ML19281B396
| ML19281B396 | |
| Person / Time | |
|---|---|
| Issue date: | 04/26/1979 |
| From: | Baer R Office of Nuclear Reactor Regulation |
| To: | Clark C EDERER, INC. |
| References | |
| NUDOCS 7905250050 | |
| Download: ML19281B396 (5) | |
Text
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UNITED STATES
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't NUCLEAR REGULATORY COMMiss!ON 3,( % ) j WASHINGTON, D. C. 20555
[
op a c.1979 Mr. C. William Clark, Jr.
Chief Engineer Ederer Incorporated P. O. Box 24708 Seattle, Washington 98124
Dear Mr. Clark:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON EDERER'S TOPICAL REPORT EDR-1 Enclosed is a request for additional information and clarifications which we require to co'nplete our evaluation of your Generic Licensing Topical Report EDR-1. We would like to suggest that you respond by providing replacement pages in the body of your topical report.
Our questions with appropriate references to the responding text then may be included as an appendix. We find that this method of exchanging information assures a final product that is clear and unambiguous.
We are coordinating the review of your topical report EDR-1 and the operating license application for the Midland Plant, Units 1 and 2.
Therefore, please submit a schedule for responding to the enclosed request by May 15, 1979.
Based on your schedule for response, the status of the Midland Plant review and our resources, we will pre-pare a schedule for the review of this topical report.
Sincerely, M
'l Robert L. Baer, Chief e
Light Water Reactors Branch No. 2 Division of Project Management Enclosure :
Request for Additional Information t'
yOfi250060
ENCLOSURE EDERER TOPICAL REPORT EDR-1(P)
Additional information or clarification needed 1.
At what crane capacity does the emergency brake system become geared to the drum? How does a geared unit affect the Hoist Inte-grated Protective System (HIPS) function details?
2.
High reliance is placed on the HIPS system to place the crane in a safe holding position in case of a multitude of different distress signals. To what quality specification are the "off the shelf" component parts of the electronic control assembly (HIPS) procured?
3.
Fig. III.C.3.a.
The alternate dual load path design illustration is not readily interpretable. As shown the two attaching points are
" locked" against each other and the adjustment of wire rope lengths must be made by the equalizing assembly.
Figure III.C.3.e suggests a partial independence of the movement between the two reeving systems.
It is not clear how equations of motion in Apoendixes E and F would be affected by the latter intrepretation.
Comoliance with regulatory positions of R. G.1.104 1.
Regulatory position C.2.a.
Response is incomplete.
If the response is HIPS then indicate so.
2.
Regulatory cosition C.3.g.
Response incomplete.
Testing of components is mentioned but design factors should be prescribed for those parts of the system that would not be tested at 200% of design rated load.
. 2
- E ' " I?/9 3.
Regulatory position C.3.k.
The drum safety support shown in Figure III.D.4 is unacceptable because the drum can drop if the axle breaks and thus disengage the drive gear or the emergency brakes.
- Also, indicate if and how the support method applies to both ends of the drum.
4 Page B.3.
It can be construed that Item 15 refers to number of wire ropes that the load is divided between ? lease expand to clearly show how it is to be understood.
Accendix E 1.
Figures 1 through 9 illustrate the responses (displacement, tension, load, and system kinetic energy) for a drive train failure and a single rope failure. These responses are determined with the aid of the system equations of motion (EOM) derived in Sections 6 and 7; hcwever, there is no clear relationship between model and failure mechanism.
In addition, since there are initial values (Xo & V ) it e
is not clear that the displacement and kinetic energy at t=0 should be zero for the critical cases identified above.
Therefore, a description of the failure mechanism would be helpful in understanding what is happening (particularly to the drum and the load) during each of the failures.
2.
Page E.21 - Definition of N should be clarified, it is not clear that it indicates the number of ropes from the drum.
aru.t n1=
3.
Page E.22 - A description of the braking system and justification for the braking torque application (equation 5) should be provided.
4.
Page E.22 - Change numeral "2" to "N" in third term of equation (7).
5.
Page E.24
" Tackle Systems Efficiency" should be explained.
6.
Page E.25 - Parenthetical phrase in third line under Section 7 - The phrase appears to be a contradiction since for weak damping, the damped oscillation frequency would be on the same order as the undamped oscillation frequency.
Aopendix F 1.
Page F.4 - Because of the large differences in the values of effective mass moment of inertias for the cases considered in Appendix F, an explanation of the EATL operation using simplified sketches for the various regions would help in clarifying the analysis. Terms such 2
as " effective moment of inertia" and " lead line factor" should be defined.
2.
Page F.3, last sentence - This statement should not be included in this Appendix.
If an AC motor pcwered crane will be used it would be preferable to identify the differences in aspect of performance between AC and DC motor powered cranes and explain how the pertinent information would change.
3.
Page F.9 - Justification should be given for assuming the maximum torque factor of 2.75.
Editorial Changes in Appendix F 1.
Page F.2 - Be consistent and define positive drum rotation in clock-wise direction. Also, use same definitions as in Appendix E.
(N has now been replaced with P and P had an entirely different meaning in Appendix E).
2.
Page F.3 - It appears that the exponent of K in equation (1) should be a subscript.
3.
Page F.5 - Define F as the force in the rope.
4.
Page F.5 - The definition of "a"
in Appendix F is different frcm "a" in Appendix E.
Therefore, use a different constant to eliminate the confusion.
5.
Page F.7 - Eqtations (15) and (16) pertain to tension and not stress; therefore, change " stress" to tension" in first line at too of page.
6.
Page F.9 - Change "M" to "N" in the list. Also give the values for cable metal areas and elastic modulus.
7.
Page F.10 - Change " equation (4)" to " equation (10)" in the line preceding equation (10).
.