PNO-II-97-022, on 970418,CR Operators Noted 1B2 Safety Injection Tank Level Indication Slowly Decreasing & Slight Leakage Increase Detected on Reactor Cavity Leakage Recorder.Unit Shutdown & Cooled Down to Cold Shutdown
| ML17229A310 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 04/21/1997 |
| From: | Julian C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| References | |
| PNO-II-97-022, PNO-II-97-22, NUDOCS 9704210175 | |
| Download: ML17229A310 (2) | |
CATEGORY lg REGULATO INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9704210175 DOC.DATE: 97/04/21 NOTARIZED: NO FACIL:50-335 St. Lucie Plant, Unit 1, Florida Power
& Light Co.
AUTH.NAME AUTHOR AFFILIATION JULIAN,C.
Region 2 (Post 820201)
RECIP.NAME RECIPIENT AFFILIATION DOCKET ¹ 05000335
SUBJECT:
PNO-II-97-022:on 970418,CR operators noted 1B2 safety injection tank level indication slowly decreasing
& slight leakage increase detected on reactor cavity leakage recorder. Unit shutdown
& cooled down to cold shutdown.
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April 21, 1997 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO"II-97-022 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance.
The information is as initially received without verification or evaluation, and is basically all that is known by Region II staff in Atlanta, Georgia on this date.
~Pacilit Florida Power 6 Light Co.
Saint Lucie 1
Florida Dockets:
50-335 Licensee Emer enc Classification X Notification of Unusual Event Alert Site Area Emergency General Emergency Not Applicable
Subject:
PLANT SHUTDOWN'DUE TO RCS. LEAKAGE A Reactor Coolant System (RCS) pressure boundary leak of 0.5 GPM was identified on the "1B2" Safety Injection Header inside containment.
At approximately 8:20 p.m.
on 4/18/97, control room operators noted that the "1B2" Safety Injection Tank level indication was slowly decreasing and there was a slight leakage increase detected on the reactor cavity leakage recorder.
Reactor power was reduced so plant personnel could enter the containment to find the reason for the Safety Injection Tank "1B2" decreasing level.
At 2:15 a.m.,
on 4/19/97, RCS pressure boundary leakage was positively identified as occurring on the "1B2" Safety Injection Header inside containment.
The leakage was estimated to be 0.5 GPM and was visually identified as a socket weld leak where a 1" vent line ties into the 12" Safety Injection Header.
The leak was isolated from the RCS by the "1B2" Safety Injection Header Check Valve QV3427, and was considered to be within the RCS pressure boundary leakage as defined in 10 CFR 50.2(v).
RCS inventory balances verified that the leakage was borated water from the injection header and not reactor coolant.
An unusual event was declared at 2:18 a.m.,
on 4/19/97, due to RCS pressure boundary, leakage.
The unit was shutdown and cooled down to cold shutdown.
The resident inspector was on site throughout the event and during the subsequent shutdown.
The unusual event was terminated and the technical specification LCO action statement was exited at 3:15 a.m.
when Unit 1 entered cold shutdown (Mode 5).
On 4/20/97 the socket weld was repaired, and a root cause review has been initiated by the licensee.
The unit is being prepared for restart on 4/22/97.
The licensee notified state and local officials of the unusual event.
Contact:
C.
JULIAN (404)331-5526