ML19322C072
| ML19322C072 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 12/01/1975 |
| From: | Zech G Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912300054 | |
| Download: ML19322C072 (4) | |
Text
l Meeting Summary for Duke Power Co.
3 December 1, 1975 cc: Licensee H. Denton NRC PDR B. Grimes Local PDR M. B. Spangler R. C. DeYoung R. L. Ballard D. B. Vascallo J. Kastner W. R. Bulter W. P. Gammill
- 0. D. Parr Project Manager V. A. Moore Attorney, OELD J. F. Stolz OISE (3)
K. Kniel S. M. Sheppard A. Schwencer NRC Participants D. J. Skovholt R. Fraley, ACRS (16)
P. F. Collins T. B. Abernathy, DTIE R. H. Vollmer D. Eisenhut R. W. Houston B. Rusche K. R. Goller E. Case R. A. Purple R. Boyd D. L. Ziemann EP Project Manager G. Lear kcketFile R. Reid NRR RM ing '
R. P. Denise J. R. Buchanan R. A. Clark T. P. Speis D. R. Muller G. W. Knighton G. k. Dicker B. J. Youngblood W. H. Regan S. Varga T. J. Carter R. Heineman R. L. Tedesco J. Collins G. Lainas V. Benaroya R. R. Maccary J. P. Knight S. S. Pawlicki L. C. Shao t
V. Stello D. F. Ross T. M. Hovak T. A. Ippolito 1
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w UNITED STATES NUCLEAR REGULATORY COMMISSION W ASHINGToN, D. C. 20555 DOCKET NOS.:
50-269/270/287 DATE: December 1, 1975 LICENSEE:
Duke Power Company (DPC)
FACILITY:
Oconee Units 1, 2, and 3
SUMMARY
OF MEETING HELD ON NOVEMBER 20, 1975, TO DISCUSS BORON DILITTION AND LONG-TERM COOLING PROVISIONS OF THE OCONEE NUCLEAR STATION EVALUATION On November 20, 1975, representatives of DPC met with the NRC staff to discuss the licensee's ECCS evaluation with particular emphasis on the proposed means to prevent boron precipitation during the long-term cooling period following a postulated Loss of Coolant Accident (LOCA).
A list of Attendees is enclosed.
Significant discussions / agreements are summarized below.
The licensee was informed that the permanent modifications as described in their Ictter of October 31, 1975, would assure boron dilution following Of concern, however, was a postulated LOCA and are therefore acceptable.
the length of time they indicated as necessary to procure the required materials and to make the modifications. During this period (in excess of two years) other interim neasures would be needed to assure boron The dilution and thus satisfy the criteria of 10 CFR 50, Appendix K.
interim measures, also proposed in their letter of October 31, 1975, do not meet the single failure criteria of Appendix K and are therefore In addition, the leakage gaps, as described in Babcock not acceptable.
6 Wilcox Topical Report 10091, between the core outlet nozzles and the core support shield have not been shown to provide adequate assurance for boron dilution and are therefore not acceptable as an interim or long-term boron dilution measure.
The staff indicated that a single failure proof combination of one or more of the 3 modes as described in their letter of April 16, 1975,, would The licensee meet the requirements for an interim boron dilution method.
stated that they had reviewed their systems and that they would not be able to implement the 3 modes as an interim boron dilution measure due In view of this, the staff indicated to system operating requirements.
that some other means would therefore be required to meet the Appendix K criteria before the Oconee ECCS evaluation could be approved.
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The staff recommended that the licensee conduct an additionni review of their systems and attempt to identify some other interim boron dilution i
lineup not yet. considered.
It was also suggested that the licensee s
investigate other sources of supply for the materials needed for the
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permanent modifications and attempt to expedite delivery.
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, December 1, 1975 In the event the licensee is not able to propose an interim means of assuring boron dilution, the licensee was advised that a request for exemption from the requirements of 10 CFR 50.46 might reload of the units.
d Gary G. Zech, Project Manager Operating Reactors Branch #1 l
Division of Reactor Licensing
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Enclosure:
List of Attendees i
cc: See next page i
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NRC STAFF MEETING WITH i
J DUKE POWER COMPANY NOVEMBER 20,~ 1975 I
i NRC i
- R. A. Purple I
G. G. Zech G. R. Mazetis DPC i
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u D. Holt l
M. Tuckman R. Sharpe 4
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