ML20071J501
| ML20071J501 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/24/1983 |
| From: | Malcolm Patterson BALTIMORE GAS & ELECTRIC CO. |
| To: | Jaffe D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8305270029 | |
| Download: ML20071J501 (3) | |
Text
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g BALTIMORE GAS AND ELECTRIC a
[
CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELECTRIC ENGINEERING DEPARTMENT May 24,1983 Director of Nuclear Reactor Regulation Attention: Mr. D. H. Jaffe Operating Reactors Branch #3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Subject:
Calvert Cliffs Nuclear Power Plant Units Nos.1 & 2; Dockets Nos. 50-317 and 50-318 Containment Tendon Surveillance Technical Specifications (T.S. 3/4.6.1.6)
Gentlemen:
A marked-up copy of our proposed technical specification 3/h.6.1.6 is attached per your request.
/
Malcolm D. P[t erson Engineer MDP/pdy, i
8305270029 830524 M
PDR ADDCK 05000317 p
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CONTAINMENT SYSTEMS CONTAINMENT STRUCTURAL INTEGRITY LIMITING CONDITION FOR OPERATION The structural integrity of the containment shall be maintained at a level 3.6.1.6 consistent with the acceptance criteria in Specification 4.6.1.6.
APPLICABILITY: MODES 1,2,3, and 4 A CTION_:
With the containment structure exhibiting evidence of possible abnormal degradation per Specification 4.6.1.6.1, perform an engineering evaluation demonstrating the a.
If ability of the Containment structure to Continue to perform its d
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90 days of the surveillance test, be in COLD SHUTDOTN within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
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With the structural integrity of the containment not con'orming at a level censistent f
with the acceptance criteria of Specification 4.6.t.6.2 or 4.6.1.6.3 restore structural b.
integrity or complete an engineering evaluation that assures structural integrity prior to increasing Reactor Coolant System Temperature above 200 F.
SURVEILLAN_CE REQUIREMENTS 1
t.
The containmenk tendon's structural integrity sha!!
I' Containment Tendons.
be demonstrated at the end of one, three, and five years following the initial 4.6.1.6.1 containment structural integrity test and at five year intervals thereaf ter.
The tendon's structural integrity shall be demonstrated by:
Determining that for a representative sample of at least 21 tendons (6 dome, 3 vertical, and 10 hoop), each tendon has a normalized lift-off a.
force equalling or exceeding its lower limit expected range for the time If the normalized lift-off
- -- -,.of the--teet -(see Figuras L6-bi2,* and. -3).
force of any one tendon in a -group 'lieCbEween the lower !!mtr ' - ~
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expected range and the lower bound individual, an adjacentlendon on' If both of these tendons each side shall be checked for lif t-off force.
are found acceptable, the surveillance program may proceed considering the single deficiency as unique and acceptable. If either of the adjacent tendons is found unacceptable, at shall be considered as evidence of possible abnormal degradation of the containment structure.3 If the normalized lift-off force of any single tendon lies below the lower bound individual, the occurrence should be considered as evidence of possible abnormal degradation of the containment structure.
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A In addition, determining that the average of the normalized lif t-off forces for each sample population (hoop, vertical, dome) is equal to or greater than the required average prestress level; 536 kips for ' hoop
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tendons,622 kips for vertical tendons, and 555 kips for dome tendons (reference Figures 4.6-1, -2, and -3).
If the average is below the required average prestress force, it shall be considered as evidence of possible abnormal degradation of the containment structure.
Detensioning one tendon in each group (a dome, a vertical, and a hoop b.
tendon) from the sample population. Remo'ving one wire from each detensioned tendon and:
1.
Determining the extent of corrosion, cracks, or other damage over the entire length of the wire. The presence of abnormal corrosion, cracks or other damage shall be considered evidence of possible
- - abnormal degradation of the containment structure. _ _.
2.
A minimum tensile strength of 240 ksi for'at.least 3 wire samples (one f rom 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 sha!! be considered evidence of possible abnormal degradation of the containment structure.
Taking sheath filler grease samples and checking for changes in its c.
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physical appearanceu
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d.
Unless there is evidence of possible abnorma! degradation of the containment structure during the first three tests of tendons, the i
number of tendons checked for lif t-off force during subsequent tests i
may be reduced to a representative sample of at least 9 tendons 1
(3 dome,3 vertica!,3 hoop).
a. A. '.A.2 End Anchorages and Adiacent Concrete Surf aces. The structural integrity i
of the end anchorages and adjacent concrete surf aces shat! be demonstrated g
4 by determining through inspection that no apparent changes have occurred in the visual appearance of the end anchorage, concrete exterior surfaces or the concrete crack patterns adjacent to the end anchorages.. Inspections of j
the concrete shall be performee during )the Type A containment leakage rate.
tests- (ref erence Specification 4.6.1.2 while the containment is at its maximum test pressure.
Liner Plate. The structural integrity of the containment liner plate shall be 4.6.1.6.3 determined.during the shutdown for each Type A containment leakage rate test (ref erence Specific 5tioriY.6.f.2)"b"yT'Es'uar mspuen oi m. pMte and m 1 verifying no apparent changes in appearance or other abnormal degradation.
Any evidence of abnormal degradation of the containment R eports.
4.6.1.6.4 structure detected during the above required tests and inspections shall be reported to the Commission pursuant to T.S. 6.9.1. This report shall include description of the tendon condition, the condition of the concrete a
(especially at tendon anchorages), the inspection procedure, the tolerances on cracking, and the corrective actions taken.
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