ML20086U070

Proposed Tech Specs 15.4.4 VII Pages 15.4.4-8 - 15.4.4-10 Re Tendon Surveillance

ML20086U070
Person / Time
Site:	Point Beach
Issue date:	12/23/1991
From:	WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20086U063	List: ML20086U062 ML20086U070 ML20086U079 ML20086U085 ML20086U094 ML20086U095 ML20086U101 ML20086U104 ML20086U111 ML20086U117
References
NUDOCS 9201070196
Download: ML20086U070 (6)

Text

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1 PBNP TECHNICAL SPECIFICATIONS 15.4.4 VII (Pages 15.4.4-0 through 15.4.4-10) 9201070196 97.1203 PDR- ADOCi: 05000266 P FDR t

- VI. Containment Hodifications Any major modification or replacement of components of the containment performed after the initial preoperational leakage rate test shall be followed by either an integrated leakage rate test or a local leak detection test and shall meet the acceptance criteria of 1.B. and II.B.

respectively. Modifications or replacements performed directly prior to the conduct of an integrated leakage rate test shcIl not require a separate test.

VII. TENDON SURVEILLANCE A. Object f in order to insure containment structural integrity, selected tendons shall be periodically inspected for symptoms of material deterioration or lift-off force reduction. The tendons for inspection shall be randomly but representatively selected from each group for each inspec-tion; bcwever, to develop a history and te correlate the observed data, one tendon from each group shall be kept unchanced after initial selec-tion. Tendons selected for inspection will cw,3ist of five hoop tendons, three vertical tendc,s located approximately 120* apart, and three dome  ;

tendons, one from each of the three dome tendon groups.

B. frecuency Tendon surveillance shall be conducted at five year intervals in accordance with the following schedule:*

Unit Year Surveillance Required 1 1984 Physical 2 1984- Visual 1 1989 Visual 2 1989 Physical C. Inspections.

Tendon surveillance in accordance with 15.4.4.Vll.B shall consist of either a visual or physical inspection.

-(1) Visual Ir.spection

a. Tendon anchorage assembly hardware of the randomly selected tendons shall be visually examined to the extent practicable 4

• 5ubsequent five year interval inspections repeat this pattern.

k Unit 1 - Amendment No. 89 15.4.4-8 March 27, 1985 Unit 2 - Amendment No. 94

without dismantling load bearing components of the anchorage.

The immediate concrete area shall be checked visually for indications of abnormal material behavior.

(2) Physical Inspection

a. Tendons which are physically inspected shall first be visually inspected in accordance with C.(1).

b. All tendons which are physically inspected shall be subjected to a lift-off test to monitor their prestressing force.

(i) If the prestressing force of a selected tendon in a group lies above the predicted lower limit, the tendon is considered +0 be acceptable.

(ii) If the prestressing force of a selected tendon lies between the predicted lower limit and 90% of the predicted lower limit, two tendons, one on each side of the te.;

tendon, shall be checked for their prestressing forces.

If the prestressing forces for these tendons are above the predicted lower limit for the tendons, all three tendons shall be restored to the required level of integrity. A l

single deficiency shall be considered unique and nctept-able. If the prestressing f9rce of either of the adjacent tendons falls below the predicted lower limit of the tendon, additional lift-off testing should be done if necessary, so that the cause and extent of such occurrence can be determined and the condition shall be considered an ab-normal degradation of the containment structure and the provisions of Specification 15.3.6.D are applicable.

(iii) If the prestressing force of the selected test tendon falls below 90% of the predicted lower limit, the tendon shall be completely detensioned and a determination shall be made as to the cause of the condition. Such a condition shall be considered an abnormal degradation of the containment structure and the provisions of Specification 15.3.6.0 are applicable.

(iv) If the average of all measured tendon forces for each group (coriected for average condition) is found to be 15.4.4-9 March 27, 1985 Unit 1 - Amendment No. 89 Unit 2 - Amendment ho. 94

less than.the minimum required prestress level at Anchorage location for that group, the condition should be considered as abnormal degradation of the containment structure and the provisions of 15.3.6.0 are applicable. The average minimum design values adjusted for elastic losses are as follows:(6)

Hoop 134.5 ksi Vertical 140.6 ksi Dome 137.4 ksi

c. One randomly selected tendon from each group of tendons shall be subjected to complete detensioning in order to identify broken or damaged wires. During the retensioning of the detensioned tendon, simultaneuus measurements of elongation and jacking force shall be made at a minimum of two. levels of force between the required seating force and zero. During the detensioning and retensioning of the tendons tested, if the elongation corresponding to a specific load differs by more than 5% from that recorded during installation of the tendons, an investiga- '

tion shall be made to ensme that such discrepanties are not related to wire failures or slippage of wires in anchorages,

d. A tendon wire shall be removed from the one tendon from each group which has been completely detensioned.

The wire shall be inspected over its entire length to determine if evidence of corrosion or other deleterious effects are present. Tensile tests shall be made on three samples cut from each removed wire. The samples will be cut from tre midsection and each end of the removed wire, failure of the. material to demonstrate the minimum required tensile strength of 240,000 psi shall be considered an abnormal condition of the containment structure and the engir.smring evaluation provisions of Specification 15.3.6.0.1 are applicable. If an acceptable justification for continued operation cannot, be concluded from this evaluation, then the shutdown requirenents of Specification 15.3.6.D.1 are applicable.

March 27, 1985 Unit 1 - Alnendment No. 89 15.4.4-9a Unit ? - Amendment No. 94

e. The sheathing filler grease will be sampled and inspected on each physically inspected tendon, The operability of the sheathing filler grease shall L.e verified by assuring:

1) There are no voids in the filler material in excess of 5% of nct duct volume.

2) Complete grease coverage exists for the different parts of l the Anchorage system, and

3) The chemical properties of the filler material are within the tolerance limits sp t:ified by the manuf acturer.

D. Repor_ts A final report documenting the results of each tendon surveillance will be preparea and uaintained as a permar.ent plant record.

Abnormal conditions observed during testing will be evaluated to de-termine the effect of such conditions on containment structural integrity.

This evaluation should be completed within 30 days of tt,; is %i fication of the condition. Any condition which is determined in this etaluation to have a significant adverse effect on containment structural integrity will be considered an abnormal degradation of the containment structure.

Any abnornal degradation of the containment structure identified during the engineering evaluation of abnormal conditic,ns shall be reported to the Nuclear Regulatory Commission pursuant to the requirements o'i 10 CFR 50.4 within thirty days of that determination. Other conditions that indicate possible effects on the iniegrity of two or more tendons shall be reportable in the same manner. Such reports shall include a description of the tendon condition, the condition of the concrete (especially at tendon anchorages), the inspection procedure and the corrective action taken.

VIII.End Anthorace Concrete Surveillance A. Specific locations ftr surve m ance will be determined by information f obtained from design calculations, as-built end anchorage concrete and prestressing records, observations of the end anchorage concrete during and after prestressing, and results of deformation measurements made durin; prestressing and the initial structural test.

B. The inspection intervals will be approximately one-half year and one l

year af ter the initial structural test and shall be chosen such that the inspection occurs during the warmest and coldest part of the year following the initial structural test.

15.4.4-9b January 5,1987 51 FR 40303 l

C. The_ inspections made shall include:

-(1) Visual . inspection of the end anchorage concrete exterior surfaces.

.(2) A determination of the temperatures of the liner plate area or containment interior surface in locations near the end anchorage concrete under surveillance.

(3) Measurement of concrete timperatures at ',pecific end anchorage concrete surfaces being inspected.

(4) The mapping of the predominant visible concrete crack patterns.

(5) The measurement of the crack widths, by use of optical comparators or wire feeler gauges.

(6) The measurement of movements, if any, by use of Jamountatie mechanical extensometers.

D. The measurements and observations shall be compared with those to which pressressed structures have been subjected in normal and abnormal load conditions and'with those of preceding measurements and observations at the same locat:on on the reactor containment. I

a. 'E.. The acceptance criteria shall be as follows:

P'%

Ifi the inspections determitie that the conditions are f avorable in comparison with experience-and predictions, the close inspections will 7

be terminated by the last of the inspections stated in the schedule

.and a report wil.l'be prepared which documents the findings'and recommends ~the schedule for. future inspections, if any. If the

' inspections-detect symptoms of greater than normal cracking or movements, an immediri+ investigation will be.made to de' . mine the -

cause.

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