Term
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Definition
| The specific activity of the reactor coolant shall be within the following limits: a. Dose Equivalent I-131 specific activity = 1.0 µCi/gm; b. Gross specific activity = 100/E µCi/gm. APPLICABILITY: MODES 1 and 2, />MODE 3 with RCS average temperature (Tavg) = 500°F. |
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Term
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Definition
(DNB) Limits LCO 3.4.1 RCS DNB parameters for pressurizer pressure, RCS average
temperature (Tavg), and RCS total flow rate shall be within the limits specified below:
a. Pressurizer pressure within the limit specified in the
COLR;
b. RCS average temperature (Tavg) within the limit specified
in the COLR; and
c. RCS total flow rate ³ 380,900 gpm and within the limit
specified in the COLR.
----------------------------NOTE----------------------------
Pressurizer pressure limit does not apply during:
a. THERMAL POWER ramp > 5% RTP per minute; or
b. THERMAL POWER step > 10% RTP.
------------------------------------------------------------ |
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Term
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Definition
| COLR for 3.4.1 BOTH UNITS SAME NUMBERS 2.12.1 the pressurzier pressure shall be greater than or equal to 2209psig 2.12.2 the rcs tave shall be less that or equal to 593.1F 2.12.3 the rcs total flow rate shall be greater than 386000gpm. |
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Term
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Definition
| 3.4.2 RCS Minimum Temperature for Criticality LCO 3.4.2 Each RCS loop average temperature (Tavg) shall be ³ 550°F. APPLICABILITY: MODE 1, MODE 2 with keff ³ 1.0. A. Tavg in one or more RCS loops not within limit. A.1 Be in MODE 2 with keff < 1.0. 30 minutes |
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Term
| WHAT IS THE PURPOSE OF THE 125VDC DISTRIBUTION SYSTEM |
|
Definition
Supplies 125VDC for each division to supply control power to:
Reactor trip switchgear
Main Control Board (MCB) ESF sections
ESF switchgear control systems
Other safety-related systems requiring DC power |
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Term
3.8.1 AC Sources – Operating
(Applicable in Modes 1-4) |
|
Definition
a) 1 qualified circuit inoperable - SR in 1 hour & 8 hours thereafter Restore in 72 hours
b) 1 DG inoperable – SR in 1 hour & 8 hours thereafter Restore in 14 Days
c) 2 Qualified circuits inoperable – Restore 1 in 24 hours
d) 1 DG inoperable & 1 or 2 circuits inoperable – Restore circuit(s) or DG in 12 hours
e) 2 DGs inoperable – Restore 1 DG in 2 hours
f) Action times not met – Mode 3 in 6 hours, Mode 5 in 36 hours
g) 2 DGs inoperable & 1 or more circuits inoperable – Enter LCO 3.0.3 |
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Term
| 3.8.2 AC Sources – Shutdown |
|
Definition
a) 1 Qualified circuit inoperable
Or
b) 1 DG inoperable 1) Declare inoperable
Or
2) Suspend core alterations
3) Suspend fuel moves
4) No positive reactivity changes
5) Restore immediately
6) Declare Low Temperature Overpressure Protection (LTOP) inoperable |
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Term
3.8.3 Diesel Fuel Oil
(Applicable when DG required to be operable) |
|
Definition
a) 41,138 – 44,000 – restore to greater than 44,000 in 48 hours
<41,138 – Declare DG inoperable |
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Term
| 3.8.6 Battery Parameters (Applicable when DC electrical systems are required to be operable) |
|
Definition
a) Battery Parameter OOS (voltage/Current) – Perform SR in 2 hours, Restore in 24/12 hours.
b) Battery Electrolyte low – Restore in 8 hours
c) Battery Temperature low – Restore in 12 hours
d) 2 Battery Parameters OOS - Restore in 2 hours
e) Actions not met – Declare inoperable |
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Term
| 3.8.9 Distribution System – Operating (Applicable Modes 1-4) |
|
Definition
(Applicable Modes 1-4)
a) 1 or more subsystem inoperable – Restore in 8 hours
b) 1 or more instrument bus subsystem inoperable – Restore in 2 hours
c) 1 DC subsystem inoperable – Restore in 2 hours
d) Actions not met – Mode 3 in 6 hours, Mode 5 in 36 hours
e) 2 power distribution subsystems inoperable – Enter LCO 3.0.3 |
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Term
| WHAT IS K EXCESS, WHAT IS IT THERE FOR, AND HOW DO WE CONTROL IT? |
|
Definition
1. K excess is extra fuel above and beyond what would make the reactor critical
2. It is there to offset the effects over core life of:
a. fuel burnup
b. MTC
c. fuel temp effects
d. void formation
e. fission product poison buildup
3. Controlled with control rods, boron, and burnable poisons |
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Term
| 3.8.10 Distribution System – Shutdown (Applicable Modes 5-6 or during refueling) |
|
Definition
a) 1 or more required subsystem (AC, DC or instrument bus) inoperable
1) Declare inoperable
Or
2) Suspend core alterations
3) Suspend fuel moves
4) No positive reactivity changes
5) Restore immediately
6) Declare Low Temperature Overpressure Protection (LTOP) inoperable |
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Term
| 3.8.8 Inverters – Shutdown (Applicable Modes 5-6 and refueling) |
|
Definition
a) 1 Inverter inoperable
1) Declare inoperable
Or
2) Suspend core alterations
3) Suspend fuel moves
4) No positive reactivity changes
5) Restore immediately
6) Declare Low Temperature Overpressure Protection (LTOP) inoperable |
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Term
| 3.8.7 Inverters – Operating (Applicable Modes 1-4) |
|
Definition
a) 1 Inverter inoperable – Restore in 7 days
b) Action not met – Mode 3 in 6 hours, Mode 5 in 36 hours |
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Term
| WHAT IS THE ZIRC-WATER REACTION AND HOW DO WE PREVENT ITS OCCURRENCE? |
|
Definition
Zr + 2H20 = 2H2 + ZrO2 + Heat
Zircaloy reaction with water becomes significant at 1800F
Reaction rate accelerates quickly above 2200F
Reaction becomes self-sustaining at 2800F
Our ECCS design acceptance criteria commits us to keeping the cladding under 2200F at all times. |
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Term
| WHAT ARE THE TECH. SPECS. FOR THE REACTOR CORE? |
|
Definition
4.2.1 – 193 fuel assemblies, zircaloy or zirlo clad fuel rods, natural or slightly enriched Uranium Oxide, limited substitutions of zirconium alloy or stainless steel filler rods or vacancies with NRC approval, analyzed fuel design, limited number of lead test assemblies in non-limiting core regions
4.2.2 – 53 Control Rod Assemblies, Silver Indium Cadmium, Hafnium, or mixture of both |
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Term
| WHAT IS THE PURPOSE OF THE NUCLEAR FUEL? |
|
Definition
1. Generate heat through fission under controlled safe conditions
2. Transfer heat to the reactor coolant
3. Retain radioactive fission products over a long life cycle |
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Term
| WHAT FACTORS AFFECT HEAT TRANSFER FROM THE FUEL AND HOW DO THEY CHANGE OVER CORE LIFE? |
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Definition
1. Pollution of Helium Gap – from buildup of fission product gasses, increases fuel temp over core life
2. Densification of Fuel – increases fuel temp over core life
3. Swell of Fuel – decreases fuel temp over core life
4. Clad Creep – decreases fuel temp over core life (major change to fuel over core life)
5. Corrosion and Crud Buildup – increases fuel temp over core life |
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