ML18030B148
| ML18030B148 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 02/24/1986 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML18030B147 | List: |
| References | |
| NUDOCS 8603030556 | |
| Download: ML18030B148 (2) | |
Text
w73.
There are four sensors per steam 1ine of which at least one sensor per trip system must be operable.
- 4. Only required in Run Mode (Interlocked with Mode Switch).
- 5. Not required in Run Mode (bypassed by mode switch).
6.
Channel shared by RPS and Primary Containment 6 Reactor Vessel Isolation Control Systems.
A channel failure may be a channel failure in each system.
7.
A train is considered a trip system.
8.
Two out of three SGTS trains required.
A failure of more than one will require action A and F.
9.
DELETED 10.
Refer to Table 3.7.A and its notes for a listing of Isolation Valve Groups and their initiating signals.
11.
A channel may be placed in an inoperable status for up to four hours for required surveillance without placing the trip system in the tripped condition provided at least one OPERABLE channel in the same trip system is monitoring that parameter.
12.
A channel contains four sensors, all of which must be operable for the channel to be operable.
Power operations permitted for up to 30 'days with 15 of the 16 temperature switches operable.
In the event that normal ventilation is unavailable in the main steam line tunnel, the high temperature channels may be bypassed for a period of not to exceed four hours.
During periods when normal ventilation is not available, such as during the performance of secondary containment leak rate tests, the control room indicators of the affected space temperatures shall be monitored for indications of small steam leaks.
In the event of rapid increases in temper-ature (indicative of steam line break), the operator shall prompt-ly close the main steam line isolation valves.
13.
The nominal setpoints for alarm and reactor trip (1.5 and 3.0 times background, respectively) are established based on the normal back-ground at full power.
The allowable setpoints for alarm and reactor trip are 1.2 - 1.8 and 2.4 - 3.6 times background, respectively.
14.
Requires two independent channels from each physical location, there are two locations.
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