ML20006F004
| ML20006F004 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 02/14/1990 |
| From: | HOUSTON LIGHTING & POWER CO. |
| To: | |
| Shared Package | |
| ML20006F003 | List: |
| References | |
| NUDOCS 9002270068 | |
| Download: ML20006F004 (2) | |
Text
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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
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NL.89.163.01
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ST-HL-AE-3212 Page 3 of 4 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,__
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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 I g-f ;
p 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:
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The tendon wires are f ree of corrosion, cracks, and damage, and
.tc/C o p i (guaranteed ultimate strength i
2.
A minimum tensile strength of %ps 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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t Performing tendon retensionindof thosts tendons detensioned for c.
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
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If the elongation 4
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corresponding to a specific load dif fers by more than 101 f rom that recorded during the installation, an investigation should be made to
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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.
Verifying the OPERABILITY of the sheathing filler grease & y assuring --
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There are no changes in the presence or physical appearance of the g
l sheathing filler-grease including the presence __ of free water-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
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1 NL.89.103.01
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