ML20006F004

Proposed Tech Specs Re Tendon Surveillance

ML20006F004
Person / Time
Site:	South Texas
Issue date:	02/14/1990
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20006F003	List: ML20006F002 ML20006F004
References
NUDOCS 9002270068
Download: ML20006F004 (2)

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NNtK-UP OF ATTACHMENT 2 r TO THE LETTER DATED NOVEMEER 29, 1989 i

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1 9002270060 900214 i PDR ADOCK 05000498 P- PNV , ;3 7

NL.89.163.01

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1. 7 Attachment 2 i ST-HL-AE-3212  !

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6. Unless there is abnormal degradation of the containment uring the 1 first three inspections, the sample population for subsequent inspections shall include at least d'-tendons p_ hoop, cM ertical, dome,__ 5 _ inverted U). -[ p

b. Performing tendon detensioning, inspectic s, and material tests on a PO#*d <

previously stressed tendon i. enh ;; : f J.- rnd=1; eel.si.e i u;en Ip g-f ;

f r -re p*Pshall be completely detensioned in order to identify broken or damage wires and determining that over the entire length of '

the removed wire ample (which should include the broken wire if so identified) that: Q m/ ,4Q,gt,c( tug '

1. The tendon wires are f ree of corrosion, cracks, and damage, and 2.

.tc/Ci o p A minimum tensile strength of %ps i (guaranteed ultimate strength of the tendon material) exists for at least three wire samples (one f rom each end and one at mid-length) cut from each removed wire.

Tallure to meet the requirements of 4.6.1.6.1.b shall be considered as an indication t,f abnormal degradation of tho containtoent s t ruct ero ,

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c. Performing tendon retensionindof thosts tendons detensioned for inspection to at leastiforce level recorded prior to detensioning or the predicted value, whichever is greater, with the tolerance within minus

• toro to plus six percent (61), but not to exceed 70% of the guaranteed '

ultimate tensile strength of the tendons. During retensioning of these tendons, the changen in load and elongation should be measured ,

simultaneously at a minimum of three approximately equally spaced levels .

of f orce.hten :e .ud ih. . etin s h.. If the elongation 4 1 corresponding to a specific load dif fers by more than 101 f rom that recorded during the installation, an investigation should be made to

{ ensure that the dif ference is not related to wire f ailures,w elip ef-vire :.n:h;;;;;ee, This condition shall be considered as an indicatGon of abnormal degradation of the containment structure.

t. d. b Verifying the OPERABILITYmofueno the sheathing

• N rP~ws/ filler m grease f*Mwt & y assuring --

1. There are no changes in the presence or physical appearance of the 5 sheathing filler-grease including the presence __ of free water- -

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2. Amount of grease replacekdoes not exceed of the not duct volume, when injected a ." ' Of th; .p.wili:d ir.;t e.leties presswee,

3. Minisuum grease coverage exists for the dif ferent parts of the anchorage system.

O prwru Orf" to rgcccch k de5 (puA4 Spec 1C 'O 1

1 NL.89.103.01

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