Start-up P&L's Flashcards

1
Q

For a plant start-up following a reactor trip, why must we review TRP-001?

A

Ensures that the cause of the trip is known and all auto responses have functioned properly and that a unit is not returned to service with unidentified safety problems.

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2
Q

Why must a Reactor Engineer be present as part of the control room team during approach to criticality and power changes until 30% RTP?

A

Ensures team has technical expertise to manage changes in reactivity IAW standards and expectations.

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3
Q

When changing RCS boron concentration, why do we use PZR spray and how do we accomplish this?

A

Minimizes the difference by PZR and loop boron concentration from a PZR out surge.

Accomplished by energizing the heaters.

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4
Q

When do we maintain shutdown banks fully withdrawn?

A

Provide additional margin when reactivity is being changed by boron or xenon changes, RC temp or motion of control banks.

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5
Q

If during any step involving boron dilution the SR count rate increase is greater than anticipated, why must you stop immediately and involve the SM?

A

Potential loss of SDM

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6
Q

Why are concurrent positive reactivity additions by more than one method while going critical or at low power near the POAH prohibited?

A

Recommendation of SOE 88-02.

Limiting addition to only one source better enables the operator to control reactivity.

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7
Q

What do TS 3.4.1, 3.4.4 and 3.4.5 assure?

A

Adequate DNBR margin during Condition I or II events in this Mode.

Ensures Integrity of secondary ESF features when a loop in no longer coupled to the secondary.

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8
Q

Why must the group step counters for that bank be at zero steps before withdrawing any rod bank from the fully inserted position?

A

To ensure proper bank overlap.

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9
Q

How is temperature recovered if the temperature lowers below 541*F?

A

Reduction in steam demand

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10
Q

Why would we desire to have SG Blowdown in service during a startup?

A

To remove impurities to prevent SG tube degradation

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11
Q

What is meant by mode changes with DEGRADED equipment is permissible provided OPR-001 has been performed?

A

Equipment cannot be physically inoperable

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12
Q

Why is it crucial for the operator controlling the Reactor and the operator controlling SG levels to communicate and utilize precise control?

A

Changing reactor power will shrink and swell SG levels.

Changing feed flow rate will raise and lower reactor power.

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13
Q

Why can you not energize any control or shutdown rods unless all MTI star-up STPs are complete and current?

A

MTI start-up surveillances can only be performed while shutdown.

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14
Q

Why might reactor engineering notify Operations that control rods have a much higher rod worth?

A

INPO SER 21-88 Commitment

The magnitude of a + MTC is reduced by decreasing boron concentration, which lowers the critical rod height. As a result, worth may be as much as 5X higher

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15
Q

Which instruments must be utilized as a minimum when monitoring the approach to criticality?

A
  1. ICRR Plot (until SR NIs are de-energized)
  2. Audio Count Rate (until SR NIs are de-energized)
  3. Nuclear Instrumentation
  4. RCS delta T
  5. Reactivity Computer (if available)
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16
Q

Why should delta T power be monitored as a backup indication for NIs power?

A

SOER 90-03 Recommendation

Core thermal power is not calculated until approx 30%

17
Q

Why should control rods be reinserted if the approach to criticality is suspended for an extended period of time?

A

Sitting close to critical for a long period of time increases the possibility of achieving an inadvertent criticality in an uncontrolled fashion.

Sitting could result in changes in reactivity parameters used in the ECP calculation.

18
Q

When changing the Rod Bank Selector Switch position, why is in important to not go thru AUTO?

A

Precludes possibility of inadvertently driving the P-A converter to 999 due to inward demand or to prevent inadvertent rod motion

19
Q

Why should the SG PORVs not be used as a planned method of RCS temperature control?

A

This minimizes expenditure of pure water and minimizes the noise to the surrounding communities.

20
Q

Whose permission is needed to use SG PORVs as the planned method of RCS temperature control?

A

Ops Director

21
Q

How does rod withdrawal limits help ensure MTC stays inside TS Limits?

A

Limiting rod withdrawal requires RCS boron reduction to raise power. Reducing boron causes MTC to be more negative