ML16131A436
| ML16131A436 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/14/1993 |
| From: | Wiens L Office of Nuclear Reactor Regulation |
| To: | Hampton J DUKE POWER CO. |
| References | |
| TAC-M86033, TAC-M86034, TAC-M86035, NUDOCS 9304200365 | |
| Download: ML16131A436 (5) | |
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April 14, 1993 Docket Nos. 50-269, 50-270 DISTRIBUTION and 50-287 Docket File D.Hagan NRC/Local PDRs G.Hill (6)
PDII-3 RF W.Jones Mr. J. W. Hampton S.Varga C.Grimes Vice President, Oconee Site D.Matthews ACRS (10)
Duke Power Company L.Wiens OPA P. 0. Box 1439 L. Berry OC/LFDCB Seneca, South Carolina 29679 OGC E.Merschoff,RII
Dear Mr. Hampton:
SUBJECT:
PROPOSED REVISION TO TECHNICAL SPECIFICATION BASES FOR OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 (TAC NOS. M86033, M86034, AND M86035)
In a letter dated February 18, 1993, Duke Power Company (DPC) informed the Nuclear Regulatory Commission of changes to the Technical Specification (TS)
Bases for Oconee Nuclear Station, Units 1, 2, and 3. These changes involve revisions regarding the concentrated boric acid storage tank and associated flowpaths. DPC stated that a 10 CFR 50.59 evaluation of the changes was made and that DPC had concluded that the changes did not involve an unreviewed safety question. The NRC staff has reviewed the changes and concur with that conclusion.
For administrative purposes, the TS Bases changes need to be provided to the staff to enable all copies of the Oconee TS to be updated in a consistent fashion. The revised TS Bases pages are enclosed.
If you have questions regarding this matter, contact me at (301) 504-1495.
Sincerely,
/s/
L. A. Wiens, Project Manager Project Directorate 11-3 Division of Reactor Projects -
I/II Office of Nuclear Reactor Regulation
Enclosure:
TS Bases pages cc w/enclosure:
See next page OFFICE PDII-3/
P I SRXB____
NAME L. BERRAN S.
REonesNS DATE
/
93
/17493
/
3 OFFICIAL RECORD COPY FILE NAME: G:\\OCONEE\\TSBASES 9304200365 930414 PDR ADOCK 05000269 P
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 April 14, 1993 Docket Nos.
50-269, 50-270 and 50-287 Mr. J. W. Hampton Vice President, Oconee Site Duke Power Company P. 0. Box 1439 Seneca, South Carolina 29679
Dear Mr. Hampton:
SUBJECT:
PROPOSED REVISION TO TECHNICAL SPECIFICATION BASES FOR OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 (TAC NOS. M86033, M86034, AND M86035)
In a letter dated February 18, 1993, Duke Power Company (DPC) informed the Nuclear Regulatory Commission of changes to the Technical Specification (TS)
Bases for Oconee Nuclear Station, Units 1, 2, and 3. These changes involve revisions regarding the concentrated boric acid storage tank and associated flowpaths. DPC stated that a 10 CFR 50.59 evaluation of the changes was made and that DPC had concluded that the changes did not involve an unreviewed safety question. The NRC staff has reviewed the changes and concur with that conclusion.
For administrative purposes, the TS Bases changes need to be provided to the staff to enable all copies of the Oconee TS to be updated in a consistent fashion. The revised TS Bases pages are enclosed.
If you have questions regarding this matter, contact me at (301) 504-1495.
Sincerely, L. A. Wiens, Project Manager Project Directorate 11-3 Division of Reactor Projects -
I/II Office of Nuclear Reactor Regulation
Enclosure:
TS Bases pages cc w/enclosure:
See next page
Mr. J. W. Hampton Duke Power Company Oconee Nuclear Station cc:
Mr. A. V. Carr, Esquire Mr. M. E. Patrick Duke Power Company Compliance 422 South Church Street Duke Power Company Charlotte, North Carolina 28242-0001 Oconee Nuclear Site P. 0. Box 1439 J. Michael McGarry, III, Esquire Seneca, South Carolina 29679 Winston and Strawn 1400 L Street, NW.
Mr. Alan R. Herdt, Chief Washington, DC 20005 Project Branch #3 U. S. Nuclear Regulatory Commission Mr. Robert B. Borsum 101 Marietta Street, NW. Suite 2900 Babcock & Wilcox Atlanta, Georgia 30323 Nuclear Power Division Suite 525 Ms. Karen E. Long 1700 Rockville Pike Assistant Attorney General Rockville, Maryland 20852 North Carolina Department of Justice Manager, LIS P. 0. Box 629 NUS Corporation Raleigh, North Carolina 27602 2650 McCormick Drive, 3rd Floor Clearwater, Florida 34619-1035 Mr. G. A. Copp Licensing -
EC050 Senior Resident Inspector Duke Power Company U. S. Nuclear Regulatory Commission P. 0. Box 1006 Route 2, Box 610 Charlotte, North Carolina 28201-1006 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
cas es The high pressure injection system and chemical addition system provide control of the -eactor coolant system boron concentration.(1)
This is normally accomplished by using any of the three high pressure injection pumps in series with a boric acid pump associated with either the boric acid mix tank or the concentrated boric acid storage tank (CBAST) or a bleed transfer pump aligned to take suction from the CBAST. The boric acid pump associated with the CBAST is normally used for small additions during operation-and the bleed transfer pumps are utilized when larger volumes are to be added.
An alternate method of boration will be the use of the high pressure injection pumps taking suction directly from the borated water storage tank (BWST).(2)
The quantity of boric acid in storage in the CBAST or the BWST is sufficient to borate the reactor coolant system to a 1% Ak/k subcritical margin at cold conditions (70*F) with the maximum worth stuck rod and no credit for xenon at the worst time in core life.
The current cycles for each unit are analyzed with the limits presented in the Core Operating Limits Report.
The cycle specific analyses determine the volume and boron concentration requirements for the BWST and CBAST necessary to borate to cold shutdown.
The volume requirements include a 10% margin and, in addition, allow for a deviation of 10 EFPD in the cycle length.
The specification assures that two supplies are available whenever the reactor is critical so that a single failure will not prevent boration to a cold condition.
One of the supplies requires the operability of the CBAST with an associated pump and flow path to ensure the capability to borate the RCS to a cold condition.
This requirement is not one which must be inmediately available since the shortest required timeframe to reach cold conditions is 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.(3) Thus the required boric acid from the CBAST can be added by either of the bleed transfer pumps manually aligned to take suction from the CBAST and discharging to the inlet of the makeup filters at nominal flow rates of 100 gpm. Since there is sufficient time to make the alignment, manual alignment of the bleed transfer pumps is acceptable.
This flow path and the associated pumps are equivalent from safety-related and seismic criteria to that of the CBAST pump and are capable of adding the required volume from the CBAST well within the minimum.6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
Equivalent volumes with lower concentrations will take longer than those volumes with higher concentrations, however, both can be added within the required timeframe.
During operation, the CBAST pump is normally aligned to the CBAST and discharges to the inlet of the makeup filters.
Each CBAST pump is capable of delivering the required boric acid to the RCS within the required timeframe at a minimum flow of 7 gpm.
Small volume additions from the CBAST will normally be added with the CBAST pump with the bleed transfer pumps being utilized for larger volume additions.
An alternate method of addition is to inject boric acid from the BWST using the high pressure injection pumps.
The concentration of boron in the CBAST may be higher than the concentration which would crystallize at ambient conditions.
For this reason, and to assure a flow of boric acid is available when needed, these tanks and the associated piping for the flowpaths will be kept at least 10'F above the crystallization temperature for the concentration present. Once in the high pressure injection system. the concentrate is sufficiently well mixed and diluted so that normal system temperatures assure boric acid solubility.
Oconee 1, 2. and 3 3.2-2 Revised by NRC Letter dated April 14, 1993
REFERENCES (1) 7SAR. Sections 9.3.1. and 9.3.2 (2)
FSAR. Figure 6.0.2 (3)
Technical Specification 3.0 Oconee 1, 2, and 3 3.2-3 Revised by NRC Letter dated April 14, 1993