ML20140H609
| ML20140H609 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/08/1997 |
| From: | Buckley B NRC (Affiliation Not Assigned) |
| To: | Langenbach J GENERAL PUBLIC UTILITIES CORP. |
| Shared Package | |
| ML20140G507 | List: |
| References | |
| GL-92-08, GL-92-8, TAC-M85615, NUDOCS 9705130197 | |
| Download: ML20140H609 (3) | |
Text
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May 8, 1997 i
Mr. James W. Langenbach Vice President and Director, TMI GPU Nuclear Corporation i
Route 441 South P.O. Box 480 Middletown, PA 17057-0480 i
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING THERM 0-LAG RELATED TO 4
AMPACITY DERATING ISSUES FOR THREE MILE ISLAND UNIT 1 (TAC NO.
i M85615)
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By letter dated October 22, 1996, GPU Nuclear Corporation responded to our request for additional information (RAI) related to Generic letter 92-08 "Thermo-Lag 330-1 Fire Barriers" for Three Mile Island, Unit 1.
Based on our review of your response, we find that additional information, as described in
'the enclosure, is required in order to continue our review. We request that j
you respond within 45 days of receipt of this letter.
Sincerely, Original signed by Bart C. Buckley, Senior Project Manager Project Directorate I-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-289
Enclosure:
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- s' Three Mile Island Nuclear Station, Unit No. I cc:
Michael Ross Robert B. Borsum Director, O&M, TMI B&W Nuclear Technologies GPU Nuclear Corporation Suite 525 P.O. Box 480 1700 Rockville Pike Middletown, PA 17057 Rockville, MD 20852 John C. Fornicola Director, Planning and William Dornsife, Acting Director Bureau of Radiation Protection Regulatory Affairs Pennsylvania Department of GPU Nuclear Corporation Environmental Resources l
100 Interpace Parkway P.O. Box 2063 Parsippany, NJ 07054 Harrisburg, PA 17120 Jack S. Wetmore Dr. Judith Johnsrud Manager, TMI Regulatory Affairs National Energy Committee GPU Nuclear Corporation Sierra Club P.O.~ Box 480 433 Orlando Avenue Middletown, PA 17057 State College, PA 16803 Ernest L. Blake, Jr., Esquire Shaw, Pittman, Potts & Trowbridge 2300 N Street, NW.
Washington, DC 20037 Chairman Board of County Commissioners of Dauphin County Dauphin County Courthouse l
Harrisburg, PA 17120 Chairman Board uf Supervisors i
of Londonderry Township R.D. fl,'Geyers Church Road Middletown, PA 17057 Michele G. Evans Senior Resident Inspector (TMI-1)
U.S. Nuclear Regulatory Comission P.O. Box 311 Middletown,'PA 17057 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King cf Prussia, PA 19406 i
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REQUEST FOR ADDITIONAL INFORMATION i
THREE MILE ISLAM. UNIT 1 i
j
' FIRE BARRIER AMPACITY DERATING ISSUES (TAC N0. M85615) l i
1)
Sandia National Laboratories (SNL) made the following finding after a i
review of the licensee's cable ampacity assessment method which is based on the random fill tray correction factors from IPCEA P-46-426:
The methodology applied by the licensee was taken from 3
i IPCEA P-46-426, which in turn cites IPCEA publication P-33-440 as the basis for the cited ampacity correction i
factors for random fill trays.
ICEA P-54-440 specifically states that the P-33-440 (a.k.a., P-46-426) methodology i
for random fill trays is superseded by the P-54-440 approach. Hence, SNL finds that the licensee has applied l
an outdated and inappropriate methodology to the analysis i
of its cable tray ampacity limits. While licensee approach may actually be conservative for some of the cases examined, SNL also demonstrated that the approach
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can lead to non-conservative results as well. SNL finds i
I that the P-54-440 methodology is applicable to the licensee cases and should be included in the evaluation.
1 Given the above finding, the licensee is requested to provide an assessment of the applicable ampacity limits using the ICEA P-54-440 i
methodology for any cable in a cable tray with three or more cables and i
for those cables with an available ampacity margin (i.e., after the j
application of derating factors) of 30% or less including the following i
seven circuits. recommended by SNL: LS6, MEl, ME2, M811 (winter configuration only), MC12 (winter configuration only), CH61 and LS5.
2)
It should be noted that the licensee response to the staff question regarding an assessment of overloaded cables as detailed in the Request i
for Information dated 7/5/96 may require reevaluation given satisfactory l
resolution for the concerns stated in Item 1 above.
In addition, the licensee is requested to conservatively estimate the remaining cable life for any cables which may have operated under overloaded conditions.
4 l
3)
Given that SNL noted apparent depth of fill and conductor discrepancies l
in the review of the Tray 531/533 case, the licensee is requested to document the applicable calculations to sufficient detail that both the depth of fill and ampacRy limit calculations can be verified by SNL.
(See Section 2.2.3 of tM SNL Letter Report (Attachment 1(a)) for j
further details) i.
i' - (a): Letter report to U.S. NRC, Rev. O, dated April 10, 1997, prepared by Steve Nowlen of Sandia National Laboratories.
ENCLOSURE l