VY HPCI sys DECLARED INOPERABLE DUE TO STEAM LEAK
Posted in the Brattleboro Forum
#1 Nov 1, 2013
HIGH PRESSURE COOLANT INJECTION SYSTEM DECLARED INOPERABLE DUE TO STEAM LEAK
"On 9/18/13, during performance of the High Pressure Coolant Injection (HPCI) pump operability surveillance, a minor steam leak was discovered on the governor valve inspection cover flange. Due to the leak, HPCI was declared inoperable.
"Actions taken: A 14-day LCO per TS 3.5.E.2 has been entered and corrective actions are in progress."
The licensee has notified the NRC Resident Inspector.
*** RETRACTION FROM BENJAMIN EGNEW TO HOWIE CROUCH AT 1341 EDT ON 10/31/13 ***
"After further evaluation, the gasket leak at the flange was determined to have no impact on the operability of the HPCI system, and therefore the HPCI system was able to perform all safety functions with the identified condition. The immediate determination, made on September 18, 2013, that the HPCI system was inoperable was revised based on the results of an analysis of the HPCI room heat up rate. The heat up rate was modeled using a calculated steam leak rate based on actual measurements of the damaged gasket after removal from the HPCI turbine flange. The time to heat up was based on the first set point at which isolation due to a temperature increase would occur. It was determined that the existing gap in the gasket represented approximately one-tenth of the approximate size of a steam leak that would be expected to result in an isolation, therefore the existing flange leak had no impact on operability of the HPCI system or its ability to mitigate the consequences of an accident.
"The licensee has notified the NRC site Resident Inspector."
#2 Nov 1, 2013
This is why they need their licence yanked.
#3 Nov 1, 2013
Why couldnt they say we discovered the leak, found it unacceptable and we immediately commenced to repair it.
#4 Nov 1, 2013
Have they had a host of issues with HPCI gaskets and steam leaks...
#5 Nov 1, 2013
They could pull this off the wall technical stuff to justify anything...
#6 Nov 1, 2013
Did they hve the repair gasket on site...you sure you put the right on in?
#7 Nov 1, 2013
Hey Dummmy, that is exactly what they did. They declared HPCI inoperable due to the steam leak. They repaired the gasket and performed an operability test to verify the steam leak was gone.
After further investigations, HPCI was actually operable but VY made the conservative decision to declare HPCI inop. When this happens, an update notification to the NRC is required.
#8 Nov 1, 2013
The heat up rate was modeled using a calculated steam leak rate based on actual measurements of the damaged gasket after removal from the HPCI turbine flange.
Was it leaking before this?
Why wasn't the leak rate based on the worst possible instead of the actual?
You know, being conservative...
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