ML20247N205

Proposed Tech Spec Table 3.3-7, Seismic Monitoring Instrumentation & Associated Bases 3/4.3.3.3,changing Free Field Location for time-history Response Spectrum Analyzer

ML20247N205
Person / Time
Site:	Braidwood
Issue date:	07/31/1989
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20247N191	List: ML20247N188 ML20247N205
References
NUDOCS 8908020327
Download: ML20247N205 (6)

Text

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TABLE 3.3-7 .

i SEISMIC MONITORING INSTRUMENTATION i

MINIMUM MEASUREMENT INSTRUMENTS  ;

INSTRUMENTS AND SENSOR LOCATIONS RANGE- OPERABLE ,

1 1.' Time - History Accelerographs ]

a. Aux. Elect. Rm, OPA02J N.A. 1

2. Triaxial Peak Accelerographs

a. Cont./ Reactor Eq. Accumulators -2 g to +2 g 1 4

b. Cont./ Reactor piping -2 g.to +2 g l'

c. Aux. Bldg./ Cat. I piping . - / g to +2 g 1 [i

3. Response-Spectrum Analyzer j Aux Elect Rm, OPA02J None 1- k,

4. Triaxial Acceleration Sensors

a. Cont./10W - 377' -2 g to +2 g 1

b. Cont /10W'- 502' -2 g to +2 g 1

c. C_ont./10X - 4_26'_ _ - - _ _ _ _ -2 g to +2 g 1

~

i g -

g + 1

f. Aux. Bldg./18L - 338' -2 g to +2 g _1 I

)l t i d. Free Fic I d [ 39 i- 015 j 3 4 + /SE 1 ,

i L i i-i a'

s 8900020327 DR 890731 p ADOCK 05000456 PNU BRAIDW10D - UNITS 1 & 2 3/4 3-45

~

INSTRUMENTATION q

BASES.

1 3/4.3.3.2 MOVABLE INCORE DETECTORS The OPERABILITY of the movable incore detectors with the specified minimum complement of equipment ensures that the measurements obtained from use of this system accurately represent the spatial neutron flux distribution of the i core. The OPERABILITY of this system is demonstrated by irradiating each detector used and determining the acceptability of its voltage curve. 4 ForthepurposeofmeasuringF(Z)orFhafullincorefluxmapisused.

q 3 Quarter-core flux maps, as defined in WCAP-8648, June 1976, may be used in '

recalibration of the Excore Neutron Flux Detection System, and full incore flux maps or symmetric incore thimbles may be used for monitoring the QUADRANT i POWER TILT RATIO when one Power Range channel is inoperable.

3/4.3.3.3 SEISMIC INSTRUMENTATION ,

The OPERABILITY of the seismic instrumentation ensures that sufficient capability is available to promptly determine the magnitude of a seismic event and evaluate the response of those features important to safety. 4, is required to permit comparison of the measured response to that used in theThis capability i

design basis for the facility to determine if plant shutdown is required.

pursuant to Appendi.x A of 10 CFR Part 100.

The instrumentation consists of one time-history response spectrum analyzer, a playback ometers.

unit, three peak recording accelerometers, and six triaxial acceler-The above-mentioned equipment, excluding the sensors, is located in the Auxiliary Electrical Room. The remaining sensors are located as follows: ,

three ia containme

( locatioTG'T _M.ntm two_in the Auxiliary Building, and one at the free field 31 " '00 G The peak recording accelerometers are passive devices which have no interplay on the rest of the system and are located on reactor equipment, reactor piping, and outside containment on the . Category I piping.

i The triaxial accelerometer is based on three orthogonal force-balanced servo-accelerometers which generate a voltage signal upon stimulation. The voltage signals are transmitted to the time-history recorder in the Auxiliary Electrical Room, digitized, and recorded on magnetic tape.

signals The time-histc,ry and system datarecorder interface.is the master control unit for all control timing lI It also contains the system triggers used to actuate the system. The master control unit continually monitors two of the )

sensor inputs, which to the system actuation level. are processed through the trigger circuits for comparison I to record both pre- and post seismic event data.The time-history recorder also has the abilit The other key component in the system is the response spectrum analyzer. This unit determines the variation in ,.

the maximum response of a single-degree-of-freedom system system versus its '

natural frequency of vibration when either of two designated triaxial accelero-meters is subjected to a time-history motion of the accelerometer.

3 B t 015, 3 'f + iS C BRAIDWOOD - UNITS 1 & 2 B 3/4 3-4

.t ENCLOEURES FOR .

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ERDEDSED_CilMiGES TO APPEND.IZ_A ,

s IECHNICAL SPECIFICATIONS Of 1 l

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