ML17229B082
| ML17229B082 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 04/07/1999 |
| From: | Stall J FLORIDA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17229B083 | List: |
| References | |
| GL-90-05, GL-90-5, GL-91-18, L-99-90, NUDOCS 9904120108 | |
| Download: ML17229B082 (6) | |
Text
REGULA'1 Y INFORMATION DISTRIBUTI.
SYSTEM (RIDS)
-ACCESSION NBR:9904120108 DOC.DATE: 99/04/07 NOTARIZED: NO DOCKET ¹ FACIL:50-389 St. Lucie Plant, Unit 2, Florida Power
& Light Co.
05000389 AUTH.NAME AUTHOR AFFILIATION STALL,J.A.
Florida Power
& Light Co.
RECIP. NAME RECIPIENT AFFILIATION Records Management Branch (Document Consol Desk) r
SUBJECT:
Requests approval of interim relief request 26 re'epair requirements for Class 2
ECCS piping,per 10CFR50.55a(a)(3) 50.55a(g)(iii).Alternative actions apply guidance of GLs 91-18
& 90-05
&. ASME Code Case N-513.Evaluation, encl.
DISTRIBUTION CODE:
A047D COPIES RECEIVED:LTR t
ENCL I
SIRE: 3 k T
TITLE: OR Submittal: Inservice/Testing/Relief from ABLE Code - GL-89-04 E
NOTES:
RECIPIENT ID CODE/NAME PD2-3 LA GLEWiES, N COPIES LTTR ENCL 1
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RECIPIENT ID CODE/NAME PD2-3 PD COPIES L TR-ENCL 1
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INTERNAL: ACRS NRR/DE/FCGB OGC/HDS3 RES/DET/EMMEB 1
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1 ILE CElgE~31 OCS-ABSTRACT RES/DET/EIB 1
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Y EXTERNAL: LITCO M'DERSON NRC PDR NOAC D
N NOTE TO ALL "RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD)
ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 13 ENCL 12
Florida Power st Light Company, 6351 S. Ocean Drive, Jensen Beach, FL 34957 April7, 1999 L-99-90 10 CFR 50.4 10 CFR 50.55a U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE:
St. Lucie Unit 2 Docket No. 50-389 In-Service-Inspection Plan Second Ten-Year Interval Interim Relief Re uest 26 Pursuant to 10 CFR 50.55a(a)(3) and 50.55a(g)(5)(iii), Florida Power and Light Company (FPL) requests approval of Interim Relief Request 26, Repair Requirements for Class 2 ECCS Piping, located on the Refueling Water Tank (RWT) suction piping to the Emergency Core Cooling System (ECCS) pumps.
Enclosed is Interim Relief Request 26. The alternative actions discussed in interim relief request 26 meet the intent of applying the guidance of NRC Generic Letter 91-18, NRC GL 90-05 and ASME Code Case N-513 to moderate energy ASME Class 2 piping. Attachment 1 of Interim Relief Request 26 is Engineering Evaluation PSL-ENG-SEMS-98-102, Rev. 2, which contains APTECH Calculation AES-C-3566-I, Evatuarton of Corrosion Degradation of 24 inctt EC-CS Piping at St Luci.e Unit 2, Revision I dated April 7, 1999. Attachment 2 ofInterim Relief Request 26 is Condition Report 99-0445 /
containing the interim engineering disposition of the ECCS suction header operability. Attachment 3 of Interim Relief Request 26 is letter CSI-NDE-99-012, C/iaracterization ofIdentified Leaks on PSI 2 CS-2
& CS-3. FPL discussed this issue in a conference call with NRC Office of Nuclear Reactor Regulation and Region II personnel on April6, 1999.
A code repair or replacement willbe accomplished by removing one header from service at a time. The code repair willbe completed by April21, 1999. The proposed alternatives provide an acceptable level of quality and safety, and compliance with the specified requirements would result in hardship or unusual difficultywithout a compensating increase in the level of quality and safety.
Please contact us ifthere are any questions about this submittal.
Very truly yours, J. A. Stall Vice President St. Lucie Plant JASIGRM cc:
Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant
'gr90gl i20i08 'gr90407 PDR ADGCK 05000389 8
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l'1
St. Lucie Unit 2 Docket No. 50-389 I 99-90 Enclosure Page 1
St. Lucie Unit 2 SECOND INSPECTION INTERVAL INTERIMRELIEF REQUEST NUMBER 26 A.
COMPONENT IDENTIFICATION'.
ASME Section III, Class 2 Emergency Core Cooling (ECCS) Suction Piping at Florida Power 8 Light Company's (FPL) St. Lucie Unit 2.
CODE REQUIREMENT:
ASME Section XI, 1989 Edition with no Addenda, paragraph IWC-3132 requires that components whose examination reveals relevant conditions described in the standards ofTable IWC-3410-1, shall be unacceptable for continued service unless such components meet the requirements of IWC-3132.1, IWC-3132.2, IWC-3132.3 or IWC-3132.4.
C.
RELIEF REQUESTED:
Pursuant to 10 CFR 50.55a (g)(5)(iii), FPL requests interim relief from the repair and/or replacement requirements of the ASME Boiler and Pressure Vessel Code,Section XI, 1989 Edition, Articles IWA/IWC-4000and IWA/IWC-7000. This would authorize the facilityto operate with through-wall leaks in ASME Class 2 piping until a Code repair and/or replacement can be accomplished.
FPL proposes to complete the Code repairs by April21, 1999.
D.
BASIS FOR RELIEF:
E.
FPL has determined, based upon results of current observation and evaluation ofthe ECCS suction piping, that compliance with the repair and/or replacement requirements ofASME Section XI, within the time frame allowed by plant Technical Specifications, would be impractical, and would create a undue hardship on FPL, without a compensating increase in quality or safety. As discussed with the NRC on April6, 1999, FPL applied the guidance in NRC GL 91-1 8, NRC GL 90-05, and ASME Code Case N-513 to evaluate the functionality of the moderate energy ASME Class 2 ECCS piping.
The alternative actions discussed below will assure a continued level of quality and safety of the unit until a code repair/replacement can be made.
ALTERNATIVEACTIONS:
In lieu of an immediate ASME Section XI Code repair and/or replacement, FPL proposes to apply NRC GL 91-18, NRC GL 90-05, and ASME Code Case N-513 for moderate energy Class 3 piping to the operability assessment ofthe ASME Class 2 ECCS suction piping. The ECCS piping has a maximum operating pressure of 30 psig and a maximum operating temperature of 120'F and therefore falls under the definition of moderate energy piping. Consistent with NRC GL 91-18, NRC GL 90-05, and ASME Code Case N-513, the following actions are being implemented:
1.
Aflaw evaluation was performed to ASME Section XI, Appendix C, methods and acceptance criteria. The allowable through-wall flaw lengths and estimated flaw growth during service were computed.
The conservative flawgrowth analysis indicates that adequate safety margin will be maintained for at least one cycle of operation.
The structural integrity of the piping is acceptable for the design basis loading conditions based on leak-before-break.
Therefore, leakage detection in the areas affected by the corrosion degradation will be sufficient to maintain pipe integrity. Attachment 1 contains APTECH Calculation, Evaluation ofCorrosion Degradation of24-inch ECCS Piping at St. Lucie Unit 2.
J
~,
St. Lucie Unit 2 Docket No. 50-389 I 99-90 Enclosure Page 2 St. Lucie Unit 2 SECOND INSPECTION INTERVAL INTERIMRELIEF REQUEST NUMBER 26 3.
4, 5.
6.
Condition Report 99-0445, Interim Disposition, (Attachment 2) provides the operability assessment for the subject piping and the ECCS subsystems.
Flaw geometry was characterized to the extent practical by volumetric examination and physical measurement (Attachment 3).
Augmented visual examinations ofthe affected areas ofthe piping have been performed.
The leakage will be observed daily via walkdowns to confirm analysis conditions used in the evaluation remain valid.
The ASME Code required repair/replacement will be completed by April21,1999.
F.
IMPLEMENTATION SCHEDULE'he alternative actions addressed in Section E. ofthis relief request commenced on April6, 1999 and willbe completed by April21, 1999.
ATTACHMENTSTO THE RELIEF REQUEST: :
Engineering Evaluation PSL-ENG-SEMS-98-102, Revision 2, dated April 7, 1999, including APTECH Calculation AES-C-3566-1, Revision 1 dated April7, 1999. :
Condition Report 99-0445, Interim disposition, dated April 7, 1999 :
Letter CSI-NDE-99-012, Characterization of Identified Leaks on PSL-2 CS-2 8 CS-3 dated April 7, 1999.