ML20138E187

Proposed Changes to Tech Spec Section 3/4.6.1.6 Re Containment Structural Integrity

ML20138E187
Person / Time
Site:	Wolf Creek
Issue date:	12/06/1985
From:	KANSAS GAS & ELECTRIC CO.
To:
Shared Package
ML20138E183	List: ML20138E178 ML20138E187
References
NUDOCS 8512130365
Download: ML20138E187 (3)

Text

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. Mr. H.R. Denton Attachment IV to KMLNRC 85-264 Page 1 of 3

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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.

ACTION:

a. With more than one tendon with an observed lift-off force between the predicted lower limit and 90% of the predicted lower limit or with one tendon below 90% of the predicted lower limit, restore the 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. "ith any ;bn; mal d;;cedetien of the structurel integrity other then

, ACTION e. et e level belew the ecceptence c iterie of Specifice' <

+ INSE"I a

" ^^ ' 5 2 5 r :t = th; " " '"'" " "i i " t " * "" ' ' " ;

Of 'nt:grity withi- 72 h:= :nd perf;= :n engin cring evchetien l ef th cent; b;;nt :nd pr; vide a Spe; ki a: pert t; th: Ceeah;ien A with'n 15 d;y; b ;;;;rdance with Specific;tien 0.0.2 er be k at

' he:t "0! OTAN00Y within the nemt 0 heurs end in COLO 0ll"T00W within the fell; wing 30 he.re.

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, 3, and 5 years following the initial containment vessel structural integrity test and at 5 year intervals 2

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 lif t-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 of any one tendon in the original sample population lies i

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 these adjacent 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 conside, red unique and acceptable. Unless there is abnormal t, degradation of the containment vessel during the first three inspec-tions,'the sample population for subsequent inspections shall include i at least 6 tendons (3 inverted U and 3 hoop);

WOLF CREEK - UNIT 1 3/4 6-8 8512130365 051206 PDR ADOCK 05000482 P PDR

. Mr. H.R. Denton Attachment IV to KMLNRC 85-264 Page 2 of 3 CONTAINMENT SYSTEMS i

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 deten-sioned in order to identify broken or damaged wires and determining 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 I 3) A minimum tensile strength of 240,000 psi (guaranteed ultimate strength of the tendon material) exists for at least three wire samples (one from each end and one 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 +6%. 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 irvestigation 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:

i Inverted U 139 ksi Hoop: Cylinder 147 ksi Dome 134 ksi

e. Verifying the OPERABILITY of the sheathing filler grease by assuring:

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1) k.~ ".b. .'.f.**. $..-s

. F**8'd.

• M. 41,

".t.4...I'""!

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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.

a WOLF CREEK - UNIT 1 3/4 6-9

c, Mr. H.R. Denton Attachment IV to KMLNRC 85-264 Page 3 of 3 INSERP A 4

b. With any apparent abnormal degradation to a level below the acceptance criteria of Specification 4.6.1.6.1.b, .c, or .d, perform an engineering evaluation to denonstrate continued containment structural integrity and provide a special Report to the Comission within 30 days in accordance with Specification 6.9.2, or be in at least HOT SHUIDOWN 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 COID SHUIDOWN 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, prepare and submit a Special Report to the Comission pursuant to Specification 6.9.2 within 90 days after coupletion 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.

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