Self Study (ES, H2O2, Boron Precip) Flashcards
What are entry conditions for abnormal ES bus voltage low/high?
Low - 4160V ES bus voltage < 3770V or 480V ES bus voltage < 439V
High - 4160V ES bus voltage > 4440V or 480V ES bus voltage > 515V
What are major actions for AB ES Bus voltage low?
If online, monitor generator output voltage and MVARs. Contact TCC and determine if voltage regulator operating properly
If offline, notify TCC and have them disable 3% voltage reduction if in house loads powered from SU1 or SU2. If in mode 5 or 6 and not corrected then attempt to raise voltage by reducing large loads. If normal voltages are not regained and grid conditions are stable then parallel DG to grid and separate ES bus from grid with DG supplying. If grid disturbances expected or unable to match voltages then de-energize bus and ensure EDG ties on.
What are major actions for AB ES Bus voltage high?
If online, monitor generator output voltage and MVARs. Contact TCC for adjustments and determine if voltage regulator operating properly.
If offline, notify TCC and have them enable 3% voltage reduction if in house loads powered from SU1 or SU2. If in mode 5 or 6 and not corrected then attempt to lower voltage by adding large loads. If normal voltages are not regained in 4 hours and grid conditions are stable then parallel DG to grid and separate ES bus from grid with DG supplying. If grid disturbances expected or unable to match voltages then de-energize bus and ensure EDG ties on.
What are entry conditions into offsite voltage abnormal section?
What actions are taken in offsite voltage abnormal section?
Perform verification of offsite power source supplement, contact TCC for readings and have them adjust in band. If TCC unable to adjust voltage then consider adjusting voltage by starting or stopping large loads and reduce or raise loading to raise/lower voltage.
What are entry conditions into offsite frequency low section and what are the major actions?
Entry - Grid frequency < or equal to 59.5 hz.
Actions - Contact TCC. If grid conditions are stable then parallel DG to grid and separate ES bus from grid with DG supplying. If grid disturbances expected or unable to match voltages then de-energize bus and ensure EDG ties on.
What actions are taken in Above Normal H2/O2 Concentration?
If any H2/O2 concentration enters Region C (detonable 19% H2/10% O2) then suspend all additions of waste gas to system, return values to region B (flammable 4% H2/4% O2) without delay and consider evacuating Aux Bldg.
If any H2/O2 concentration enters Region B (detonable) then take action within 24 hours to return concentration to region A.
How is the H2O2 system normally aligned?
Normally both analyzers aligned to T-17. If only one operable, it shall be aligned to T-17 until it reaches region B when it should monitor the tank being filled.
T-18 max pressure is 85 psig.
What tanks are capable of being monitored by H2O2 Analyzers?
T-17, T-18s, T-12s, T-20s, Quench Tank, T-11
What are max pressures/relief setpoints for tanks in the waste gas system?
T-17 - Rupture disc blows at 18 psig and the relief goes at 20 psig. Relieves to GRW discharge header downstream of F-16.
T-18s - taken out of service at 85 psig (ensures maximum safe operating pressure of 88 psig is not exceeded which provides sufficient volume in tank to allow tank contents to be diluted by nitrogen.. Rupture disk blows at 125 psig and the relief lifts at 120 psig and relieves back to T-17.
What are entry conditions for Actions to Preclude Boron Precipitation?
- CET temp < 310 deg F
- SCM has been less than adequate for duration of LOCA
When is Actions to Preclude Boron Precipitation AOP required to be completed?
Complete within 5 hours of LOCA.
What actions are taken if BOTH DH trains operable, RCS hot leg level above minimum and CETs < 280 deg F in actions to preclude boron precipitation?
Close either DH supply to MU pump suction valve (CV-1276/1277) and continue LPI cooling with one train while placing the other train in service per decay heat removal during cooldown section.
What major steps in ATPBP if an LPI pump is inoperable or hot leg level is below minimum?
- If HPI and Spray pumps associated with inoperable/idle DH pump are off then ensure associated BWST outlet closed.
- Align DH pump from BWST and RCS and open RB sump outlet and align DH suction valves to gravity flow from RCS hot leg to RB sump and monitor CET SCM becomes adequate.
What steps are taken in ATPBP if steps 4 or 5 are unsuccessful for establishing flow through the core?
Establish reverse flow through the core using PZR aux spray
