ML17258A819
| ML17258A819 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 02/13/1981 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8102250608 | |
| Download: ML17258A819 (5) | |
Text
REGULATORY I FORMATION DISTRIBUTION SYS
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ACCESSION NBR 5 81022S0608 DOC ~ DATE: 81/02/13 NOTARIZED!
NO DOCKET' FACIL;:50~244 Rober t. Emmet>> Ginna Nuclear I Pl anti Unit 1r Rochester I G 05000244 AUTH~ N AflEs AUTHOR AF FILIATION MAIERtJ's E "0 Rochester.
Gas L Electric Corp.
RECIP ~ NAME RECIPIENT AFFILIATION CRUTCHFIELDEDB'perating Reactors Branch 5
SUBJECT:
Confirms 810203 telcon with A/E L
NRC re post tensioned containment tendons, Existing load cells on tendons 53r93 8
133 will be: tested for operability,Load cell from 'tendon 13 will be removed 8
sent>> to lab for regag)ng, DISTRIBUTION CODEs ASSIS COPIES RECEIVED>>LTR.
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ROCH ES TER GAS AND ELEC TRIC CORPORATION 1
o 89 EAST AVENUE, ROCHESTER, N.Y. 14649 February 13, 1981 HN E ~
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- sl CQ 1g Directb'r of nuclear Reactor Regulation Attentgbn:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.S. Nuclear Regulatory Commission Washington, DC 20555 TELEPHONC ARCA COOE 710 546.2700
Subject:
Containment Vessel Tendon Evaluation Program Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Crutchfield:
This letter confirms a conference call held on February 3
between representatives of RGB, our architect/engineer Gilbert Associates, and you',and members of your Staff regarding the Ginna post-tensioned containment tendons.
We'escribed our plan to implement a program for monitoring the tendons.
The following is the sequence of measures we plan to undertake to implement the program:
1)
Test existing load cells on tendons 53, 93 and 133 for operability.
2)
Remove load cell from tendon 13 (currently inoperable) and send to a laboratory for regaging.
3)
Instrument the tendon jacking system pull-rod with a strain gage and calibrate.
4)
Reinstall load cell on tendon 13 and calibrate all four load cells with the modified pull-rod.
5)
Connect load cells to a recording system.
6)
Record load cell data once each working day (5 days per week during a.normal week).
7)
Review load cell data on a weekly, basis for trends.
We will notify the NRC if the data indicate a significant loss of prestress before it reaches the technical speci-fication level of (0.6)
GUTS.
Error in the system is estimated at k2%.
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ROCHESTER GAS AND ELECTRIC CORP.
DATE February 13, 1981 To Mr. Dennis M. Crutchfield SHEET NO.
We estimate that it will take approximately 6 (six) weeks to implement this program.
Very truly yours, Jo E. Maier JEM/bdk xc:
Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I U.S. Nuclear Regulatory Commission