ML20064A280

Suppl to 900731 Application for Amends to Licenses NPF-72 & NPF-77 Changing Tech Spec 3.3.3.3 to Provide New Location of Free Field Seismic Monitor for Time History Accelerograph

ML20064A280
Person / Time
Site:	Braidwood
Issue date:	08/27/1990
From:	Hunsader S COMMONWEALTH EDISON CO.
To:	Murley T Office of Nuclear Reactor Regulation
References
NUDOCS 9008310015
Download: ML20064A280 (11)

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y1 1 Commonwealth Edison 1400 Opus Ptc)

I e 7 Downers Grove. Illinois 60515 August 27, 1990 Dr. Thomas E. Hurley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Nashington, DC 20555 Attn: Document Control Desk

Subject:

Braidwood Station Units 1 and 2 Supplement to the Application for Amendment to facility Operating Licenses NPF-72 and NPF-77 Appendix A, Technical Specifications MC_Qotte_tloL_50 .456_anL50.157 Reference (a): S.C. Hunsader letter to T.E. Hurley July 31, 1989

Dear Dr. Hurley:

In reference (a), pursuant to 10 CFR 50.90, Commonwealth Edison (Edison) proposed to amend Appendix A, technical Specifications, of facility Operating Licenses NPF-72 and NPF-77. The proposed amendment requested changes to Technical Specification 3.3.3.3 to provide a new location of the free field seismic monitor (accelerometer) for the time-history accelerograph. The current location of the monitor is 39 + 00E and 41 + 00S. The new location of the monitor is 38 + 01S and 34 4 15E. This relocation is being made due to the construction of a new Training Building in the area that includes the current monitor location.

On August 16, 1990 a telecrnference was held between Edison and the NRC staff. The NRC staff requested additional information regarding: 1) the total number of triaxial accelerometers, and 2) the uniformity of the soil under the new location for the free fleid accelsrometer. This information had been addressed in reference (al via reference to sections of the Byron /Braidwood UFSAR. However, this letter provides the requested information.

IoltLt!umher_of Triax1AU.itele. tome. ten As stated in reference (a), Braidwood Station has four triaxial accelerometers installed that are connected to the time-history accelerograph.

These individually measure the absolute acceleration as a function of time in three orthogonal directions. These accelerometers are installed at the following locations:

1. In the free field, previously at site coordinate 39+00E and 41+005, currently moved to site coordinate 38+01S and 34+15E, 2 on the containment building foundation slab at elevation 377 feet and azimuth 145 degrees, 3 on the containment shell wall at elevation 502 feet and azimuth 145 degrees. and

4. on the containment refueling floor at elevation 426 feet.

9008310015 900827 pf Q fDR ADOCK 0500 6 g pg @8 , ,

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i'Dr.*T.E.Murley - 2 - August 27, 1990 I

As described in UrSAR Section 3.7.4.2.4, a fifth seismic accelerometer is located in the auxiliary building counting room at the 426 elevation that is direct.. connected to the response spectrum analyzer.

Direct inputs for calculating response spectra (peak acceleration vs.-

frequency) are also provided by the accelerometers:

a. on the base slab of the containnant building, elevation 377 feet.

(accelerometer #2, described above) This location serves the dual purpose of panitoring the base slab response and the support motion of reactor equipment recorded from the accelerometer through the time-history accelerograph. The recorder is also equipped to provide signals in the control room area in the event preset acceleration ilmits are exceeded, (for the containment base mat location).

b. on the auxillary building floor, elevation 426 feet, in the counting room (accelerometer #5, described above).

The response spectrum analyzer determines the variation in the maximum response of a single degree-of-freedom system versus its natural frequency vibration when subjected to a time-history motion of its base. The response spectrum analyzer computes the response spectrum of the event, compares it to the design response spectra of the plant, and indicates whether the event exceeded the OBE or SSE criteria.

As stated in reference (a), using the spectrum analyzer, an operator can observe the triaxial spectral analysis from the containment building 377 feet elevation slab monitor and the aux 111ary building 426 feet elevation accelerometer. The operator can also use the playback feature of the system to obtain time history and spectral analysis of any of the recorded accelerometers (Accelerometers #'s 1, 2, 3 and 4).

As indicated in reference (a), a sixth seismic accelerometer is connected to a second time-history accelerograph at elevation 338 feet in the auxiliary bu11 ding on the column row 18 wall adjacent to the column line "L" wall in the essential service water pump room. This accelerograph is a self-contained unit independent of the other accelerograph. The response spectrum for this location can be determined using the playback unit and response spectrum analyzer.

Uniformi ty_oLitte_Soll UFSAR Section 2.5.4.3.2 states, in part, that thirty widely spaced geologic borings were drilled at the site from August 1972 to January 1973 by Soll Testing Services, Inc., under the supervision of Dames & Hoore. Sixty-nine additional borings were drilled at the plant area from January 1973 through March 1973 by Raymond International, Inc., under the supervision of Dames & Hoore. The soils were classified according to the Unified So11 Classification System described on UFSAR rigure 2.5-27. The site borings range in depth from 35.5 to 345.0 feet below the ground surface and were drilled at the locations shown on UFSAR Figure 2.5-16. The purpose of the borings was to obtain samples for the determination of the details of lithology, structure, and physical properties of the subsurface strata at the site. (The soll borings that represent both the old and new locations of the free field seismic accelerometer are listed in Table A.)

m- 1 1

1 i Dr. T.E. Hurley - 3 - . August 27, 1990 ,

r i' As stated in reference (a) the soll and subsurface conditions at Braidwood i' Station are relatively uniform. UFSAR Section 2.5.1.2.4.1 states overburden deposits _within the plant site area consist of eolian deposits, lacustrine deposits, outwash, and glacial till. Borings at the site vicinity encounteied soll i deposits which ranged in thickness from 26.0 feet in Boring MP-46 to 62.0 feet in Boring P-10. The average. soil thickness encountered in the site borings was '

approximately 42.0 feet. The sequence and nature of the soil and rort units within i the site area are shown in a composite stratigraphic column, UfSAR figure 2.5-19, in a fence diagram of the site area UFSAR figure 2.5-21, and in subsurface cross sections, UFSAR figures 2.5-23 through 2.5-26. (figures 2.5-23 and 2.5-24 ,

represent both the old and new locations of the free field seismic accelerometer).  !

The boring logs in the vicinitj of the old and new locations of the free  !

fleid seismic accelerometer show consistent overburden thickness and soll characteristics. No backf1111ng or placement of soil of a different type has beer,  !

added to the new location of the free field seismic accelerometer. Accordingly, no change in the soll condition has occurred since the time the soil borings were taken. .Thus, the response of the free field accelerometer to seismically induced ground motion will not be altered by its change in location.

Edison is notifying the State of Illinois of this supplement to an appilcation for amendment by transmitting a copy of this letter and its attachments to the designated State Official.

Please direct any questions you may have concerning this submittal to this office.

Very truly yours,

,dC d . A .

S.C. Hunsader Nuclear Licensing Administrator

Enclosures:

A. B/B UfSAR figures 2.5-16, Shts. 1 & 2 of 5 l figures 2.5-19 l figures 2.5-21 l figures 2.5-23 figures 2.5-24 figures 2.5-27 B) July 31, 1989 S.C. Hunsader letter to T.E. Murley 1

i cc: Resident Inspector-Braidwood S.P. Sands-NRR H. Shafer-Region Ill H.C. Parler-IDNS

/sc1:ID183:3

d JAblLA BRAIDH000 STATION UNITS 1 9 2 RELOCATION OF SEISMIC ACCELEROMETER OLD LOCATION NEN LOCATION i

39+00 E 3B+01 S 41+00 S 34+15 E BORING # LOCATION S0ll TYPE ELV FT ROCK ELV 50+00 S Al 31400 E SAND 575 555 A2 47400 S 33400 E SAND 575 555 H5 42400 S 37+00 E SAND 574 555 Af 38+00 S SAND 575 555 36+00 E A10 42400 S SAND 575 555 41+00 E A6 40+00 S SAND 575 555 41400 E AB 30+00 S SAND 575 555 41+00 E NOTE: THE GRADE IS APPROXIMATELY AT ELV, 600,00 FT.

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