ML20138J098

SPDS Man-In-The-Loop Validation Scenarios

ML20138J098
Person / Time
Site:	Millstone
Issue date:	10/31/1985
From:	NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20138J066	List: A05244, Forwards Response to 850910 Request for Addl Info Re SPDS, Including SPDS Operator Training Program Outline for Man-In-The-Loop Validation & SPDS Man-In-The-Loop Validation Scenarios ML20138J062 ML20138J092 ML20138J098
References
NUDOCS 8510290249
Download: ML20138J098 (8)

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Docket No. 50-423 Attachment No. 3 Millstone Nuclear Power Station, Unit No. 3 SPDS Man-in-the-loop Validation Scenarios Y

r510290249 851016 PDR ADOCK 05000423 F PDR October,1985 L

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SPDS MAN-IN-THE-LOOP VALIDATION SCENARIOS A' - 4 Inch Cold Leg Break with No High Head Safety Injection B -

' Steam Line Break Inside Containment with all Main Steam Isolation Valves Failing to Close and Main Feedwater Failing to Isolate.

C -

Small Steam Generator Leak Simultaneous with Loss of Offsite Power and Subsequent Steam Generator Tube Rupture.

D -

Rupture of Two Main Steam Lines Outside Containment with all Main Steam Isolation Valves Falling to Close and Main Feedwater Falling to Isolate.

E -

Anticipated Transient Without Trip with Loss of All Feedwater ar:d

- Subsequent Pressurizer Manway Leak.

F -

Rod Ejection During Startup with Plant Failing to Trip.

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SCENARIO A INITIAL CONDITIONS: 100% Power, EOL FAILED EQUIPMENT: ' Charging Pump B out of service Sequencer in Train B out of service FAILED INSTRUMENTS: PZR' level RCS-P456 failed high RCS Cold Leg C Temp. RCS-T433B failed high SG 2 Level FWS-L528 failed low SG 3 Press. MSS-PS35 failed low INITIATING EVENT: 4 inch cold leg break on loop B SIMULTANEOUS FAILURES: No high head safety injection CTMT Spray fails to auto actuate Loss of 4160 Bus 34C SUBSEQUENT FAILURES: None

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SCENARIO B INITIAL CONDITIONS: 100% Power, EOL FAILED EQUIPMENT: . Charging Pump B out of service FAILED INSTRUMENTS: SG 3 level FWS-L538 failed high ,

FW to SG3 flow FWS-F530 failed low RCS Pressure RCS-P403 failed high INITIATING EVENT: Steam Generator 3 steam line break inside CTMT SIMULTANEOUS FAILURES: All MSIVs fail to close

, . Main FW falls to isolate SUBSEQUENT FAILURES: SG3 Level FWS-L537 fails high i

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SCENARIO C INITIAL CONDITIONS: 100% Power, EOL; 5% failed fuel FAILED EQUIPMENT: Diesel General A out for maintenance Charging Pump A out of service FAILED INSTRUMENTATION: None

.INTIATING EVENTS: SGI Tube Leak of 5 GPM Loss of Offsite Power SIMULTANEOUS FAILURES: None SUBSEQUENT FAILURES: RCS Cold Leg A Temp. RCS-T4138 falls low SGI Tube Rupture of 1 KGPM Diesel Generator B Trips _,

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SCENARIO D -l l

INITIAL CONDITIONS: 3% Power, BOL FAILED EQUIPMENT: None FAILED INSTRUMENTS: None at start of scenario SG 2 Level FWS-L527 drifts to 6% prior to initiating event .

INITIATING EVENT: Main Steam Line 2 rupture outside CTMT of SE6LB Main Steam Line 3 rupture outside CTMT of 5E6LB SIMULTANEOUS FAILURES: MSIVs fail to close Main FW fails to isolate SUBSEQUENT FAILURES: SGI Level RWS-L519 fails high

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. SCENARIO E INITIAL CONDITIONS: 100% Power, BOL; All rods in FAILED EQUIPMENT: Charging Pump A out of service FAILED INSTRUMENTS: None at start of scenario Main FW to SG3 FWS-F330 fails low INITIATING EVENT: Anticipated Transient Without Trip SIMULTANEOUS FAILURES: Loss of all Feedwater SUBSEQUENT FAILURES: PZR Manway leak of 1.3 E5 LB W

o#3 SCENARIO F INITIAL CONDITIONS: Approx.101 on source range; BOL; Pulling rods manually to startup plant

. FAILED EQUIPMENT: Steam Dump Setpoint greater than 1090 PSIG FAILED INSTRUMENTS: None at start of scenario SG 3 pressure MSS-P535 fails to 650 PSIG INITIATING EVENT: Rod ejection SIMULTANEOUS FAILURES: None SUBSEQUENT FAILURES: None e

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