ML17261A152
| ML17261A152 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 12/12/1979 |
| From: | White L ROCHESTER GAS & ELECTRIC CORP. |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17249A338 | List: |
| References | |
| NUDOCS 7912180418 | |
| Download: ML17261A152 (6) | |
Text
REGULATORV FQRHAl ION DISTRIBUTION SY
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ACCESSION NBR:7912180418 DOCNDATE: 79/12/12 NOTARIZED; NO, DOCKET FACIL:50-244 Robert'mioet Ginna Nucl ear P) ant r
. Uni t 1E Rochester 6
05000244 AOTH ~ NAME AUTHOR AFFILIATION NHlTKEL D ~,
Rochester Gas 8 Electric Corp, RECIPONAHE RECLPIENT, AFFILIATION ZIEtlANNgD ~ L ~
Opeiating Reactors Branch 2
sr sp SUBJECT; Forwards gvaluation of prestressed tendon forceps in response to NRC 791120 1ti',.
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89 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON D. WHITE. JR.
VICC PRCSIOCNT TCLCRNONC AREA CODS 71& 546.2700 December 12, 1979 Director of Nuclear Regulation Attention:
Mr. Dennis L. Ziemann, Chief Operating Reactors Branch 42 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Tendon Inspection and Lift-OffVerification Docket No.
50-244
Dear Mr. Ziemann:
In response to your letter dated November 20,
- 1979, we have prepared the following information.
Also, one copy of the report "Evaluation of Prestressed Tendon Forces Robert E. Ginna Nuclear Power Station" will be sent as Attachment 1 to this letter.
l.
The inspection of June 1977 was the eight year tendon surveillance required by the Technical Specification.
Some of the data recovered during that surveillance, although acceptable based on the Technical Specification requirements, did not appear to correlate well with previous data.
As a result of discussions with USNRC Regional IaE personnel and the containment designer, RGGE decided to perform a retest.
The retesting was completed in October 1979.
The results of an analysis of previous test data, as well as the retest, are con-tained in the attached repo'rt and Addendum I.
2.
The results of all tests are contained in Table 1 of the report and in Table I-1 and I-2 of Addendum I to the report.
3.
The report and Addendum I discuss possible causes of the tendon losses.
The requirements at the time of the design did not include actual relaxation tests and the predictions made were only for the 40 year period.
$ 01< P L1 Interim losses were not evaluated.
The current rate of
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q, loss appears to be compatible with 12% relaxation wire
@T p'q0 which the manufacturer states was the type manufactureS It SIa Pl S at that time.
The remedial action will be to retension
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DATE December 12, 1979 To Mr. Dennis L. Ziemann SHEET NO.
the tendons within the next year.
A retest of 14 retensioned tendons would be made 6 months later.
An evaluation of the losses in that period would determine the future inspection schedule.
4.
Sections 4.4, page 7; 4.11, page 13; 6.0, page 16; and 2.3, page I-3 of the report Addendum discuss the rock anchors.
It does not appear that these anchors are contributing in a significant manner to the tendon losses.
5.
Table 1 of the report and I-1 and 2 of the'ddendum indicate surveillance results.
Figures 4.1 through 4.42 of the report plot these results against time and include plots of predicted behavior as well.
If there are any questions regarding this information, please contact us.
Very truly yours, L. D. White, Jr.
LDW:mkv xc:
Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I U.S. Nuclear Regulatory Commission (Letter and Attachment 1)
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