ML20214P537

Proposed Tech Spec Section 3.6.1.6, Containment Structural Integrity Surveillance Requirements,Revising Number & Representative Sample of Tendons to Be Tested & Deleting Listed Tables

ML20214P537
Person / Time
Site:	Summer
Issue date:	09/16/1986
From:	SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML20214P535	List: ML20214P533 ML20214P537
References
NUDOCS 8609230219
Download: ML20214P537 (8)

Text

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I%ed 2 CONTAINMENT SYSTEMS CONTAINMENT STRUCTURAL INTEGRITY

- I LIMITING CONDITION FOR OPERATION l 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:

a. With the structural integrity of the containment not conforming to i the requirements of Specification 4.6.1.6.1.b,. perform an engineering evaluation of the containment to demonstrate the acceptability of 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 STAN0BY 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 SHUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

b. With the structural integrity of the containment otherwise not 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 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.

The structural integrity of the tendons shall be demonstrated by:

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a. Oct r ;ining th:t : =pr==tatin :dpl:* cf :t 1:=t 15 t=d:=

G Je;..e, 5 sciti=1, and 0 h=;) =ch h= ; lif t ;f' f:r= cf ;r=W p1M t.b. a e w;l t; 05% ;f it: S: = ":l = indi nted in .. .. .. _. If 4 ,

the lift off force of a 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 3-tendons are greater than or equal to 95% of their Base Values T:51: ' 5-15, the single deficiency shall be l

considered unique,and acceptable. For tendon (s) not conforming to "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-late the observed data, one tendon from each group (dome, vertical, and hoop) may be kept unchanged after the initial selection.

SUM ER - UNIT 1 3/4 6-8 8609230219 860916 PDR ADOCK 05000395 p PDR m _. _. -

I September 10, 1986 Attachment I Page 2 of 7 Containment Structural Integrity Determining that for a representative sample

• of at least 21 tendons (6 dome, 7 vertical, and 8 hoop) for the 10 year surveillance, and of at least 9 tendons (3 dome, 3 vertical, and 3 hoop) for the five year surveillance intervals thereafter, each has a lift off force greater than or equal to 95% of its Base Value.

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CONTAINMENT SYSTEMS

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SURVEILLANCE REQUIREMENTS (Continued) e 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 The , ,

minimum requir average tendon force is {gpsthe group.

for vertical tendons, M15F ps for dome tendons, and c ps for hoop tendons.

The Normalized Lift Off Force for a tendon is obtained by adding the '

Normalizing Factor appearing in Tat,le ".5-2 to the lift off force. . 4 Failure to comply with this 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 lift-off forces of tendons adjacent to the deficient tendon to

^. determine if the average of the tendon lift-off forces in this i 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. l

c. Detensioning one tendon in each group (dome, vertical and hoop) from the representative sample. One wire shall be removed from each detensioned tendon and examined to 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 l abnormal condition is indicated. I

2. A minimum tensile strength value of 240,000 psi (guaranteed ultimate strength of the tendon material) for at least three l wire samples (one from each end and one at mid-length) cut from '

each removed wire.  ;

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d. Determining for each tendon in the above reprdsentative tendon sample, l that an analysis of a sample of the sheathing' filler grease is l within the following limits: "

1. Grease Voids j 5% of net duct volume 1

2. Chlorides J 10 PPM

3. Sulphides 1 10 PPM

4. Nitrates j 10 PPM

5. Water Content 5 10% by weight SUP94ER - UNIT 1 3/4 6-9 l

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T f SQ wth CONTAINMENT SYSTEMS

]gp 4 g SURVEILLANCE REQUIREMENTS (Qontinued)

If the inspections performed at 1, 3, and 5 years indicate no abnormal degradation of the tendon system, the number of sample tendons may be reduced to 3 dome, 3 vertical, and 3 hoop for subsequent inspections. Upon the comple-tion of the five year inspection, the results of the first three inspections shall be evaluated to determine if an abnormal condition is evident for the tendon system. "e;;d :. th: cent'r:ftr 0' thf: Ord ustfr , "e : -' tr i r,.

. . . . . . , . . . , . . . . . . . . _ . . . . _ . . . _ . . _ . . . , . _ _ _ _ . _ he ;er?'f ed 9'

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4.6.1.6.2 At the same inspection frequency as the tendons, the structural integrity of the end anchorages of all tendons inspected pursuant to Specifica4 -

tion 4.6.1.6.1 and the adjacent concrete surfaces shall be determined by a visual inspection and verifying that no abnormal material or structural behavior is evident 4.6.1.6.3 At the same inspection frequency as the Type A containment leakage rate test, the structural integrity of the exposed accessible interior and exterior surface *, of the containment shall be determined prior to each Type A containment leakage rate test (Specification 4.6.1.2) by a visual inspection of these surfaces and verifying that no abnormal material or structural behavior is evident.

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l SUM 4ER - UNIT 1 3/4 6-10 w.

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Table 4.6-la. Base value of tendon force '

. SURVEILLANCE TENDONS

[

O 1NseECT10N eEat00 /

1 2

[ 3 Base value Base value Base value Tendon (kips) Tendon (kips) Tendon (kips) 0-104 1275 0-125 / 1230 0-108 1287 0-129 1245 0-21 2 0-121 1225 0-219 1265 0 5 0-213 1223 0-328 1287 1273 0-316 1284 -

V-23 1328 1319 V-23 1313 V-46 13 / 1287 V-37 1299

, V-67 1 2 53 1316 V-60 1294 V-92 V-76 1315 V-83 1314 1299% V-99 1309 V-106 1296 V-115 1322 i 3AC 1318 3AC 1309 3AC 1303 ,

8BA 126 13BA 1278 8CB 1249 13CB 3- 18CB 1259 18BA 1249 P 28CB 260 28BA 1259 28AC 1259 38AC 1250 33CB 1278 33BA 1272 38 1250 41AC 1268 38CB 1226 l

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3/4 6-10a Amendment No. 22

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- Table 4.6-lb. Base value of tendon force A0JACENT TENDONS ,'

INSPECTION PERIOD [ g 1 2

[3 Base value Base value ase value (kips) Tendon (kips) Tendo (kips)

Tendon 0-124 1284 0-1 1241 0

0-103 1245 0-105 1250 0-126 1262 0- 09 1222 D-128 1296 0-212 1300 -120 1284

, 0-130 1267 D-214 1252 0-122 1264 0-218 1296 0-227 1270 0-212 1294 0-220 1299 0-229 1235 0-214 1248 0-327 1244 0-323 1256 0-315 1266 l

0-329 1237 D-325 1227 0-317 1233 l

V-22 1306 V-22 130 V-22 1295 V-24 1320 V-24 1 7 V-24 1313 l-V-45 1308 V-29 01 V-36 1284 l .

V-47 V-66 1322 W- 1327 1316 V-38 V-59 1293 1308 &

> 1309 Sr52' W V-68 1309 1298 V-61 1309

'I V-82 1297 V-91 V-93 1309 1327 /NQ7 1304 1313 V-84 V-105 1311 1297 V-114 V-1 1

1 Q -98V-100 1280 1300 V-107 1307 2AC 1272\ 2AC 1265 2AC 1260 4AC 1255 4AC 1248 4AC 1242 7BA 1318 12BA 1262 7CB 1298 9BA 1286 14BA 1259 9CB 1275 l 12CB 12 17CB 1268 17BA 1256 14CB 6 19CB 1282 19BA 1284 27CB 273 27BA 1285 27AC 1291 29CB 1276 29BA 1268 29AC 1250 37AC 39A 1278 1290 32CB 34CB 1256 1229 32BA 34BA 1253 1249 37 A 1289 40AC 1272 37CB 1272 BA 1266 42AC 1251 39CB 1286 O

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3/4 6-10b Amendment No.22

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Table 4.6-2.

w n41 Normalizing factors (N.F.)

INSPECTION PERIOD

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N.F.

N.Fj ) [ N.F.

Tendon (kips) Tendon gs /Tdon (kips) 0-104 -24 0-1 36 0-108 -42 0 0-129 0-219 33 10 0-0 N6 -

0-121 0-213 40 46 0-328 -21 0- -12 0-316 -31 V-23 -15  % V-y -15 V-23 -15 V-46 11 V3 31 V-37 -5 -, '

V-67 -2 3 -24 V-60 11

-76 -11 V-83 -15 V-92 7 5.0 -

V-115 3AC g 56 V-99 3AC 5

-56 V-106 3AC 7

-56 8BA 13BA -26 8CB 26 13CB -23 18CB 29 188A 34 28CB 26 28BA 17 28AC 10 38 40 33CB -17 33BA -16 A 40 41AC 0 38CB 54 l O

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O SUMER - UNIT 1 3/4 6-10c Amendment No. 22

ATTACHMENT ll

. NO SIGNIFICANT HAZARDS DETERMINATION Based on the following evaluation, SCE&G has determined the proposed change does not involve a significant hazards consideration.

1. Does the proposed change involve a significant increase in the probability or consequences of an accident previously evaluated? NO The proposed change involves a revision to the testing program for the Reactor Containment Post-tensioning system. It does not change any of the hardware on this tendon system. It specifies the testing program to be used in the future for containment tendons. The Acceptance Criteria for the tendon forces has been revised. However, this acceptance criteria has been verified to enable the containment tendons to perform their design basis function under all postulated loads and loading conditions.

2. Does the proposed change create the possibility of a new or different kind of accident from any accident previous evaluated? NO The proposed change provides for a continued testing pro,g ram for tendons that will adequately ensure containment integrity. It wiu not create the possibility of a different kind of accident.

3. Does the proposed change involve a significant reduction in a margin of safety? NO The proposed testing program will continue to provide assurance of the integnty of the containment post tensioning system and will provide for warnm,g and appropriate actions if abnormal degradation should develop.

The mmimum average tendon force values have been reduced due to i

conservatism in the onginal values. However, the reduced values have been verified to enable the containment to meet all postulated loads and loading combinations as required to maintain safety. Therefore, the margin has been t

lowered to eliminate conservatism, but not so as to affect plant safety.

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