REGUlA Y INFORMATION DISTRIBUTIO YSTEM (RIDS)

AOCESSION NBR:S302250301 DOO.DATE: S2/11/19 NOTARIZED: NO DOCKET,FACIL:50~3i5 Donald 0 ~ Cook Nuclear Power Plantg 'Uni,t i~ Indiana 8 0500031'5

,50 316 Donal.d O ~ Cook Nuclear, power Plant~ Unit 2~ =-Indiana 8 05000316'AUTH~ AAME AUTHOR AFFILIATION

HUNTER g R y'S t Indiana '8 Michigan Electric 'Co,'RECIP ~ NAME RECIPIENT AFFILIATION

,DENTONiH,Re Office« of Nuclear «Reactor -Regulationi Director

"SUBJEGT: Forwands addi i.nfo re masonry wall evaluation tperformed perIE" Bulletin 80 iioPar tition axial 1

1'2 4049 N0 deleted-fromsafety r.el a ted we 1 1 'ategory,

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INDIANA 5 MICHIGAN'LECTRIC COMPANYP. 0. BOX 18

BOWLING GREEN STATIONNEW .YORK, N. Y. 10004

November j.9, 1982AEP: NRC: 0418F

Donald C. Cook Nuclear Plant Unit Nos. 1 and 2Docket Nos. 50-315 and 50-316License Nos. DPR-58 and DPR-74NRC IE BULLETIN NO. 80-11 (MASONRY WALLS)REQUEST FOR ADDITIONAL INFORMATION

Mr. Harold R. Denton, DirectorOffice of Nuclear Reactor RegulationU. S. Nuclear Reulatory CommissionWashington, D. C 20555

Reference: (1) Letter No. AEP:NRC:0418C, dated October 30, 1981.(2) Letter No. AEP:NRC:0418E, dated August 20, 1982.

Dear Mr.Denton.'his

letter and its Attachments provide additionalinformation on the masonry wall evaluation performed as per therequirements of the NRC IE Bulletin No. 80-11 for the Donald C. CookNuclear Plant.

Attachment 1 revises our response to Question No. 5 of Mr. S.Varga's letter of July 13, 1982 contained in Attachment 1 to Reference2.

Attachment 2 contains our responses to the four questionsincluded with Mr. S. Varga's letter of October 4, 1982.

Furthermore, our review of the masonry walls data prompted bythe preparation of Attachment 2 to this letter, has uncovered that onewall, No. 12-4049-W4, listed in our earlier response (Reference 1) wasincorrectly classified as a safety-related wall. This wall is apartition wall between Unit 1 and Unit 2 and is located in the TurbineBuilding. As such we are deleting wall No. 12-4049-W4 from thesafety-related wall category (Item 34 in Attachment "B" to Reference1).

bL,ol(rf<A~;,D ~<..~Z.l&.

Certiiied Bydt~d9g%4%+Kh+1 AAAI'Iig ~

830225030i 82 i ii9PDR ADQCK 050003i59 PDR

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This document has been prepared following CorporateProcedures which incorporate a reasonable set of controls to insure itsaccuracy and completeness prior to signature by the undersigned.

Very truly yours,

R, S. HunterVice PresidentRSH/os

cc: John E, Dolan - ColumbusM. P. AlexichR. W. JurgensenW. G. Smith, Jr. - BridgmanR. C. CallenG. CharnoffJoe Williams, Jr.

= NRC Resident Insp'ector at Cook Plant — Bridgman

D.C.COOK NUCLEAR PLANTAEP:NRC:0418F

ATTACHMENT 1 TO AEP:NRC:0418P

The compressive strengths of the masonry and the mortarlisted in the response to Etem 5 of Reference 2 are modified asfollows:

Compressive strength of masonry:

Hollow masonry units - 1000 psi (ASTM Specification C90)

Solid masonry units — 1200 psi (ASTM Specification C145)

Compressive strength of mortar (ASTM Specification C270):

Type N mortar (used with hollow units) - 750 psi

Type M mortar (used with solid units) — 2500 psi

D.C.COOK NUCLEAR PLANTlAEP:NRC:0418F

ATTACHMENT 2 TO AEP:NRC:0418F

The following are Indiana & Michigan Electric Company'sresponses to the four items included in Mr. Varga's letter of October

1982. Item numbers noted in this Attachment are the same ones asthose in Mr. Varga's letter.

Res onse to Item 1

The masonry walls were erected as per AEP's ArchitecturalSpecification No. DCC-A139-QCS which did not require writtendocumentation for field inspection during construction. However,Pearson Construction Company, Inc. of Benton Harbor, Michigan, who wasthe construction contractor for the masonry walls at the D. C. CookPlant at the time of plant construction has provided a verificationletter (attached) stating that the Dur-0-wal reinforcement had beeninstalled in the masonry walls as per the AEP drawings andspecifications,

Res onse to Item 2

Verification for proper anchorage and bonding of theDur-0-wal reinforcement cannot be provided as the masonry walls wereerected as uninspected construction. To account for this lack ofinspection, reduced allowable stresses were used for concrete andmortar in the reevaluation. However, as noted in response to Item 4noted below, with the exception of 5 walls listed in Table 3 of thisAttachment, the walls can resist the seismic loads without the benefitof reinforcement provided by the Dur-O-wal.

Res onse to Item 3

Dur-0-wal reinforcing is a metallic reinforcing element andis made out of ASTM standard A82 steel for "Cold Drawn Steel Pire forConcrete Reinforcement." The yield strength of this steel is 70,000psi. Although the Dur-0-wal is most often used to control cracking inthe concrete masonry walls, it is capable of carrying tensile stressesexisting in the wall in the direction of the reinforcement. However, asindicated in the response to item 4, in the majority of the walls, thetensile stresses existing in the masonry walls is lower than thetensile capacity of the mortar and thus the masonry wall design is notdependent on the reinforcing strength of the Dur-O-wal.

Res onse to Item 4

The total number of safety-related walls that were reanalyzedis one hundred and sixteen (116). Out of this total number of walls,seventeen (17) walls are encapsulated walls (see Table 1). Theremaining ninety-nine walls (99) are listed in Table 2. This tableprovides a summary of the stresses in the 99 listed safety-relatedwalls.

D. C. COOK NUCLEAR PLANTAEP:NRC:0418F

Table 3 is a summary of the rebar stresses for those fivesafety-related hollow block walls that were qualified by the Dur-0-walreinforcing. These walls are qualified based on the strength of theDur0-wal reinforcement, because the allowable tensile stress in themortar was reduced to acc'ount for the uninspected construction. If themaximum allowable tensile stress of the mortar is used, which ispermitted under inspected construction, then the calculated stresseswill be within the allowable limits. To confirm the existence of theDur-0-wal reinforcing in the above five (5) walls, we are currentlyinitiating efforts to scan these five walls using metal detectors orother suitable methods.

If we cannot verify the existence of the Dur-0-walreinforcement from this inspection we will inform your office of thecorrective actions to be taken.

D. C. Cook Nuclear Plant

TABLE 1

List of Ence sulated Walls

IE Bulletin 80-11

Wall No. No. of Walls

12-4026-Wl through W6

12-4026-WS through Wll12-4026-W16, W1812-4028-W3, W6, W9

12-4029-W3, W5

6

232

17

TABLE 2

D.C. COOK NUCLEAR PLANTP:NRC:0418F

Masonry Wall Mortar Stress Summary

(I. E. Bulletin 80-11)

Wall Number

Solid Concrete Masonr Units12 4025 Wlg 2g 3~ 4g 9 thru 16f

21 thru 28

12 4026 W7 g 12 thru 15'7 g

19 thru 24

12-4027-Nl, 7, 10 thru 15, 18, 1912-4027-WS

12 4028 W2g 4g Sg 8g 12'8I23, 26

12 4028 W24 ~ 27 g 2812 4028 W10 g 1 1„12-4028-W13, 14

Allowable TensileStress in Mortar

(Uninspected)(PSI)

49. 9

49. 9

49. 949. 9

49. 949. 949.949.9

Max. CalculatedTensile Stress InMortar Por WorstWall (PSI)

23. 9

29. 1

15. 143.8

20. 724.726.045.0

TotalNumberSails

20

12

101

Hollow Concrete Masonr Units12 4029 Wlg 2I 4g 6J 7I 8

12-4031"W2, 312-4031-Nl

1-4033-W1, 41-4033-W2, 3

1»4034-Wl thru ll12-4035-Wl, 2

2-4036-W1, 42-4036-W2, 3

2-4037-Nl thru ll

18. 2

18.218.2

18. 218. 2

18. 2

18. 2

18.218.2

18. 2

6.8

14. 831. 0*

14. 224.5*

3.3

13.3

14. 224.5*

3.3

99

NOTES: 1) The allowable stresses are derived per Table 10.1 of ACI-531-79"Building Code Requirements for Concrete Masonry Structures."The mortar strengths used are m = 2SOO psi for Type M mortarused with the solid masonry units and mo = 750 psi for Type Nmortar used with the hollow masonry units.

2) Masonry stresses are calculated for uncracked section.*) Walls 12-4031-Wl, 1-4033-N2, 3 and 2-4036-W2, 3 which exceed

reduced allowables are summarized in Table 3.

.C.COOK NUCLEAR PLANTP: NRC: 0418F

TABLE 3

Z—"(I. E. Bulletin 80-11)

Wall Number

Allowable TensileStress

(ZSI)

Max. CalculatedTensile Stress

In Rebar(ZSI)

TotalNumberWalla

12-4031-Wl

1-4033-W2, 3

2-4036-W2, 3

60;0

60'

60. 0

43a 9

35. 4

35. 4

NOTE: Rebar stresses are calculated based on crackedmasonry section.

P. O. Go x 126

D. C. COOK NUCLEAR PLANT:NRC:0418F

TKI.: 6l6/926 -722 l

'P'ERSON.'ONSTR.U CTION COM PAN Y.'t:Nc„

CENE P AL CONTR. ACTOR.S24O WRBT B RITAIN AvcNUC ~~ BRNToN HARBOR> MICK. 4eo22

cled» so»Tet~

September 22, 1982

American Electric Power Co.2 BroadwayNew York, New York 10004

Attention: Mr. Bill RobinsonRoom 940

Re: Donald'. Cook Nuclear PlantBridgman, MichiganOur Job No. 7082

Gentlemen:

Following your telephone inquiry of September 22nd, I checkedwith our mason foreman, and he confirmed that we did installthe Dur-0-Mal block reinforcing in the masonry walls on thisproject wherever called for on the drawings and as indicatedin the specifications.If you need any further information regarding this item, pleasefeel free to,contact the undersigned.

\

Very truly yours,

PEARSON CONSTRUCTION COMPANY'NC

PS/lb

cc: File

Paul Scott, P.E.

0C

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