L-94-166, Responds to Violation Noted in Insp Repts 50-335/94-11 & 50-389/94-11.Corrective Actions:Complete Actuator Assembly & Valve Internals of MV-08-12 & MV-08-13 Replaced & Plant Maint Procedure 0950065 Changed
| ML17228A676 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 07/07/1994 |
| From: | Goldberg J FLORIDA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| L-94-166, NUDOCS 9408150126 | |
| Download: ML17228A676 (4) | |
Text
J.MJMJ.
J. Y 1
(ACCELERATED RIDS PROCESSING) i REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9408150126 DOC.DATE: 94/07/07 NOTARIZED:
NO FACIL:50-335 St. Lucie Plant, Unit 1, Florida Power
& Light Co.
50-389 St. Lucie Plant, Unit 2, Florida Power
& Light Co.
AUTH.NAME AUTHOR AFFILIATION GOLDBERG,.J.H.
Florida Power
& Light Co.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Responds to NRC 940503,1tr re violations noted in insp rept 50-335/94-11
& 50-389/94-11.Corrective action:comp'eted actuator assembly
& valve internals of MV-08-12
& MV-08-13 were replaced.
DISTRIBUTION CODE:
ZEOID COPIES RECEIVED:LTR
(
ENCL
/ SIZE:
TITLE: General (50 Dkt)-Insp Rept/Notice of Violation Response NOTES:
DOCKET 05000335 05000389 RECIPIENT ID CODE/NAME PD2-2 PD INTERNAL: ACRS AEOD/DSP/ROAB AEOD/TTC NRR/DORS/OEAB NRR/PMAS/IRCB-E OE DZR REG FILQ 02 FILE 01 EXTERNAL'G&G/BRYCEFJ
~ H ~
NSIC COPIES LTTR ENCL 1
1 2
2 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 RECIPIENT ID CODE/NAME NORRISFJ AEOD/DEIB AEOD/DSP/TPAB DEDRO NRR/DRCH/HHFB NUDOCS-ABSTRACT OGC/HDS3 RES/HFB NRC PDR COPIES LTTR ENCL 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 NOTE TO ALL"BIDS" RECIPIENTS:
PLEASE I.IELP US TO REDUCE AVASTE!CONTACTTIRE DOCUMENTCOIVTROL DESK. ROOKI Pl-37 (E>'T. 504-2083 ) TO ELIS!INATE YOUR NAME PROD!
DISTRIBUTIONLISTS I'OR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 21 ENCL 21
L-94-166 10 CFR 2.201 U. S. Nuclear Regulatory Commission Attn:
Document Control Desk washington, D.
C.
20555 Re:
St. Lucie Units 1 and 2
Docket Nos.
50-335 and 50-389'eply to Notice of Violation Ins ection Re ort 94-11 Florida Power and Light Company (FPL) has reviewed the subject inspection report and pursuant to 10 CFR 2.201 the response to the notice of violation is attached.
Very truly yours, President Nuclear Division ZHG/JWH/kw Attachment.
cc: Stewart D. Ebneter, Regional Administrator, USNRC Region II Senior Resident Inspector, USNRC, St. Lucie Plant DAS/PSL 41150-94 9408150126 940707 PDR ADOCK 05000335 8
Re:
St. Lucie Units 1 and 2
Docket Nos.
50-335 and 50-389 Reply to Notice of Violation Ins ection Re ort 94-11 e
VIOLATION:
10 CFR 50 Appendix B, Criterion XVI, requires measures which assure that conditions adverse to quality are, promptly identified and corrected.
For significant conditions, the identification, cause, and corrective action taken're required to be documented and reported to appropriate levels of management.
Contrary to the
- above, on May 3,
- 1994, in three instances the licensee's measures had not been effective in assuring that:
(1) conditions adverse to quality would be promptly identified and corrected; and (2) the identification and correction of significant conditions adverse to quality were documented and reported to management.
The significant conditions adverse to quality involved stall failures of redundant Unit 2 motor-operated valves (MOVs) 2-MV-08-12 and
-13, which operate to supply steam to the Unit 2
Turbine Driven Auxiliary Feedwater Pump.
Valve 2-MV-08-12 'stalled when actuated to open on November 11,
- 1991, and 2-MV-08-13 similarly stalled on September 15, 1992 and July 20, 1993.
The licensee did not identify that the stall thrust and torque forces
.had exceeded the associated actuator and valve maximum limits.
Corrective actions documented did not provide an adequate basis for returning the actuator and valve to operation.
RESPONSE
1 ~
REASON FOR V10LATION Plant Maintenance Procedure 0950065 "Troubleshooting Limitorque Valve Actuators" did not include the recommendations of "Limitorque Maintenance Update 92-1" and "Limitorque Technical Update 92-1."
These documents contain calculations used to determine the approximate loads the actuators and valves may have seen under stall conditions.
Performing these calculations help in determining if damage has occurred based on allowable overloads.
This was erroneously deemed unnecessary by electrical maintenanc'e and engineering personnel due to the capability of the MOV diagnostics equipment to predict problems with the components of concern during potential stall events.
The recommended calculations were performed at the time of this inspection and proved that the stall thrust and torque forces had not exceeded the associated actuator and valve maximum limits.
2 ~
CORRECTIVE STEPS TAKEN AND THE RESULTS ACHIEVED The complete actuator assembly and valve internals of MV-08-12 and MV-08-13 were replaced on April 15, 1994 to ensure increased reliability.
No further problems have been experienced with these valves.
'0 Re:
3 ~
St. Lucie Units 1 and 2
Docket Nos.
50-335 and 50-389 Reply to Notice of Violation Ins ection Re ort 94-11 CORRECTIVE STEPS TO AVOID FURTHER VIOLATIONS Plant Maintenance Procedure 0950065 "Troubleshooting Limitorque Valve Actuators" has been changed to include a
reference to the recommendations of "Limitorque Maintenance Update 92-1" and "Limitorque Technical Update 92-1."
This will ensure that the necessary calculations are performed and documented when a
MOV has stalled.
4 ~
DATE WHEN FULL COMPLIANCE WILL BE ACHIEVED Full compliance was achieved on April 15, 1994 with the completion of corrective action 2 above.