ML050310360

Tech Spec Pages for Amendments 224 and 206, Safety Injection Steam Line Pressure-Low Function

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 3 (b)(c) 3 per steam D SR 3.3.2.1 < 120(d) psi 100 (d) psi Rate - High line SR 3.3.2.5 SR 3.3.2.8 SR 3.3.2.9

5. Turbine Trip and Feedwater Isolation

a. Turbine Trip (1) Automatic 1,2 2 trains I SR 3.3.2.2 NA NA Actuation SR 3.3.2.4 Logic and SR 3.3.2.6 Actuation Relays (2) SGWater 1,2 3 per SG J SR 3.3.2.1 < 85.6% 83.9%

Level-High SR 3.3.2.2 High (P-1 4) 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 (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 1 ,2 (e), 3 (e) 2 trains H SR 3.3.2.2 NA NA Actuation SR 3.3.2.4 Logic and SR 3.3.2.6 Actuation Relays (2) SGWater 1 ,2 (e), 3 (e) 3 per SG D SR 3.3.2.1 < 85.6 83.9%

Level-High SR 3.3.2.2 High (P-14) 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 (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