ML14190A845
| ML14190A845 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 03/14/1985 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Utley E CAROLINA POWER & LIGHT CO. |
| Shared Package | |
| ML14190A846 | List: |
| References | |
| TAC-49223, NUDOCS 8504020418 | |
| Download: ML14190A845 (3) | |
Text
March 14, 1985 DISTRIBUTION crbCket -ile, NRC PDR Docket No. 50-261 L PDR ORB#1 Rdg HThompson OELD EJordan BGrimes JPartlow GRequa CParrish ACRS 10 Mr. E. E. Utley, Executive Vice President ORB#1 Gray TChandrasbaran Power Supply and Engineering & Construction JWermiel Carolina Power and Light Company Post Office Box 1551 Raleigh, North Carolina 27602
Dear Mr. Utley:
SUBJECT:
H. B. ROBINSON STEAM ELECTRIC PLANT UNIT NO. 2 AUXILIARY FEEDWATER SYSTEM TORNADO MISSILE PROTECTION (TAC NO. 49223)
We have completed our review of your submittal dated August 29, 1983 as supplemented by letter dated May 29, 1984. Based on your submittals our consultant, the National Bureau of Standards, developed a Technical Evaluation Report (TER), "The Effects of Tornadoes on the Availability of the Auxiliary Feedwater System at H. B. Robinson Unit 2."
Our staff concurs with the findings of the TER.
We conclude that the probability of failure o the AFWS at HBR-2 due to tornado generated missiles is about 1.3 X 10- per year. This is approximately an order of magnitude higher than that repbrted in your August 29, 1983 submittal (1.8 X 10 per year).
Singe the failure probability exceeds our current guidelines of less than 10 per year we conclude that your analysis has not demonstrate a sufficiently low failure probability and therefore reanalysis or commitments must be provided as indicated below:
- 1. Probabilistic reanalysis of the AFWS including non-tornado wind speed data that was not included in the original analysis.
- 2. Commit to providing positive tornado missile protection for
_the Service Water System (SWS), which is one of the water supplies for the AFWS. The staff notes from your submittals that failure of the exposed SWS pump motors entails failure
.of the AFWS even if the condensate storage tank, another source.of water supply to the AFWS, can be demonstrated to be available in.sufficient time to transfer AFW pump bearing 8504020418 850314 PDR ADOCK 05000261
_____P PDR
Mr. E. E. Utley 2 -
March 14, 1985 cooling. Further, the SWS is a portion of the ultimate heat sink which performs an essential cooling function for the plant during normal and accident conditions.
Your response to our continuing concern is requested within 60 days from receipt of this letter. A copy of our TER is enclosed.
The.reporting and/or recordkeeping requirements of this letter affects fewer than ten respondents; therefore, OMB clearance is not required Under P.L.96-511.
Sincerely,
/s/SVarga Steven A. Varga, Chief Operating Reactors Branch #1 Division of Licensing
Enclosure:
As stated cc w/enclosure:
See next page ORB#1:
- L GRequa-P S
r 3/11/853/
5
Mr. E. E. Utley H. B. Robinson Steam Electric Carolina Power and Light Company Plant 2 cc: G. F. Trowbridge, Esquire Mr. Dayne H. Brown, Chief Shaw, Pittman, Potts and Trowbridge Radiation Protection Branch 1800 M Street, N.W.
Division of Facility Services Washington, DC 20036 Department of Human Resources P.O. Box 12200 Regional Radiation Representative Raliegh, North Carolina 27605 EPA Regiona IV 345 Courtland Street, N.E.
Atlanta, GA 30308 Mr. McCuen Morrell, Chairman Darlington County Board of Supervisors County Courthouse Darlington, South Carolina 29535 State Clearinghouse Division of Policy Development 116 West Jones Street Raleigh, North Carolina 27603 Attorney General Department of Justice Justice Building Raleigh, North Carolina 27602 U.S. Nuclear Regulatory Commission Resident Inspector's Office H. B. Robinson Steam Electric Plant Route 5, Box 413 Hartsville, South Carolina 29550 James P. O'Reilly Regional Administrator -
Region II U.S. Nuclear Regulatory Commission Suite 2900 101 Marietta Street Atlanta, GA 30303 Mr. R. Morgan General Manager H. B. Robinson Steam Electric Plant Post Office ox790 Hartsville, South Carolina 29550