ML19253B742
| ML19253B742 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/23/1972 |
| From: | Maccary R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7910180726 | |
| Download: ML19253B742 (3) | |
Text
AIAY 2 31972 Richard C. DeYoung, Assistant Director for PWR's, Directorate of Licensing TL7REE MILE ISLAND NUCLEAR PIRIT, UNIT 1. DOCKET No. 50-289 Adequate response to the enclosed request for additional information are r~uired before we can complete our review of the subject application.
"Tais request, prepared by the L Mechanical Engineering Branch, concerns inadequate response submitted in Amendment 26 of the FSAR to L questions dated :tarch 22, 1972, regarding B & W topical report " Qualification Testing of Protection System Instrunentation (BAW 10003, March 1971)."
The information requested is applicable to the Three Mile Island application as well as all other B & W applications on a generic basis.
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R. R. Maccary, Assistant. Director for Ructor Safety Directorate of Licensing cc w/encis E. J. Bloch, DDR S. H. Uanauer, DRTA J. M. Hendrie, L F. Schroeder, L C. G. Long, L D. F. Ross, L V. A. Moore, L D. F. Lange, L S. N. Hou, L cc v/o encl:
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Form AEC-51, t Rev. 9-53) AECM 0240
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EVALUATION OF SEISMIC TESTIhG
" QUALIFICATION TESTING OF PRCTECTION SYSTEM INSTRUMENTATION" B & W TOPICAL REPORT, BAW 10003, MARCH 1971 1.
The response to question 7.14(a) requires clarification. Though as stated in your response "the formula on page 6-5 of BAW-10003 was derived from formula 2.28(a) in ' Mechanical Vibration' by J. P.
Den Eartog Fourth Edition (1956), by assuming w = "n", the f emula application is restricted to a damped single degree-of-freedom system.
Since the qualification testing of instruments already incorporates damping, either delete all reference to damping from the topical report BAW-10003, or provide justification that all tested modules and cabinets are single degree-of-freedom systems.
2.
The response to question 7.14(d) requires the following clarification.
(a) Since 40 Hz is the testing frequency range intended by B & W for qualifying the modules, verify your intention to extend the testing frequency range of the cabinets to 40 Hz, or up to at least the 33 Hz recommended by IEEE Sta. 344, 1,971.
(b) The module response need not be measured in the exploratory testing of cabinets, but should be measured during the seismic vibration testing to verify that the accelerations at the module locations are less than the levels required for qualifying the modules. Provide a comparison su= mary of the module qualification accelerations and associated seismic cabinets response accelerations.
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(c) Provide a description of the procedure that was used to verify the vertical rigidity of cabinets. In the event that cabinet resonance frequencies occur within the testing frequency range provide a description of the seismic vibration testing that will be conducted in the vertical direction.
0 1445 189