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Text
April 2, 2002 LICENSEE: SOUTHERN NUCLEAR OPERATING COMPANY FACILITY: EDWIN I. HATCH NUCLEAR PLANT
SUBJECT:
MEETING WITH SOUTHERN NUCLEAR TO DISCUSS HATCH AMENDMENT REQUEST TO EXTEND COMPLETION TIMES FOR INOPERABLE EMERGENCY DIESEL GENERATORS (TAC NOS. MB2886 AND MB2887)
On March 8, 2002, members of the Nuclear Regulatory Commission and Southern Nuclear Operating Company (the licensee) met in Rockville, Maryland to discuss the August 31, 2001, amendment request to extend the completion times for inoperable emergency diesel generators (EDGs) for Edwin I. Hatch Nuclear Plant, Units 1 and 2. A list of attendees is provided in the attachment. The handouts provided by the licensee during the meeting are accessible electronically from the Agencywide Documents and Management System (ADAMS) Public NRC website, http://www.nrc.gov/reading-rm/adams/html under accession number ML020700545.
Persons who do not have access to ADAMS or who encounter problems in accessing the documents located in ADAMS, should contact the NRC PDR Reference staff by telephone at 1-800-397-4209 or 301-415-4737, or by e-mail to pdr@nrc.gov.
The August 31, 2001, submittal requested amendments to the Technical Specifications (TS) that would allow extension of the completion times for the required actions associated with inoperable EDGs from 7 days to 14 days for the swing EDG and from 3 days to 14 days for the other four EDGs. The licensee requested the amendments so that preventive maintenance of the EDGs could be performed during power operation rather than during refueling outages (this could result in shorter refueling outages) and to reduce the need for emergency TS changes that could arise when an EDG become inoperable.
The licensee stated that the evaluation performed to support its August 31, 2001, submittal used the approach described in Regulatory Guides (RG) 1.174 and 1.177. The licensee stated that the Hatch risk management process includes the key elements of RG 1.177 and is based on Section (a)(4) of 10 CFR 50.65, Requirements for monitoring the effectiveness of maintenance at nuclear power plants.
The licensee discussed its risk management program which would limit the other equipment that could be out of service during the times when an EDGs is inoperable. This program could result in a plant shutdown if the risk associated with out-of-service equipment was determined to be too high.
The staff noted that the Core Damage Frequency (CDF) and Large Early Release Frequency (LERF) results presented in the August 31, 2001, satisfied the guidance in RG 1.174.
Furthermore, the Incremental Conditional Core Damage Probability (ICCDP) satisfied the guidance in RG 1.177, but the Incremental Conditional Large Early Release Probability (ICLERP) exceeded the guidance in RG 1.177 The licensee stated that ICLERP exceeded the RG 1.177 guidance because of conservatisms in the calculations, rather than because of the
design of the plant. The licensee performed an engineering estimate for the C EDG (the most limiting EDG) using more realistic assumptions for battery power time, time to core uncovery and time to vessel failure. This estimate resulted in an ICLERP of approximately 7E-08; the guidance in RG 1.177 indicates an ICLERP of 5.0E-08. The ICLERP presented in the August 31, 2001, submittal was 1.15E-07. The licensee stated that this estimate is conservative due to the modeling of the switchyard and that a more realistic modeling of the switchyard would result in lower values of ICLERP. The licensee committed to send in a letter by March 15, 2002, documenting the results of this estimate and similar estimates for the other EDGs.
/RA/
Leonard N. Olshan, Project Manager, Section 1 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-321 and 50-366
Enclosure:
As stated cc w/encl: See next page
April 2, 2002 design of the plant. The licensee performed an engineering estimate for the C EDG (the most limiting EDG) using more realistic assumptions for battery power time, time to core uncovery and time to vessel failure. This estimate resulted in an ICLERP of approximately 7E-08; the guidance in RG 1.177 indicates an ICLERP of 5.0E-08. The ICLERP presented in the August 31, 2001, submittal was 1.15E-07. The licensee stated that this estimate is conservative due to the modeling of the switchyard and that a more realistic modeling of the switchyard would result in lower values of ICLERP. The licensee committed to send in a letter by March 15, 2002, documenting the results of this estimate and similar estimates for the other EDGs.
/RA/
Leonard N. Olshan, Project Manager, Section 1 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-321 and 50-366
Enclosure:
As stated cc w/encl: See next page DISTRIBUTION:
PUBLIC RLaufer OGC DMcCain PDII-1 R/F LOlshan MReinhart SRosenberg JZwolinksi/TMarsh CHawes JSchiffgens HBerkow ACRS MWohl Accession Number: ML020840726 OFC PDII-1/PM PDII-1/LA PDII-1/ASC NAME LOlshan CHawes RLaufer DATE 4/1/02 4/1/02 4/2/02 OFFICIAL RECORD COPY
ATTENDEES LIST MARCH 08, 2002 MEETING TO DISCUSS HATCH AMENDMENT REQUEST TO EXTEND COMPLETION TIMES FROM INOPERABLE EMERGENCY DIESEL GENERATORS NRC SOUTHERN NUCLEAR H. Berkow J. Anderson L. Olshan R. Bunt M. Reinhart W. Burns J. Schiffgens D. Crowe M. Wohl K. Fry E. Ingram T. Moore O. Vidal OTHER J. Lin, ABSG Consulting, Inc.
D. Pendry, Excel Services Corp.
Enclosure
Edwin I. Hatch Nuclear Plant cc:
Mr. Ernest L. Blake, Jr. Charles A. Patrizia, Esquire Shaw, Pittman, Potts Paul, Hastings, Janofsky & Walker and Trowbridge 10th Floor 2300 N Street, NW. 1299 Pennsylvania Avenue Washington, DC 20037 Washington, DC 20004-9500 Mr. D. M. Crowe Chairman Manager, Licensing Appling County Commissioners Southern Nuclear Operating County Courthouse Company, Inc. Baxley, Georgia 31513 P. O. Box 1295 Birmingham, Alabama 35201-1295 Mr. J. D. Woodard Executive Vice President Resident Inspector Southern Nuclear Operating Plant Hatch Company, Inc.
11030 Hatch Parkway N. P. O. Box 1295 Baxley, Georgia 31531 Birmingham, Alabama 35201-1295 Mr. Charles H. Badger Mr. P. W. Wells Office of Planning and Budget General Manager, Edwin I. Hatch Room 610 Nuclear Plant 270 Washington Street, SW. Southern Nuclear Operating Atlanta, Georgia 30334 Company, Inc.
U.S. Highway 1 North Harold Reheis, Director P. O. Box 2010 Department of Natural Resources Baxley, Georgia 31515 205 Butler Street, SE., Suite 1252 Atlanta, Georgia 30334 Mr. L. M. Bergen Resident Manager Steven M. Jackson Oglethorpe Power Corporation Senior Engineer - Power Supply Edwin I. Hatch Nuclear Plant Municipal Electric Authority P. O. Box 2010 of Georgia Baxley, Georgia 31515 1470 Riveredge Parkway, NW Atlanta, Georgia 30328-4684
