ML052310588
| ML052310588 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/17/2005 |
| From: | Douglas Dodson Dominion Nuclear Connecticut, Northeast Nuclear Energy Co (NNECO) |
| To: | Gott B NRC/FSME |
| References | |
| FOIA/PA-2005-0207 | |
| Download: ML052310588 (5) | |
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APR-1-2005 15:00 MILLSTONE
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19/62 14ups 860 44.3 5893 P.03 4 1 7/O5 1
NRC Event Notification Form (Sheet 1 of 2)
NRC CONTACr (NAME) _i//
6L oz NRC EVENT NUMBER: AA UP-7
'NOTIFICATION TIME rAC3LlTYOR ORGANIZATION UrrIOFNME
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Non-Eiergeucy 8-Hr Non-Emrgency CLASSIFICATION 10 CdR S.72 (b)(l) 10 CFR 50.72 (b)(2) 10 CIX 50.72 (b)(3)
GENERLEMRGENCY TS Dcviation (i)
TS Required Shut-MMi)(A)
Detraded Conditon down SE AREAEMERGENCY (iv)(A) ECCS Discharge to (t)(8) Unanalyzed Cond;s RCS fion that Dcgadcs Safety ALEn 60 Day Optional
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RHR Ccpaility PHYSICAL SECURZIY (VX Contol of R Rc-(73.71) kue MIATERTAIEXPOSURE (y)(D) Accidcnt Mitiption FITNESS FOR DUlY (Xi)
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APR-19-2005 15:00 M ILLSTONE 860 443 5893 P.04 NRC Event Notification Form (Sheet 2 of 2)
NOTIFICATIONS E
0 L BE ANYTIG UNUSUAL OR NO yS NO Q UNDER!MOD?
(EXPLAIN SHEET 1)
NRC RESIDENT DID ALL SYSTEMS FUNCTION YESi NO e-AS REQUIREDI (EXPLAIN SHEET 1)
STATE MODE OF OPEAION UNTIL CORRECT.
LOCAL ESTh(TD RESTARTIDATE:
xiso OTHER GOV AGENCIES ADDITlONAL INFO ON BACK: YES N O09" MEDI)JFRESS RELEASE RADIOLOGICAL RELIASXS CHECKOR ILLINAPPLICABLZ IT6,S LIQUID GASEOUS UNPLANNED PLANNED ONGOING TERMINATED RELEASE RELEASE RELEASE RELEASE MONITORED UNMONMIORE OFFSITE T S.
Rld ALARMS AREAS RELEASE EXCEEDED EVACUATED PERSONNEL EXPOSED OR OFPSITE PROTECITvE ACTIONS State rekae path in desceipo on CONTAMTNATED RECOMMNDED RcIesc Rate
%T.J LIMIT ROO GUI2DE Toil
% T.S. LIT ROO GUIDE (Cifz)
AAtivity (0)
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OTHEI EJECIOR STEAM LINE SLOWDOWN 1.AD MONITOR READ-INGS:
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LOCATION OF THE LEAK (O.e., SO#. valvec pipe, cte):
LEAK RATEl UN1TS pngpd T. S. LIITS:
SUDDEN OR LONG-TERMA l
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SECOlDARy-LIST OF SAFETY RELATED EQUIMN NOT OPERATINoAq-SMIMSEO Signature:
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Rev. 001-04 99 of 115
iPR-18-20O5 15:00 MILLSTONE APR-18-2005 15: 00 M ILLSTONE 860 443 593Z
- a. U.5 Attachment to April 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 M SSV 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 (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.
HM1 I lLLIUNh 860 443 5893 P.06 Attachment to April 17,2005 Event Notification Summary of Event Event No. 41607 Update to previous information:
The previously reported time of the ALERT declaration should be corrected to read 0842. Millstone Unit 3 entered Mode 4 at approximately 1903 on April 17, 2005. The event at Millstone Unit 3 was terminated at 1905. The cause of event is under investigation. A recovery plan is being formulated.