ML18058B092
| ML18058B092 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 09/14/1992 |
| From: | Masciantonio A Office of Nuclear Reactor Regulation |
| To: | Slade G CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| TAC-M84017, NUDOCS 9209240505 | |
| Download: ML18058B092 (6) | |
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~*:.t\\J September 14, 1992 DISTRIBUTION:
Docket No. 50-255 I
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Mr. Gerald B. Slade Plant General Manager Consumers Power Company Palisades Plant 27780 Blue Star Memorial Highway Covert, Michi~an 49043
Dear Mr. Slade:
c:Docket::.Fi le NRC & Local PDRs BBoger JZwolinski MShuttleworth CTan, 7Hl5 AMasciantonio.
Palisades Plant W.
Shafer~ RI II
SUBJECT:
REVIEW OF PALISADES CONTAINMENT 20TH YEAR TENDON SURVEILLANCE REPORT REQUEST FOR ADDITIONAL INFORMATION (TAC NO. M84017)
By letter dated June 16, 1992, Consumers Power Company submitted the~O-y~ar containment tendon surveillance report for the Palisades plant.
The staff has reviewed the report and finds that more information is needed ~efore the review can be completed.
The required information is contained in the enclosure.
Your response to this request is greatly appreciated since your*
recent steam generator replacement project has provided, a valuable.opportunity for insights and information which would not normally be available..
. ',-* /
- The requested* information contained.in this letter affects fe*w~r. than ten:
respondents; OMB cl eararice is not required under P,*. L: 96-511.**
Enclosure:
As stated cc w/enclOsure:
See next a e OFFICE LA: POI 11-1 NAME- -.
DATE.
170022 ii'...
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~riginal sig~~d by:
I Armando Masciantonio,' Project Manager*
Project Directorate 1"11~1 Division of Reactor Projects - 111/IV/V Office of Nuclear Reactor Regufation*
PM: PDIII-1 PD: POii AMasciantoni o::.. LMarsh dmy
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1 /14-/92
'I I 11/92 FILENAME:PAL84017.LTR
Mr. Gerald B. Slade Consumers Power Company cc:
M. I. Miller, Esquire Sidley & Austin 54th Floor One First National Plaza Chicago, Illinois 60603 Mr. Thomas A. McNish, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Jerry Sarno Township Supervisor Covert Township 36197 M-140 Highway Covert, Michigan 49043 Office of the Governor Room l - Capitol Building Lansing, Michigan 48913 Mr. Patrick M. Donnely, Director Safety and Licensing Palisades Plant 27780 Blue Star Memorial Highway Covert, Michigan 49043 U.S. Nuclear Regulatory Commission Resident Inspector Office Palisades Plant 27782 Blue Star Memorial Highway Covert, Michigan 49043 Palisades Plant Nuclear Facilities and Environmental Monitoring Section Office Division of Radiological Health Department of Public Health 3423 N. Logan Street P. 0. Box 30195 Lansing, Michigan 48909 Gerald Charnoff, Esquire Shaw, Pittman, Potts and Trowbridge 2300 N Street, N. W.
Washington DC 20037 Mr. David L. Brannen, Vice President Palisades Generating Company c/o Bechtel Power Corporation P. 0.
Box 2166 Houston, Texas, 77252-2166 Roy W. Jones, Manager Strategic Program Development Westinghouse Electric Corporation 4350 Northern Pike Monroeville, Pennsylvania 15146
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Request for Additional Information Palisades 20th Year Tendon Surveillance Report Docket No. 50-255 Structural and Geosciences Branch
- 1. In the last paragraph of section 2 Item II, Sheathing Filler, you stated that grease leaks observed at 30 anchor locations beyond the selected surveillance tendons were repaired and the results are suaaar1zed in Table XIA.
We note from the table that the tendon grease cans which needed repair are those of the vertical tendons which were detensioned on one side of the SG transfer opening. There are similar detensioned tendons on the other side of the steam generator(SG) transfer opening,
which did. not have the same problem. Explain why there 1s such a difference. Besides the grease leakage at the anchor locations indicate if there are signs of grease leakage at locations away from the anchors:
Discuss the potential detrimental effect of grease leakage into concrete.
- 2. According to the information provided to the staff at the time of SG replacement, there were fifteen (I5) vertical tendons and thirty-seven(37) hoop tendons passing through the transfer opening which were detensioned and removed.
Such an opportunity is rare and more detailed and useful information than that from the periodic surveillance can be obtained and used for evaluating the tendon integrity and assessing the adequacy of the current tendon surveillance program. Provide, if you can, any information on your experience on these tendons.
- 3. The tendon surveillance performed recently is the sixth (20th year).
On the basis of the data collected from the six surveillances and from the SG replacement operation, a trend in the prestressing forces for each group of tendons can be established and any abnormality in the long term behavior of each group of tendons can be detected. Provide this information.
- 4. Data sheets II.O in PSC Procedure SQ.II tabulate the observed forces and elongation measurements for tendons 02-23, V 2I8 and 29 AE. Since the tendon behavior at tensioning is elastic, the force required for unit elongation for each tendon should be basically linear. We realize that the preliminary tensioning force (PTF) is used in part to straighten the slack rather to stretch the tendon.
On the basis of this understanding, the staff made an analysis of the information from the data sheets and the results of the analysis are shown in attached Table I. Of the three tendons detensioned and retensioned, the results for hoop tendon 29AE are most inconsistent.
On the basis of the above observation, your responses to the following questions are requested:
a) Provide reasons for the inconsistency in the results for hoop tendon 29AE as indicated in Table 1. Your corrective action as contained in NC/CA 4I7-002 does not answer this staff's concern.
b) In OS lI.O item (9.9.6.2) elongation variations for tendons D2-23, V2I8 and 29AE are given as -3.11,-10.31, and -1.71 respectively. Indicate the significance of these variations,in view of the fact that friction plays an important role and cannot be accurately evaluated, especially for the curved tendons.
y c) Without taking friction into consideration, provide the force required per unit elongation for each of the three tendons.
Indicate the length of each tendon.
- 5. Indicate how the lift-off force for each of tendons surveillanced is determined, noting that only the force at the instant when the tendon is lifted from the seating is to be counted as the lift-off force. The proce-dure described in item 9. 7. in PSC Procedure SQ 9.0 appears to be inadequate.
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{:1 TABLE 1 FORCE PER UNIT TENDON ELONGATION Stage Force Elongation Force/Elong. Force Elong.
Force/Elong.
(kip)
(in.)
(kip/in)
(kip)
(in.)
(kip/in)
FIELD END SHOP END Tendon No. D2-23 Step 1 350 3.0 350 4.0 PTF
-148
-1.9
-148
-3.6 Dif 202 1.1 183.64 202 0.4 505.00 Step 2 600 4.5 600 5.5 Step 1 -350 *
-3,0
-350
-4.0 Dif 250 1.5 166.67 250 1.5 166.67 LOF 649 4.8 625 5.7 Step 1 -350
-3.0
-350
-4.0 Dif 299 1.8 166.11 275
- 1. 7 161.76 LOF 649 4.8 625 5.7 Step 2 -600
-4.5
-600
-5.5 Dif 49 0.3 163.33 25 0,2 125.00 OSF 839 6.2 839 7.3 LOF
-649
-4.8
-625
-5.7 Dif 190 1.4 135. 71 214 1.6 133.75 Tandon No. 29 AE Step 1 350 4.3 350 4.75 PTF
-148
-3.0
-148
-3.50 Dif 202 1.3 155.38 202 1.25 161.60 Step 2 600 6.4 600 6.40 Step 1 -350
-4.3
-350
-3.50 Dif 250 2.1 119.05 250 2.90 86.21 LOF 564 6.2 685 6.90 Step 1 -350
-4.3
-350
-4.75 Dif 214 1.9 112.63 335 2.15 155.81 LOF 564 6.2 685 6.90 Step 2 -600
-6.4
-600
-6.40 Dif
- 36
-0.2 180.00 85 0.50 170.00 OSF 802 7.3 802 7.60 LOF
-564
-6.2
-685
-6.90 Dif 238 1.1 216.36 117
-0.70 167.14
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~t Table 1 (continued)
Stage Force Elongation Force/Elongation 0---
(kip)
(in)
(k1p/1n)
Tandon No. V-218 (Shop End)
Step 1 350 7.5 PTF
-148 -
-4.3 Dif 202 3.2 63.13 Step 2 600 11.4 Step 1 -350
-7.5 Dif 250 3.9 64.10 LOF 631 11.95 Step 1 -350
-7.50 Dif 281 4.45 63.15 LOF 631 11.95 Step 2 -600
-11.40 Dif 31 0.55 56.36 OSF 839 15.40 LOF
-631
-11.95 Dif 208 3.45 60.29