ML073310170
| ML073310170 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 12/04/2007 |
| From: | David M NRC/NRR/ADRO/DORL/LPLI-1 |
| To: | Polson K Nine Mile Point |
| david marshall NRR/DORL 415-1547 | |
| References | |
| TAC MD6280 | |
| Download: ML073310170 (4) | |
Text
December 4, 2007 Mr. Keith J. Polson Vice President Nine Mile Point Nine Mile Point Nuclear Station, LLC P.O. Box 63 Lycoming, NY 13093
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING NINE MILE POINT NUCLEAR STATION, UNIT NO. 2, REVISION TO DRYWELL SPRAY NOZZLE TESTING FREQUENCY (TAC NO. MD6280)
Dear Mr. Polson:
By letter dated July 30, 2007, Nine Mile Point Nuclear Station, LLC requested an amendment to the Nine Mile Point Nuclear Station, Unit No. 2 Renewed Facility Operating License. The requested license amendment would revise Technical Specification Surveillance Requirement 3.6.1.6.3 by changing the testing frequency for drywell spray nozzles from "10 years" to "following maintenance that could result in nozzle blockage."
The Nuclear Regulatory Commission (NRC) staff has reviewed the information provided in that letter and has determined that additional information is needed to complete its review.
Enclosed is the NRC staffs request for additional information (RAI). The RAI was discussed with your staff on November 13, 2007, and it was agreed that your response would be provided within 30 days from the date of this letter.
Sincerely,
/RA/
Marshall J. David, Project Manager Plant Licensing Branch I-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-410
Enclosure:
RAI cc w/encl: See next page
December 4, 2007 Mr. Keith J. Polson Vice President Nine Mile Point Nine Mile Point Nuclear Station, LLC P.O. Box 63 Lycoming, NY 13093
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING NINE MILE POINT NUCLEAR STATION, UNIT NO. 2, REVISION TO DRYWELL SPRAY NOZZLE TESTING FREQUENCY (TAC NO. MD6280)
Dear Mr. Polson:
By letter dated July 30, 2007, Nine Mile Point Nuclear Station, LLC requested an amendment to the Nine Mile Point Nuclear Station, Unit No. 2 Renewed Facility Operating License. The requested license amendment would revise Technical Specification Surveillance Requirement 3.6.1.6.3 by changing the testing frequency for drywell spray nozzles from "10 years" to "following maintenance that could result in nozzle blockage."
The Nuclear Regulatory Commission (NRC) staff has reviewed the information provided in that letter and has determined that additional information is needed to complete its review.
Enclosed is the NRC staffs request for additional information (RAI). The RAI was discussed with your staff on November 13, 2007, and it was agreed that your response would be provided within 30 days from the date of this letter.
Sincerely,
/RA/
Marshall J. David, Project Manager Plant Licensing Branch I-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-410
Enclosure:
RAI cc w/encl: See next page DISTRIBUTION:
PUBLIC RidsNrrPMMDavid RidsNrrDssScvb RidsNrrAcrsAcnwMailCenter LPLI-1 RidsNrrLASLittle RidsOGCRp RidsRgn1MailCenter Accession Number.: ML073310170 NRR-088 OFFICE LPLI-1/PM LPLI-1/LA SCVB/BC*
LPLI-1/BC NAME MDavid SLittle RDennig MKowal DATE 12/04/07 11/28/07 11/21/07 12/04/07
- RAIs transmitted by memo dated 11/21/07.
OFFICIAL RECORD COPY
Nine Mile Point Nuclear Station, Unit No. 2 cc:
Mr. Michael J. Wallace, President Constellation Energy Nuclear Group, LLC 750 East Pratt Street, 18th Floor Baltimore, MD 21202 Mr. John M. Heffley Senior Vice President and Chief Nuclear Officer Constellation Energy Nuclear Generation Group 111 Market Place Baltimore, MD 21202 Mr. Terry F. Syrell Director, Licensing Nine Mile Point Nuclear Station P.O. Box 63 Lycoming, NY 13093 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 126 Lycoming, NY 13093 Supervisor Town of Scriba Route 8, Box 382 Oswego, NY 13126 Charles Donaldson, Esquire Assistant Attorney General New York Department of Law 120 Broadway New York, NY 10271 Mr. Paul D. Eddy New York State Department of Public Service 3 Empire State Plaza, 10th Floor Albany, NY 12223 Mark J. Wetterhahn, Esquire Winston & Strawn 1700 K Street, NW Washington, DC 20006 Carey W. Fleming, Esquire Sr. Counsel - Nuclear Generation 750 East Pratt Street, 17th Floor Constellation Energy Nuclear Group, LLC Baltimore, MD 21202 Mr. John P. Spath New York State Energy, Research, and Development Authority 17 Columbia Circle Albany, NY 12203-6399 Mr. Paul Tonko President and CEO New York State Energy, Research, and Development Authority 17 Columbia Circle Albany, NY 12203-6399 Mr. James R. Evans LIPA P.O. Box 129 Lycoming, NY 10393
Enclosure REQUEST FOR ADDITIONAL INFORMATION NINE MILE POINT NUCLEAR STATION, UNIT NO. 2 REVISION TO DRYWELL SPRAY NOZZLE TESTING FREQUENCY The Nuclear Regulatory Commission (NRC) staff has performed its initial review of your July 30, 2007, request to revise Nine Mile Point Nuclear Station, Unit No. 2 Technical Specification (TS) Surveillance Requirement (SR) 3.6.1.6.3 by changing the testing frequency for drywell spray nozzles from "10 years" to "following maintenance that could result in nozzle blockage." As a result of that review, the NRC staff has determined that additional information is required to adequately evaluate the acceptability of the proposed changes.
- 1. The request states that pre-operational testing in 1986 and subsequent tests in 1992 and 1998 indicate no blockage of the spray nozzles. However, at the initiation of the air flow tests, a momentary fine dark orange cloud (assumed to be rust particles) was observed exiting the nozzles. The request attributes this to a small amount of water entering the system during quarterly stroke testing of the isolation valves. The request further states that the method of stroke testing will be revised to ensure that the drywell spray system remains dry.
Are the revisions to the method of stroke testing in effect, now? Please explain the revisions and how they ensure that water does not enter the system?
Are the headers equipped with any drains to remove water that inadvertently enters the system?
What action will be taken if water enters the spray piping upstream of the nozzles?
- 2. The request states that the drywell spray nozzle orifices have a 1.0156 inch diameter and are designed to pass up to a 1.0 inch diameter particle without clogging. Please provide a drawing or a sketch of a nozzle and a brief description of how spray is achieved by nozzles that are larger than 1.0 inch.
- 3. The request states that piping to the nozzles is Type SA106 Grade B carbon steel. Please explain the extent of the carbon steel piping upstream of the nozzles in quantitative terms (e.g. size, length) and why the pipes are not expected to rust, significantly.
- 4. The current TS SR 3.6.1.6.3 requires verification that each drywell spray nozzle is unobstructed every 10 years. The request proposes to change the surveillance frequency from 10 years to following maintenance that could result in nozzle blockage. Please explain and justify the verification methods that will be employed to accomplish this SR.