ML17255A598
| ML17255A598 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 01/10/1984 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0821, RTR-NUREG-821 NUDOCS 8401170009 | |
| Download: ML17255A598 (6) | |
Text
REGULATOR NFORMATION DISTRIBUTION S EM (RIDS)
ACCESSION NBR:8401170009 DOO,DATE: 84/01/10 NOTARIZED; NO DOCKET FACIL'!50 244 Rober t Emmet Ginna Nuclear Plant~
Uni,t 1 r.Rochester G
05000244 AUTHBNAME AUTHOR AFFILIATION MAIREJ ~ EB Rochester Gas
& Electric Corp,
'REC I P ~ NAME RECIPIENT AFFILIATION GRUTCHFIELDED ~
Operating Reactors Branch 5
SUBJECT:
Submits general plan to fdentify
& resolve outstanding plant~specfffc issues re Suppl 1 to NUREG 0821'"Cable Tray Seismic Evaluation,,"Final schedule will be, established after progress toward resolution of NRC questions
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11A1E ROCHESTER GAS AND ELECTRIC CORPORATION
~ 89 EAST AVENUE, ROCHESTER, N.Y. 14649 JOHN E, MAIER Vice Preeklent TELEPHONE AREA CODE 7ld 546-2700 January 10, 1984 Director of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Cable Tray Seismic Evaluation R. E. Ginna Nuclear Power Plant Docket No.
50-244
Dear Mr. Crutchfield:
As noted in Section 2.7.5 of NUREG-0821, Supplement 1, August
- 1983, RG&E committed to developing a program to address cable tray seismic capability by the end of 1983.
As part of the SEP Owners Group, two reports dated April 29, 1983 and August 31, 1983 were submitted to the NRC concerning the Owners Group efforts for seismic testing and analysis of cable tray and support configurations.
The NRC has responded with a set of questions by letter dated November 23, 1983 from Christopher Grimes to Richard Schaffstall of KMC, Inc.
Most of these questions were discussed in a meeting of November 29, 1983 between the NRC and the SEP Owners Group.
It is expected that the majority of these questions can be resolved in the first calendar quarter of 1984.
Based on the results of the Owners Group testing and analysis
- program, and the anticipated resolution of NRC comments concerning the program, RGaE has developed a general plan to identify and resolve outstanding plant-specific issues, if necessary:
Following NRC review and approval of the Owners Group report, including any resultant revisions to the report, RGSE will survey at Ginna Station the set of parameters identified in the report as most indicative of cable tray support system seismic capability (e.g.,
hanger
- spacing, type of support, seismic response
- spectra, tray loading).
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DATE January 10, 1984 Mr. Dennis M. Crutchfield SHEET NO.
2.
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RG&E will compare the acceptable values of these parameters (the envelope),
based on the seismic analysis included in the August report, with the plant-specific parameter values for Ginna Station cable tray support systems.
RG&E will evaluate cable tray supports which have elements of the seismic parameter set significantly outside the envelope.
This evaluation will determine whether factors such as actual tray loading and location, or local seismic response spectra, will compensate for the deviations.
The evaluation will be performed for a sample set of cable trays supports, chosen by experienced engineering
- judgment, which are considered suitably conservative to be representative of the cable tray supports at Ginna Station.
4 ~
Where unresolved differences exist, RG&E will evaluate the potential for cable tray failure, and the possible consequences of such failures, due to the out-of-range parameters.
5.
Where safe shutdown margins are considered to be significantly reduced, RG&E will develop a cost-effective set of hardware modifications.
RG&E considers that the overall potential for cable tray system seismic failure is low, based on the absence of failures during the SEP Owners Group testing program, tests previously performed by the Bechtel Corporation, and the supporting analyses.
Therefore, no schedule has yet been established for final resolution of this issue at Ginna.
The final schedule will be established after progress toward resolution of NRC questions
- occurs, and the NRC indicates acceptance of the SEP Owners Group report.
Very truly yours, John E. Maier
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