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Exams > 2019 Q42 — MSSV Setpoints and LCO 3.7.1.1 Bases

2019 Q42 — MSSV Setpoints and LCO 3.7.1.1 Bases

⚠️ DRAFT
Q42 — MSSV Setpoints and LCO 3.7.1.1 Bases G2.2.25 (3.2)
In accordance with Unit 2 LCO 3.7.1.1 (TURBINE CYCLE SAFETY VALVES), which ONE of the following completes the statements below?

The Main Steam Line Code Safety Valves will start to open when main steam line pressure FIRST exceeds _(1)_ psig.

The purpose of LCO 3.7.1.1 is to limit the secondary system pressure to within 110% of its design pressure _(2)_.
A. (1) 1100 (2) ONLY
B. (1) 1100 (2) and to protect against overpressurization of the Reactor Coolant Pressure boundary
C. (1) 1070 (2) ONLY
D. (1) 1070 (2) and to protect against overpressurization of the Reactor Coolant Pressure boundary
▶ Show Answer & Explanation
✓ D. Correct. For Part 1 and IAW LCO 3.7.1.1, the Main Steam Line Code Safety Valves will start to open when main steam line pressure FIRST exceeds 1070 psig. For Part 2 and IAW LCO 3.7.1.1, The purpose of LCO 3.7.1.1 is to limit the secondary system pressure to within 110% of its design pressure and to protect against overpressurization of the Reactor Coolant Pressure boundary.
✗ A. For Part 1, MSSVs have 5 different setpoints and 1100 psig is the second lowest setpoint for 21-24MS14s. For Part 2, the candidate could not recognize that the MSSVs also protect against overpressurization of the Reactor Coolant Pressure boundary.
✗ B. For Part 1, MSSVs have 5 different setpoints and 1100 psig is the second lowest setpoint for 21-24MS14s. Part 2 is correct.
✗ C. Part 1 is correct. For Part 2, the candidate could not recognize that the MSSVs also protect against overpressurization of the Reactor Coolant Pressure boundary.
Ref: Technical Specifications (LCO 3.7.1.1) | LO: NOS05MSTEAM-12 (MAIN STEAM SYSTEM) | Source: New | Cognitive: Lower

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