ML17309A881
| ML17309A881 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 04/04/1997 |
| From: | Wiens L NRC (Affiliation Not Assigned) |
| To: | Plunkett T FLORIDA POWER & LIGHT CO. |
| References | |
| TAC-M97471, NUDOCS 9704140001 | |
| Download: ML17309A881 (6) | |
Text
April 4, 1997
'r.
Thomas F. Plunkett President, Nuclear Division Florida Power and Light Company Post Office Box 14000 Juno
- Beach, Florida 33408-0420 CA ~+
7/S
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION SMALL BREAK LOSS OF COOLANT ACCIDENT ST.
LUCIE, UNIT 1 (TAC NO. H97471)
Dear Hr. Plunkett:
By letter dated December 20, 1996, Florida Power and Light Company submitted a
proposed license amendment concerning reactor core safety limit for St.
Lucie Unit 1.
The NRC staff has identified additional information'hich is needed to complete its assessment of this proposed amendment.
The specific question is listed on the enclosed Request for Additional Information (RAI)'.
If you have questions concerning this issue, please contact me at (301) 415-1495.
Sincerely, Docket No. 50-335
Enclosure:
RAI cc w/enclosure:
See next page DISTRIBUTION Docket FIle, PUBLIC St.
Lucie Rdg.
S.
- Johnson, RII Original signed by Leonard A. Miens, Senior Project Manager Project Directorate II-3 Division of Reactor Projects-I/II Office of Nuclear Reactor Regulation mc~ c~HIIIIcsPw DOCUMENT NAME:
G: )STLUCIEXSBLOCA.RAI To receive a copy of this docuaent, indicate in the boxt "C" = Copy without attachment/enclosure "E" = Copy with attachment/enclosure aN" -"No co y OFFICE DATE PDII-3/PM LWiens 04/ 4 /9
~ PDII-3/LA BClayton 04/
/97 PD I I-3/D FHebdon 04/
/9T OFFICIAL RECORD COPY
rl I
II
RE UEST FOR ADDITIONAL INFORMATION ST. LUCIE'POSED LICENSE AMENDMENT OF 12 20 97 Please address the concerns, as described below, associated with reactor coolant pump loop-seal clearing and break orientation, and compliance with the requirements of 10 CFR 50.46 (b), including concerns regarding metal/water reaction, and long term cooling.
The attached non-proprietary submittal by Framatome Technologies Incorporated (FTI) provides additional information to 'describe the concern and associated phenomena.
The small break loss of coolant accident (SBLOCA) scenario involving the principal safety concern entails long term cooling conditions in which the break size and orientation would be such that the primary system would not.depressurize, limiting the emergency core cooling system injection flow rate to that only capable of matching the core boiloff rate due to decay heat.
Also, in this scenario, a column of water in the reactor coolant system pump suction loop seal would inhibit the vent path to the break and exert enough additional pressure to the steam space above the core such that the level in the core would be depressed below the top of the core.
Should this condition exist as an equilibrium condition, core uncovery would be indefinite, since the attendant decay heat rate would be small and virtually constant.
Under these circumstances the cladding oxidation criteria of 10 CFR 50.46 could be violated.
To address this concern, in the near term the licensee should provide information to assure that St.
Lucie plant, in its present configuration (including plant design, technical specifications, procedures, analyses),
will operate such that the criteria of 10 CFR 50.46 will not be violated for its SBLOCA analyses in consideration of the scenario(s) of concern.
To address longer term concerns associated with this SBLOCA
- scenario, and the capability to quantify the scenario of concern for ongoing operation and future configurations, the licensee should describe its action plan to update its licensing basis SBLOCA model with noding and correlations to explicitly simulate the phenomena for the scenario and plant configurations of concern as required by 10 CFR 50.46.
Attachment:
FTI Submittal, 7/15/96 ENCLOSURE ggG t ()9<0<)
1~J'
. Hr..T.. F. Plunkett
~
~
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Florida Power and Light Company ST.
LUCIE PLANT CC:
Senior Resident Inspector St. Lucie Plant U.S. Nuclear Regulatory Commission 7585 S.
Hwy AlA Jensen
- Beach, Florida 34957 Joe Myers, Director Division of Emergency.Preparedness Department of Community Affairs 2740 Centerview Drive Tallahassee, Florida 32399-2100 H. S.
- Ross, Attorney Florida Power
& Light P.O.
Box 14000.
Juno
- Beach, FL 33408-0420 John T. Butler, Esquire
- Steel, Hector and Davis 4000 Southeast Financial Center Hiami, Florida 33131-2398 Mr. Thomas R.L. Kindred County Administrator St. Lucie County 2300 Virginia Avenue Fort Pierce, Florida 34982 Hr. Bill Passetti Office of Radiation Control Department of Health and Rehabilitative Services 1317 Winewood Blvd.
Tallahassee, Florida 32399-0700 Regional Administrator Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, NW. Suite 2900 Atlanta, Georgia 30323 H. N. Paduano, Manager Licensing
& Special Programs Florida Power and Light Company P.O.
Box 14000 Juno
- Beach, Florida 33408-0420 J.
A. Stall, Site Vice President St. Lucie Nuclear Plant 6351 South Ocean Drive Jensen
- Beach, Florida 34957 Hr. J; Scarola Plant General Manager St.
Lucie Nuclear Plant 6351 South Ocean Drive Jensen
- Beach, Florida 34957 Hr. Kerry Landis U.S. Nuclear Regulatory Commission 101 Marietta Street, NW. Suite 2900 Atlanta, Georgia 30323-0199
'. J.
Weinkam Licensing Manager St. Lucie Nuclear Plant 6351 South Ocean Drive Jensen
- Beach, Florida 34957
4