ML17139A638
| ML17139A638 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 04/05/1982 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| References | |
| NUDOCS 8204290479 | |
| Download: ML17139A638 (5) | |
Text
DISTRIBUTION:
Docket File MDLynch LBA'2 File DEisenhut/RPurple RTedesco ASchwencer RPerch EHylton
- Cutchin, OELD OIRE Region I Resi'dent Insp 6
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PRC NSIC NRC PDR Local PDR ACRS (16) i~Docket Mos.
50-387~/388 Mr. Norman W. Curtis Vfce President Engineering A Construction Pennsylvania Power 8 Light Company Allentown, Pennsyl vinf 18101
Dear Hr. Cur tis:
The conditions assumed by this vendor for its "worst case" calculation of the hydrodynamic loads were:
( 1) a design basis opening time of 20.-
'illiseconds for the inlet line scram valve; and (2 )
a scram during the star t-up phase of the plant with no pressure in the reactor vessel.
The vendor als'o stated that its modelinq of the CRD system may not be anoro-priate which could cause the calculated hydrodynamic loads to be insuf-ficiently accurate.
Our concern in this matter is that the hydrodynamic loads in the CRD system for,your facility may not have been properly evaluated.
Accordingly, 1~e will consider this matter to be an open item on your docket unti'I we can resolve this issue.
As part of our continuing review nf your application for an operating license, we request that you provide the following informatfon for your facility:
1.
The design basis opening time for the inlet line scram valve.
2.
An evaluation of the hydrodynamic loads fn your CRD system resulting from actuation of the inlet line scram valve using the design basis opening time specified fn Item 1.
RVollmer 9
RHartfiel PA~P~ 09 i~82~
Subject:
"Fast Scram" Hydrodynamic Loads on Control Rod Drfve ermseuggzuttjz@,z~
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'tlOC Me were recently informed by a vendor'of control rod drive (CRD) s of a potential reportable condition applicable to boiling water reac (Enclosure 1).
Specifically, this vendor indicates that its analysis of the hydrodynamic loads in the piping and on the supports of a particular CRD system for a "worst case" condition resulted in structural loads whfch were larger than some of the previous design loads for this system.
These larger loads result from a rapid actuation of the CRD.
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A description of the conditions and-configurations of the*plant which result fn the.maximum hydrodynamic-loads fn the CRD system.
A statement regarding the appropriateness of the mathematical model used to calculate the hydrodynamic loads in the CRD system resulting from a scram.
S.
A coITIparfson of the hydrodynamfc loads evaluated in Item 2 with the present design basis loads for the CRD system.
In the event that the hydrodynamic loads calculated for your facility exceed the present design basis structural loads for the CRD system, indicate which cenponents are affected and submit a proposed plan for structurally refnforcfng the affected components.
Please indicate within 7 days of receipt of this letter, the date by which you can respond to our request.
If you have any questions on this matter, please contact the Project Manager Robert Perch, at (301) 492-8136.
Sincerely,
Enclosure:
As stated A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing--
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Mr. Norman W. Curtis Vice President Engineering and Construction Pennsylvania Power 8 Light Company Al 1 entown, Pennsyl vania 18101 ccs:
Jay Silberg, Esquire
- Shaw, Pittman, Potts
& Trowbridge 1800 M Street, N.
W.
Washington, D. C. 20036 Edward:.M. Nagel, Esquire General Counsel and Secretary Pennsylvania Power 4 Light Ccmpany 2 North Ninth Street Allentown, Pennsylvania 18101 Mr. Willian E. Barberich Nuclear Licensing Group Supervisor Pennsylvania Power 8 Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Mr. G.
Rhodes Resi.dent Inspector P. 0.
Box 52 Shickshinny, Pennsylvania 18655 Gerald R. Schultz, Esquire Susquehanna Environmental Advocates P. 0.
Box 1560 Wilkes-Barre, Pennsylvania 18703 Mr. E. B. Poser Project Engineer Bechtel Power Corporation P. 0.
Box 3965 San Francisco, California 94119 Dr. Judith H. Johnsrud Co-Director Environmental Coalition on Nuclear Powr 433 Orlando Avenue State College, Pennsylvania 16801 Mr. Thomas M. Gerusky, Director Bureau of Radiation Protection Resources Commonwealth of Pennsylvania P. 0.
Box 2063 Harrisburg, Pennsylvania 17120 Ms. Colleen Marsh P. 0.
Box 538A, RD g4 Mountain Top, Pennsylvania 18707 Mr. Thomas J. Halligan Correspondent The Citizens Against Nuclear Dangers P. 0.
Box 5
- Scranton, Pennsylvania 18501 Mr. J.
W. Millard Project Manager Mail Code 395 General Electric Company 175 Curtner Avenue San Jose, California 95125
- Robert, W. Adler, Esquire Office of Attorney General 505 Executive House P. 0.
Box 2357 Harrisburg, Pennsylvania 17120