Wednesday, April 13, 2011...Transcipts on 2.206 about VY reliefs concern buna n thread material
“In Browns Ferry at Unit 1, another LER, 2009-004, I can make a comment that there's questions of the, if everything is reported in LERs, but these are just three of a bunch of LERs. Interesting Buna N material defect was without fibers. It was in the HPCI oil control. That was also due to heat.”
Well., I mean to say it was in hydraulic oil....
Wednesday, April 13, 2011...Transcripts on 2.206 about VY reliefs concerning buna n thread material
So for the VY threaded Buna n, I tried to bring in three industry example, o rings, hydraulic diaphragm and air diaphragms as the scram solenoid valves. Browns Ferry was the hydraulic diaphragm issue, and it is identical to the pilgrim...
“In Browns Ferry at Unit 1, another LER, 2009-004, I can make a comment that there's questions of the, if everything is reported in LERs, but these are just three of a bunch of LERs. Interesting Buna N material defect was without fibers. It was in the HPCI oil control. That was also due to heat.”
Well., I mean to say it was in hydraulic oil....
April 15, 2011
PILGRIM NUCLEAR POWER STATION'NRC PROBLEM IDENTIFICATION AND RESOLUTION INSPECTION REPORT O5OOO293/201 1OO8
02/14/2011 – 03/04/2011
Findings
(1) Failure to Follow Corrective Action Process for HPCI Diaphragm Degraded Condition Introduction: The NRC identified a finding of very low significance (Green) for Entergy's failure to follow their corrective action process in the identification, documentation, and evaluation of a degraded condition. Specifically, Entergy failed to recognize and capture in their condition report process that a diaphragm in the HPCI system exceeded its service life.
Description: On March 22,2Q10, GE Hitachi issued a Safety Information Communication in conjunction with the 10 Code of Federal Regulations (CFR) Part21
Report titled, "Failure of HPCI Turbine Overspeed Reset Control Valve Diaphragm." The failure of this diaphragm would result in a loss of the HPCI turbine lube and control oil and could ultimately result in a failure of the HPCI system. Entergy identified that a 'like' diaphragm was installed in Pilgrim's HPCI system pressure control valve (PCV-2301-238) and evaluated the 10 CFR Part 21 Report on July 20, 2010 in CR-PNP-2010-2500. Entergy concluded that the manufacturing defect in the diaphragm described in the Part 21 evaluation was not directly applicable to Pilgrim because the report specified a manufacturing year of 1984 or later. Pilgrim's PCV-2301-238 diaphragm was manufactured in 1981, however it was the same design (2-ply fabric-reinforced BUNA-N material) as specified in the Part2l evaluation. Since the diaphragm was installed and could not be completely inspected to verify reinforcing-fiber continuity, Entergy appropriately scheduled the diaphragm to be replaced during the next HPCI maintenance window, as recommended by the manufacture.
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