ML14183A811
| ML14183A811 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 08/26/1997 |
| From: | Mozafari B Office of Nuclear Reactor Regulation |
| To: | Keenan J Carolina Power & Light Co |
| References | |
| TAC-M98953 NUDOCS 9709020280 | |
| Download: ML14183A811 (3) | |
Text
UNITED STATES 0
NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-001 August 26, 1997 Mr. J. S. Keenan, Vice President Carolina Power & Light Company H. B. Robinson Steam Electric Plant, Unit No. 2 3581 West Entrance Road Hartsville, South Carolina 29550
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION CONCERNING THE ANALYSIS OF THE EMERGENCY CORE COOLING SYSTEM SWITCHOVER FROM INJECTION TO RECIRCULATION PHASE AT THE H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 (TAC M98953)
Dear Mr. Keenan:
As a result of an inspection at your H. B. Robinson Steam Electric Plant, Unit No. 2 (HBR),
we understood that an emergency operating procedure (EOP) for the emergency core cooling system (ECCS) switchover allows your operators 30.5 minutes to complete the transfer from injection to recirculation phase cooling (switchover). The switchover procedure involves the manual operation of 22 local valves within the allotted time interval. It is our understanding that the 30.5 minutes is based on an analysis that showed the peak clad temperature (PCT) would remain below 2200*F during the switchover process and that the other criteria of 50.46 were met. According to our understanding of this analysis, at 30.5 minutes the PCT is expected to be 2102*F. This heatup to 2102*F would constitute a heatup in addition to that normally analyzed in accordance with 10 CFR 50 Appendix K (i.e, during the blowdown and reflood phase of the accident). The analysis also shows that the cladding temperature is reduced to around 300*F following the initial heatup but prior to this heatup associated with switchover.
We request that you justify the implementation of this procedure with respect to the effects that thermal cycling would have on the fuel cladding and, particularly, criterion (4) "coolable geometry," of 10 CFR 50.46. We further request that you provide a discussion, results, and references to cladding performance tests/experiments that have been performed to support your conclusions.
9709020280 970826 PDR ADOCK 05000261 P
Mr. J. Keenan-
-2 Your response is requested within the next 30 days. We are prepared to meet with you to discuss your response on this issue. Should you have any questions, do not hesitate to contact me at 301-415-2020, or by email at blm@nrc.gov.
Sincerely, (Original Signed By)
Brenda Mozafari, Project Manager Project Directorate 11-1 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation Docket No. 50-261 cc: See next page DISTRIBUTION:
-DocketFilen-TCollins PUBLIC PDII-1 Reading OGC BBoger ACRS MShymlock MShuaibi JJohnson, RII FILENAME - G:\\ROBINSON\\ROB98953.RAI OFFICE PM:PDII-1 LA:PDII-1 (A)PD:PDIl-1__
NAME BMozafa Dunn gon GEdison DATE J
6/97 8/26/97 8/26/97/
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00 Mr. J. S. Keenan H. B. Robinson Steam Electric Carolina Power & Light Company Plant, Unit No. 2 cc:
Mr. William D. Johnson Mr. Mel Fry. Acting Director Vice President and Senior Counsel N.C. Department of Environment, Carolina Power & Light Company Health and Natural Resources Post Office Box 1551 Division of Radiation Protection Raleigh, North Carolina 27602 3825 Barrett Dr.
Raleigh, North Carolina 27609-7721 Ms. Karen E. Long Assistant Attorney General Mr. Robert P. Gruber State of North Carolina Executive Director Post Office Box 629 Public Staff - NCUC Raleigh, North Carolina 27602 Post Office Box 29520 Raleigh, North Carolina 27626-0520 U.S. Nuclear Regulatory Commission Resident Inspector's Office Mr. Max Batavia, Chief H. B. Robinson Steam Electric Plant South Carolina Department of Health 2112 Old Camden Road Bureau of Radiological Health Hartsville, South Carolina 29550 and Environmental Control 2600 Bull Street Regional Administrator, Region II Columbia, South Carolina 29201 U.S. Nuclear Regulatory Commission Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85 Ms. D. B. Alexander Atlanta, Georgia 30303 Manager Performance Evaluation and Mr. J. W. Moyer Regu]atory Affairs Plant General Manager Carolina Power & Light Company Carolina Power & Light Company 412 S. Wilmington Street H. B. Robinson Steam Electric Plant Raleigh, North Carolina 27601 Unit No. 2 3581 West Entrance Road Hartsville, South Carolina 29550 Mr. Milton Shymlock U. S. Nuclear Regulatory Commission Public Service Commission Atlanta Federal Center State of South Carolina 61 Forsyth St.. SW, Suite 23185 Post Office Drawer 11649 Atlanta, Georgia 30303 Columbia, South Carolina 29211 Mr. M. M. Wilkerson Manager - Regulatory Affairs Mr. H. K. Chernoff Carolina Power & Light Company Supervisor, Licensing/Regulatory Programs H. B. Robinson Steam Electric Plant, Carolina Power & Light Company Unit No. 2 H. B. Robinson Steam Electric Plant.
3581 West Entrance Road Unit No. 2 Hartsville, South Carolina 29550-0190 3581 West Entrance Road Hartsville, South Carolina 29550