ML20216F710

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Forwards Response to NRC 990806 RAI Re USI A-46,verification of Seismic Adequacy of Mechanical & Electrical Equipment in Operating Reactors.Nrc Is Informed That Actions Required for Resolution of USI A-46 Have Been Completed
ML20216F710
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 09/17/1999
From: Abbott R
NIAGARA MOHAWK POWER CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-GTECI-A-46, REF-GTECI-SC, TASK-A-46, TASK-OR NMP1L-1470, NUDOCS 9909230150
Download: ML20216F710 (16)


Text

{{#Wiki_filter:Il. c NiagarahMohawk' i Richard B. Abbott Phone: 315.349.1812 Vice President Fax: 315.349.4417 NuclearEngineering SC9t**U'Y II* 1999 NMPIL 1470 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE: Nine Mile Point Unit 1 Docket No. 50-220 DPR-63

Subject:

USI A-46, Verification ofSeismic Adequacy ofMechanical and Electrical Equipmentin Operating Reactors Gentlemen: Byletter dated March 11,1996, Niagara Mohawk Power Corporation (NMPC) submitted the Nine Mile Point Unit I (NMPI) plant-specific summary reports regarding Unresolved Safety hsue (USI) A-46, verification of seismic adequacy of mechanical and electrical equipment in epeiating reactors. These reports contained the results of the evaluations performed at NMP1 and delineated the Generic Implementation Procedure (GIP-2) outliers related to USI A-46. The March 11,1996 letter also indicated that the NRC would be informed when planned actions for resolution of USI A-46 had been completed. The purpose of this letter is to provide additional ~information regarding USI A-46 and to inform you that actions required for resolution of USI A-46 has e been completed. NMPC and the Staff discussed issues related to USI A-46, including changes to our March 11, 1996 letter, by telephone conversation dated July 14,1999. By letter dated August 6,1999, the NRC requested a response to certain items discussed during this conversation. The Attachment to this letter provides this information. NMPC's letter dated August 18,1999 provided informationjustifying use of GIP Method A. This letter also inG3ted Mat NMPC had completed resolution of GIP-2 outliers related to USI A-46 during Refueling Outage No.15. These actions, together with the attached information, completes the actions for resolution of USI A-46. Very truly yours, (dA< / 9909230150 990917 PDR ADOCK 05000220 Richard B. Abbott P PDR-Vice President - Nuclear Engineering RBA/JMT/ kap ()} Attachment Nine Mile Point Nuclear station P0. Box 63. Lycommg, New York 13093 0063

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e Page 2 xc: Mr. H. J. Miller, NRC Regional Administrator, Region I Mr. S. S. Bajwa, Section Chief PD-I, Section i, NRR Mr. G. K. Hunegs, NRC Senior Resident Inspector Mr. D. S. Hood, Senior Project Manager, NRR Records Management i l i 1 i i

e e l ATTACIIMENT

ATTACHMENT Ouestions from the July 14.1999 Teleohone Conference between Niagara Mohawk Power Cornoration (NMPC) and the NRC on the Nine Mile Point Unit 1 (NMPI) Unresolved Safety Issue (USI) A-46 Program Qutadon_l: Is the effective grade for all structures elevation 243 feet? Response 1: The Summary Report for Resolution of USI A-46, Attachment 1, Section 5.1.1 establishes the effective grade for structures containing USI A-46 safe shutdown equipment at about 240-243 feet. Our Summary Report was issued by letter dated March 11,1996. Ouestion 2: Provide a building specificjustification for the use ofMethod A.1 at the locations where the amplification significantly exceeds the 1.5 limit at frequencies above 8 Hz. Response 2: Thisjustification was provided in NMPC letter dated August 18,1999. Thefollowing questions are about the Screening Venfication Data Sheets (SVDS) which are part of the NMP1 USI A-46 Summary Report. Ouestion 3: Provide a list of abbreviations which you use to specify the seismic capacity and the seismic demands for the equipment listed in the SVDS. Response 3: RRS: Realistic, Median-Centered In-Structure Response Spectra TRS: Tested Response Spectra CRS: Conservative, Design In-Structure Response Spectra Ouestion 4: On page I line numbers 7140 and 7139, what do the words "yes" in the Capacity Spectrum and the Demand Spectnim columns mean? 1

E. ] Response 4: i The word "yes" is a typographical error. The enclosed Seismic Verification Data Sheet (SVDS) l has been revised to show the Capacity Spectrum to be " DOC" and the Demand Spectrum to be l "GRS". l l l Ouestion 5: On pages 2,3, and 4 the Capacity Spectrum is listed as the GERS and the Demand Spectrum is listed as the GRS for numerous equipment items at elevations greater than 40 feet above the effective grade. Since Table 4-1 of GIP-2 requires that, for equipment more than 40 feet above effective grade, the GERS be compared to the Conservative Design In-Structure SSE Response l Spectrum or 1.5 times the Realistic Median-Centered In-Structure SSE Response Spectrum, l justify the comparison indicated in the SVDS. 1 Response 5: l The use of GRS for the Demand Spectra is incorrect. The enclosed SVDS have been revised to use the Demand Spectrum as the RRS. The remaining columns of the SVDS did not require a change and remain the same. l Ouestion 6: 1 On page 3 line 6144 you list the Demand Spectrum as BS which is the Bounding Spectmm. The l Bounding Spectrum is a seismic capacity, explain why it is listed as a demand. If this entry is a typographical error provide the correct Demand Spectrum name. . Response 6: j The Demand Spectra as BS is a typographical error. The enclosed SVDS line 6144 Demand l Spectra is revised to RRS. Ouestion 7: On page 12 line 7605, you indicate that the equipment elevation is more than 40 above effective grade, but the Seismic Demand to Seismic Capacity comparison used the Bounding Spctmm and the Ground Response Spectrum which GIP-2 only allows for equipment at elevations below 40 feet above effective grade. Explain your use of this comparison. 2

m. Response 7: The use of GRS for the Demand Spectra is incorrect. The enclosed SVDS has been revised to use the Demand Spectmm as the RRS. The remaining columns of the SVDS did not require a change and remain the same. Question 8: On pages 26,27,35 and 36 lines 6171,6168,6165,6167,8131, and 8132 you use the abbreviation TRS for the Capacity Spectrum and CRS for the Demand Spectrum. Since, in the telephone conference, you indicated that RRS is the symbol for your in-structure response spectra what is CRS? Also,'what is TRS7 It is not on the GIP-2 SEWS list of abbreviations. . Response 8: The TRS is defined in Response No. 3. The seismic capacity of the equipment on pages 26,27, 35, and 36 in lines 6171,6168,6165,6167,8131 and 8132 is based on existing plant documentation. The SVDS Capacity Spectrum TRS is revised to DOC to be consistent with the GIP The CRS is a carryover from the BWR pilot plant walkdown list of safe shutdown equipment. The CRS is revised to RRS. The appropriate changes are reflected in the enclosed sheets. 3

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