ML051460304

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Attachment to April 17, 2005 Event Notification Summary of Event
ML051460304
Person / Time
Site: Millstone 
Issue date: 04/17/2005
From:
- No Known Affiliation
To:
Office of Nuclear Reactor Regulation
References
FOIA/PA-2005-0207
Download: ML051460304 (23)
v • d • e


Text

.?PR-17-2005 SUN 01:44 PM MP MANAGER PUBLIC INFO.

FAX NO. 860 437 2739 P. 04 5{'& ° Attachment to Apri 17,2005 Event Notification Summary of Event At approximately 0830 on April 17, 2005 Millstone Unit 3 experienced an automatic reactor trip from full power. The Reactor is in a stable shutdown condition and is proceeding to Mode 5 cold shutdown. No release of radioactivity other than those minor releases associated with normal plant operation has occurred. There were no personnel injuries associated with the event.

In addition to the Reactor Trip, half-train Safety Injection (SI) and half-train Main Steam Isolation (MSI) actuations occurred. Control room personnel were successful at manually initiating full SI and MSI. SI has since been terminated and RCS pressure control has been restored. Multiple steam line safety valves (MSSV) lifted with at least one MSSV indicating a failure to reclose. As a result, an ALERT was declared at approximately 0853 due to the failure of at least one MSSV failing to reclose. All MSSV's are currently closed. Auxiliary Feedwater (AFW) actuated automatically as expected, however; the turbine driven auxiliary feedwater pump (TDAFWP) tripped on start-up and was subsequently reset locally.r Both motor driven auxiliary feedwater pumps (MDAFWPs) operated as expected to maintain steam generator water levels. Due to the additional inventory injected to the Reactor Coolant System (RCS) as a result of the SI actuation, the pressurizer filled and a primary system safety valve (PSSV) actuated at a lower than expected pressure. All PSSV's are currently closed, however; there is indication of leakage past either a PSSV or Pilot Operated Relief Valve (PORV). Upon alignment of the Charging system to Refueling Water Storage Tank recirculation flow path, 2 valves had indication of packing leakage. Those packing leaks have been terminated.

The cause of the event is under investigation.

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APR-17-2005 SUN 07:27 PM EOF EF M

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to April 17, 2005 Event Summary of Event I P. 05 V/bdR7 ted time of the ALERT declarati one Unit 3 entered Mode 4 at app, event at Millstone Unit 3 was ter ler investigation. A recovery plal 04/17/2005 SUN 19:29 "TI/RX NO 9925] tOO5

APR-17-2005 SUN 01:47 PH MP MANAGER PUBLIC INFO.

(LVI 1S FAX NO. 860 437 2739 P. 09 tWDommnyw NEWS RELEASE Release # 1 Date:

04-17-2005 Informationasof:

10:49 4-17-2005 DOMINION DECLARES ALERT AT MIULSTONE POWER STATION WATERFORD, Conn. - An emergency was declared today at Millstone Power Station Unit 3. An Alert, the second lowest of four emergency classifications used by the U.S.

Nuclear Regulatory Commission, was declared at 8:42 am.

Unit 3 has been shutdown and is in a stable condition. Federal, state and local emergency response agencies have been notified. An Alert ensures that additional emergency response personnel are on standby and ready to respond if necdd.

No release of radioactive material has occurred beyond those minor releases associated with normal plant operations. These minor releases pose no danger to the public or plant workers. The minor releases are below federally approved operating limits, below natural background levels and can not be detected at the site boundary.

Further information about conditions at Millstone will be provided as it becomes available.

As part of the Millstone emergency response plan, an Emergency Operations Facility has been activated at the nuclear station in Waterford, Connecticut.

The Millstone Power Station is owned and operated by Dominion.

04/17/2005 SUN 13:46

[T0X/RX NO 99231 E 009

APR-17-2005 SUN 01:43 PH HP MANAGER PUBLIC INFO.

FAX NO. 860 437 2739 P. 02 NRC Event Notification Form (Sheet 1 of 2)

NRC CONTACT (NAME)

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NRCEVENTNUMBER: 4\\ &C07 NOllFICATION TIME FACILITY OR ORGANIZATION UNIT

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APR-17-2005 SUN 01:44 PM MP MANAGER PUBLIC INFO.

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FAX NO. 860 437 2739 P. 07 Incident Report Form (ERF) qOTE: FOR ANINITIAL CLASSIFICATION O A CL4SSIFICATION CHANGE, COMPLETE ITEMS 1-8, AND 13 & 14. FOR lJPDATEMESSAGE, COMPLETEALL ITEMS 1-14.

IRF Number:

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reac r p from fill power. The Reactor is in a sI s

own con and i$ p ceeding to Mode 5 cold shutdown. NO I lJe radi ty otie an those minor releases associate.will n'C arit ope has occx ed. There were no personnel inj ies otif Vitl the !It In.

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pressure control has been restore.

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lpres r AUl PSSV's are currently closed, IOW ;l S

in ti ni of lt ge-past either a PSSV or Pilot Ope

-te ci ye (P1?1 UTP pinment of the Charging system to e r

St {e lankeccuation flow path, 2 valves had in Ca I) i Ig lec e aIo e cldng leaks have been terninated.

u e of i eet is under investigation.

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[TX/RX NO 9923] f001

'PPR-17-2005 SUN 01:43 PM MP MANAGER PUBLIC INFO.

FAX NO. 860 437 2739 P. 02 NRC Event Notification Form (Sheet 1 of 2)

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GENERAL EMERGENCY TS Deviation (i)

TS Rcquirrd Shut-(ii)(A)

Degraded Condition down SITE AREA EMERGENCY

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APR-17-2005 SUN 01:43 PH MP MANAGER PUBLIC INFO.

FAX NO. 860 437 2739 P. 03 NRC Event Notification Form (Sheet 2 of 2)

NOTIPICATIONS YES NO WILL BE AYTHING UNUSUALOR NOT YES d NO Q UNDERSTOOD?

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NRC RESIDENT DID ALL SYSTEMS FUNC'lON YES 0 NO g

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99 of 115 04/17/2005 SUN 13:46 MTM/RX NO 99231 I003

APR-17-2005 SUN 01:44 PM MP MANAGER PUBLIC INFO.

FAX NO. 860 437 2739 P. 04 Attachment to April 17, 2005 Event Notification Suimmary of Event At approximately 0830 on April 17, 2005 Millstone Unit 3 experienced an automatic reactor trip from full power. The Reactor is in a stable shutdown condition and is proceeding to Mode 5 cold shutdown. No release of radioactivity other than those minor releases associated with normal plant operation has occuned. There were no personnel injuries associated with the event.

In addition to the Reactor Trip, half-train Safety Injection (SI) and half-train Main Steam Isolation (MSI) actuations occurred. Control room personnel were successful at manually initiating full SI and MSI. SI has since been terminated and RCS pressure control has been restored. Multiple steam line safety valves (MSSV) lifted with at least one MSSV indicating a failure to reclose. As a result, an ALERT was declared at approximately 0853 due to the failure of at least one MSSV failing to reclose. All MSSV's are currently closed. Auxiliary Feedwater (AFW) actuated automatically as expected, however; the turbine driven auxiliary feedwater pump (TDAFWP) tripped on start-up and was subsequently reset locally. Both motor driven auxiliary feedwater pumps (MDAPWPs) operated as expected to maintain steam generator water levels. Due to the additional inventory injected to the Reactor Coolant System (RCS) as a result of the SI actuation, the pressurizer filled and a primary system safety valve (PSSV) actuated at a lower than expected pressure. All PSSV's are currently closed, however; there is indication of leakage past either a PSSV or Pilot Operated Relief Valve (PORV). Upon alignment of the Charging system to Refueling Water Storage Tank recirculation flow path, 2 valves had indication of packing leakage. Those packing leaks have been terminated.

The cause of the event is under investigation.

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APR-17-2005 SUN 01:44 PH MP HANAGER PUBLIC INFO.

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APR-17-2005 SUN 01:45 PM MP MANAGER PUBLIC INFO.

FAX NO. 860 437 2739 P. 07 0

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FAX NO. 860 437 2739 To '666

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,APR-17-2005 SUN 01:47 PM MP MANAGER PUBLIC INFO.

FAX NO. 860 437 2739 P. 09

( L, Seri ZDrnn;nioii NEWS RELEASE Release # I_

Date:

04-17-2005 Information as of:

10:49 4-17-2005 DOMINION DECLARES ALERT AT MILLSTONE POWER STATION WATERFORD, Conn. - An emergency was declared today at Millstone Power Station Unit 3. An Alert, the second lowest of four emergency classifications used by the U.S.

Nuclear Regulatory Commission, was declared at 8:42 a.m.

Unit 3 has been shutdown and is in a stable condition. Federal, state and local emergency response agencies have been notified. An Alert ensures that additional emergency response personnel are on standby and ready to respond if needed.

No release of radioactive material has occurred beyond those minor releases associated with normal plant operations. These minor releases pose no danger to the public or plant workers. The minor releases are below federally approved operating limits, below natural background levels and can not be detected at the site boundary.

Further information about conditions at Millstone rill be provided as it becomes available.

As part of the Millstone emergency response plan, an Emergency Operations Facility has been activated at the nuclear station in Waterford, Connecticut.

The Millstone Power Station is owned and operated by Dominion.

04/17/2005 SUN 13:46

[TX/RYC NO 9923]

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