ML050310360
| ML050310360 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 01/27/2005 |
| From: | NRC/NRR/DLPM |
| To: | |
| SHea J, 415-1388, NRR/DLPM | |
| References | |
| TAC MC4504, TAC MC4505 | |
| Download: ML050310360 (2) | |
Text
ESFAS Instrumentation 3.3.2 Table 3.3.2-1 (page 3 of 5)
Engineered Safety Feature Actuation System Instrumentation APPLICABLE MODES OR OTHER NOMINAL SPECIFIED REQUIRED SURVEILLANCE ALLOWABLE TRIP FUNCTION CONDITIONS CHANNELS CONDITIONS REQUIREMENTS VALUE SETPOINT
- 4.
Steam Line Isolation (continued)
(2) Negative Rate - High 3(b)(c) 3 per steam line D
SR 3.3.2.1 SR 3.3.2.5 SR 3.3.2.8 SR 3.3.2.9
< 120(d) psi 100(d) psi
- 5.
Turbine Trip and Feedwater Isolation
- a.
Turbine Trip (1) Automatic Actuation Logic and Actuation Relays (2) SGWater Level-High High (P-1 4) 1,2 1,2 2 trains 3 per SG I
SR 3.3.2.2 SR 3.3.2.4 SR 3.3.2.6 J
SR 3.3.2.1 SR 3.3.2.2 SR 3.3.2.4 SR 3.3.2.5 SR 3.3.2.6 SR 3.3.2.8 SR 3.3.2.9 NA
< 85.6%
NA 83.9%
(3) Safety Refer to Function 1 (Safety Inlectlon) for all Initiation functions and requirements. See Item Injection 5.a.(1) for Applicable MODES.
- b.
Feedwater Isolation (1) Automatic Actuation Logic and Actuation Relays (2) SGWater Level-High High (P-14) 1,2 (e), 3(e) 1,2 (e), 3(e) 2 trains 3 per SG H
SR 3.3.2.2 SR 3.3.2.4 SR 3.3.2.6 D
SR 3.3.2.1 SR 3.3.2.2 SR 3.3.2.4 SR 3.3.2.5 SR 3.3.2.6 SR 3.3.2.8 SR 3.3.2.9 NA
< 85.6 NA 83.9%
(continued)
(b)
Except when all MSIVs are closed and de-activated.
(c)
Trip function automatically blocked above P-11 (Pressurizer Pressure) Interlock and may be blocked below P-i1 when Steam Line Isolation Steam Line Pressure-Low Is not blocked.
(d)
Time constant utilized In the rate/lag controller Is > 50 seconds.
(e)
Except when all MFIVs, MFCVs, and associated bypass valves are closed and de-activated or Isolated by a closed manual valve.
McGuire Units 1 and 2 3.3.2-12 Amendment Nos. 224 and 206
ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Steam Line Pressure-Low Function must be OPERABLE in MODES 1, 2, and 3 (above P-1 1), with any main steam valve open, when a secondary side break or stuck open valve could result in the rapid depressurization of the steam lines. This signal may be manually blocked by the operator below the P-11 setpoint. Below P-1 1, an inside containment SLB will be terminated by automatic actuation via Containment Pressure-High High. Stuck valve transients and outside containment SLBs will be terminated by the Steam Line Pressure-Negative Rate-High signal for Steam Line Isolation below P-i1 when Steam Line Isolation Steam Line Pressure-Low has been manually blocked. The Steam Line Isolation Function is required in MODES 2 and 3 unless all MSIVs are closed and de-activated. This Function is not required to be OPERABLE in MODES 4, 5, and 6 because there is insufficient energy in the secondary side of the unit to have an accident.
(2)
Steam Line Pressure-Negative Rate-High Steam Line Pressure-Negative Rate-High provides closure of the MSIVs for an SLB when less than the P-1 1 setpoint, to maintain at least one unfaulted SG as a heat sink for the reactor, and to limit the mass and energy release to containment. When the operator manually blocks the Steam Line Pressure-Low main steam isolation signal when less than the P-1 1 setpoint, the Steam Line Pressure-Negative Rate-High signal is automatically enabled. Steam Line Pressure-Negative Rate-High provides no input to any control functions.
Thus, three OPERABLE channels are sufficient to satisfy requirements with a two-out-of-three logic on each steam line.
Steam Line Pressure-Negative Rate-High must be OPERABLE in MODE 3 when less than the P-11 setpoint, when a secondary side break or stuck open valve could result in the rapid depressurization of the steam line(s). In MODES I and 2, and in MODE 3, when above the P-1I setpoint, this signal is automatically disabled and the Steam Line Pressure-Low signal is automatically enabled. The Steam Line Isolation Function is required to be OPERABLE in McGuire Units 1 and 2 B 3.3.2-1 7 Revision No. 62