ML17338A513
| ML17338A513 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 03/01/1979 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| L-79-50, NUDOCS 7903060442 | |
| Download: ML17338A513 (4) | |
Text
REGULATORY
)FORMATION DISTRIBUTION S EM (RIDS)
ACCESSION
'3060042 DOG ~ DATE: 79/03/01 NOTARIZED:
NO DOCKET FACIL:5 RKEY POINT PLANT UNIT 3 FLORIDA POWER AND LIGHT C
05000250 251 TURKEY POINT PLANTi UNIT 4p FLORIDA POWER AND LIGHT C
05000251 AUTH'AME AUTHOR AFFILIATION UHRIGg R ~ E ~
FLORIDA POWER 8
LIGHT CO ~
REC IP ~ NAME REC IP IENT AFFILIATION SCHWENCERIA>>
~
OPERATING REACTORS BRANCH 1
SUBJECT:
RESPONDS TO 790109 REQUEST FOR ADDL INFO RE GENERIC INFO ON BECHTEL DESIGNED CONTAINMENTS 5 BECHTEL RECOMMENDATION FOR SEALING COVERS'ISTRIBUTION CODE:
A001S COPIES RECEIVED:LTR ENCL ~
SIZE:
3 ~; i5 TITLE: GENERAL DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LIC NOTES:
RECIPIENT COPIES ID CODE/NAME LTTR ENCL ACTION:
05 BC g
~)
7 7
INTERNAL: 01 REG FILE 1
1 12 IE 2
2 15 CORE PERF BR 1
1 17 ENGR BR 1
1 19 PLANT SYS BR 1
1 21 EFLT TRT SYS 1
RECIPIENT ID CODE/NAME 02 NRC PDR 14 TA/EDO 16 AD SYS/PROJ 18 REAC SFTY BR 20 EEB 22 BR INKMAN COPIES LTTR ENCL EXTERNAL: 03 LPDR 23 ACRS 1
1 16 16 04 NSIC Wa
>19~~.
4 Jf
<<.'.a"(
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 38 ENCL 38
P.O. BOX 529100, MIAMI,FL 33152 yy) Ib~
g'ie r4 FLORIDA POWER 8 LIGHTCOMPANY March 1, 1979 L-79-50 Office of Nuclear Reactor Regulation Attention:
Mr. A. Schwencer, Chief Operating Reactors Branch k'1 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D.
C.
20555
Dear Mr. Schwencer:
Re:
Turkey Point Units 3 8
4 Docket Nos.
50-250 8 50-251 Tendon Surveillance We have reviewed your January 9,
1979 request for additional information and our response is attached.
Very truly yours, Robert E. Uhrig Vice President Advanced Systems and Technology REU/MAS/cpc Attachment cc:
Mr. James P. O'Reilly, Region II Robert Lowenstein, Esquire (I lr IIA/
veoso6O40u I.I, PEoPLE... sERYING PEOPLE
ATTACHMENT Re:
Turkey Point Units 3
8 4
Docket Nos.
50-250 8 50-251 Tendon Surveillance uestion 1
Units 3
8 4 Many generic information requests, also valid for the subject facilities, have been issued on Bechtel designed containments (e.g.,
on Arkansas Nuclear One - Unit 81 and Calvert Cliffs Unit k'1),.
These requests'have been forwarded to the respective licensees,- are therefore available to Bechtel, and need not be repeated here.
They may be grouped as follows:
'asic Unit for tendon surveillance is the whole tendon and not the individual wire.
'tudy of miscellaneous tolerances.
'echnique of the lift-offtest and study of errors-probable and mean.
Technique of wire removal and danger of damaging the wire.
Evaluation of prestressing
- losses, and normalizing factors.
Bechtel's criteria for tendon surveillance.
Provide responses to the earlier requests either by a discussion, a study with definite conclusions, or express your agreement with our statements as contained in those requests.
Res onse 1
The question refers to "generic" information requests regarding contain-ment design.
Through our Architect-Engineer, we have received responses to two of these requests (Docket Nos.
50-313 and 50-317),
- however, we have been unable to determine how the requests can be characterized as generic, or how they can be readily adapted to the Turkey Point dockets.
The NRC questions refer to statements made in other plant specific submittals, which appear to be quite different from the Turkey Point "Containment Structure Post-Tensioning System Fifth Year Surveillance Reports".
Clarification of question 1 is requested.
uestion 2 (Unit 3 In regard to the Bechtel recormendation of sealing the covers (paragraph 2.1 page 2):
a.
Explain the sealing method which will be used to make the pocket covers water tight and present the quality control procedure of this operations b.
Explain the method by which the present water will be removed and indicate the procedure which will be followed to check whether all the water has effectively been removed.
c.
Explain the procedure which will be followed to check for new condensed water which might be collected in the future (by penetrating through
- vents, cracks or other water paths).
What provisions will be made to absorb such future condensed water?
Res onse 2
a.
Plant Change/Modifications (PC/M's 79-15 and 79-16) have been prepared and approved for sealing the pocket covers protecting the vertical surveillance tendons on the containments of both Turkey Point Units 3
and 4.
The six covers will be sealed water tight by (1) installation of a wider gasket at the mating surface between the pocket cover and its
- support, (2) installation of eight additional bolts to secure the cover and replacing the six existing machine screws (which secure each cover) with bolts, and (3) sealing around the edge of the cover and bolts with a caulking compound.
The work will be performed in accordance with a Construction Work Process sheet with guality Control points to verify that standing water has been removed and that the sealing method is implemented as described above.
b.
Any standing water will be pumped out and the pocket will be dried with an absorbent material prior to reinstalling the pocket cover.
A guality Control holdpoint during the repair will require visual verification that any standing water has been removed.
c.
Water would have to leak around the pocket cover in order to enter the vertical pocket.
The sealing method described in Response 2.a is intended to preclude such leakage.
The vertical tendons are scheduled to be inspected again in 1982.