ML20040F669
| ML20040F669 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Limerick |
| Issue date: | 03/04/1971 |
| From: | Case E US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20040F238 | List: |
| References | |
| FOIA-81-385 NUDOCS 8202100069 | |
| Download: ML20040F669 (5) | |
Text
{{#Wiki_filter:. O o e; &y _w i w ) Q MAR 4 1971 2 s,m 5' C. 4% 7[d 75: Ib. ~ 34 w P. A. Morris, Director, Division of Reactor Licensing 3 p Y FHILADELPHIA ELECTRIC COMPANY - LIMERICL GENERATING STATION, UNITS NO. 1 & 2 DOCEET NOS. 50-35J]353 f*:): 5 A. Adequate responses to the enclosed list of additional information prepared _g by the Division of Reactor Standards will be required before we can complete j-our review of the subject application. gi }; These reques ts concern the material submitted in Supplement No. 3, answer Y 5.15, covering earthquake instrumentation. C7 4 gw o,.iginal signed by T.(
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Edson C. Case, Director N Division of Esactor Standards i; y-s
Enclosure:
DISTRIBUTION: M Additional Information Requests Suppl. Doc. No. 50-352E( CU h. Suppl. Doc. No. 30-353 ff ec w/ encl: DR R/F g S. E. Hanauer, DR DRS R/F -T. R. DeYoung DRL SEB R/F $) E. Boyd, DEL D. Skovholt. DEL } R. R. Maccary, DRS pf D. Enuth, DRL g. A. Dromerick, DRS G. Lear, DEL y G. Arndt, DES rj E. Wichman, DRS D. Lange, DRS A. Cluckmann, DRS F. Schauer, DES R. Shew =aker, DES i sl1** n CRESS omcr > HRS;SEB....,.. bRS.; S EB....... g
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A-O o 7 v.: 'z-k -3 < z. Ed ADDITIONAL IhTOPMTION REQUEST (y y. .T LIMERICK UNITS 1 & 2 gr DOCKET NOS. 50-352/353 ~$ T Seismic Instrumentation 4 On the basis of our evaluation of the seismic instrumentation system you -{ 5-have proposed, we have concluded that additional equipment and measures f E should be provided to assure the integrity and perf.rcance of structures, [Ft systems, and components important to safety under seismic disturbances. G H It is, therefore, requested that you provide further information and justi-Q 's fication for the selection, placement, and use of seismic instrumentation- [} to determine whether the plant can continue to be operated safely during E and af ter an earthquake which affects the plant. i r. The items listed below indicate the features and measures that we consider j N vould provide a suitable basis for a seismic instrumentation system and t b program to determine the seismic response of nuclear power plant features B important to safety and to permit comparison of such responses with those used as the design basis. If in developing your proposed syste= and pro-1 i gram parameters other than those listed below are used, such dif ferences j, 2 i should be documented and justified in your response. (, ?, l 1. At each nuclear power plant site, one strong notion triaxial accelero-2 ! graph in the basement of the reactor containnent structure and another i 1 \\ \\ l
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~, 2 l. strong motion triaxial accelerograph at a higher elevation of the E' rearrar.conenincent structure should be installed to provide data C 7 - A%he freqtiency, amplitude, and phase relationship of the seismic response of the containment structure and the seismic input for other g' 4 Category I structures, syste=s, and connonents. 'Q 2. The accelerographs should be: Separated from each other by a vertical distance which is a
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a. significant fraction of the containment building height, b. Oriented such that the three axes of the accelerograph sensors c p[ on one accelerocraph are pointing in the same directions as the three arc. of Ibe other accelerograph, [ c. Located such that one accelerograph is directly over the other, d. Located such that they are accessible for needed periodic servicing and recovery of the recorded traces following an earthquake, and e. Mounted rigidly to the containment structure or on a structure directly connected to the containment structure such that the accelerograph records can be related to contiinment structure movement. 0 L~ 3. Other instrumentation, such as peak recording accelerographs and p. 6 peak deflection recorders, should be installed on other selected [f' f. + ~
_Y-O o ? ?. r-Q: I ce.; z% %j; Category I structures, systems, and components to. verify the seistic 7,4 l -u 3 i w.. Tesponse setermined analytically from the traces recorded by the Q p. strong motion accelerographs. k-4 If another Category I structure, or a structure which contains Cate-1lQ ji gory I systems or components has a foundation independent from those 1 of the reactor containment and is expected to have a significantly l7'i different response due to different underlying soil conditions or Q v unique structural dynamic characteristics, instrienentation should [ + 2 also be provided to determine the seiscic response of the Category I p, j.% structure and the Category I equipment within the structure. 9% 5. Vnere more detailed knowledge of soil structure interactions is N ..e important to an accurate assessment of potential damage to Category I 4 ttructures, systems, or components, a free field accelerograph should J-E also be installed. { m 6. The value of the peak acceleration level (the neasurement eade may ? M e' be frequency dependent) experienced in the basement of the reactor ~ A containment structure should be indicated in the control roo= or N i available to the control roo= operator within a few minutes af ter an carthquake. The indication of the peak acceleration level may be in E the form of traces recorded by the accelerograph, either by direct j readout or by quick playback of the recorded signals, a cultilevel E acceleration readout which indicates when predetermined values have ^/a been exceeded, or some other suitable means. s 9 ? x( 2 M( k
=.- - - m rw - -, -- g -- 26 av.s 7.9 'g2 ig 's-4h, $n s.-. U 7. The instrumentation should be designed to perform-its function satis- "?L] factorily over the appropriate range of environmental conditions, such uw .:f* as teeperature, hu=idity, pressure, and vibration. q 'M TM 8. A plan for ticely utilization of the data to be obtained from the =U. h.R installed seismic instrumentation should be developed.
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