ML20039G616
| ML20039G616 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 01/08/1982 |
| From: | BALTIMORE GAS & ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20039G614 | List: |
| References | |
| NUDOCS 8201180501 | |
| Download: ML20039G616 (7) | |
Text
{{#Wiki_filter:e .i , 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. t APPLICABILITY: MODES 1, 2, 3, and 4 ACTION:
- a. With the structural integrity of the containment not conforming at a level consistent with acceptance criteria of Specification 4.6.1.6.1.a. complete an evaluation that assures structural integrity within 30 days or be in at least HOT STANDBY within the next 6 hours and. in COLD SHUTDOWN within the following 30 hours.
- b. With the structural integrity of the containment not conforming at a level consistent with the acceptance criteria of Specification 4.6.1.6.2 and 4.6.1.6.3 complete an evaluation that assures structural integrity prior to increasing Reactor Coolant System Temperature above 2000F.
SURVEILLANCE HEQUIREMENTS 4.6.1.6.1 Containment Tendons. The containment tendon's structural integrity shall be demonstrated at the end of one, three, and five years fol-lowing the initial containment structural integrity test and at five year intervals there af ter. The tendon's structural integrity shall be demonstrated by: 3/4 6-3 8201180501 820108 PDR ADOCK 05000317 P PDR
- a. Determining that for a representative sample of at 1 cast 21 tendons (6 dome, 5 vertical, and 10 hoop), each tendon has a normalized lif t-off force equalling or exceeding its lower limit predicted for the time of the test (see Figures 4.6-1, -2, and -3). If the normalized lif t-off force of any one tendon in a group lies between the predicted lower limit and the lower bound, an adjacent tendon oa cach side shall be checked for lift-off force. If both of these tendons are found acceptable, the sur-veillance program may proceed considering the singic deficiency as unique and acceptable. If the prestressing force of either of the adjacent ten-dons lies below the predicted lower limit, the condition is reportable per T.S. 6.9.1.
, If the lift-off force of any tendon lies below the established lower bound, the tendon shall be considered a defcetive tendon. It shall be completely detensioned and a determination made as to the cause of the occurrence. The condition is reportable per T.S. 6.9.1. In addition, determining that the means of the normalized lift-off forces for the sample populations (hoop, vertical, dome) are equal to or greater t than the required prestress levels; 536 kips for hoop tendons, 622 kips for vertical tendons, and 555 kips for dame tendons (reference figures
- 4. 6-1, -2, and -3). If the mean is below the required average prestress force, it shall be reported to Ute Commission pursuant to T.S. 6.9.1 and an evaluation shall be made to de termine probable cause and, if r2 quired, !
corrective action. Operation of the plant may continue, while the evalua-tion is being made. 3/4 6- 8a i
Unless there is evidence of possible abnormal degradatiori of the ecr.tain-ment struc ture during the first three tes ts of tendons, t.he nun.be r of ten-dons checi.ed for lif t-ot f force during subsequent tests cay be reduce.1 to a representatise sample of at least 9 tendons (3 done, 3 vertical, J !.oop) .
- b. Detensioning one tendon in each group (a dome, a vertical, and a hoop ten-dua) from the sample population. Rccoving one wire frca encu detenrioned tenLn a.id de termining:
- 1. Ta.; exter t of corrosion, crachs, or other danage over the ertire 1er.ath of the wire.
. /s rinimu, tensile strength of 240 hui for at least 3 wire s.n. pica (ene fren each er.d and one at mid length) cut from each recoved w;: a.
v rettn-io:t,.', u. t ..x.i;a t it - ,a. . .m m thin plus or atnas ttve I i:wh ,..f ' hat : ; corded .it .aa- s ress.".r. of '.nc tenuun. If the five
' ch int t is n t . .e t , .n ure:i ti ;a t ior .nal b. r.ade to dete: sine .:
;I m er fa: lure i:, -ne c au :,t .
- c. Taking nheath filler f,rease ramples ar.d checking for changes in itt physi-cal appearance.
4.6.1.6.2 End
- r chora tes and Ad jacen'. Cvicrete Surfacer..
The structural inte--
.;rity of the end anchorages and adjacent concrete surfacen shall '.e deronstrated by deter =ining through inspection tha*. no apparent chcngen have occurred in tne vi ual appearance of the end unchorage,
., . rete a:terior suz f acea ur the co;.cre te crack pa t teina ad jar ent to the en i anc:vJ ragei,. In spec t ion , of te.e concrete st.all be p.;r-
+ ormed during the Ty,ce A containme..t lea.(age l ate ter t r ( re t'e re n ce apa; ci fic a '.i c n 4. o . l . .; ) unile L n *. ev n t a in.r.c a t .a at i t.- .r.a x i mu.a te r, t preasure.
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v.,~ 4.6.1.6.3 Liner Plate. The structural integrity of the containcent liner plate shall be determined during tre snutdwa for caen Type A cun-tainment Icakage rate te s t (re t'erence Specif ica tion 1,6.1. 2 ) by a visual inspection of the plate and .erttying no apparent changes
~
in appearance or sther abnormal degradation. 4.6.1.6.4 I;c our ts. Any abnormal degradaticn of the containment structure detected during the above required tasts and inspection:; . hall be reported te the Commiscion pursuant to T.S. 6.9.J. This report shall include a deccription of the tendon conditiva, the cu.Jition of the concrete (enpecially at tenden anchoragen), the mspection procedure, the tolcrances or cracking, and the corrective actions taken. 4 3/4 6->a i i
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