16:10 Oct 15, 2019
High Pressure Coolant Injection (Hpci) System Inoperable
On 10/15/19 at 1210 [EDT] Peach Bottom discovered a degraded spring hanger (23DBN-H39) associated with Unit 3 High Pressure Coolant Injection (HPCI) system. The hanger is located downstream of MO-3-23-14 HPCI Steam Supply Valve before the HO-3-23-4513 Turbine Stop Valve. A review of the piping and support design analysis were performed and concluded the U3 HPCI turbine inlet nozzle would potentially exceed its allowable stresses. Following Engineering review, U3 HPCI was declared inoperable at 1743 [EDT].
This report is being submitted pursuant to 10 CFR 50.72(b)(3)(v)(D).
The NRC Resident Inspector has been notified.
Additional evaluation by Engineering personnel determined that the degraded spring hanger would have no adverse effect on the subject piping or HPCI turbine nozzle structural integrity. Pressure, deadweight, and seismic stresses were within allowable limits. Non-destructive examination (NDE) of the piping and nozzle was performed to identify any signs of cracking, yielding, or defects. NDE results were satisfactory. The degraded spring hanger did not effect the Unit 3 HPCI system operability and this call is being retracted.
The NRC Resident Inspector has been notified.Notified R1DO (Cahill).
|Peach Bottom |
Pennsylvania (NRC Region 1)
|10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident|
|LER:||look for an ler...|
|Time - Person (Reporting Time:+3.07 h0.128 days <br />0.0183 weeks <br />0.00421 months <br />)|
19:14 Oct 15, 2019
|NRC Officer:||Brian Lin|
|Last Updated:||Nov 22, 2019|
|54330 - NRC Website|