ML010810197
| ML010810197 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 03/23/2001 |
| From: | Tam P NRC/NRR/DLPM/LPD1 |
| To: | Mueller J Niagara Mohawk Power Corp |
| Tam P | |
| References | |
| TAC MB0297 | |
| Download: ML010810197 (5) | |
Text
March 23, 2001 Mr. John H. Mueller Chief Nuclear Officer Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Operations Building, Second Floor Lycoming, NY 13093
SUBJECT:
NINE MILE POINT NUCLEAR STATION, UNIT NO. 2 - REQUEST FOR ADDITIONAL INFORMATION ON THE PROPOSED RISK-INFORMED INSERVICE INSPECTION ALTERNATIVE (TAC NO. MB0297)
Dear Mr. Mueller:
The NRC staff is reviewing the subject request from Niagara Mohawk Power Corporation (NMPC) dated October 16, 2000. On March 21, 2001, the staff held a telephone discussion with Mr. J. Dosa, et al. of your staff on comments we previously e-mailed (see publicly available e-mail, Accession No. ML010680486). At the conclusion of the discussion, we agreed to formally issue, in the form of a Request for Additional Information (RAI), all the questions, except No. 5, that we previously transmitted informally by the referenced e-mail.
The RAI is enclosed. Please respond expeditiously in order to support your requested target date of May 1, 2001. If you need clarification of this RAI, please feel free to call me at 301-415-1451.
Sincerely,
/RA/
Peter S. Tam, Senior Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-410
Enclosure:
As stated cc w/encl: See next page
Mr. John H. Mueller March 23, 2001 Chief Nuclear Officer Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Operations Building, Second Floor Lycoming, NY 13093
SUBJECT:
NINE MILE POINT NUCLEAR STATION, UNIT NO. 2 - REQUEST FOR ADDITIONAL INFORMATION ON THE PROPOSED RISK-INFORMED INSERVICE INSPECTION ALTERNATIVE (TAC NO. MB0297)
Dear Mr. Mueller:
The NRC staff is reviewing the subject request from Niagara Mohawk Power Corporation (NMPC) dated October 16, 2000. On March 21, 2001, the staff held a telephone discussion with Mr. J. Dosa, et al. of your staff on comments we previously e-mailed (see publicly available e-mail, Accession No. ML010680486). At the conclusion of the discussion, we agreed to formally issue, in the form of a Request for Additional Information (RAI), all the questions, except No. 5, that we previously transmitted informally by the referenced e-mail.
The RAI is enclosed. Please respond expeditiously in order to support your requested target date of May 1, 2001. If you need clarification of this RAI, please feel free to call me at 301-415-1451.
Sincerely,
/RA/
Peter S. Tam, Senior Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-410
Enclosure:
As stated cc w/encl: See next page Accession Number: ML010810197 OFFICE PDI-1/PM PDI-1/LA EMCB EMCB/ASC PDI-1/ASC NAME PTam SLittle*
SHou JDavis PTam DATE 3/22 /01 3/23/01 3/23/01 3/23/01 3/22/01
- M.OBrien concurred for S.Little OFFICIAL RECORD COPY DISTRIBUTION:
PDI-1 R/F PUBLIC MGamberoni PTam OGC ACRS CDoutt MRubin BPlatchek SLittle
REQUEST FOR ADDITIONAL INFORMATION PROPOSED RISK-INFORMED INSERVICE INSPECTION (RI-ISI) ALTERNATIVE NINE MILE POINT NUCLEAR STATION, UNIT NO. 2 (NMP2)
Reference:
Letter, R. B. Abbott (Niagara Mohawk Power Corporation) to NRC, dated October 16, 2000.
(1)
In Section 2.1 of the RI-ISI Program Plan, the alternative RI-ISI program is limited to American Society of Mechanical Engineers (ASME) Code Class 1 and Class 2 piping systems:
(i)
The Class 1 pipe components under Examination Category B-F are included in the proposed RI-ISI program plan. In accordance with Table IWB-2500-1 in the ASME Boiler and Pressure Vessel Code, B-F welds include both butt and socket welds for all pipe sizes. Please clarify the scope of B-F welds, preferably by the item number in the ASME Table, included in the RI-ISI program.
(ii)
The Class 1 pipe components under Examination Category B-J are included in the proposed RI-ISI program plan. In accordance with Table IWB-2500-1 in the ASME Code, B-J welds include circumferential, longitudinal, and socket welds for all pipe sizes. Please clarify the scope of B-J welds, preferably by the item number in the ASME Table, included in the RI-ISI program.
(iii)
The Class 2 pipe components under Examination Categories C-F-1 and C-F-2 are included in the proposed RI-ISI program plan. In accordance with Table IWC-2500-1 in the ASME Code, C-F welds include circumferential, longitudinal, and socket welds for all pipe sizes. Please clarify the scope of C-F welds, preferably by the item number in the ASME Table, included in the RI-ISI program.
(2)
In Section 3.5 of the RI-ISI Program Plan, NMPC states that NMP2's RI-ISI program will be inspecting greater than 10 percent of the Class 1 piping systems as given in Table 3.5-1. In accordance with Table 5-1, there are 94 Class 1 welds selected for inspection under the RI-ISI program. Please provide the population of Class 1 B-J and B-F welds within the scope of the RI-ISI program.
(3)
As discussed in Section 3.2.3 of the NRCs safety evaluation related to the Electric Power Research Institute report TR-112657, dated October 28, 1999, a pipe segment susceptible to a degradation other than flow accelerated corrosion (FAC) and which also has the potential for water hammer should receive a high pipe failure potential. NMPC has not identified water hammer as a potential degradation mechanism for selected pipe segments. Please clarify if any of the selected system welds are susceptible to water hammer and any other aging mechanism other than FAC.
(4)
Is there any recognizable plant experience regarding piping failures at NMP2?
(5)
(This question is deleted)
Enclosure (6)
For the systems identified as FWS [feedwater], ICS [reactor core isolation cooling], RHS
[residual heat removal and low pressure core injection A, B & C], RPV [reactor vessel nozzle], and WCS [reactor water cleanup], there are welds in certain risk categories that are exposed to other degradation mechanisms (e.g., transgranular stress corrosion cracking (TGSCC), crevice corrosion (CC), thermal transient (TT)) in addition to FAC or intergranular stress corrosion cracking (IGSCC). All welds in these specific risk categories are typically selected in the augmented FAC or IGSCC program. In some cases, none of these welds are selected in the RI-ISI program. Since the weld examination volume for one aging degradation type may be different from another aging degradation type, please clarify how welds in these specific risk categories are examined for the degradation mechanism (e.g., TASCS, CC, TT) other than FAC or IGSCC.
(7)
There are some differences when Table 3.8-1B and Table 3.8-2A (or 2B) are compared with respect to the following:
(i)
Number of welds currently inspected in accordance with Section XI (for systems identified as DER [drain connection to reactor water cleanup], ISC
[instrumentation], MSS [main steam], RDS [control rod drive], RPV, SLS
[standby liquid control], and WCS),
(ii)
Missing degradation mechanism for each risk category (for systems identified as RPV and WCS),
(iii)
Missing consequence for each risk category (for systems FWS and RHS), and (iv)
Missing high consequence welds for system WCS.
Please clarify the discrepancies between the data presented in these tables with respect to the four subject areas (i) to (iv).
Nine Mile Point Nuclear Station Unit No. 2 Regional Administrator, Region I U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Resident Inspector Nine Mile Point Nuclear Station P.O. Box 126 Lycoming, NY 13093 Mr. Jim Rettberg NY State Electric & Gas Corporation Corporate Drive Kirkwood Industrial Park P.O. Box 5224 Binghamton, NY 13902-5224 Mr. John V. Vinquist, MATS Inc.
P.O. Box 63 Lycoming, NY 13093 Supervisor Town of Scriba Route 8, Box 382 Oswego, NY 13126 Mr. Paul D. Eddy Electric Division NYS Department of Public Service Agency Building 3 Empire State Plaza Albany, NY 12223 Charles Donaldson, Esquire Assistant Attorney General New York Department of Law 120 Broadway New York, NY 10271 Mr. Timothy S. Carey Chair and Executive Director State Consumer Protection Board 5 Empire State Plaza, Suite 2101 Albany, NY 12223 Mark J. Wetterhahn, Esquire Winston & Strawn 1400 L Street, NW.
Washington, DC 20005-3502 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West Syracuse, NY 13202 Mr. William M. Flynn, President New York State Energy, Research, and Development Authority Corporate Plaza West 286 Washington Avenue Extension Albany, NY 12203-6399