Q96 — SR 4.0.3 Missed Surveillance Delay
G2.2.25 (4.2)
Given:
• Unit 2 is at 100% power and stable
At time 13:00:00 on November 21st
• It was discovered that SR 4.5.2.b.2 (Verify that ECCS Piping Is Full Of Water) was last performed on October 11th at 13:00:00
• SR 4.5.2.b.2 has a MONTHLY Surveillance Frequency
In accordance with Technical Specifications, which ONE of the following completes the statement below?
Assuming ALL other administrative requirements have been met, at 13:00:00 is the LATEST time/date that SR 4.5.2.b.2 can be performed without having to perform the applicable REQUIRED ACTION(s) of LCO 3.5.2 (ECCS SUBSYSTEMS - TAVG ≥ 350 °F).
• Unit 2 is at 100% power and stable
At time 13:00:00 on November 21st
• It was discovered that SR 4.5.2.b.2 (Verify that ECCS Piping Is Full Of Water) was last performed on October 11th at 13:00:00
• SR 4.5.2.b.2 has a MONTHLY Surveillance Frequency
In accordance with Technical Specifications, which ONE of the following completes the statement below?
Assuming ALL other administrative requirements have been met, at 13:00:00 is the LATEST time/date that SR 4.5.2.b.2 can be performed without having to perform the applicable REQUIRED ACTION(s) of LCO 3.5.2 (ECCS SUBSYSTEMS - TAVG ≥ 350 °F).
A. November 22nd
B. December 21st
C. December 22nd
D. December 29th
▶ Show Answer & Explanation
✓ C. Correct. SR 4.0.3 allows a delay time of 24 hours OR up to the limit of the specified frequency, whichever is greatest. Since the specified frequency is MONTHLY (every 31 days), then November 21st + 31 days = December 22nd. A risk assessment also needs to be performed for delay periods greater than 24 hours. Consequently, assuming ALL other administrative requirements have been met, December 22nd at 13:00:00 is the LATEST time/date that SR 4.5.2.b.2 can be performed without having to perform the applicable REQUIRED ACTION(S) of LCO 3.5.2 (ECCS SUBSYSTEMS - TAVG ≥ 350 °F).
✗ A. Incorrect but plausible. November 22nd is the date if the candidate incorrectly deduces that SR 4.0.3 allows a delay time of 24 hours OR up to the limit of the specified frequency, whichever is LEAST. November 21st + 24 hours = November 22nd.
✗ B. Incorrect but plausible. December 21st is the date if the candidate incorrectly assumes a MONTH frequency = 30 days (November 21st + 30 days = December 21st).
✗ D. Incorrect but plausible. December 29th is the date if the candidate incorrectly deduces that SR 4.0.3 also allows a 25% extension to the specified frequency (as defined in SR 4.0.2). November 21st + 31 days + 7 days (25% of 31 days) = December 29th.
Ref: SR 4.0.2, LCO 3.5.2 | LO: NOS05TECHSPEC-12 Obj 13 | Source: Bank | Cognitive: Higher | SRO Only: Application of generic LCO requirements (SR 4.0.1 through 4.0.4) and knowledge of TS bases
Connections
- Related tech specs: TS 3/4.0 — Applicability, TS 3/4.5 — ECCS
- Related exam: 2018 NRC Written Exam