ML20246L476
| ML20246L476 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 07/12/1989 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20246L481 | List: |
| References | |
| NUDOCS 8907180445 | |
| Download: ML20246L476 (3) | |
Text
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ATTACHMENT TO CORRECTION LETTER FOR AMENDMENTS 76 AND 77 TO FACILITY OPERATING LICENSE NO. NPF-12 VIRGIL C. SUPNER NUCLEAR STATION.
DOCKET NO. 50-395 Replacethefollowingpagesofthe[ppendix"A"TechnicalSpecificationswith the enclosed pages. The revised pages are identified by amendment number and contain vertical lines indicating the areas of change. Corresponding overleaf pages are also provided to maintain document completeness.
Remove Pages Insert Pages 3/4 6-8 3/4 6-8 3/4 6-9 3/4 6-9 3/4 8-1 3/4 8-1
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a CONTAINMENT SYSTEMS CONTAINMENT STRUCTURAL INTEGRITY LIMITING CONDITION FOR OPERATION 3.6.1.6 The structural integrity of the containment 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:
l With the structural integrity of the containment not conforming to a.
the requirements of Specification 4.6.1.6.1.b, perform an engineering evaluation of the containment to demonstrate the acceptability of
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containment tendons within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />; otherwise, be in at least HOT l
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 1
following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
a.
b.
With the structural integrity of the containment otherwise not I
conforming to the requirements of Specification 4.6.1.6, in lieu of any other report required by Specification 6.9.1, prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within 30 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.
SURVEILLANCE REQUIREMENTS
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4.6.1.6.1 The structural integrity of the containment tendons shall be demonstrated at the end of one, three and five years following the initial containment structural integrity test and at five year intervals thereafter.
l The structural integrity of the tendons shall be demonstrated by:
i a.
Determining that a representative sample
- of at least 15 tendons (4 dome, 5 vertical, and 6 hoop) each has a lift off force of greater than or equal to 95% of its Base Value.
If the lift off force of a l
l selected tendon in a group lies between the 95% Base Value and 90% of the Base Value, one tendon on each side of this tendon shall be checked for its lift off force.
If the lift off forces of the adjacent tendons are greater than or equal to 95% of their Base Values, the single l
deficiency shall be considered unique and acceptable.
For tendon (s)
- For each inspection, the tendons shall be selected on a random but representative basis so that the sample group will change somewhat for each inspection; however, to develop a history of tendon performance and to corre-
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late the observed data, one tendon from each group (doine, vertical, and hoop) may be kept unchanged after the initial selection.
I SUMMER - UNIT 1 3/4 6-8 AMENDMENT NO. 76
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l CONTAINMENT SYSTEMS r
SURVEILLANCE REQUIREMENTS (Continued) not conforming to these requirements, a determination shall be made as to the cause of the occurrence and the tendon (s) shall be restored to the required level of integrity.
If the lift-off force of'the selected tendon lies below 90% of its Base Value, the tendon shall be completely detensioned and a determination made as to the cause of the occurrence, b.
Determining that the average of the Normalized Lift Off Forces for each tendon group (vertical, dome and hoop) is greater than or equal to the minimum required average tendon force for the group.
The minimum required average tendon force is 1160 kips for vertical tendons, 1063 kips for dome tendons, and 1000 kips for hoop' tendons.
The Normalized Lift Off Force for a tendon is obtained by adding the Normalizing Factor to the lift off force.
Failure to comply with this l
requirement may be evidence of abnormal degradation of the containment structure.
If the Normalized Lift-Off Force of any tendon is less than the applicable minimum required average tendon force, an investigation shall be conducted to determine the cause and extent of occurrence.
This investigation shall include as a minimum the measurement of lif t-off forces of tendons adjacent to the deficient tendon to determine if the average of the tendon lift-off forces in this region of the containment is equal to or greater than the minimum required average tendon force.' Failure to comply with this requirement may be' evidence of abnormal degradation of the containment structure.
Detensioning one tendon in each group (dome, vertical and hoop) from c.
the representative sample.
One wire shall be removed from each detensioned tendon and examined ta determine:
1.
That over the entire length of the tendon wire, the' wire has not undergone corrosion, cracks or damage to the extent that an abnormal condition is indicated.
2.
A minimum tensile strength value of 240,000 psi (guaranteed ultimate strength of the tendon material) for at least three wire samples (one from each end and one at mid-length) cut from each removed wire.
d.
Determining for each tendon in the above representative tendon sample, that an analysis of a sample of the sheathing filler grease is within the following limits:
1.
Grease Voids 1 5% of net duct volume 2.
Sulphides 1 10 PPM 4.
Nitrates
_ 10 PPM 5.
Water Content i 10% by weight SUMMER - UNIT 1 3/4 6-9 Amendment No. 76 i
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