ML17251A584

Proposed Tech Spec Table 3.14-1 Concerning Fire Detection Instruments for Computer Room

ML17251A584
Person / Time
Site:	Ginna
Issue date:	02/12/1986
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17251A581	List: ML17251A580 ML17251A582 ML17251A584
References
NUDOCS 8602190177
Download: ML17251A584 (8)

Text

Attachment A Revise the Technical Specification pages as follows:

Remove Insert 3.14-7 3.14-7 8602i90i77 8602i2 ADOCK 05000244'DR P PDR

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Table 3.14-1 FIRE DETECTION IhSTRUEKNTS Instnment Location Minimum Instruments rab] e***

Heat Smoke Containment "A" Post-Accident Charcoal Bank (Z09. Z10) 3* N/A "B" Post-Accident Charcoal Bank (Z11, Z12) 3* N/A "A" Aux. Filter Charcoal Bank (Z06) N/A "B" Aux. Filter Charcoal Bank (Z07) N/A Cable Trays Basement Elev. (Z08) 1** N/A Cable Trays Intermed. El'. (Z15) 2** N/A Cable Trays Operating Floor (Z16) 1%'* N/A "A" RCP Intermediate Floor (Z13) 1%'* N/A "B" RCP Intermediate Floor (Z14) 1%* N/A Area Detection Operating Floor (Z16) N/A 7

2. Control Roan Area and Cabinet (Z19) 1 17 Control Roan/Turb. Bldg. Wall (S29) 4 N/A

3. Relay Roan (Z18, S08) 16

4. Canputer Roan Ceiling (S07) N/A 3

5. Battery Roans (ASB) (Pyrotronics Zone 8) N/A Control Building Air Handling Roan (S06) N/A

7. Diesel Generator "A" Generator Roan (S12) 2 N/A "A" Generator Vault (Z20) N/A 1 nBn Generator Roan (S13) 2 N/A "B" Generator Vault (Z21) N/A 1

8. Intermediate Building Motor Driven Aux. Fd. Pump Area (Z22) N/A 9 Turb. Driven Aux. Fd. Pump 6 Res. (S14) 1 N/A Cable Trays Basement North (S15) N/A 14 "A" Purge Filter Elev. 315'-4" (Z23)

N/A 1 "B" Purge Filter Elev. 315-4" (Z24) N/A 1

9. Screen House Area Detection Serv. Water Pump and Bus Area (Z26) N/A 11 Cable Trays Basement (S17) N/A 4 3.14-7

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Attachment B Rochester Gas and Electric Corporation (RGGE) will install a new plant process computer system (PPCS) at Ginna in the Spring of 1986. The PPCS is necessary to support the new Safety Assessment System required by NUREG-0737. As a result of the PPCS installation, the existing computer room floor will be modified. The raised floor will be removed and wires for the computer will be relocated to a wire way under the new PPCS.

The current Technical Specifications specify two fire detection zones in the computer room, Zone S07 under the raised floor and zone Z17 at the ceiling. Currently Z17, the ceiling zone, is only used to actuate an alarm. The under-floor zone, S07, is used to actuate the Halon system. Modifications to the room to accommodate the PPCS will result in the Halon system being actuated by the ceiling zone. The under the raised floor detection zone will be removed along with the raised floor. The ceiling zone will be relabled (S07). Neither the amount of Halon injected nor the concentration will be affected by this modification. Since the Technical Specifications specify detection zones that will be modified a Specification change is required. The planned modification will not decrease the level of fire protection because detection and automatic actuation of Halon suppression will be retained.

Xn accordance with 10CFR 50.91, this change to Technical Specifications has been evaluated against three criteria 'to determine if the operation of the facility in accordance with the proposed amendment would:

1. involve a significant increase in the probability or sequences of an accident previously evaluated; or create the possibility of a new or different kind of I

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accident from any accident previously evaluated; or

3. involve a significant reduction in a margin of safety.

The modification changes the zone that actuates the Halon, does it it however, does not decrease the amount of Halon injected nor decrease the concentration of Halon in the room. The actuation will still be based on 2 out of 4 logic, therefore, the probability of failure remains unchanged. Since the concentration of Halon in the room is not decreased and the failure probability is unchanged the modification does not 'increase the probability or consequences of an accident.

Changing the Halon actuation zone does not create a new or different kind of accident than was previously evaluated because the change only involves changing the actuation from the floor to the ceiling.

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Since the EIalon concentration is not effected by the modification, and the level of fire protection is not changed there is no reduction in a margin of safety.

Therefore, a no significant hazards finding is warranted for the proposed change.

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