ML16266A146
| ML16266A146 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 11/21/1991 |
| From: | Wiens L Office of Nuclear Reactor Regulation |
| To: | Hampton J DUKE POWER CO. |
| References | |
| TAC-M81536, TAC-M81537, TAC-M81538, NUDOCS 9112060188 | |
| Download: ML16266A146 (3) | |
Text
November 21, 1991 tDocket Nos. 50-269, 50-270, DISTRIBUTION and 50-287 Docket File NRC/Local PDRs Mr. J. W. Hampton PDII-3 Reading Vice President, Oconee Site Oconee Reading Duke Power Company LWiens P. 0. Box 1439 LBerry Seneca, South Carolina 29679 DMatthews
Dear Mr. Hampton:
SUBJECT:
REPAIR OF STEAM GENERATOR EXPLOSIVE PLUGS BY USE OF ORIFICE PLUGS OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 (TACS M81536/M81537/M81538)
In a letter dated September 3, 1991, Duke Power Company requested an interpretation of Oconee Technical Specification 4.17.5.f relating to the use of orifice plugs in meeting the requirement to remove tubes from service by plugging in the case of tubes which contain potentially defective explosive plugs, The NRC staff has identified the need for additional information relating to this request. Your response to the following two items is requested within 15 days from receipt of this letter.
- 1. Your request states that the orifice plug would limit primary-to-secondary leakage to about 0.2 gpm per tube, assuming the tube becomes fully ruptured and the explosive plug fails. Please provide the calculations supporting the value of 0.2 gpm, including orifice dimensions, assumed pressures upstream and downstream of the orifice, and the orifice coefficient used in the flow rate computation.
- 2.
Part of the safety consideration determination for this issue is that "The orifice plugs limit total primary-to-secondary leakage to a small fraction of that considered in the FSAR MSLB analysis, which evaluates rupture of 1, 3, and 10 SG tubes."
Please provide the calculations supporting this determination.
This requirement affects fewer than ten respondents, and therefore, it is not subject to Office of Management and Budget review under P.L.96-511.
If you have questions regarding this request, contact me at (301) 492-1495.
Sincerely,
/s/
Leonard A. Wiens, Project Manager Project Directorate 11-3 AA Division of Reactor Projects -
I/IT Office of Nuclear Reactor Regulation cc: See next ge
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OFC
- PDII-3/LA P
- PDI-3/
NAME : LBerry:lb L iens DMatt e s DATE : 11/,0/91
- 11/947/91
- i/t.(/91 OFFICIAL RECORD COPY Document Name:
OCONEE PLUGS 911206018 911121 PDR ADOCK 05000269 P
0 oUNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 November 21, 1991 Docket Nos. 50-269, 50-270, and 50-287 Mr. J. V. Hampton Vice President, Oconee Site Duke Power Company P. 0. Box 1439 Seneca, South Carolina 29679
Dear Mr. Hampton:
SUBJECT:
REPAIR OF STEAM GENERATOR EXPLOSIVE PLUGS BY USE OF ORIFICE PLUGS OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 (TACS M81536/M81537/M81538)
In a letter dated September 3, 1991, Duke Power Company requested an interpretation of Oconee Technical Specification 4.17.5.f relating to the use of orifice plugs in meeting the requirement to remove tubes from service by plugging in the case of tubes which contain potentially defective explosive plugs, The NRC staff has identified the need for additional information relating to this request. Your response to the following two items is requested within 15 days from receipt of this letter.
- 1. Your request states that the orifice plug would limit primary-to-secondary leakage to about 0.2 gpm per tube, assuming the tube becomes fully ruptured and the explosive plug fails. Please provide the calculations supporting the value of 0.2 gpm, including orifice dimensions, assumed pressures upstream and downstream of the orifice, and the orifice coefficient used in the flow rate computation.
- 2. Part of the safety consideration determination for this issue is that "The orifice plugs limit total primary-to-secondary leakage to a small fraction of that considered in the FSAR MSLB analysis, which evaluates rupture of 1, 3, and 10 SG tubes." Please provide the calculations supporting this determination.
This requirement affects fewer than ten respondents, and therefore, it is not subject to Office of Management and Budget review under P.L.96-511.
If you have questions regarding this request, contact me at (301) 492-1495.
Sincerely, Leonard A. Wiens, Project Manager Project Directorate 11-3 Division of Reactor Projects - T/11 Office of Nuclear Reactor Regulation cc: See next page
Mr. 0. W. Hampton Duke Power Company Oconee Nuclear Station cc:
Mr. A. V. Carr, Esq.
Mr. M. E. Patrick Duke Power Company Compliance 422 South Church Street Duke Power Company Charlotte, North Carolina 28242-0001 Oconee Nuclear Site P.O. Box 1439 Seneca, South Carolina 29679 J. Michael McGarry, III, Esq.
Winston and Strawn Mr. Alan R. Herdt, Chief 1400 L Street, NW.
Project Branch #3 Washington, DC 20005 U. S. Nuclear Regulatory Commission 101 Marietta Street, NW., Suite 2900 Mr. Robert B. Borsum Atlanta, Georgia 30323 Babcock & Wilcox Nuclear Power Division Ms. Karen E. Long Suite 525 Assistant Attorney General 1700 Rockville Pike N. C. Department of Justice Rockville, Maryland 20852 P.O. Box 629 Raleigh, North Carolina 27602 Manager, LIS NUS Corporation Mr. R. L. Gill, Jr.
2650 McCormick Drive, 3 Floor Licensing Clearwater, Florida 34619-1035 Duke Power Company P. 0. Box 1007 Senior Resident Inspector Charlotte, North Carolina 28201-1007 U. S. Nuclear Regulatory Commission Route 2, Box 610 Seneca, South Carolina 29678 Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, NW., Suite 2900 Atlanta, Georgia 30323 Mr. Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 Office of Intergovernmental Relations 116 West Jones Street Raleigh, North Carolina 27603 County Supervisor of Oconee County Walhalla, South Carolina 29621