ML18228A463
| ML18228A463 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 08/18/1978 |
| From: | Robert E. Uhrig Florida Power & Light Co |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18228A463 (5) | |
Text
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS>
D1STRIBUTION FOR INCOMING MATERIAL
-25 251 REC:
SQHWENCER A
GRG:
UHRIG R E DOCDATE: 08/18/78 NRC FL PWR Ik LIGI.IT DATF RCVD: 08/22/78 DOCTYPE:
LETTER NOTARIZED:, NO COPIES RECEIVED
SUBJECT:
LTR 3 ENCL 0 R-SPONSE TO NRC LTR,DTD 08/14/78... FURNlSHING 1NFO RE CONSEQUENCES OF THE POSSIBLITY Ol= EXTRANEOUS WEI D MATERIAL BEING PRESENT IN UNIT 4 REACTOR VESSEL NOZZLE.-BELT TO SHFLL CIRCLE SCAN WELD.
PLANT NAME: TURKEY PT 83 TURKEY PT 84 REVIEWER 1NITIAL:
XJM DISTRIBUTER INITIAL:Pi DISTRIBUTION OF THIS MATERIAL I AS FOLLOWS REACTOR VESSEL MATERIAL SURVEILLANCE
<DISTRIBUTION CODE A021)
FOR ACTION:
INTERNAL:
EXTERNAL:
EG FI
+~LTR ONLY(0.)
-+4LTR ONLY(2)
MIPC><LTR ONLY< 1) k MATERIAL ENG BR+>LTR ONLY(i)
ENGINEERING BR+<LTR ONLY < 1)
PLANT SYSTEMS BR++LTR ONLY(i>
IlAZELTON44LTR ONLY< 1)
R GAMBLE++LTR ONLY(i>
LPDR $
MIAMI, FL4%LTR ONLY<1)
TERA44LTR ONLY(1>
NSIC+<LTR ONLY< 1)
ACRS CAT B>+LTR ONLY(16)
NRC PDR4+LTR ONLY<1)
GELD~4LTR ONLY(i>
HANAUER4+LTR ONLY<i)
AD FOR SYS Cc PROJ>+LTR ONLY(i)
REACTOR SAFETY BR44LTR ONLY< 1)
EEB++LTR ONLY(1)
HOGE44LTR ONLY< 1)
RANDALL<+LTR ONLY(i>
BR CHIEF ORBSi BC44LTR ONLY(3)
ZWETZIG++LTR ONLY< 1)
DISTRIBUTION:
2P
%%0f %8f%%%%%%%%% 3l %%%%%%%%%%%%%%%%%%%%
THE END CONTROL NBR:
782340173
0
~ 'I li It II II I
11 I
I I
t' i
I It II ij
plr I
tIEGULRTOPY DOCKET E
FLORIDAPOWER & LIGHTCOMPANY August 18,. j-978 L-78-274 Office of Nuclear Reactor Regulation Attention:
Mr. A. Schwencer, Chief Operating Reactors Branch Pl Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D.
C.
20555 I
E rP," I ESP E
PS E )<~
PEl
~CA 4
e:M Pl eQ LP ~
~V.g C'$<~'(a C7 C/l
Dear Mr. Schwencer:
Re:
Turkey Point Units 3 and 4 Docket Nos.
50-250 and 50-251 Reactor Vessel At ical Weld Material The following information is prov'ided.in response. to your letter of August 14, 1978:
r On August ll, 1978, Westinghouse. Electric Corporation informed Florida Power Light Company (FPL) that they were evaluating the consequences of the possibility of extraneous weld material being present in the Turkey Point Unit 4 reactor vessel nozzle-belt to shell circle seam weld.
Westinghouse reported that this material could have an estimated initial RTNDT of 125 F, but would be located in a region where fluence is a factor of approximately 6-1/2 less than the limiting core region.
Since then, Westinghouse has met with the reactor vessel manufacturer to review the potential weld metal problem.
Information was presented at the meeting to show that the extraneous weld material was not used in any Unit 3 reactor vessel welds and was not used in any Unit 4 reactor vessel welds other than possibly the nozzle-belt to shell circle seam weld.
No information was presented to prove that the extraneous weld material was not used in the sub'ject Unit 4 weld, therefore, for the purpose of evaluating the effect of radiation on that weld, it was assumed that the extraneous material was used.
- However, even with this conservative
- approach, the assumed presence of the extraneous weld material has no adverse safety consequences because the subject weld is located in a non-limiting region.
Furthermore, Westinghouse has determined that if the extraneous weld material was used in the nozzle-belt to shell circle seam weld it would be in the outside diameter of the weld.
The Unit 4 heatup and cooldown curves in the Technical Specifications are ba~ed on an RTNDT of 281 F at the 1/4 thickness location and are applicable for up'o 5 effective full power years of operation.
The assumption that extraneous weld material exists in the reactor vessel nozzle-belt to shell circle seam weld has no effect on the use of these curves because the subject i ~>>GOE73 PEOPLE...SERVING PEOPLE
0 lg
/
iJ T
C Jt r
)i
Office of Nuclear Reactor Regulation Page Two weld is located in a region where fluence is much less than in the limiting 1/4 thickness region and also because the extraneous material would be located in the outside diameter of the weld.
Based on the information presented
- above, the possible use of extraneous weld material in the Turkey Point Unit 4 reactor vessel nozzle-belt to shell circle seam weld does not require revised pressure/temperature limits.
The existing Technical Specification heatup and cooldown curves are sufficient to provide the necessary reactor vessel integrity and to ensure conti nued safe operation of the facility.
We will continue our discussions with Westinghouse in order to achieve final resolution of this issue.
Very truly yours, Robert b. Uhrig Vice President REU/HAS/GG/cpc cc:
Mr. James P. O'Reilly, Region II Robert Lowenstein, Esquire