ML17320A388

Forwards Addl Info Re Masonry Wall Evaluation Performed Per IE Bulletin 80-11.Partition Wall 12-4049-W4 Deleted from safety-related Wall Category

ML17320A388
Person / Time
Site:	Cook
Issue date:	11/19/1982
From:	Hunter R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	Harold Denton Office of Nuclear Reactor Regulation
References
REF-SSINS-6820 AEP:NRC:0418F, AEP:NRC:418F, IEB-80-11, NUDOCS 8302250301
Download: ML17320A388 (13)

Text

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

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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:

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INDIANA 5 MICHIGAN'LECTRIC COMPANY P. 0.

BOX 18 BOWLING GREEN STATION NEW.YORK, N. Y. 10004 November j.9, 1982 AEP: NRC: 0418F Donald C. Cook Nuclear Plant Unit Nos.

1 and 2

Docket Nos. 50-315 and 50-316 License Nos.

DPR-58 and DPR-74 NRC IE BULLETIN NO. 80-11 (MASONRY WALLS)

REQUEST FOR ADDITIONAL INFORMATION Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Reulatory Commission Washington, 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 additional information on the masonry wall evaluation performed as per the requirements of the NRC IE Bulletin No. 80-11 for the Donald C. Cook Nuclear 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 Reference 2.

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

Furthermore, our review of the masonry walls data prompted by the preparation of Attachment 2 to this letter, has uncovered that one wall, No. 12-4049-W4, listed in our earlier response (Reference

1) was incorrectly classified as a safety-related wall.

This wall is a

partition wall between Unit 1 and Unit 2 and is located in the Turbine Building.

As such we are deleting wall No.

12-4049-W4 from the safety-related wall category (Item 34 in Attachment "B" to Reference 1).

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

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

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830225030i 82iii9 PDR ADQCK 050003i5 9

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This document has been prepared following Corporate Procedures which incorporate a reasonable set of controls to insure its accuracy and completeness prior to signature by the undersigned.

Very truly yours, R,

S. Hunter Vice President RSH/os cc:

John E, Dolan - Columbus M. P. Alexich R. W. Jurgensen W. G. Smith, Jr. -

Bridgman R. C. Callen G. Charnoff Joe Williams, Jr.

= NRC Resident Insp'ector at Cook Plant Bridgman

D.C.COOK NUCLEAR PLANT AEP:NRC:0418F ATTACHMENT 1 TO AEP:NRC:0418P The compressive strengths of the masonry and the mortar listed in the response to Etem 5 of Reference 2 are modified as follows:

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 PLANT l

AEP:NRC:0418F ATTACHMENT 2 TO AEP:NRC:0418F The following are Indiana

& Michigan Electric Company's responses to the four items included in Mr. Varga's letter of October 1982.

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

Res onse to Item 1

The masonry walls were erected as per AEP's Architectural Specification No. DCC-A139-QCS which did not require written documentation for field inspection during construction.

However, Pearson Construction Company, Inc. of Benton Harbor, Michigan, who was the construction contractor for the masonry walls at the D. C. Cook Plant at the time of plant construction has provided a verification letter (attached) stating that the Dur-0-wal reinforcement had been installed in the masonry walls as per the AEP drawings and specifications, Res onse to Item 2 Verification for proper anchorage and bonding of the Dur-0-wal reinforcement cannot be provided as the masonry walls were erected as uninspected construction.

To account for this lack of inspection, reduced allowable stresses were used for concrete and mortar in the reevaluation.

However, as noted in response to Item 4 noted below, with the exception of 5 walls listed in Table 3 of this Attachment, the walls can resist the seismic loads without the benefit of reinforcement provided by the Dur-O-wal.

Res onse to Item 3

Dur-0-wal reinforcing is a metallic reinforcing element and is made out of ASTM standard A82 steel for "Cold Drawn Steel Pire for Concrete Reinforcement."

The yield strength of this steel is 70,000 psi.

Although the Dur-0-wal is most often used to control cracking in the concrete masonry walls, it is capable of carrying tensile stresses existing in the wall in the direction of the reinforcement.

However, as indicated in the response to item 4, in the majority of the walls, the tensile stresses existing in the masonry walls is lower than the tensile capacity of the mortar and thus the masonry wall design is not dependent on the reinforcing strength of the Dur-O-wal.

Res onse to Item 4 The total number of safety-related walls that were reanalyzed is one hundred and sixteen (116).

Out of this total number of walls, seventeen (17) walls are encapsulated walls (see Table 1).

The remaining ninety-nine walls (99) are listed in Table 2.

This table provides a summary of the stresses in the 99 listed safety-related walls.

D. C.

COOK NUCLEAR PLANT AEP:NRC:0418F Table 3 is a summary of the rebar stresses for those five safety-related hollow block walls that were qualified by the Dur-0-wal reinforcing.

These walls are qualified based on the strength of the Dur0-wal reinforcement, because the allowable tensile stress in the mortar was reduced to acc'ount for the uninspected construction.

If the maximum allowable tensile stress of the mortar is used, which is permitted under inspected construction, then the calculated stresses will be within the allowable limits.

To confirm the existence of the Dur-0-wal reinforcing in the above five (5) walls, we are currently initiating efforts to scan these five walls using metal detectors or other suitable methods.

If we cannot verify the existence of the Dur-0-wal reinforcement from this inspection we will inform your office of the corrective 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 Wll 12-4026-W16, W18 12-4028-W3, W6, W9 12-4029-W3, W5 6

2 3

2 17

TABLE 2 D.C. COOK NUCLEAR PLANT P:NRC:0418F Masonry Wall Mortar Stress Summary (I. E.Bulletin 80-11)

Wall Number Solid Concrete Masonr Units 12 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, 19 12-4027-WS 12 4028 W2g 4g Sg 8g 12'8I 23, 26 12 4028 W24 ~

27 g 28 12 4028 W10 g 1 1 12-4028-W13, 14 Allowable Tensile Stress in Mortar (Uninspected)

(PSI)

49. 9

49. 9

49. 9

49. 9

49. 9

49. 9 49.9 49.9 Max. Calculated Tensile Stress In Mortar Por Worst Wall (PSI)

23. 9

29. 1

15. 1 43.8

20. 7 24.7 26.0 45.0 Total Number Sails 20 12 10 1

Hollow Concrete Masonr Units 12 4029 Wlg 2I 4g 6J 7I 8 12-4031"W2, 3

12-4031-Nl 1-4033-W1, 4

1-4033-W2, 3

1>>4034-Wl thru ll 12-4035-Wl, 2

2-4036-W1, 4

2-4036-W2, 3

2-4037-Nl thru ll

18. 2 18.2 18.2

18. 2

18. 2

18. 2

18. 2 18.2 18.2

18. 2 6.8

14. 8

31. 0*

14. 2 24.5*

3.3 13.3

14. 2 24.5*

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 mortar used with the solid masonry units and mo = 750 psi for Type N

mortar 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 PLANT P: NRC: 0418F TABLE 3 Z"

(I. E.Bulletin 80-11)

Wall Number Allowable Tensile Stress (ZSI)

Max. Calculated Tensile Stress In Rebar (ZSI)

Total Number Walla 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 cracked masonry 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.S 24O WRBT B RITAIN AvcNUC

~~

BRNToN HARBOR> MICK. 4eo22 cled>> s o>>Tet~

September 22, 1982 American Electric Power Co.

2 Broadway New York, New York 10004 Attention:

Mr. Bill Robinson Room 940 Re:

Donald'.

Cook Nuclear Plant Bridgman, Michigan Our Job No.

7082 Gentlemen:

Following your telephone inquiry of September 22nd, I checked with our mason

foreman, and he confirmed that we did install the Dur-0-Mal block reinforcing in the masonry walls on this project wherever called for on the drawings and as indicated in the specifications.

If you need any further information regarding this item, please feel free to,contact the undersigned.

\\

Very truly yours, PEARSON CONSTRUCTION COMPANY'NC PS/lb cc:

File Paul Scott, P.E.

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