ML013540443
| ML013540443 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  (NPF-069) |
| Issue date: | 12/20/2001 |
| From: | Tam P NRC/NRR/DLPM/LPD1 |
| To: | Conway J Nine Mile Point |
| References | |
| TAC MB1163 | |
| Download: ML013540443 (4) | |
Text
December 20, 2001 Mr. John T. Conway Site Vice President Nine Mile Point Nuclear Station, LLC P.O. Box 63 Lycoming, NY 13093
SUBJECT:
NINE MILE POINT NUCLEAR STATION, UNIT NO. 2 - CORRECTION OF SAFETY EVALUATION ASSOCIATED WITH AMENDMENT NO. 99 (TAC NO. MB1163)
Dear Mr. Conway:
On October 17, 2001, the NRC staff issued Amendment No. 99 to Facility Operating License No. NPF-69 for Nine Mile Point Nuclear Station, Unit No. 2. The amendment revised surveillance requirements associated with Section 3.3.8.2, Reactor Protection System (RPS)
Electric Power Monitoring - Logic, and 3.3.8.3, Reactor Protection System (RPS) Electric Power Monitoring - Scram Solenoids.
Section 3.0 of the safety evaluation (SE) associated with Amendment No. 99 contains an inadvertent error. Specifically, the word overvoltage should not be present in the last sentence. Accordingly, the NRC staff is reissuing page 2 (enclosed) of the SE to correct this error in Section 3.0. We apologize for any inconvenience this inadvertent error may have caused you.
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:
Corrected page 2 of SE cc w/encl: See next page
December 20, 2001 Mr.John T. Conway Site Vice President Nine Mile Point Nuclear Station, LLC P.O. Box 63 Lycoming, NY 13093
SUBJECT:
NINE MILE POINT NUCLEAR STATION, UNIT NO. 2 - CORRECTION OF SAFETY EVALUATION ASSOCIATED WITH AMENDMENT NO. 99 (TAC NO. MB1163)
Dear Mr. Conway:
On October 17, 2001, the NRC staff issued Amendment No. 99 to Facility Operating License No. NPF-69 for Nine Mile Point Nuclear Station, Unit No. 2. The amendment revised surveillance requirements associated with Section 3.3.8.2, Reactor Protection System (RPS)
Electric Power Monitoring - Logic, and 3.3.8.3, Reactor Protection System (RPS) Electric Power Monitoring - Scram Solenoids.
Section 3.0 of the safety evaluation (SE) associated with Amendment No. 99 contains an inadvertent error. Specifically, the word overvoltage should not be present in the last sentence. Accordingly, the NRC staff is reissuing page 2 (enclosed) of the SE to correct this error in Section 3.0. We apologize for any inconvenience this inadvertent error may have caused you.
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:
Corrected page 2 of SE cc w/encl: See next page DISTRIBUTION:
PUBLIC ACRS OGC LRaghavan PDI-1RF WBeckner GHill (2)
BPlatchek, RI EAdensam PTam SLittle JKnox Accession Number: ML01 OFFICE PDI-1\\PM PDI-1\\LA PAI-1\\(A)SC NAME PTam SLittle LRaghavan*
DATE 12/20/01 12/20/01 12/20/01 OFFICIAL RECORD COPY
- P. Tam concurred for Raghavan and frequency conditions to which they may not be designed and qualified. The capability of the RPS to perform its safety function (trip and scram of the reactor on loss of alternating current power or in response to a reactor trip signal) is thus maintained. In addition, to minimize the potential for inadvertent trip of the EPAs (and thus minimize the potential for inadvertent trip of the reactor), the EPAs are also required to be designed such that they will not trip over the normal expected operating voltage and frequency ranges of the RPS power supply. Operation of the RPS power supplies within their normal operating voltage and frequency ranges should (within margin) not cause trip of the EPAs.
3.0 EVALUATION OF PROPOSED CHANGES The licensee proposed to make these changes to the TSs: (1) reduce the Allowable Values for overvoltage trip of the EPAs, and (2) reduce the frequency for performing Channel Calibration for the EPAs overvoltage, undervoltage, and underfrequency trip functions. The trip setpoints for undervoltage and underfrequency (and also allowable values for undervoltage and l underfrequency) are not affected by these proposed changes.
3.1 Reduce Allowable Values for Overvoltage Trip (Surveillance Requirement (SR) 3.3.8.2.2 and 3.3.8.3.2)
The licensee stated that these changes are proposed to correct previous non-conservative analysis deficiencies. The proposed changes are:
SR 3.3.8.2.2 - Reduce Bus A overvoltage Allowable Value from 133.8 V to 130.2 V, and Bus B from 133.8 V to 129.8 V.
SR 3.3.8.3.2 - Reduce Bus A overvoltage Allowable Value from 130.5 V to 127.6 V, and Bus B from 131.7 V to 127.6 V.
The EPAs overvoltage trip functions are based on protecting RPS essential loads (the RPS scram pilot valve solenoids and MSIV trip solenoids) from damage due to overheating by disconnecting their associated electrical buses from their power supplies when potentially damaging (abnormal) overvoltage conditions exist. The RPS scram pilot valve solenoids are the only essential loads powered from the RPS scram solenoid buses. The MSIV trip solenoids are the most limiting loads for postulated overvoltage conditions of the essential loads powered from the RPS logic buses. The licensees proposed overvoltage Allowable Values would provide protection from voltages that could be sufficiently high to cause insulation degradation due to overheating.
The overvoltage analytical limits for the EPAs are based on the highest possible voltages that would not exceed the manufacturers maximum continuous operating design ratings of the RPS scram pilot valve solenoids and MSIV trip solenoids. The licensee concluded that the proposed changes provide assurance that RPS essential loads will not exceed their maximum continuous operating ratings for postulated overvoltage conditions. As such, the proposed changes provide assurance that the EPAs will be capable of performing their protective safety functions.
This, in turn, will assure that the RPS essential loads will remain capable of performing their Corrected by letter dated 12/20/01 Enclosure
Nine Mile Point Nuclear Station Unit No. 2 cc:
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. 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 C. Adrienne Rhodes Chairman and Executive Director State Consumer Protection Board 5 Empire State Plaza, Suite 2101 Albany, NY 12223-1556 Mark J. Wetterhahn, Esquire Winston & Strawn 1400 L Street, NW.
Washington, DC 20005-3502 Mr. Robert E. Denton President Nine Mile Point Nuclear Station, LLC 1997 Annapolis Exchange Parkway Suite 500 Annapolis, MD 21401 Mr. Raymond L. Wenderlich Senior Constellation Nuclear Officer Responsible for Nine Mile Point Nine Mile Point Nuclear Station, LLC P.O. Box 63 Lycoming, NY 13093 James M. Petro, Jr., Esquire Counsel Constellation Power Source, Inc.
111 Market Place Suite 500 Baltimore, MD 21202 Mr. William M. Flynn, President New York State Energy, Research, and Development Authority Corporate Plaza West 286 Washington Avenue Extension Albany, NY 12203-6399