ML13246A374

Email from M. King, NRR on Ioeb Clearinghouse Screening Summary for Tuesday, January 17, 2012

ML13246A374
Person / Time
Site:	Wolf Creek
Issue date:	01/17/2012
From:	Mark King Office of Nuclear Reactor Regulation
To:
References
FOIA/PA-2013-0273
Download: ML13246A374 (3)

Text

.0'NRobles, JesseFrom: King, MarkSent: Tuesday, January 17, 2012 3:01 PM

Subject:

IOEB Clearinghouse Screening Summary for Tuesday, January 17, 2012~~~NOTE:

S Y IS OFFICIAL

-***MA CONTA SENSITIV PROPRIETARY NRCINTERN USE 0 Y INFOR ATIDO N FORWARD TIONS OUTSIDE OF NR 0 FIRST OBT PERMI SIONFROM ORIGINATOR Follow-uplOther Tasks: Eight (8)[Note -The information in this part of the Summary is often preliminary in nature and is provided to help IOEBstaff communicate and track noteworthy items being followed up by either the Regions or HQ staff.]Outside of Scope Outside of Scope8) EN 47590 -WOLF CREEK: NOTIFICATION OF UNUSUAL EVENT (NOUE) AND REACTOR TRIP DUETO LOSS OF OFFSITE POWER UNUSUAL EVENT -(NOUE TERMINATED)

See EN text: (Additional information) unit is currently in a stable condition (MODE 5). Unit obtained a safeshutdown condition and is currently stable in (MODE 5). Region performing an MD 8.3 reactive inspection riskevaluation.

The following is a list of post trip occurrences:

'Root Cause not well defined (licensee continues to investigate)

• Both 'A' & 'B' EDGs started/assumed safety loads'Decay heat removal via ASDs (atmospheric steam dumps)'Pressurizer PORV actuation (Residents following up on this indication)

• MDITDAFW Pumps functioned as expected'Essential Service Water (ESW) system experienced water hammer then subsequent leak in Containment Cooling (C) system'Containment cooling issue impacted 2 channels of source range detection (counts not tracking)

'Emergency mod to cut hole in Chemistry Building bulkhead to route power cable to restore Chem Lab(facilitated Boron sampling)

' Emergency mod to cut hole in Aux Building bulkhead to route power cable to sump pump (sump over flow dueto TDAFW steam discharge line)'Condensate Storage Tank (CST) makeup challenges when available Diesel Driven Fire Pump failed tooperate (Fire Truck staged as standby)'Facility lighting running on backup/emergency power'Train 'A' (vital) buses restored 1/2 hours after trip ('A' EDG secured)'Train 'B' (vital) buses supplied via 'B' EDG"'B' EDG air start (compressors) loss of power (EDGs remained functional)

"'B' EDG experienced a ground indication which cleared (Residents following up)'Switchyard:

Three offsite (345 KV) lines remained functional (grid not suspected as initiator)

'Switchyard:

Startup Transformer (SUT) oil samples were normal'Switchyard:

Startup Transformer (SUT) oil samples were normal-Switchyard:

345 KV breaker (60)/cabinet damage'Switchyard:

345 KV breaker/switch board inspections ongoing'Switchyard:

Work being performed on Unit Auxiliary Transformer (UAT) to backfeed

'B' buses; projected to becompleted today (1/17)-Switchyard:

Event recorder to track switchyard transients out of service at time of eventForward to TRG Leads for Electrical Systems (Mathew/Wolfgang).

I&C (Rahn), SSW/UHS (Purciarello),

EP(Schrader):

assigned to Russ Haskell.Outside of Scope2 Outside of Scope*(i. e., Screened/reviewed against LIC-401 criteria for initiating an "Issue for Resolution" (IFR), which is IOEB'sprocess for conducting further evaluation of an issue to determine what, if any, additional actions should betaken to communicate and organizationally learn from OpE.)NTAI NOTESH-P MMARY NSCOFNIC NAL U, SE ON LMAttendees at Screening Meeting:Mark KingBob BemardoRussell HaskellRebecca SigmonHarold ChernoffAl Issa, -NRODoug Copeland

-NROJay Patel -NROMary Wegner, RES -by phone3