been restored.

'O Uses rods/boration to maintain TAvE-TREF within 1 *F.

BOTH Performs actions of AOP-214.2 as directed by CRS.

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Appendix D W

Operator Actions MW Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

3 Page 1

of 1

Event

Description:

Letdown Pressure Control Valve PCV-145 Fails Closed (AUTO)

Letdown Relief Valve Fails Open.

Time Position Applicants Actions or Behavior RO Recognizes PCV-145 has failed closed.

Takes manual control of PCV-145 and opens PCV-145.

Determines letdown relief valve has failed open by PRT pressure/temperature increasing, PRT annunciator, or letdown relief tailpipe temperature not decreasing.

Isolates Letdown 0 Closes PVT-8149A

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• Closes PVT-8149C C16ses LCV-459 Cjosed LCV-460 Isolates Charging a Places FCV-122 in Manual

• Closes FCV-122 0 Closes MVG-8107 (optional)

Closes MVG-8108 (optional)

Takes actiori of AOP-102.1 as directed by the CRS.

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Operator Actions 14 Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

4 Page 1

of 1 Event

Description:

Place Excess Letdown in Service

[ Time Position Applicants Actions or Behavior RO Verifies core power < 2898 MWt.

Places PVM-8143 to VCT position.

Opens MVT-8100.

Opens MVT-8112.

Z Opens PVT-8153.

2 Opens PVT-8154.

SlowJy throttles open HVC-137.

Maintains XS Letdown HX temperature < 165TF (TI-139).

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i Appendix D l

Operator Actions Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

5 Page 1

of 1 Event

Description:

'A' S/G Pressure Transmitter (PT-475) Fails Low

[ Time Position Applicants Actions or Behavior BOP Recognizes PT-475 failed low.

Takes manual control of 'A' Feed Reg Valve FCV-478.

Opens FCV-478 so feed flow > steam flow in 'A' S/G.

Places FW CONTROL CHANNEL SEL switch to the FY 475A position.

7 Places STEAM CONTROL CHANNEL SEL switch to the FY 476A position.

.j Restore 'A' S/G level to

• 61%.

X +/-

Place FCV-478 in automatic.

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Operator Actions Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

6 Page 1

of 1 Event

Description:

'A' S/G Tube Leak Increase Time Position Applicants Actions or Behavior RO Acknowledges RMG-19A Annunciator Takes actions of ARP-XCP-646 (2-1) 07 S

Requests HP to survey Steamlines A

S/RO 0 Directs Chemistry to sample S/Gs for activity o// RO/BOP s

Have TB AO verify Condenser Exhaust aligned to AB Charcoal Exhaust.

BOP

• Have AB operator reduce 'A' S/G Blowdown flow to minimum.

Takes actions of AOP-102.1 RO/BOP/

0 Determines RCS leak rate by performing STP-1 14.002 on

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, BOP 0 Adjust PW1ý PZR A SETPT Controller to 8.85 RO/BOP When directed by CRS, commence plant shutdown I

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Appendix D Operator Actions Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

6A Page 1

of 1 Event

Description:

Decreasing Main Condenser Vacuum Power Reduction Time Position Applicants Actions or Behavior BOP Recognizes decreasing Main Condenser Vacuum.

Opens MVB-102A or 102B and starts 'C' Main Condenser Vacuum Pump.

Trips turbine if load < 300 MWe (with vacuum > 5" Hg).

Appendix D Operator Actions Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

7 Page 1

of 3

Event

Description:

Main Steam Line Break at Common TDEFP Header Time [

Position I Applicants Actions or Behavior q# (

RO/BOP Recognize indications of Main Steam break

• Reactor power increasing

'B' & 'C' SIG levels increasing

• 'B' & 'C' FRV opening

• Report from AB operator RO/BOP Trips reactor if/when directed by CRS.

2.7-G OOP Closes MSIVs when directed by CRS.

RO

, 6kes immediate actions of EOP-1.0 Verifies reactor trip

• Manually activltes SI (back-up signal)

BOP Pakes immediate actions of EOP-1.0 Verifies turbine trip

• Verifies ESF buses energized f__________

Z Manually activates SI (back-up signal)

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-.5-OP/RO Recognizes high steam flow in 'B' & 'C' S/G.

BOP/RO When high stea ow recogýjd, may recommend to CRS to close MVG-28LA

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and 2802.B<*

Performs Attachment 3 of EOP-1.0 to verify proper operation of all ESF equipment.

• Matches flags on running equipment if not already done

Appendix D Operator Actions Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

7 Page 2

of 3 Event

Description:

Main Steam Line Break at Common TDEFP Header Time I Position ApNpticants Actions or Behavior BOP/RO Closes MVG-28ffA and 2802B when directed by CRS.

BOP/ROO, Recognizes 2802B did not close and steam flow on 'B' S/G went to 0 mpph.

BOP/RO//

Directs IB operator to locally close 2802B (if inhabitable).

SRO Crew transitions to EOP-3.0, Faulted Steam Generator Isolation.

BOP Performs isolation of 'C' S/G.

a Closes MVK-1633C (RO) 0 Closes PVT-2843C 0 Closes PVT-2877B

• Places 'C' Power Relief to PWR REL a

Closes FCV-3551 0 Closes FCV-3556 9 Directs AB operator to close 1017C, 1018C, 1019C, 1020C 0 Close MVG-2802A and 2802B (if not already done) 0 Directs IB operator to deenergize MVG-2802A and MVG 2802B SRO Verifies high radiation on 'A' S/G and transitions to EOP-4.0, Steam Generator Tube Rupture.

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Appendix D Operator Actions Form ES-D-2 Op-Test No.: 99-1 Scenario No.:

2 Event No.:

7 Page 3

of 3 Event

Description:

Main Steam Line Break at Common TDEFP Header Time Position Applicants Actions or Behavior BOP Isolates flow from 'A' SG 0 Adjusts Power Relief Setpoint to 8.85 and places in PWR REL.

• Places STM DUMP INTERLOCK switches to BYP INTLK 0 Closes PCT-2843A 0 Closes PVT-2877A BOP Isolates flow to 'A' SIG.

Closes FCV-3531 (if'A' S/G NR level> 30%)

0 Closes FCV-3536 (if'A' S/GNR level > 30%)

SRO Determines required core exit TC temperature and controller setpoint based on 'A' S/G pressure. Informs RO/BOP of those valves.

BOP Dump steam from 'B' S/G (also 'C' S/G if MVG-2802 closed locally)

• Blocks steamline SI

• Opens 'B' S/G power relief

• Closes 'B' SIG power relief and adjust setpoint when target temperature reached.

RO RESET SI, Phase A, Phase B, BOP Reset ESFLS RO Establish Instrument Air to RB Opens PVA-2659 Opens PVA-2660

• Directs TB operator to reset 'A' IA compressor