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Category:Legal-Exhibit
MONTHYEARIR 05000271/20120082012-04-20020 April 2012 Official Exhibit - NYS000462-00-BD01 - IR 05000271-12-008; 1/9 - 13, 1/23 - 27, and 3/19 - 20/2012; Vermont Yankee Nuclear Power Station; Post Approval Site Inspection for License Renewal 1P71003. ML15331A1572011-12-23023 December 2011 Official Exhibit - NYS000460-00-BD01 - Commitment Charge Process. IR 05000271/20110112011-12-22022 December 2011 Official Exhibit - NYS000459-00-BD01 - IR 05000271-11-011; 10/17/2011 - 12/11/2011; Vermont Yankee Nuclear Power Station; Review of License Renewal Activities. 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July 2008 Evidentiary Hearing ML0823304192008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing, New England Coalition Exhibit List ML0824904732008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Applicant Exhibit E2-29-VY, List of Drawings Provided to NEC in Discovery ML0823304172008-08-12012 August 2008 NRC Staff Exhibit List - Vermont Yankee Nuclear Power Station July 2008 Evidentiary Hearing ML0824904142008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Applicant Exhibit E2-02-VY, Fitzpatrick Jc ML0823304982008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Intervenor Exhibit NEC-JH_35, NRC, Safety Evaluation by the Office of Nuclear Reactor Regulation Related to Amendment No. 229 to Facility Operating License No. DPR-28 Entergy Nuclear Vermont... ML0823407342008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Intervenor Exhibit NEC-UW_20, Vermont Yankee Nuclear Power Station, PP7028: Piping FAC Inspection Program - FAC Inspection Program Records for 2005 Refueling Outage. (Corrected) ML0823407332008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Intervenor Exhibit NEC-UW_15, L. E. Hochreiter, Data Collection of Pipe Failures Occurring in Stainless Steel and Carbon Steel Piping, Nuce 597D - Project 1 (April 2005) (Corrected) ML0825303102008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Applicant Exhibit E4-17-VY, INPO Report OE-21421 (Dresden 3) ML0825303452008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Applicant Exhibit E4-08-VY, Flow-Accelerated Corrosion in Power Plants ML0823406782008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Intervenor Exhibit NEC-RH_02, Curriculum Vitae of Rudolf Hausler ML0825303692008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Applicant Exhibit E4-18-VY, NRC Exhibit NEC-JH_18 LRA A3 Fdw 02 at Lph Ppb ML0825303702008-08-12012 August 2008 Vermont Yankee July 2008 Evidentiary Hearing - Applicant Exhibit E4-19-VY, Effects of Chemistry on Corrosion-Erosion of Steels in Water and Wet Steam ML0825303182008-07-31031 July 2008 Vermont Yankee July 2008 Evidentiary Hearing - Application Exhibit E4-43-VY, Dr. Horowitz'S Checworks Presentation ML0823305252008-07-23023 July 2008 Vermont Yankee July 2008 Evidentiary Hearing - Intervenor Exhibit NEC-JH_43, PP7028 FAC Inspections 2004 Refueling Outage. 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Chang 2012-04-20
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SUBJECT:
0E20246 - Failure of Extraction Steam Bellows inside Condenser -
Clinton Power Station Abstract: CPS experienced a catastrophic failure of an Extraction Steam (ES) line bellows inside the condenser. Material from the bellows also caused a condenser tube failure.
Inspection of the ES lines and bellows in the condenser found significant FAC damage to the ES lines. The FAC damage was unexpected; the heat balance shows these ES lines carry superheated steam.
Reason for Message: CPS is submitting this NER to provide information on the ES line bellows failure. This message also provides information about FAC damage in lines previously thought to contain superheated steam.
Event Date:. February 17, 2005 Unit Name: Clinton NSSS/A-E: General Electric / Sargent
& Lundy Turbine Manufacturer: General Electric Maintenance Rule Applicability: Yes
Description:
On 2-17-05 the CPS main control room (MCR) received high water level alarms for 4B feedwater heater. The 4B heater extraction steam (ES) line isolation valve closed in response to the high level. Subsequently, on 2-20-05 the MCR received an alarm for high condensate conductivity indicating a condenser tube leak. The plant initiated a down power to locate and repair the condenser tube leak.
An analysis of the heater condition identified the potential for a failed bellows in the ES line going to the 4B heater. The 4B ES line is a twelve (12) inch line. On 2-22-05, CPS commenced a reactor shutdown and began a forced outage to investigate the bellows condition and make any needed repairs.
An inspection of the condenser found severe damage to the 4B heater ES line bellows. Additionally, three thirty-inch (30) bellows adjacent to the 4B ES line had damage. These three bellows supply ES to the #3 heaters. CPS'has six pairs of feedwater heaters with the #1 heaters being the lowest pressure/temperature heaters.
The 4B heater ES piping and bellows configuration consists of two 10-inch vertical sections of piping each with a single bellows that connects to the turbine exhaust. Downstream of the vertical bellows, both 10-inch lines connect into the 12-inch line through 45-degree elbows. The 12-inch line is a horizontal run that includes a double bellows with a segment of piping.
between these bellows. The bellows are stainless steel and the piping is carbon steel. The 3B ES lines are a similar configuration but have 20 and 30-inch piping. The heat balance shows these lines carry superheated steam.
The inspection of the 4B heater ES piping found holes in the horizontal portions of the piping and the connecting spool between the'failed bellows.
Examination of the inner piping and spool piece surfaces'fodiiadevidence Of significant FAC damage. -
Causes: FAC caused a through-wall hole in an expansion joint. The res1ilt'ing steam jet induced vibration of the expansion joint that-led-to high cycle fatigue failure.
071/2
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U.S. NUCLEAR REGULATORY COMIvvSSIUN IntheMatterof =7,=,, L Lie-L-,L DockeltNo.
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NRC Staff Other AdwTlm: : RLWMD WHOR
The FAC damage is the result of operating with saturated steam in the ES lines, rather than superheated steam. The saturated steam condition resulted from 1) condenser steam (120 F) cooling the top half of the horizontal portions of the ES piping such that the steam temperature inside the piping fell below superheated conditions and 2) operation with the MSR's out of service as well as reduced service.
Corrective Actions:
- 1. Include all extraction steam piping for the 3 A/B and 4 A/B feed water heaters into the FAC program.
- 2. Provide training to Operations and Engineering personal to explain the Root Cause results, FAC and program requirements to identify any changes in operations, chemistry or design whether due to procedure changes or equipment failure to the System Manager and the FAC engineer.
- 3. Propose a change to the Bellows PM templates to the peer group to review and clarify the "every outage' expectations.
- 4. Determine scope of extraction steam expansion joint and piping inspections/repairs for ClRI0 and future refuel outages and submit scope adds.
Information
Contact:
Bob Mundlapudi - ES System Engineer 217 937-3969Bmundlapudi@cps.amnergenenergy.com Paul Manbeck - FAC Program manager 217 937-3429manbeck@cps.amergenenergy.com">Pmanbeck@cps.amergenenergy.com DOCKETED USNRC August 12, 2008 (11:00am)
OFFICE OF SECRETARY RULEMAKINGS AND ADJUDICATIONS STAFF