ML20079P899

Proposed Tech Specs Table 3.3-7, Seismic Monitoring Instrumentation

ML20079P899
Person / Time
Site:	North Anna
Issue date:	11/07/1991
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20079P896	List: ML20079P892 ML20079P899
References
NUDOCS 9111140146
Download: ML20079P899 (4)

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Attachment 2 1

Proposed Technical Specification Change ,

North- Anna Unit 1 .

Virginia Electric and- Power Company v

911'1140.146 911107 PDR ADOCK 05000338 P PDR ,

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i TABLE 3.3-7 SEISMtQ.hiONITORiNG lt1STRUMENTATIQR MINIMLIM ME6$1) ENT INSTRUMENTS INSTRUMENT AND SENSOR LOCATIONS

1. Triaxial Time-History Accelerographs

a. Containment Mat' 0 - 1.0 g 1

b. Containment Operating Level

• O - 1.0 g 1

2. Triaxial Peak Accelerographs

a. RHR Heat Excahnger 0 - 5.0 g 1

b. Safety injection pipe 0-5.0g 1

c. Component Cooling Heat Exchanger 0-5.0g 1

3. Triaxial Seismic Switches

a. Containment Mat

• NA NA ,

9

4. Triaxial Response-Spectrum Recorders

a. Containment Mat

• 2 - 25.4 Hz 1

b. Auxiliary Building Mat 2 - 25.4 Hz 1

c. RHR Pipe Support 2 - 25.4 Hz 1

d. CC Heat Exchanger Support 2 - 25.4 Hz 1

• With Control Room indication NORTH ANNA - UNIT 1 3/4 3 41 Amendment No. 80

Attachment 3 10 CFR 50.92, No Significant Hazards Consideration North Anna Unit 1 Virginia Electric and Power Company

10 CFR 50.92 Significant Hazards Considerations Analysis The proposed changes to Technical Specification 3.3.3.3, Table 3.3 7, items 4a.

4b,4c, and 4d have oeen reviewed against the criteria of 10 CFR 50.92 and been determined that the proposed changes do not involve a significant hazards consideration. Specifically, the changes are being made to reflect the range of the instrumentation originally installed in the plant and excepted from Regulatory Guide 1.12, Revision 1, dated April 1974, as noted in Section 3A.12 of the UFSAR.

1. Accident Probability or Consequence increase. There is not a significarit increase in the probability of occurrence or consequences of any accident or malfunction of equipment which is important to safety and which has been evaluated in the UFSAR. No modifications have been made to the installed instrumentation. The proposed amendment is subm;tted to reflect the range of the installed equipment as noted in Section 3A.12 of the UFSAR. The availability and reliability of the four triaxial response spectrum recorders will remain the same. Thsrefore, the proposed changes will not increase the probability or consequences of an accident previously evaluated.

Likewise, the consequences of the accidents will not increase as a result of the proposed Technical Specifimtion changes.

2. Accident Probability Creation. The changes do not create the possibility of a new or different kir.d of accident from those previously evaluated in the safety analysis report. No modifications have been made to the installed instrumentation or accident analysis as a result of this proposed amendment. The proposed amendment is submitted to reflect the range of the installed equipment as noted in Section 3A.12 of the UFSAR. Therefore, the proposed changes will not create the possibility of a new or different kind of accidont than any previously evaluated.

3. Safety Margin Reduction. The proposed changes do not involve a significant reduction in the margin of safety. No- physical plant modifications, changes in plant operations, or chan;;9s in accident analysis assumptions are being made. The proposed a~endment is submitted to reflect the range of the installed equipment le noted in Section 3A.12 of the UFSAR. Therefore, the acciderit analysis assumptions terrain bounding and safety margins remain unchanged.

Based on the above significant hazards consideration evaluation, Virginia Electric and Power Company concludes that the activities associated with this proposed Technical Specification change satisfies the no significtint hazards consideration standards of 10 CFR 50.92(c) and, accordingly, a no significant hazards consideration finding is justified.

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