L-91-207, Forwards Response to Suppl 2 to NRC Bulletin 89-001, Failure of Westinghouse Steam Generator Tube Mechanical Plugs
| ML17223B232 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 07/29/1991 |
| From: | Bohlke W FLORIDA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-001, IEB-89-1, L-91-207, NUDOCS 9107310209 | |
| Download: ML17223B232 (6) | |
Text
ACCELERATED DISTMBUTION DEMONSTRATION SYSTEM REGULATORY INFORMATION DISTRXBUTION SYSTEM (RIDS)
ACCESSION NBR:9107310209 DOC.DATE: 91/07/29 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 BOHLKE,W.H.
Florida Power
& Light Co.
RECIP.NAME RECIPIENT AFFILIATXON Document Control Branch (Document Control Desk)
DOCKET 05000335 05000389 R
SUBJECT:
Forwards response to Suppl 2 to NRC Bulletin 89-001, "Failure of Westinghouse Steam Generator Tube Mechanical Pluges."
DISTRIBUTION CODE:
IE31D COPIES RECEIVED:LTR i
ENCL SIZE:
TITLE: Bulletin Response 89-01 re Failure of We tinghouse Steam Gen.
Mech.
T NOTES:
RECIPIENT XD CODE/NAME PD2-2 LA NORRIS,J INTERNAL: AEOD/DOA NRR/DET/EMCB 9H NRR/DOEA/OEAB11 NRR/DREP/PEPB9D NRR/PMAS/ILRB12 RES/DSIR/EIB EXTERNAL: NRC PDR COPIES LTTR ENCL 1
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1 1
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1 RECIPIENT ID CODE/NAME PD2-2 PD AEOD/DSP/TPAB NRR/DET/EMEB 7E NRR/DOEA/OGCB11
/DSK432 REG FIXED%
GN~'FILE 01 NSIC COPXES LTTR ENCL 1
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D NOTE TO ALL"RIDS" RECIPIENTS:
D D
PLEASE HELP US TO REDUCE iVASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
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4 P.O. Box14000, Juno Beach, Fl 3340B-0420 JUL 29 1S9t L-91-207 10 CFR 50.54(f)
U. S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, D.
C.
20555 Gentlemen:
Re:
St. Lucie Units 1 and 2
Docket Nos.
50-335 and 50-389 NRC Bulletin 89-01 Res onse to Su lement 2
The NRC bulletin supplement requested that actions similar to those requested in the NRC Bulletin 89-01, "Failure of Westinghouse Steam Generator Tube Mechanical Plugs,"
be expanded to include all Westinghouse mechanical plugs fabricated from thermally treated Inconel 600.
The response to Actions Requested items 1 and 2 is attached.
The response is provided pursuant to 10 CFR 50.54(f) and Section 182a of the Atomic Energy Act of 1954, as amended.
Very truly yours, gu~
W. H. Bohlke Vice President Nuclear Engineering and Licensing WHB/GRM/kw Attachment cc: Stewart D. Ebneter, Regional Administrator, USNRC Region II Senior Resident Inspector, USNRC, St. Lucie Plant DAS/PSL
$482-91 910?310209 910729 PDR ADOCK 05000335 IQ PDR an FPL Group company uE3/
l/g
. St. Lucie Units 1 and 2
Docket Nos.
50-335 and 50-389 NRC Bulletin 89-01 Res onse to Su lement 2
STATE OF FLORIDA
)
)
COUNTY OF PALM BEACH
)
~
N. H. Bohlke being first duly sworn, deposes and says:
That he is Vice President, Nuclear Engineering and Licensing of Florida Power
& Light Company, the Licensee herein; That he has executed the foregoing document; that the statements made in this document are true and correct to the best of his knowledge, information and belief, and that he is authorized to execute the document on behalf of said Licensee.
W. H. Bohlke Subscribed and sworn to before me this CP day of NOTARY PUBLIC, in and or the County of Palm Beach, State of Florida S olary Poblic, State ot Florida Y Comm. ExP. Feb. 1g, 1995 My Commission expires
'" <<broPtt:ttAttgtns.A e
St. Lucie Units 1 and 2
Docket Nos.
50-335 and 50-389 NRC Bulletin 89-01 Res onse to Su lement 2
RESPONSE
TO NRC BULLETIN 89-01 SUPPLEMENT 2 FAILURE OF WESTINGHOUSE STEAM GENERATOR TUBE MECHANICAL PLUGS Actions Re ested:
1 ~
Addressees are requested to verify that information contained in Table 2 of Reference 4 for their plants is correct for plugs fabricated from group 2
heats.
(Addressees have previously verified similar information for group 1 plugs in response to the original bulletin.)
The specific information to be verified is the number of Westinghouse mechanical plugs installed in the hot-leg and cold-leg side of each steam generator, categorized by heat number and date of installation.
The plug operating temperatures for each plant given i.n this Table should also be verified. If information from this Table is incorrect, addressees should provide correct information.
Addressees are requested to so state if their plants have not installed Westinghouse mechanical plugs from group 2 heats.
FPL Res onse:
FPL has verified that the information contained in the above referenced document is correct subject to the following clarifications:
St. Lucie Unit 1:
66 tube plugs, manufactured from heat NX-3513, installed in the A and B steam generators in 1985, were replaced during the EOC-9 1990 refueling outage.
The tubes were replugged with mechanical tube plugs manufactured from Alloy 690-TT.
St. Lucie Unit 2:
There are not any Westinghouse mechanical tube plugs installed in St. Lucie Unit 2.
Actions Re ested:
2 ~
Addressees are requested to take the following actionsg to be implemented initiallyduring any refueling outage or extended outage (greater than four weeks) which ends 60 days or more following receipt of this bulletin and during all future refueling outages.
For the period of time between receipt of the bulletin and 60
- days, the actions requested in the original version of this bulletin continue to be applicable for plugs fabricated from group 1 heats.
2.a.
Addressees should implement appropriate remedial actions (i.e., repair and/or replacement) for all plugs whose estimated lifetime in item 2.b below does not extend to'he next refueling outage.
FPL Res onse:
2.a.
FPL has implemented the remedial actions required in item 2.b per the recommended schedule or ahead of the recommended schedule.
Actions Re ested:
2.b. Remaining lifetime estimates (in effective full power days
[EFPD]), are given in Table 2 of Reference 4 in the column entitled
>>Remain EFPD to MIN.>>
These remaining lifetime estimates are relative to reference dates given in the column entitled
<<Reference CALC Dates.>>
These remaining lifetime estimates may be used directly.
These estimates should be adjusted to reflect any corrections 4
FPL Res onse:
2.b.
FPL has routinely utilized the lifetime estimates to implement repairs and will continue to use the lj.fetime estimates for future replacements/repairs.
Actions Re ested:
2.c. For refueling outages or extended outages ending prior to November 30, 1991, remedial actions for plugs fabricated from NX-5222 may be deferred until the next scheduled refueling outage.
FPL Res onse:
2.c. St. Lucie Units 1 and 2 do not have any plugs fabricated from heat NX-5222 installed.
Thus no action is required.
Actions Re ested:
2.d. Installation of Westinghouse mechanical plugs fabricated from Inconel 600 should be discontinued.
FPL Res onse:
2.d. St. Lucie Unit 1 has not installed any Westinghouse mechanical plugs fabricated from Alloy 600 since the 1985 refueling outage.
All subsequently installed mechanical tube plugs were fabricated from Alloy 690.
There are no Westinghouse mechanical plugs installed in St.
Lucie Unit 2 steam generators.
Actions Re ested:
2.e. If for any'efueling outage, the addressee daes not plan to satisfy items 2.a to 2.d above, an alternative plan for insuring "plug integrity, with appropriate technical justification, should be submitted to the NRC at least 30 days before the end of the refueling outage.
FPL Res onse:
2.e. St. Lucie has satisfied all actions required by the supplement to the 89-01 bulletin and will continue to satisfy the requirements per the referenced document.
Actions Re ested:
2.f. Prior to any plug repairs or replacement, addressees are reminded that their responsibilities under ALARA require analysis of the various plug repair or replacement methods.
In choosing a plug repair or replacement method, the licensee should consider the accessibility of the plugs and the dose reductian benefit of using rabotic manipulators.
Prior to plug repair ar replacement, the licensee should consider steam generatar decontamination and/ar local shielding to reduce working area dose rates.
FPL Res onse:
2.f. Replacement of suspect tube plugs in St.
Lucie Unit 1 was performed robotically in conjunction with ALARA principles.