TS 3.5.3 ECCS - Operating Flashcards Preview

LOIT Tech Specs > TS 3.5.3 ECCS - Operating > Flashcards

Flashcards in TS 3.5.3 ECCS - Operating Deck (15)
Loading flashcards...
1
Q

LCO 3.5.3
2 ECCS trains shall be OPERABLE

APPLICABILITY: ___

A

MODES 1 and 2

MODE 3 with PZR pressure > 1837 psia or with RCS Tc > 485F

2
Q

The function of the ECCS is to provide core cooling and negative reactivity to ensure that the reactor core is protected after any of the following accidents:

a. ___
b. ___
c. ___
d. ___

A

a. LOCA
b. CEA ejection accident
c. Loss of secondary coolant accident, including uncontrolled steam release or loss of FW
d. SGTR

3
Q

The addition of negative reactivity is designed primarily for ___ because ___

A

…Loss of secondary coolant accident

…because primary cooldown could add enough positive reactivity to achieve criticality and return to significant power

4
Q

There are 2 phases of ECCS operation:
1 ___
2 ___

A
  1. Injection

2. Recirculation

5
Q

Each ECCS train consists of ___ and ___

A

HPSI and LPSI subsystems

6
Q

LCO 3.5.3 helps to ensure that the following acceptance criteria, established by 10 CFR 50.46 for ECCSs, will be met following a LOCA:

a. ___
b. ___
c. ___
d. ___
e. ___

A

a. Max fuel element cladding temperature is < 2200F
b. Max cladding oxidation < .17 times total thickness
c. Max H2 generation from a Zirconium water reaction is < .01 times hypothetical if all metal were to react
d. Core maintained in coolable geometry
e. Adequate long term cooling capability maintained

7
Q

LCO 3.5.3 also limits the potential for a post-trip return to power following a ___ and ensures that CTMT temp limits are met.

A

Steam Line Break (SLB)

8
Q

LCO 3.5.3 CONDITION

A. One LPSI subsystem inoperable.

A

A.1 Restore subsystem to OPERABLE status (7 days)

9
Q

The availability of at least ___% of the ECCS flow equivalent to a single OPERABLE ECCS train is implicit in the definition of Condition A.

A

100%

10
Q

LCO 3.5.3 CONDITION
B. 1 or more trains inoperable for reasons other than Condition A.
AND
At least 100% of the ECCS flow equivalent to a single OPERABLE ECCS train available.

A

B.1 Restore train(s) to OPERABLE status (72 hours)

11
Q

An ECCS train is inoperable if ___

A

…it is NOT capable of delivering the design flow to the RCS.

12
Q

The intent of this Condition is to maintain a combination of OPERABLE equipment such that ___

A

…100% of the ECCS flow equivalent to 100% of a single OPERABLE train remains available.

13
Q

LCO 3.5.3 CONDITION

C. Required Action and associated Completion Time not met.

A
C.1 Be in MODE 3 (6 hours)
AND
C.2 Reduce PZR pressure to < 1837# (12 hours)
AND
C.3 Reduce Tcold to < 485F (12 hours)
14
Q

Per SR 3.5.3.1, A valve that receives an actuation signal is allowed to be in a nonaccident position provided the valve auto repositions within ___

A

…the proper Stroke Time

15
Q

Per SR’s 3.5.3.4-6, the following valve actuations MUST be verified:
___

A

“on an actual or simulated RAS, the CTMT sump isolation valves open, and the HPSI, LPSI and CS minimum bypass recirculation flow line isolation valves and combined SI mini flow valve close.”