ML051460162

Sequence of Events from Crew Debrief, Unit 3 Reactor Trip on 04/17/2005

ML051460162
Person / Time
Site:	Millstone
Issue date:	04/18/2005
From:	- No Known Affiliation
To:	Office of Nuclear Reactor Regulation
References
FOIA/PA-2005-0207
Download: ML051460162 (8)

Text

APR-18-2005 13:38 MILLSTONE 860 443 5893 P.06

,.',~ ' f" Sequence of Events from Crew Debrief Unit 3 Reactor Trip on 04/17/05 Time Event / Condition Source Activities CMS22 sample was being taken prior to trip. Kelly prior to trip Exited action at 08:11. Routine rounds by PEOs and Control Room operators were in progress.

08:29 U3 Reactor trip RO - Frechette 'A First out - Stearnline Press Lo SI Lots of Annunciators

.__ _ Rods on bottom per DRPI .

Initial Red Indication was observed for PZR Safety Frechette.

Observations Reliefs. RCS pressure was not observed to go above 2350. Observed PORVs open indicating lights and pressure decreasing. _

Initial Saw PZR pressure cycling but no indicating lights Franks.

Observations on PORVs.

Initial Saw PZR SafetyRelief open indication, PZR Smith.

Observations pressure cycling, but did not see PORV indicating lights cycling.

Initial Saw PZR pressure cycling at PORV set pressure. Socha Observations Initial Control Room entered E-0. No problems during US Debrief *,

Observations steps 1 through 3.

Initial Step 4 of E-0, Check SI actuation. Observed only US Debrief Observations group 2 ESF status lights lit. Manually actuated B train SI.

Initial E-0 Step 16 brief identified no Terry Turbine Aux US Debrief Observations Feed flow, B and C SG safeties had lifted, PORVs opened, PZR safety relief red lights, and for the MSI kickout, had to perform manual initiation, PEO Terry Turbine not running. Found V5 unlatched Sibilia Observation and shut. Mech Trip tappet was not down.

08:40 Manual MSI US debrief I - I _ .. __ I Event Debrief.doc 1 of 8 04/18/2

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Sequence of Events from Crew Debrief Unit 3 Reactor Trip on 04/17/05 08:42 Alert Cl declared US debrief 08:42 Observed PZR code safeties indication. Also noted tailpipe temperatures high.

08:49 Message released US debrief 08:50 SIG safeties seated US debrief 08:50 Judgment call - possible E-2 transition, decided SI US debrief termination more important, transition not made to E-2 based on uncontrolled SG pressure decrease, which crew felt was not occurring.

08:51 Message sent US debrief 08:54 Determined no SG tube rupture based on SG level SM debrief trend, E-0 step.

08:56 B SG safety relief noticed open again. SM debrief -

08:56 Water noticed on Aux Bldg floor. PEO report Sibilia significant packing Icaks on V 661 and MV 8511 B.

08:59 Transition from E-0 to ES 1.1. Kelly PEO Report Dispatched to observe SG safeties. First saw steam Morgan flow from B SG safety, then C SG. Very cloudy, Observed flow from 74D and A SG safety had a small plume of steam.

B and C SG safeties were definitely open, 09:02 PEOs were dispatched to 32-3T to re-energize. Smith.

Report from PEO that 32-3T Alt Source supply Beradi light was not lit. Had to replace bulb. Also,the precharge pushbutton appeared to stick.

09:04 Leak flow through CHS*V661 and MV851 1B SM debrief.

terminated 09:05 Observed Thermal Barrier valves closed on two Prechette.

RCPs. Could not reopen at first based on no Instrument Air to Containment. Were reopened later.

Event Debrief.doc 2of 8 0411 8/2005

F1PR-18-2005 13:38 MILLSTONE 860 443 5893 P.08 Sequence of Events fom Crew Debrief Unit 3 Reactor Trip on 04/17/05 09:15 Terninated SI per ES1.1. Swapped to B Charging Socha later and shut V 659 (at 10:30), V 663 was already closed.

09:15 Letdown flow reestablished US debrief 09:15 No precharge light on Inverter 6. SM debrief 09:20 Normal Letdown reestablished. SM debrief.

09:20 SM discussing plant conditions with TSC. SM debrief 09:20 SM relieved of CRDSEO and became MCRO. SM debrief.

09:23 Duty Officer called NRC. SM debrief 09:45 Shutdown both EDGs. Socha.

09:50 Field report that the SG Safeties were closed. SM debrief 09:53 Report from Chemistry that SG A, B and C had no SM debrief.

activity. Could not get sample from D SG.

09:55 SM signed updated message. SM debrief.

Crew Report that MSS*V5 was reset but no log time on SM debrief Comment this._

10:00 RX trip on D SG low level came in but was SM debrief restored.

10:00 Aux building filter fire alarm came in. Reported SM debrief.

running with no discharge path. Filter was shutdown. It was concluded at the time that this did not impact Operability of SLCRS or Aux Building Filters.

10:00 FR 1-1 guidance was used for PZR level control SM debrief.

and to re-establish a bubble.

10:05 Swnpped to B charging, SM debrief.

10:08 RCS pressure was 2050 PSIA and rising. SM debrief.

Event Debrief.doc 3 of 8 04/18/2005

APR-18-2805 13:38 MILLSTONE 860 443 5893 P.09 Sequence of Events from Crew Debrief Unit 3 Reactor Trip on 04/17/05 10:08 Action to manually place turbine on turning gear. SM debrief.

10:08 Pumping and cooling the PRT. SM debrief.

10:15 Decision not to use containment vacuum pumps. SM debrief.

10:15 PZR level came back on scale. SM debrief.

10:15 Due to concern over action statement on SM debrief Containment pressure, evaluated starting Containment Vacuum pumps to lower pressure, but decided not to due to concerns that the PRT rupture disk may have ruptured.

Crew Due to MSI, we did not have the PV20s for post SM debrief.

Comments trip cooling. SG pressure was down close to 1000 psig. Had MSS*74s open to relieve steam to get SG Safety Reliefs to reseat.

Crew Did not expect the small RCS temperature changes Frechette.

Comments we were experiencing to have the large effect on PZR level that we saw.

Crew Backed off on the MSS 74s and puffed the SG SM debrief.

Comments Safeties again.

Crew SG Safeties appeared to be lifting at low pressures. Noniewicz.

Comments 10:19 MSS*V5 opened and Terry Turbine now running. SM debrief.

10:25 Turbine Turning Gear energized. SM debrief.

10:25 Terry Turbine running. SM debrief.

10:30 Charging system leakage isolated. SM debrief 10:32 CHS*V659 shut to isolate leaks. SM debrief.

10:39 Loading charger 9 on Bat 6. SM debrief.

10:43 B CDS Chiller did not auto restart. Tripped on low SM debrief.

condenser pressure when CCP flow restored. C I Event Debrief.doc 40f 8 04/18/2005

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Sequence of Events from Crew Debrief Unit 3 Reactor Trip on 04/17/05 CDS Chiller restarted automatically.

10:44 DWST Level low TS 3.7.1.3 SM debrief.

10:44 A AMx building filter shut down. . SM debrief.

11:00 Discussed with EOF on which Tech Specs we should be in and actions..

11:01 Focus brief- pump PRT, RCS samples, Ionics, SM debrief.

stabilize PZR level 50 to 85%, Action to stabilize the plant and where we are going.

11:10 LCO times discussed SM debrief.

11:20 Discussion on allowed time to shutdown per TS SM debrief.

3.7.1.1 Action a. Might have only 3 '/z hours to cooldown or the full 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. Decided this was not AOT time and can credit the full time allowed.

Discussion included Sarver, Semancik and Smith.

11:32 Started looking at shutdown margins SM debrief 11:32 Energized SR audio count rate. SM debrief.

11:37 Max CHS flow. SM debrief.

11:43 Stopped RCS cooldown. Maintain at 550 to 560 F. Noniewicz Relying on MSS*74D, had no preference, this was working so I stayed with it. There was a concern over limitation on cycling the 74s and the limit of 7 cycles for the thermal overloads.

11:51 Shut down the aux building filter. SM debrief.

12:05 PRT filled to 65 to 85% for cooling. SM debrief.

PEO Report SJAEs had a small leak, pencil stream. Beradi.

12:19 Spoke with Doug McCracken on updating ISONE SM debrief 12:26 Verified with Chernistry the required RCS boron SM debrief.

and activity samples for power changes> 15%.

Chemistry reported RCS boron was 912 at 11:42.

Event Debnef.doc 5 of 8 04/l18/2005

MILLSTONE 860 443 APR-18-2035 13:38 FPR-18-2O5 13:38 M ILLSTONE 860 443 58Y-Ji H . 11 Sequence of Events from Crew Debrief Unit 3 Reactor Trip on 04/17/05 12:30 _ B CDS Chiller started. SM debrief.

12:57 Transition to OP 3208. Christianson 13:01 ADTS concurred on transition to OP 3208. Socha.

Crew Became accustomed to SG Safeties opening, SM debrief.

Comment Complacency on believability of valve indicators and sending PEOs out to confirm steam release.

Did not send PEOS out every time.

14:05 Problems encountered with taking care of SM debrief.

Condensate. Cal Ackley took over control of shutting down the secondary pl1ant.

Crew Had to swap RCP Seal Injection filters due to SM debrief.

Comment clogging. Expected response but aggravated the situation.

14:50 Decided to use CHS-HCV182 to throttle seal flow SM debrief.

vs sending PEO out to locally do this. Got valve 1/4 closed then sent PEO out and reopened 182.

14:50 Required boron concentrations and TS reviews SM debrief.

continuing.

Crew NOPs were not clear. OP 3208 prereqs, initial SM debrief.

Comments conditions, etc, due to entry from ES 1.1. Had to go back to OP 3206 and 3207 to decide what additional actions had to be performed.

Crew Problems with numerous requests from Chemistry. SM debrief Comments I Crew Not having CTV 19D available complicated SM debrief.

Comments Chemistry sampling.. 19A was also closed but chemistry was able to get a sample before it closed.

As'a result of all of this, we were not able to get an activity sample on the D SG. Did not initially consider impact of this while cooling down with 74D, Crew MSIV bypass valves were tagged closed, could not SM debrief, Event Debrief.doc 6 of 8 C14/1l82005

868 443 5893 P.12 j3:39 MILLSTONE APR-18-2005 APR-18-2005 13:39 MILLSTONE e60 443 5893 P. 12

-Sequence of Events from Crew Debrief Unit 3 Reactor Trip on 04/17/05 Comments restore steam flow to the condenser.

Crew D RCP was shutdown per cooldown proc. SM debrief.

Comments Crev Problems with the datalogger in obtaining SM debrief.

Comments temperatures.

Crew Aux boiler tripped. B was started first, then A. Beradi Comments Could not get it to press up. Isolated steam to Unit

2. Confusion over steps in procedure and what to do with V5 1.. Discussed with Ray Martin. May need procedure work and develop a GA for use in EOP space.

Crew Problems opening Control Room door. Air banks Morgan Comments were blowing down due to CBI. Had to enter from the Equipment room above and through the back stairs.

Crew Announcement of the trip was made via page on Socha Comments 810. Could not be heard in all locations.

Crew No procedural guidance on long recycle for SM debrief.

Comments Condensate. Could not reject. ES 0.1 has answers but we were not in that procedure.

Crew Had a problem getting EDRS activated. Semancil:

Comments-Crew Lost CCP flow to two RCPs, but not the other two, SM debrief.

Comments not sure why.

Crew Had to manually rearm turbine lift pumps. SM debrief.

Comments Crew Need to check the Tech Specs on RCS relief valves SM.debrief Comments before we go back up.

Crew Did not have speed wrench to operate manual Lamothe Comments valves. We had 6 PEOs and we were challenged.

Crew B and C SG Safeties lifted based on MB indication SM debrief.

Comments Event Debriefdoc 7 of 8 04/18/2005

APR-18-2005 13:39 MI LLSTONE 860 443 5893 P.13

' I, Sequence of Events from Crew Debrief Unit 3 Reactor Trip on 04/17/05 Crew Red lights on PZR safeties based on acoustics. SM debrief Comments Crew Need to determine what SI check valves had SM debrief, Comments forward flow through them, use real time.

Crewv No injuries were reported. SM debrief.

Comments Crew There was no review of EAL for reclassification Smith.

Comments when Charging leak through V661 and RV85I lB, e.g., RCS leak in aux building. Alert Cl based on Stuck open SIR outside Containment.

Crew Various steps in ES 1.1 could not be completed SM debrief.

Comments before transition to OP 3208. Treated as steps in progress, need to review these. -

Crew Had 1st out MS Press SI locked in, did not want to SM debrief.

Comments reset. Wait until clear before doing other stuff.

Event Debrief.doc 8of 8 (14/l 8/2005 TOTAL P.13