ML20049K028

Forwards marked-up Tech Specs Re Containment Structural Integrity,Per NRC 820308 Request.Also Forwards marked-up Pages of FSAR Tech Specs

ML20049K028
Person / Time
Site:	LaSalle
Issue date:	03/25/1982
From:	Schroeder C COMMONWEALTH EDISON CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8203290331
Download: ML20049K028 (9)

Text

4 N Commonwealth Edison

) one First Nitionii Ptra. Chiciqo, lilano's a

gj} Addrzss R ply to: Post Othes Box 707 O

Chicago. Illinois 60690 Ma rch 25, 1982 98 ts RECEIVED Mr. A. Schwencer, Chie f 3

Licensing Branch #2 Division o f Licensing MAR 2 61982*

U. S. Nuclear Regulatory Commission

{ u mm mmm em 4 80m nwam u Washington, DC 20555 g

N C'

Subject:

LaSalle County Station Units 1 and 2 Technical Specification on. Tendon Surveillance NRC Docket Nos. 50-373 and 50-374 Re ference (a):

C.

W. Schroeder letter to A. Schwencer dated March 8, 1982.

Dear Mr. Schwencer:

The purpose of this letter is to provide you with a marked up copy o f the San Onofre Technical Specification on Containment Structural Integrity with LaSalle County Station data.

This infor-mation was specifically requested in a telecon between Commonwealth Edison representatives and Dr.

A.

Bournia, et al, o f your sta f f on March 8, 1982.

Also enclosed are marked up pages o f the LaSalle FSAR Technical Specification, which Commonwealth Edison feels adequately addresses this topic.

This transmittal supplements the information provided to you in Reference (a).

If there are any further questions in this matter, please contact this office.

Very truly yours, C D A ri -,t sis, C. W. Schroeder Nuclear Licensing Administrator 1m 1

Enclosure 01 (I

1 cc:

NRC Resident Inspector - LSCS 3730N 8203290331 B20325 PDR ADOCK 05000373 A

PDR

l, CONTAI!.NENT SYSTFMS

f. hggttf CONTAIRIENT STRl'CTURAL INTEGRITY 14 LIMITING CONDITION TOR OFFRATION Mn pwwi tI 3.6.1.

The structural integrity of theAcontainment shall be maintained 4

at a Icvel consistent with the acceptance criteria in Specification 4.6.1.

- o Q t/. G..f. C.2. -

%L APPLICABILI'IY: ?&ttMD1, 24 3 :pnF-4 5 4

CostOshon s o

ACTION:

k'ith the structural integrity of the containment not conforming to the above L

requ i rer.:en t s, perform an engineering evaluation or the containment to demonstrate its structural integrity 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.N5//nfh0WA/

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 following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

d

.a SURVEILLANCE REQUIREMENTS 4

Ealdi oh g

4.6.1..gontainent Tendons % containment #sEtructuralintegrityjshallbe u

g demonstrated at the end of one, three and five years after the initial structural J

{

integrity test (ISIT) and every five years thereafter.ufth the.

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b tm? c a ' i f t of f-foret--and-umkm-44t+w+mung - =! - ' t e r i ^ 1 -- t e: n W f e '-

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wM c aahall-beleterminad e t t he-end-of+onmfive-a nd-ter ren c G11 ~ d -,

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-131T o.id - y h _jena then uf ter-in r ccc rdencc with--Tabir '. 5 17-- The structural integrity shall be demonstrated by:

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- Determining that g g Q m

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tendonsgele ;cd -inzacyordg= minimum values listed jY with Tabic ' 5 1 -

j a.

I "TO have a lif t of f force bwSA 6

f

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in Tabic 4.6-2 at the first year inspection.

For subsequent inspcc-Jgy i

.)L tionsg f-: -+ndonwand=poriodicitie+-per-Table-4v6-Ir--th: - c=

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q 41 rat-- year-Mf t of f-forces: shall-be-decreased-by-the-amount-X1-Ice - t 'e

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-Mpe-4er-U-- t c. du e and -Y1 log t aips far-heetM mm-andothe ainimum.

lif t of f forces shall be decreased by the amount XX log g!nter'valiory l

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'$D tendons and Y2 1cq t for hoop tendons where t is the time

+

8 in years from initial te oning of the tendon to the current testing j+

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dategand the values X1,

,! a ' Thare in accordance with the

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values listed in Table 4.6-2 for the surveillance tendo g This test

+h shall include essentially a complete detensioning of t cur sele ted

.d.)

Jn-accordance-wFth-Tob-le L.6+1n-which-the-tendon-is-detensio _ _

.o H3 determine if any wires or strands are brokcn or damaged. Tendonak L

O found acceptab!c during this test shall be retensioned to their 3

M.2 (

observed lift off force, + 3%.

During retensioning of these tendons,

"* 9 the change in load and clongation shall be acasured simultaneouslyi j

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m., 4, q g ; ;, a i; 7 2, -;eyeir og fc; betum thwat4;

" -+ If elongation correspondin; to a specific load differs by nore than 5% from that recorded durin; installation of tendons, an investigation should be made to ensure a

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SAN-4NOFRE-UNI 4 3/4 6-f

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COA ['AIhM[.'T SYSTCiS Y96 ASUEVEILI.ANCC REGUIRD:ENTS (Continued)

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that such difference is not related to wire failures or slip of 3

e wires in anchorages.

If the lift off force of any one tendon in the gk total sample population lies between the prescr:'. bed lower limit and 9001 907. of the prescribed lower limit, two tendons, one on each side of (yq this tendon shall be checked for their lift off tsrce.

If both of W

s these adjacent tendons are found acceptable, the surveillance prograu

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may proceed considering the single deficiency as unique and acceptable.

The tendon (s) shall be restored to the required level of integrity.

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- N ie -t% ;m dicted br ud ?out of the

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oriillnil~ sampliipopulati% or, tendon lying below 90% of tne gresc the lift off force of a selec of abnormal degradation of th(c'ontainment structure.

i timb aA.

I ltogmig; tenden d b.

arfo nM, onin,-and material tests and inspections of a previously stressed ten g e or strand from one tendon of each

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group (hoop andYW), abe erruo4-*g-that over the entire length of (d M'O the removed wire or strand that:

9 4

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The tendon wires or strands are free of corrosion, cracks, and DMh

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damage.

W M f 240hl61(c[s 4

2.

A minimum tensile strength value of-NG-ksi-(guareer ^" " ' ^

[g

-strength-of--the-tendon-saat+r4*H f or at least three wire trJdW to WY5t*

l strand samples (one from each end and one at mid-length) cut s

}fj from each removed wire or strand.

Failure of any one of the

- 3 Q

wireorsfandsamplestomeet the minimum tensile strength test is (..M.#Uof abnormal degradation of thp' r%inment 0

d structure.

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• 1dc Performing a visual inspection of the following:

I 1.

Containment Surfaces - The structural

+y a t tl.e exposed accessible interior and exterior surfaces of the centainment e- -- --.)

shall be determined during the shutdown for, and prior to, each t

Type A containment leakage rate test (Specific tignj.6.1.2) by a visual inspection of these surf aces dh'a v8r4(IN. ing no apparent changes in appearance or other abnormal degradation (e.g.,

i widespread cracking, spalling and/or grease lapkage).

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• 2.

End Anchorages - The structural N egrity of the,cnd anchorages

' (e.g., bearing plates, stressing washers, shims ( wedges and anchtfp%pds) of all tendons ins ccted pursuant 4.6.1. a shall be demonet to Specification i

i changes hove occurred in the visual appearance of the end

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anchorage.

l wShiO 3.

Concrete Surfaces - The structural integrit.y of the concrete surfaces adjacent to the end anchcrages of tendons inspected LLC L - \\

9

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-S AN-ONOFRE-UN FT 3/4 6-M

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P CONTAINMEST SYSTEMS SURVEILLANCE REOUIREME'.TS (Continued)

=ex$1M W. tg jIthe crack patterns WYMIy-no-abnormal ::aterialshall be demonst pursuant pecification 4.6.1.

behavior, d

r fying the OPERABILITY of the sheathing filler grease by thecl

=following4.7[af!

1.

No significant voids (h c._ " P cf th : t-duct =1 - @

orthepresenceoffreewaterYh.hin the grease filler material, (taking into account temperature variations) 2.

No significant changes have occurred in the physical appearance of the sheathing filler grease.

3.

Minimum grease coverage exists for different parts of the anchorage system.

AW" WW A

e. Ved $.... cal propert-ies are witbin the tolerance limits specified I

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4.

Ch.

by the sheathing filler grease manufacturer.

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t 4. 6.1. 5.fi Unit 2 Post-Tensioning System The structural integr/ity of the pht.-tensioning system shall be demonstrated at the end of one, h

threeandf-i-v(ivesycarintervalsyears following the initial containment'5tru y

test and at f

, thereafter, by vis6 ally examining a y

representative sample-qf at least 13 tendons,.5 vertical and 8 hoop.

N The visual examination of'each tendon shall be made to the extent practical without dismantling load beaFing_compcnents of the anchorage.

concrete shall also be checked for' indication of abnormal material behavior.The sur Unless there is evidence of -abnor' mal degra'dation of the post-tensioning system ducing thelinst-three examinations, the 'nu:aber of tendons examined fduring subsequ_ent jest %nay be reduced to a representat{ve sample of at least 7 tendons, 3 vertical and 4 hoop.

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! Mo7e. *For each inspection, the tendons shall be selected on a random bat 4

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and to correlate the abserved data, one tendon from each group cf tendons, will be kept unchanged after the initial selection.

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TABLE 4.6-2

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TEhD*N LI:T-CFF FC'CE yedh1 (V)D t':s F

Tendon

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3 e2 u.9 4an i F'00P TEM'."5 Moden lirs* M leader Ends 1 M4.:.-tune

' ractan (kus)

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C07;TAl': MENT SYSTEMS A'; m m.i di /

JULY 1921 PRIMARY CONTAINMENT STRUCTURAL INTEGRITY ww LIMITING CONDITION FOR OPERATION s

k l

3.6.1.5 The structural integrity of the primary containment shall be maintained at a level consistent with the acceptance criteria in Specification 4.6.1.5.

f APPICABILITY: CONDITIONS 1, 2 and 3.

ACTION:

With the structural integrity of the primary containment not conforming to the above requirements, restore the structural inte ity Jo within/ersea l*

the 1imits &MhatEckatJWit #0TsW7EDWN

• W@4sjt/2 i

adi-CM SWTDownf =M '4 2MA*cana.

SURVEILLANCE REQUIREMENTS F.

4.6.1.5.1 Primary Containment Tendons: The structural integrity 'of the primary containment tendons for Unit I shall be demonstrated at the end of one, three, and five years following the initial containme'nt structural integrity test and at five year intervals thereafter, by:

f l

a.. Determining that a representative sample

• of at least 13 tendons, 5 vertical and 8 hoop, have an acceptance lift-off stress equal To or greater than the following design values: vertical tendon =

141.7 ksi; hoop tendon = 140.4 ksi A measured lift-off stress value which is within 3 percent less than the above applicable design values is acceptable since this is within the allowable accuracy tolerance of the measuring equipment.

A surveillance report shall be prepared and shall evaluate and compare the measured lift-off values to the required design values at the time of the test.

• For each inspection, the tendons shall be selected on a random but rcpresentative basis so that the sample group wil1 change somewhat for each inspection; however, to develop a history of tendon performance and to correlate the observed data, one tendon from each group of tendons, l

will be kept unchanged after the initial selection.

l July 1981

{) (',

LSCS-1 3/4 6-8 l

l l

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e.,

m._.._

00!iTAIEE;;T SYSTEM A"E;C",E :T 57 JULY 1981 SURVEILLANCE REQ'JIREMENTS (Continued)

The test shall include an unloading cycle in which one tendon, randomly selected, from each group of tendons (vertical and hoop) is detensioned to determine if any wires are broken or damaged. Tendons found acceptable during this test shall be retensioned to their observed lift-off stress, +3%.

During retensioning of these tenfons, the change in load ad-el;ongation shall be measured simultaneously.

If the lift-off stress of any one tendon in the total sample population is less than minimum acceptance stress, an adjacent tendon on each side of the defective tendon shall also be checked for lift-off stress.

If both of these adjacent tendons are found acceptable, the surveillance program may proceed considering the single deficiency as unique and acceptable. This single tendon shall be restored to the required level of integrity.

If more than one defective tendon out of the original sampla. population is unacceptable, a detailed evaluation shall be made to verify the integrity of the containment and to establish any evidence of abnormal degradation g

of the post tensioning system.

Unless there is evidence of abnormal degradation of the containment tendons during the first three tests of the tendons, the number of tendons checked for lift-off stress during subsequent tests may be reduced to a representative sample of at least 7 tendons, 3 vertical and1 hoop.

~

b.

Removing one wire or strand from each of a vertical and a hoop tendon checked for a lift-off force and determini1g over the entire length of the removed wire that:

~

1.

The tendon wir's or strands are free of corrosion, craeks and e

i l

damage.

2.

There are no changes in physical appearance of the sheathing filler grease, and 3.

There is minimum tensile strength value of 240,000' psi (guaranteed ultimate strength) for t' least three wire samples (one from each end and one at mid-length) cut from each removed wire.

I Failure of any one of the wire samples to meet the minimum tensile strength test is an indication of abnormal degradation and must be investigated.

4.6.1.5.2 End Anchoraces and Adjacent Concrete Surfaces The structural integrity of tne end anchorages of all tendons inspected pursuant to l

Specification 4.6.1.5.1 and the adjacent concrete surfaces shall be demonstrated by determining through inspection that no apparent changes LSCS-1 3/4 6-Ba July 1981 l

' 4 :.,: -

,n*

C9;CAI:riEt:T SYSTEMS A".E Z"E*,'

57 JULY W:]

t SURVEILLANCE REQUIRE!4ENTS (Continued) have occurred in the visual appearance of the end an ora e or the co e e

51*D;."N"M'"'AMy%lKhlik=w-np.

4.5.

5.3 Containment Surfaces The structural integrity of the exposed accessible interior and exterior surfaces of the containment, including the liner plate, shall be determined during the shutdown for each Type A ainment leakage rate test by a visual inspection of.these surfaces.

%.ir

• Y h

h 4.6.1.5.4 Repoh s Any abnormal degradation of the cont.ainment strutture detected during the above required tests and inspections shall be reported to he Conen_ission pursuant to Specification _6.6.g5 This report shall neludeadescriptionofthetendonconditTonQtheconditionofthe concrete (especially at tendon anchorages), the inspection procedure; the tolerances on crackingt and the corrective actions taken.

4.6..

Unit 2 Post-Tensioning System The structural int _

y of the post-t ning system shall be demonstrated at th of one, j

three and five.ye llowing the initial contai structural integrity test and at five year inte thereafter,'

visually examining a' representative sample of at least n

s, 5 vertical and 8 hoop.

The visual examination of each tend i

e made to the extent practical without dismantling load bear omponents o nehorage. The surrounding coacrete shall also be e ed for indication of abno material behavior.

Unless there is ence of abnormal degradation of the post-tens s

systen duri e first three examinations, the number of tendons exam during equent tests may be reduced to a representative sample of at st 7 tendons 3 vertical and 4 hoop.

a2+*HygA; LSCS-1 3/4 6-9 July 1981

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