ML20138J098
| ML20138J098 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 10/31/1985 |
| From: | NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML20138J066 | List: |
| 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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