ML20137R973
| ML20137R973 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 01/06/1994 |
| From: | Jaudon J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML20137Q937 | List: |
| References | |
| FOIA-96-485 NUDOCS 9704140316 | |
| Download: ML20137R973 (4) | |
Text
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ATTACHMENT B i
TRIP REPORT MEMORANDUM FOR:
Deputy Regional Administrator FROM:
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SUBJECT:
REPORT ON TRIP TO E /t/r/d DATE(S) 0F VISIT:
8&n 5-6, NW PURPOSE OF VISIT:
Nnf-bl O INSPECTOR (S) OBSERVED:
M.Mi// Fry b SENIOR LICENSEE PERSON CONTACTED:
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Cognizant DRP Section Chief
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Cognizant DRP Branch Chief
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9704140316 970327 PDR FotA BINDER 96-485 PDR
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UNFAVORABLE FEEDBACK (ISSUE OR PROBLEM) '[3wp.ferrW/</ [4 /////19MM
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COPMENTS RECOPMENDATIONS/ RESOLUTION I
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Chief, MOAS /ILPB, NRR Cognizant Senior Resident Inspector l
Cognizant DRP Section Chief Cognizant DRP-Branch Chief Technical Division Directors Deputy Regional Administrator i
Regional Administrator l
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April 4,1994 ST LUCIE Recent Sionificant Events / Findinas Date Cause Identified Event / Finding 11/2/93 Operating Licensee Unit 1 manual trip - abnormal turbine procedures cooling water lineup at reduced power SALP period ended 1/1/94 1/9/94 Equipment licensee Manual trip - feed pump control circuit failure failure 2/8/94 TPPR Conducted 2/17/94 Operator Licensee Hispositioned valve discovered. Aux.
error 3ressurizer spray isolation valve had
]een locked closed (vice open) since 3/27/93.
3/16/94 Equipment Licensee A pressurizer instrument nozzle that had failure been repaired a year ago was found leaking.
Failure a year ago was in Inconel 600 nozzle. The repair used an Inconel 690 nozzle and Inconel 182 shielded metal arc weld material. The repair was inspected by NRC. with 1 VIO for incorrect weld rod size.
Current failure attributed to PWSCC of Inconel 182 shielded metal arc weld material. A new mod (re-using the Inconel 690
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nozzles and an external Inconel 690 weld) is being inspected by NRC (Crowley/Coley).
[ CHANGED]
3/16/94 Enginee-ing Licensee Regional inspector has two potential error violations:
- 1) inadequate corrective action for an 11/2/92 water hammer event, resulting in operating with two PORV tailpipe snubbers inoperable.
2) i Failure to write nonconformance reports for the inoperable snubbers.
IR not yet issued.
3/28/94 Maintenance Licensee Auto reactor trip. Maintenance foreman error opened breaker - on wrong unit and not authorized to operate breaker.
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3/29/94 Equipment Licensee Licensee discovered body-to-bonnet leak failure on non-isolable ten-inch shutdown cooling isolation valve.
Leak rate about two drops /second (TS-allowable).
Licensee installed exterior clamp and leak repair compound on valve.
4/2/94 Equipment Licensee Startup transformer output breaker fails failure to open.
4/3/94 Personnel Licensee Reactor trip from 19% power while Error (Lack deenergizing the 4160 Volt non-vital bus of to allow safe removal of the failed SU suficient Tx output breaker for maintenance. The depth in isolation ] laced the A emergency bus on review of the EDG, w1ich was running at a procedure different frequency from the grid. The change) paralleled CEA MG sets, now with different frequency drivers, developed circulating currents and several
[ CHANGED]
trippped circuit breakers. A partial reactor trip tripped the turbine, which tripped the reactor.
[ CHANGED]
4/3/94 Installed Licensee During testing for Unit 2 modifications equipment the licensee discovered that the 4160 V error
[AB Bus] swing bus components [C ICW Pump and C CCW Pump] would not stri) from the bus upon undervoltage if tie bus were aligned to the B bus. A missing jumper wire in the switchgear was the proximate cause. This is being epared for enforcement panel j
1scussion.
[ CHANGED]
Harch inspector Tom Johnson failure to follow refueling bridge operating procedure resulted in trying to pick up two fuel bundles at a time.
March Inspector Elrod Failure to install proper connection washers on 2A safety battery - Maintenance supervisor error.
NRC CONCLUSION: The mispositioned valve and water hammer occurred over a year ago.
None of the above personnel errors are similar. These events and J
findings may be precursors to declining performance.
Further very close inspection and assessment is required.
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