ML19289D110
| ML19289D110 | |
| Person / Time | |
|---|---|
| Site: | Vallecitos File:GEH Hitachi icon.png |
| Issue date: | 01/22/1979 |
| From: | Darmitzel R GENERAL ELECTRIC CO. |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7901290245 | |
| Download: ML19289D110 (3) | |
Text
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GEN ER AL h ELECTRIC
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ENGINEERING GENERAL ELECTRIC COMPANY. P.O. BOX 460, PLEASANTON, CALIFORNIA 94566 DIVISION January 22, 1979 Mr. Victor Stello, Director Division Of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D.C.
20555
SUBJECT:
RESUMPTION OF OPERATION OF THE GENERAL ELECTRIC TEST REACTOR (GETR), Docket 50-70
Dear Mr. Stello:
This letter amplifies and clarifies the description of the two redun-dant control units being added to the existing seismic scram system as described in the " Updated Response to NRC Order to Show Cause, dated 10-24-77", Appendix 6.
This information is provided to facili-tate the safety evaluation of the modifications.
The control units are designed to actuate the Fuel Flooding System (FFS),
the emergency cooling system, and certain pressurizer valves in the event of a trip signal from the reactor seismic trip system. They are designed to lock themselves in the trip condition until they are individually manually reset.
The assembled control unit was seismically tested by Scientific Service, Inc. of Redwood City, California, and sumarized as follows: A control unit was subjected to a vibration qualification test and then a vibration fragility test.
The qualification test subjected the control unit to a minimum of 1.759 in a continuous sinusoidal vibration sweep from 1 to 33 Hz at a rate not greater than 2 octaves per minute in each of the three axes. The fragility test consisted of vibrating the unit by conducting frequency scans in each of the three axes from 1 to 33 Hz in 1/3 octave intervals increasing the acceleration amplitude after each scan and maintaining the vibration at each 1/3 octave frequency for. 20 seconds until a control unit malfunction occurs or the vibration lQ-
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GENER AL h ELECTRIC Mr. Victor Stello January 22, 1979 generation equipment limit is reached. The limit of the vibration generation equipment varied with frequency having a maximum accelera-tion of 10g at 33 Hz. No malfunction of the control unit occurred during these tests or was evident af+.er the tests. These units are therefore qualified for this application.
Sincerely, 9s,.c/,
R. W. Darmitzel, Manager Irradiation Processing Operation cc:
E. A. Firestone Mr. Matt Chiramel Dr. Harry Foreman, Member U.S. Nuclear Regulatory Atomic Safety & Licensing Board Panel Commission Box 3950, Mays Washington, D.C.,
20555 University of Minnesota Minneapolis, Minnesota 55455 Mr. Chris Nelson Gustave A. Linenberger, Member U.S. Nuclear Regulatory Atomic Safety & Licensing Board Panel U.S. Nuclear Regulatory Commission W
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, D.C., 20555 Washington, D.C., 20555 Nuclear Regulatory Comission Mr. Edward Luton, Member Region V Atomic Safety & Licensing Board Panel Suite 202, Walnut Creek Plaza U.S. Nuclear Regulatory Comission 1990 h. California Boulevard Washington, D.C., 20555 Walnut Creek, California 94596 G. L. Edgar, Esq.
Morgan, Lewis & Bockius 1800 M Street, N.W.
Washington, D.C., 20036 Friends of the Earth 124 Spear Street San Francisco, California 94105
,{7 Attn:
W. Andrew Baldwin OFFICIAL 'e-ve
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Congressman Ronald Dellums
~{t;ng.~ w M, munncaos.y Representative - 7th District
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Oakland, California 94604 Attn: Ms. Nancy Snow
O GENER AL h ELECTRIC AFFIRMATION The General Electric C& pany hereby submits an amplification and clarification of the.escription of the two redundant control units being added to the existing seismic scram system as described in the " Updated Response to NRC Order to Show Cause, dated 10-24-77",
Appendix 6.
To the best of my knowledge and belief, the information contained herein is accurate.
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By:
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R. W. Darmitzel, Manager lP~{f3 7
Irradiation Processing Operation OFRC AL yy
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Submitted and sworn before me this 22nd day of January,1979.
7/uso.- O banau
, Notary Public in and for the County of Aladeda, State o/ California.
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