ML20247F111
| ML20247F111 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, 05000000 |
| Issue date: | 03/23/1989 |
| From: | UNION ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20247F099 | List: |
| References | |
| NUDOCS 8904030317 | |
| Download: ML20247F111 (3) | |
Text
Attachment 1 ULNRC-1950 4
Am4 % W.dAC -d73(9hsf 35) ou. ? -l M .
Page 1 of 3 Amendment No . 6
. CONTAINMENT SYSTEMS CONTAINMENT VESSEL STRUCTURAL INTEGRITY LIMITING CONDITION FOR OPERATION 3.6.1.6 The structural integrity of the containment vessel shall be maintained at a level consistent with the acceptance criteria in Specification 4.6.1'.6.
APPLICABILITY: MODES 1, 2, 3, and 4. ** EM # M'O
& A -tL -~ ,- W _:adid*-
ACTION: 4 3.,, g, . r,, 9,y,y,4
- a. With more than one tendon with an observed ift-offforcebetween the predicted lower limit and 90% of the pre 1c e %(er limit w.
withonetendonbelow90%ofthepredictedlowerlimitVrestorNe e tendon (s) to the required level of integrity within 15 days and perform an engineering evaluation of the containment and provide a Special Report to the Commission within 30 days in accordance with Specification 6.9.2 or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
- b. i'ith :ny :bacr;;l degr:d:ti n f th; :tr::tur:1 integrity th:r th:n
^CTION :. :t a leve! bel:e th: :: cept nce criteria of Speci'ica-
. tien d.5.1.5, restere the centzi- ent verre! to the required leve!
T,.w# -ef integrity "ith4- 72 heur: :nd perfer- en engineer' g evaluatier of the centziament and provide Special Report te the C^--issier-
"ithi- 15 day: 4" ac:Ord:ne: with Sp :ificaticr E.9.2 er 5: ' n :.t
~
le::t HOT ST"0SY 'ithin the next S heur: :nd in COLO C'JT00MN with4- the felleuia; 30 heurn
. SURVEILLANCE REQUIREMENTS 4.6.1.6.1 Containment Vessel Tendons. The containment vessel tendons' struc-tural integrity shall be demonstrated at the end of 1.5, 3.5, and 5.5 years l following the initial containment vessel structural integrity test and at 5 year !
intervals thereafter. The tendons' structural integrity shall be demonstrated by:
- a. Determining that a random but representative sample of at least 11 tendons (4 inverted U and 7 hoop) each have an observed lift-off force within predicted limits for each. For each subsequent inspec-tion one tendon from each group may be kept unchanged to develop a history and to correlate the observed data. If the observed lift-off force af any one tendon in the original sample population lies between the predicted lower limit and 90% of the predicted lower limit, two tendons, one on each side of this tendon should be checked for their lift-off forces. If both of the.se ad s cent tendons are found to be within their predicted limits, all three tendons should be restored to the required level of integrity. This single deficiency may be considered uni'que and acceptable. Unless there is abnormal degradation of the containment vessel during the first three inspec-tions, the sample population for subsequent inspections shall include at least 6 tendons (3 inverted V and 3 hoop);
CALLAWAY - UNIT 1 3/4 6-8 6904030317 890323 hDR ADOCK 05000482 P D C ___ _ __ _ _ _ _ _ _ _ _ _ _ _
Attachment 1 A n.ss. f kLNM H1b(, t}tI}f f) m ehhJ- ULNRC-1950 Page 2 of 3 RE9;g10N CONTAINMENT SYSTEMS 2'-
g SURVEILLANCE REQUIREMENTS (Continued)
- b. Performing tendon detensioning, inspections, and material tests on a previously stressed tendon from each group (inverted U and hoop).
A randomly selected tendon from each group shall-be completely.
detensioned in order to identify broken or damaged wires and deter-mining that over the entire length of the removed wire that:
- 1) The tendon wires are free of corrosion, cracks, and damage,
- 2) There are no changes in the presence or physical appearance of the sheathing filler grease., and
- 3) A minimum tensile str'ength of 240,000 psi (guaranteed ultimate strength of the tendon material) exists for at least three wire samples (one from each end and orie at mid-length) cut from each removed wire. Failure of any one of the wire samples to meet the minimum tensile strength test is evidence of abnormal degradation of the containment vessel structure.
- c. Performing tendon retensioning of those tendons detensioned for inspection to their observed lift-off force with a tolerance limit of v6%. During retensioning of these tendons, the changes in load and elongation should be measured simultaneously at a minimum of three approximately equally spaced levels of force between zero and the seating force. If the elongation corresponding to a specific .
load differs by more than 5% from that recorded during installation, an investigation should be made to ensure that the difference is not related to wire failures or slip of wires in anchorages;
- d. Assuring the observed lift-off stresses adjusted to account for elastic losses exceed the average minimum design value given below:
Inverted U 139 ksi Hoop: Cylinder 147 ksi Dome 134 ksi
- e. Verifying the OPERABILITY of the sheathing filler grease by assuring:
- 1) No voids in excess of 5% of the net duct volume, T M B
- 2) Minimum grease coverage exists for the different parts of the anchorage system, and
- 3) The chemical properties of the filler material are within the tolerance limits as specified by the manufacturer.
CALLAWAY - UNIT 1 3/4 6-9
, o Attechmsnt 1 ULNRC-1950 Page 3 of 3 Areas of change from ULNRC-1173 (9/18/85) are underlined.
INSERT A
- b. With any abnormal degradation of the structural integrity at a level below the acceptance criteria of Specification 4.6.1.6.1.b or c, perform an engineering evaluation to demonstrate continued containment structural integrity and provide a Special Report to the Commission within 30 days in accordance with specification 6.9.2, or be in at least HOT SHUTDOWN within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
- c. With the structural integrity of the containment otherwise not conforming to the requirements of Specification 4.6.1.6, an investigation should be made to identify the cause of the nonconformance and to ensure the integrity of the containment has not deteriorated. A preliminary report on the investigation should be provided to the Commission within 30 days pursuant to Specification 6.9.2. A final report should be submitted to the Commission pursuant to Specification 6.9.2 within 90 days after completion of the inspection describing the tendon condition, the condition of the concrete (especially at tendon anchorages), the inspection procedures, the tolerances on cracking, and the corrective actions taken.
- d. The provisions of Specification 3.0.4 are not applicable.
INSERT B
. . . and no widespread grease leakage during visual inspection of the containment exterior. Ensure recreasing pumping pressures are maintained at or {
below a level which would minimize crease leakage through duct ioints or torn duct walls. The maximum pressure should be based on the viscosity and density l of the crease within the tendon duct.
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