ML17212B001
| ML17212B001 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 11/10/1981 |
| From: | FLORIDA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML17212B000 | List: |
| References | |
| NUDOCS 8111170393 | |
| Download: ML17212B001 (7) | |
Text
TABLE 4.4-2 0 tt(0 a~
el<
QO W'tD Gl Q
Cllto Qw Q~
Qw
.tsar v tstLtO.
KQI 1ST SAMPLE INSPECTION 2ND SAMPLE INSPECTION Sample Site A minimum of S Tubes per S. G.
Result C-1 C-2 Action Required None Plug defective tubes and inspect adrlitional 2S tubas in tltis S. G.
Aasti l t N/A C-1 C-2 Action Acquired N/A Nona Plug rlefactive tubes and inspect additional 4S tubes in tltis S. G.
STEAM GENERATOR TUBE INSPECTION Result Action Acquired N/A N/A N/A C-1 None N/A C-2 Plug defective tubes Perform action for C-3 result of first sainple 3AD SAMPLE INSPECTION C-'3 Inspect all tubes ip tltis S. G., plug de.
factive tubes an(l Inspect 2S tubes in eacl> other S. G.~:
Prompt notification to NAC l)ufsuant
'to sp eel lt cat 1 oil 6.9.1 C-3 All other S. G.s are C-1 Soigne S. G.s C-2 faut no alldlltonal S. G. are C-3 Ailrlitional S. G. is C-3 Parfornt action for C-3 result of first satnpla I'Iona Perform action for C-2 result of second safu))la Inspect all tubas in each S. G. and plug defective tubas.
Pronitt t notification to NAC ln(rsuant to speci llcatlon 6.9.1 N/A N/A N/A N/A N/A N/A Where N is ti>a nun~her of steam generators in tl>e unit, arel n is tl>a nuniber ol steam generators inspected during an inspection The requirement to inspect all tubes may be relaxed for Cycle 5 Refueling since an engineering evaluation has shown that the condition(s) has been adequately bounded by inspection.
~W)
SAFETY EVALUATION Re:
St.
Lucie Unit 1
Operating License DPR-67 Proposed Change to Technical Specifications Steam Generator Tube Inspection Re uirements INTRODUCTION NOTE:
During the Fall 1981 scheduled unit outage, the planned Eddy Current Testing (ECT) inspection program on Steam Generator "B" was temporarily
- delayed, so that a leaking tube(s),
detected during plant operation could be located and evaluated.
The leaking tube (L144 R10) was found by helium leak test methods, and was located in an area which is not part of our normal planned inspections.
A cluster of fifteen (15) tubes around the leaking tube was examined by ECT and two tubes were found defective (exceedi ng the 40$ plugging limit of the Tech Spec).,
These inspection results put us into a potential category C-3 classification per Table 4-4-2.
Subsequently, we increased our sample size (mi nimum of 3g) by inspecting all tubes (308) in Rows 8 through 12 and found forty (40) defective tubes.
These inspection results put us into Category C-3.
In addition to our planned outage ECT program, we increased our sampl'e size (minimum 6$ ) in the "A" Steam Generator and began inspection in Rows 8 through 12.
We found twenty-three (23) defective tubes which also put this generator into Category C-3, I
Based upon these findings in the steam generators, FPL continued with a comprehensive program in both generators, designed to completely locate and bound the area(s) of degradation.
In total, 24 defective tubes were found in S/G A and 42 defective tubes were found in S/G B.
In four previous steam generator inspections, St. Lucie 1 has not had a
recordable indication.
Additionally, steam generator denting, first detected in 1978, remains minimal.
EVALUATION The steam generator inspection results identified a
new or more probably, a'previously undetected degradation mechanism occurring in both steam generators.
Extensive examinations were performed in both generators.
Approximately 2282 tubes were inspected in S/G A and approximately 3228 were inspected in S/G B.
The examinations were continued well beyond the actual areas of degradation such that the condition was shown to be localized and conservatively bounded by the inspections.
Areas which may have been remotely suspect due to similar design considerations, were also i nspected and shown to be void of the condition.
The actual inspection program was described to the NRC staff via an oral presentation on November 9, 1981.
Tube sheet maps specifically describing the inspections and results were included in the presentation, and copies are being provided to the NRC.
Hv h
Page 2
St.
Luci e Unit 1
Operating License DPR-67 Proposed Change to Technical Specifications-Steam Generator Tube Inspection Re ui rements III.
CONCLUSION The comprehensive inspections performed in both steam generators at St.
Luci e Unit 1 demonstrated that the detected condition was indeed localized and conservatively bounded by inspection.
The inspection areas
- selected, the various types of inspections performed, and the large number, of tubes inspected, give a very high confidence level that the generators are free of any undetected tube problems.
This meets the intent of the Technical Specifications, and additional inspections would not produce useful information and would only increase inspection
- costs, nuclear unit "down time", and man-rem exposure.
Therefore, Florida Power and Light Company has concluded that this Technical Specification revision does not reduce any safety margins and presents no significant risk to the health and safety of the public.
I N
l' t
I I
j1
P STAT" OP PLORXDA
)
)
COtPi7TY OP DADE
)
E. A.Adomat being irst duly sworn, deposes and says:
Tha-he is Executive Vice President Light Company, the icensee herein;
~of Florida Power That he has executed the foregoing document; that the state-ments made in this said document are true and correct to the best of his knowledge, information, and bel'ef, and that he is authorized to execute the document, on behalf o said E. A. Adomat Sub cribed and sworn to before me this
'$0, day oc I is f/
Notary Public 'State of My Commission Expirac Bondad thru Maynard ROTAx~Y PUSLXC, in and for the County
'8~at of Florida
'I Ny commission exp" res:
of Dade, Rorida a't Largo October 30, tgg3 Bonding Agency
"I, 4
1,
~'.'y r
/,