Q76 — EOP-FRCI-3 PZR Vapor Space LOCA
APE: 008 PZR Vapor Space Accident-AA2.29 (4.2)
Given:
• A Reactor Trip and Safety Injection have occurred due to a PZR Vapor Space LOCA
• There are indications that a bubble has formed in the Reactor Vessel
• The crew has just transitioned to 1-EOP-FRCI-3 (Response To Void In Reactor Vessel) from 1-EOP-LOCA-1 (Loss Of Reactor Coolant)
Which ONE of the following completes the statements below?
During a PZR Vapor Space LOCA, PZR level _(1)_ a valid indication of RCS inventory.
In accordance with 1-EOP-FRCI-3, the crew will _(2)_.
• A Reactor Trip and Safety Injection have occurred due to a PZR Vapor Space LOCA
• There are indications that a bubble has formed in the Reactor Vessel
• The crew has just transitioned to 1-EOP-FRCI-3 (Response To Void In Reactor Vessel) from 1-EOP-LOCA-1 (Loss Of Reactor Coolant)
Which ONE of the following completes the statements below?
During a PZR Vapor Space LOCA, PZR level _(1)_ a valid indication of RCS inventory.
In accordance with 1-EOP-FRCI-3, the crew will _(2)_.
A. _(1)_ is _(2)_ ensure normal Charging Flow has been established
B. _(1)_ is _(2)_ Return To 1-EOP-LOCA-1
C. _(1)_ is NOT _(2)_ ensure normal Charging Flow has been established
D. _(1)_ is NOT _(2)_ Return To 1-EOP-LOCA-1
▶ Show Answer & Explanation
✓ D. Correct. For Part 1 and per the WOG Transient and Accident Analysis documentation, during a PZR Vapor Space LOCA, PZR level is NOT a valid indication of RCS inventory. For Part 2 and IAW 1-EOP-FRCI-3 Step 2, since BOTH SI Pumps are running (Safety Injection has occurred), then the crew will immediately return to procedure in effect (1-EOP-LOCA-1).
✗ A. For Part 1, the WOG Transient and Accident Analysis documentation states that during all other LOCAs, PZR level is a valid indication of RCS inventory. Consequently, the candidate could incorrectly conclude that during a PZR Vapor Space LOCA, PZR level is also a valid indication of RCS inventory. For Part 2, establishing normal flow is the first step of 1-EOP-FRCI-3 in which components are realigned (Step 3). Consequently, if the candidate fails to recognize the transition out of 1-EOP-FRCI-3 at Step 2, the candidate would incorrectly conclude that establishing normal charging is the proper action given the plant conditions.
✗ B. For Part 1, the WOG Transient and Accident Analysis documentation states that during all other LOCAs, PZR level is a valid indication of RCS inventory. Consequently, the candidate could incorrectly conclude that during a PZR Vapor Space LOCA, PZR level is also a valid indication of RCS inventory. Part 2 is correct.
✗ C. Part 1 is correct. For Part 2, establishing normal flow is the first step of 1-EOP-FRCI-3 in which components are realigned (Step 3). Consequently, if the candidate fails to recognize the transition out of 1-EOP-FRCI-3 at Step 2, the candidate would incorrectly conclude that establishing normal charging is the proper action given the plant conditions.
Ref: NOS05TAA007-00 (LOSS OF COOLANT ACCIDENTS), 1-EOP-LOCA-1, 1-EOP-FRCI-3 | LO: NOS05TAA007-00 & NOS05FRCI00-04 | Source: New | Cognitive: Higher
Connections
- Related systems: Pressurizer & PRT, RCS, ECCS
- Related EOPs: EOP-FRCI-3 — Response to Void in Reactor Vessel, EOP-LOCA-1 — Loss of Reactor or Secondary Coolant
- Related exam: 2018 NRC Written Exam