ML18037A530
| ML18037A530 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/26/1993 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML18037A529 | List: |
| References | |
| IEB-93-003, IEB-93-3, NUDOCS 9311030227 | |
| Download: ML18037A530 (5) | |
Text
ENCLOSURE Tennessee Valley Authority Browns Ferry Nuclear Plant (BFN)
Revised Pro osed Tem orar Technical S ecification Chan e
93ii030227 931026 PDR ADOCK 05000260 P,
ry
TABLE 3.2.B INSTRUMENTATION THAT INITIATES OR CONTROLS THE CORE AND CONTAINHENT COOLING SYSTEHS Hinimum No.
Operable Per
~Tri
~sl
'k2 2(16) 1(16)
Function Instrument Channel Reactor Low Water Level (LIS-3-58A-D)
Instrument Channel-Reactor Low Mater Level (LIS-3-58A-D)
Instrument Channel Reactor Low Mater Level (LS-3-58A-D)
Instrument Channel Reactor Low Mater Level (LS-3-58A-D)
Instrument Channel Reactor Low Mater Level Permissive (LIS-3-184, 185)
Tri Level Settin
> 470" above vessel zero.
> 470" above vessel zero.
> 398" above vessel zero.
> 398" above vessel zero.
> 544" above vessel zero.
Action A
Remarks Below trip setting initiates HPCI.
Hultiplier relays initiate RCIC.
Below trip setting initiates CSS.
Hultiplier relays initiate LPCI.
Hultiplier relay from CSS initiates accident signal (15).
Below trip settings in conjunction with drywell high pressure, low water level permissive, ADS timer timed out and CSS or RHR pump running, initiates ADS.
Below trip settings, in conjunction with low reactor water level permissive, ADS timer timed out, ADS high drywell pressure bypass timer timed out, CSS or RHR pump running, initiates ADS.
Below trip setting permissive for initiating signals on ADS.
Instrument Channel Reactor Low Mater Level (LIS-3-52 and LIS-3-62A)
> 312 5/16" above vessel zero.
A (2/3 core height)
Below trip setting prevents inadvertent operation of containment spray during accident condition.
'Only one trip system will be required to be OPERABLE during the period that the Reactor Vessel water level instrumentation modification requested by NRC Bulletin 93O3 is being performed, provided that the reactor is in the COLD SHUTDOWN CONDITION.
Hanual and automatic initiating capability of CSS and LPCI will be available.
but with a reduced number of instrument channels.
C
ENCLOSURE 2
Tennessee Valley Authority Browns Ferry Nuclear Plant (BFN)
Summar of Commitments TVA will implement the following compensatory actions during the period when proposed Temporary Technical Specification 343T is in effect:
1)
The plant will be in a cold shutdown condition with the primary system temperature at less than 212 degrees fahrenheit.
- 2) While in a cold shutdown condition, the reactor vessel will be vented through the reactor vessel head vent and the reactor vessel will be at atmospheric pressure.
- 3) Any refueling operations, core alterations, or other activities with the potential to drain the reactor vessel will be suspended.
4)
The reactor vessel water level instrumentation associated with the reference leg not being modified will be operable prior to removing the other reference leg from service.
5)
The remaining reactor vessel water level instrumentation not affected by the removal of a reference leg from service will be operable.
- 6) Operators will receive special training to ensure that they are fully cognizant of the instruments which will be out of service and the degraded automatic response capability of the plant.
7)
An operator aid will be posted on the control room panels to identify the instruments which will be out of service and the degraded automatic response capability of the plant.