ML17054A457
| ML17054A457 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 02/03/1984 |
| From: | Novak T Office of Nuclear Reactor Regulation |
| To: | Rhode G NIAGARA MOHAWK POWER CORP. |
| References | |
| NUDOCS 8402160606 | |
| Download: ML17054A457 (6) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 February 3, 1984 Docket No.:
50-410 Hr. Gerald K. Rhode Senior Vice President 300 Erie. Boulevard liest
- Syracuse, New York 13202
Dear Hr. Rhode:
Subject:
Probable Maximum Precipitation (PMP) for Nine Mile Point Nuclear Station, Unit 2 On August 12, 1983, in a letter from A. Schwencer, we requested, in the Hydrology Section, that Niagara Mohawk Power Corporation (NHPC) provide information on the effects of PMP as determined from NOAA Hydrometeorological Reports 51 and 52.
This PHP is considerably higher than the PMP rate of 8.4 inches per hour as stated in the FSAR.
Your response in Amendment 7 to the FSAR submitted December 16,
- 1983, indicated that your calculated rainfall rate of 8.4 inches per hour was developed from NOAA Hydrometeorological Report No.
33 which was approved at the construction permit stage.
On November 22, 1983, during a meeting on administrative matters, the NRC staff discussed with representatives of NMPC the use of Hydrometeorology Reports.51 and 52 for determining PMP.
During that meeting, the NRC staff noted that Hydrometeorology Reports 51 and 52 contain updated information and more advanced methodology to determine the PHP.
The staff also noted that although Hydrometeorology Report No.
33 is mentioned in the Standard Review Plan (SRP),
NUREG-0800, the SRP also states that the latest methodology should be used when appropriate in determining PMP.
The NRC staff further stated that the use of these later reports had been evaluated with respect to the SRP and determined to be in conformance with the SRP.
The staff's review procedures for evaluating flood levels have been and continue to be based on a
PMP event.
In our independent assessment of Nine Mile Point 2, we used current Corp of Engineering and National Weather Service methodology to determine the PMP depth.
The an'alytical methods used by the staff are in accordance with generally accepted hydrological priniciples and procedures.
Consideration of improvements in calculational methods is specially addressed in NUREG-0800 (SRP), Section 2.4.2 under "Review Procedures".
- However, NUREG-0800 provides for considerable flexibilityin resolving potential flooding problems, recognizing that at the operating license stage the range of solutions may be limited by the status of plant construction.
The primary focus is in assuring the capability of the plant to safely shutdown.
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Mr. Gerald K. Rhode Estimates of potential flooding problems, based on PMP, constitute a
potential safety problem that must be addressed.
In light of the information-provided above, and considering the discussion held during the meeting on November 22,
- 1983, we believe your responses provided in Amendment 7 to the requests for additional information concerning PMP are inadequate.
These responses should be revised to include a
PMP rate determined in accordance with Hydrometeorology Reports 51 and 52.
In order to support the licensing schedule for the SER, this information should be submitted to the NRC as an FSAR amendment no later than May 15, 1984.
If there are objections to use of Hydrometeorological Reports 51 and 52 in determining your PMP for Nine Mile Point 2 you should notify, in writing, Mr. Darrell G. Eisenhut, Director, Division of Licensing, of your desire for informal appeal meetings with the staff.
If you have any questions concerning the above information, please call the Licensing Project Manager, Mary F.
Haughey at (301) 492-7897.
Sincerely, cc:
See next page 0+4ginsl Skgngg Qyj Thomas M. Novak, Assistant Director for Licensing Division of Licensing DIST RIB UT.ION:,
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Nine Mile Point 2 Mr. Gerald K. Rhode Senior Vice President, Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202 CC:
Mr. Troy B. Conner, Jr.,
Esq.
Conner
& Wetterhahn Suite 1050 1747 Pennsylvania
- Avenue, N.W.
Washington, D. C.
20006 Mr. Richard Goldsmith Syracuse Uni versi tg College of Law E. I. White HalT Campus
- Syracuse, New Yor k 13210 Mr. Jay Dunkleberger, Director Technological Development Programs New York State Energy Office Agency Building 2 Empire State Plaza
- Albany, New York 12223 Ezra I. Bialik Assistant Attorney General Environmental Protection Bureau New York State Departaant of Law 2 World Trade Center New York, New York 10047 Resident Inspector Nine Mile Point Nuclear Power Station P. 0. Box 99
- Lycoming, New York 13093 Mr. John W. Keib, Esq.
Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202 Jay M. Gutierrez, Esq.
U. S. Nuclear Regulatory Coomission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406
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