ML20237D157
| ML20237D157 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/20/1998 |
| From: | Cruse C BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9808250104 | |
| Download: ML20237D157 (7) | |
Text
CHARLES II. CRUSE Baltimore Gas and Electric Company Vice President Calven Cliffs Nuclear Power Plant Nuclear Energy 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 495-4455 August 20,1998 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Response to Verbal Request Regarding Containment Tendon Long-Term Corrective Action Plan
REFERENCES:
(a)
Letter from Mr. A. W. Dromerick (NRC) to Mr. C. H. Cruse (BGE),
dated January 23, 1998, Review of Containment Tendon Evaluation Report - Calvert Cliffs Nuclear Power Plant, Unit Nos. I and 2 (TAC Nos. M99880 and M99881)
(b)
Letter from Mr. C. H. Cruse (BGE) to NRC Document Control Desk, dated May 14,1998, Containment Tendon Long-Term Corrective Action Plan (c)
Letter from Mr. C. II. Cruse (BGE) to NRC Document Control Desk, dated October 28,1997, Containment Tendon Engineering Evaluation In response to the NRC requirement contained in Reference (a), by letter dated May 14,1998, we provided our long-term corrective action plan regarding the Calvert Cliffs Nuclear Power Plant Units 1 and 2 Containment tendon degradation (Reference b). On July 1,1998, we held a teleconference with the NRC staff to discuss the long-term corrective action provided in Reference (b). This letter provides the information requested by the staff during the course of the July 1,1998, te!cconference.
hPC Request No.1 Provide a tabulation of the Unit 2 Containment vertical tendon hftoffforces, similar to the one provided for Unit 1 in Appendix B ofReference (c).
BGE Response l
i Attachment (1) to this letter contains the requested information.
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Y-t 9808250104 980820 FDR ADOCK 05000317 P
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~ Documtnt Control Desk August 20,1998 l
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1 NRC Request No. 2 in Reference (b), BGE [ Baltimore Gas and Electric Company} has stated that all vertical tendons I
previously identified as containing severely corroded wires will be re-inspected by December 31,1999.
The inspection will include removal of the upper grease caps and a visual inspection of the button-l headed wires to determine if additional breaks have occurred. What actions will be taken by BGE if additional broken tendon wires were to befoundduring the re-inspection?
i BGE Response J
If additional broken tendon wires were to be found during the re-inspection of the severely corroded b
tendons, BGE will re-evaluate the respective Containment Structure's operability and will assess the need to perform additional inspection on the Containment Structure's remaining tendon population.
j.
Should you have further questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours, L
[MW for L
Charles II. Cruse Vice President Nuclear Energy CHC/GT/ dim
Attachment:
(1) Unit 2 - Summary of Vertical Tendons Liftoff Forces cc:
R. S. Fleishman, Esquire
- 11. J. Miller, NRC l
J. E. Silberg, Esquire Resident Inspector,NRC l
S. S. Bajwa, NRC R. I. McLean, DNR A. W. Dromerick, NRC J.11. Walter, PSC l
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ATTACHMENT m l
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Unit 2 - Summary of Vertical Tendons Liftoff Forces l
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l Baltimore Gas & Electric Company Docket Nos. 50-317 and 50-318 Aagust 20,1998 i
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i Unit 2 - Summary of Vortieni Tandon Liftoff Forcas 1
Tendon As-Found Average Comments Tendon As Found Average Comments Number Liftoff (Kips)
Number Liftoff (Kips)
(Kips)
(Kips) 12V01 Note 1 584 23V01 Note 1 512 12V02 719 719 23V02 Note 1 633 12V03 656 G56 23V03 685 685 l
l 12V04 677 677 23V04 705 705 12V05 668 668 23V05 654 654 12V06 664 664 23V06 609 609 Note 2 - DES 12V07 666 666 23V07 706 706 12V08 675 675 23V08 699 699 12V09 6S7 687 23V09 660 660 l
12V10 707 707 23V10 720 720 l
l 12V11 725 725 Note 2 - DES 23V11 672 672 Note 2 - DES 12V12 674 674 23V12 681 681 Note 2 - DES j
12V13 Note 1 555 23V13 702 702 I
12V14 668 668 23V14 646 646 l
12V15 686 686 23V15 Note 1 525 12V16 678 678 23V16 Note 1 667 l
12V17 759 759 23V17 717 717 12V18 707 707 23V18 681 681 I
12V19 654 654 23V19 Note 1 550 Note 2 - DES 12V20 666 666 23V20 658 658 12V21 667 667 23V21 Note 1 650 Note 2 - DEG l
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12V22 718 718 23V22 701 701 Note 2 - DES l
l 12V23 741 741 23V23 662 662 Note 2 - DES 12V24 626 626 23V24 661 661 Note 2 - DES 12V25 692 692 Note 2 - DES 23V25 682 682 Note 2 - DES 12V26 713 713 23V26 625 625 l
12V27 692 692 23V27 708 708 j
12V28 691 691 23V28 620 620 12V29 704 704 23V29 667 667
-l 12V30 Note 1 629 23V30 639 639 12V31 683 683 23V31 706 706 l
12V32 656 656 23V32 701 701 12V33 640 640 23V33 687 687 12V34 668 668 23V34 677 677 Page 1 of 4 L __ -_ _
I Unit 2 - Summary of Vertical Tendon Liftoff Forces 2
lendon As-Found Average Ccmments Tendon As-Found Average Comments Number Liftoff (Kips)
Number Liftoff (Kips)
(Kips)
(Kips) 34V01 658 658 45V01 664 664 34V02 672 672 45V02 716 716 34V03 659 659 45V03 688 688 l
34V04 691 691 45V04 Note 1 698 l
34V05 677 677 45V05 Note 1 631 l
34V06 680 680 45V06 Note 1 540 34V07 670 670 45V07 Note 1 600 34V08 710 710 45V08 Note 1 524 Note 2 - DES l
34V09 Note 1 521 45V09 641 641 34V10 679 679 45V10 Note 1 500 Note 2 - DES 34V11 690 690 45V11 687 687 l
34V12 692 692 45V12 Note 1 604 Note 2 - DES j
34V13 Note 1 655 Note 2 - DES 45V13 Note 1 585 34V14 Note 1 654 Note 2 - DES 45V14 Note 1 i
602 34V15 633 633 45V15 686 686 l
34V16 692 692 45V16 632 632 34V17 Note 1 632 45V17 685 685 34V18 Note 1 663 45V18 562 562 l
34V19 704 704 45V19 Note 1 614 34V20 667 667 45V20 700 700 Note 2 - DES 34V21 Note 1 666 45V21 688 688 34V22 685 685 45V22 656 656 Note 2 - DES 34V23 668 668 45V23 652 652 34V24 695 695 45V24 698 698 Note 2 - DES 34V25 Note 1 585 45V25 Note 1 625 34V26 681 681 45V26 688 688 34V27 682 682 45V27 Note 1 463 34V28 670 670 45V28 690 690 34V29 683 683 45V29 678 678 l
34V30 Note 1 654 45V30 678 678 34V31 663 663 45V31 663 663 34V32 673 673 45V32 Note 1 635 34V33 684 684 45V33 644 644 45V34 698 698 j
34V34 696 696 i
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Unit 2 - Summary of Vertical Tendon Liftoff Forces Tendon As-Found Average Comments Tendon As-Found Average Comments Number Liftoff (Kips)
Number Liftoff (Kips)
(Kips)
(Kips) 56V01 608 608 61V01 671 671 56V02 682 682 61V02 707 707 56V03 641 641 61V03 705 705 66V04 692 692 61V04 702 702 56V05 683 683 61V05 697 697 i
56V06 644 644 61V06 681 681 56V07 644 644 61V07 674 674 56V08 633 633 61V08 687 687 56V09 667 667 61V09 673 673 l
56V10 684 684 61V10 708 708 56V11 649 649 61V11 632 632 56V12 669 669 61V12 676 676 56V13 Note 1 613 61V13 673 673 S6V14 675 675 61V14 698 698 Note 2 - DES 56V15 673 673 61V15 701 701 Note 2 - DES 56V16 662 662 61V16 712 712 Note 2 - DES l
56V17 674 674 Note 2 - DES 61V17 670 670 Note 2 - DES 56V18 673 673 Note 2 - DES 61V18 Note 1 676 DES 56V19 656 656 61V19 681 681 Note 2 - DES I
56V20 678 678 61V20 645 645 Note 2 - DES 56V21 638 638 61V21 617 611 Note 2 - DES 56V22 624 624 61V22 701 701 Note 2 - DES 56V23 650 650 61V23 674 674 56V24 641 641 61V24 Note 1 684 56V25 654 654 61V25 671 671 56V26 691 691 61V26 656 656 56V27 645 645 61V27 668 668 56V28 674 674 61V28 689 689 56V29 625 625 61V29 635 635 56V30 680 680 61V30 747 747 56V31 Note 1 639 61V31 682 682 56V32 Note 1 674 61V32 708 708 56V33 Note 1 694 61V33 671 671 56V34 660 660 61V34 650 650 Page 3 of 4
Unit 2 - Summary of Vertical Tendon Liftoff Forces Total Of Vertical Tendon Liftoff Forces =
135373 kips Total Number Of Effective Tendons =
204 Average Liftoff Force Per Tendon =
664 kips / tendon Notes:
- 1. The average lift load shown is the final running average for the noted tendon.
These averages result due to differences between the shim stack liftoffs.
- 2. T.5a average lift loads shown are the readings taken at the top end only for the noted double end stressed (DES) tendon.
- 3. The Unit 2 Containment Vertical Tendon System is made up of 204 tendons.
- 4. The vertical design basis load is 114711 Kips which is less than the cumulative vertical prestress load of 135373 Kips.
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