ML16125A360

Part 21 - Hydraulic Snubber Seal Material Deviation Interim Report

ML16125A360
Person / Time
Site:	Peach Bottom, Oconee, Arkansas Nuclear, Diablo Canyon, Farley
Issue date:	04/26/2016
From:	Ward M Anvil Engineered Pipe Supports
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML16125A360 (5)

Text

0412612016 U.S. Nuclear Regulatory Commission Operations Center Event Report Pagel Part 21 (PAR) Event# 51788 Rep Org: ANVIL ENGINEERING PIPE SUPPORT Notification Date I Time: 03/14/2016 14:07 (EDT)

Supplier: ANVIL ENGINEERING PIPE SUPPORT Event Date I Time: 10/01/2015 (EDT)

Last Modification: 04/26/2016 Region: 1 Docket#:

City: NORTH KINGSTOWN Agreement State: Yes County: License #:

State: RI NRC Notified by: MARK R. WARD Notifications: JAMES NOGGLE R1DO HQ Ops Officer: DONG HWA PARK PART 21/50.55 REACTORS EMAIL Emergency*Class: NON EMERGENCY 10 CFR Section:

21.21(a)(2) INTERIM EVAL OF DEVIATION 21.21 (d)(3)(i) DEFECTS AND NONCOMPLIANCE PART 21 - HYDRAULIC SNUBBER SEAL MATERIAL DEVIATION INTERIM REPORT "Anvil Engineered Pipe Supports (EPS) supplied 14 Fig. 200N Configuration 'A' style hydraulic snubbers to the Exelon owned and operated Peach Bottom Atomic Power Station (PBAPS) in 2013. During the course of routine refueling outage activities in October 2015, it was discovered that 9 of these 14 snubbers had no hydraulic fluid in the reservoir. The cause of the hydraulic fluid loss was premature aging of the reservoir piston seal due to vibration induced frictional heat. Subsequent laboratory testing of both replacement and degraded seal material by Exelon Power Labs suggested that a material substitution had been made from the Anvil approved Ethylene Propylene (EP) compound to a different grade of EP rubber.

"On February 17, 2016, Anvil determined that a material substitution was made by the seal vendor. A machined seal that was fabricated by the manufacturer was substituted for a seal molded with the approved Anvil compound. Prior to its installation in Fig. 200N/201 N Configuration 'A' hydraulic snubbers, the machined seal compound was not tested to establish a service life for the compound.

"Anvil has bounded the extent of condition to 4 specific seal batches of 4" and 5" Fig. 200N/201 N Configuration 'A' reservoir piston seals provided after January 1, 2013. Based on its Part 21 investigation, Anvil has yet to determine that a specific defect exists, based on the demonstrated operability of the snubbers at PBAPS despite severe service conditions beyond their published operational limits, and the compatibility of the EP base polymer with Anvil hydraulic fluids.

"Anvil is conducting a test campaign to approve and establish a service life for the machined seal compound. This testing will either qualify the machined compound for use at currently published Anvil service conditions (157 degrees F for 25 years with a total lifetime dose not to exceed 2e8 rads), or establish a reduced service life for the snubbers in which a material substitution was made. This testing is being conducted on an assembled reservoir

0412612016 U.S. Nuclear Regulatory Commission Operations Center Event Report Page 2 with the substitute machined compound. It will include irradiation of the reservoir to 6.4e7 rads, accelerated temperature aging, and a final radiation exposure to bring the cumulative dose to 2e8 rads. As of 3/14/16, the reservoir specimen had been irradiated to 6.4e7 rads with no effect on the seal.

"Anvil expects to have this testing complete by May 1, 2016, with a formal evaluation to follow. PBAPS has been notified of the material substitution, and a full accounting of the affected snubbers by serial number, PO number, site, and utility is being assembled. Anvil will notify affected sites when the testing and equivalency evaluation is complete.

"Please feel free to contact me if you have any questions or require any additional information.

"Sincerely, Mark R Ward Operations Manager Anvil Engineered Pipe Supports 160 Frenchtown Road North Kingstown, RI, 02852"

• • • UPDATE ON 4/26/2016AT12:25 EDT FROM MARK WARD (VIA FAX) TO BETHANY CECERE***

The following is a summary of information received from Anvil EPS:

Anvil performed qualification testing of the machined compound with satisfactory results. The machined compound is now qualified for a service life equivalent to the published service life of the molded compound when used as a reservoir piston seal for the Fig. 200N/201 N Configuration "A". Anvil has determined that a specific defect does not exist and no action by licensees is needed. Fifty-nine (59) total snubbers were shipped to NRC licensees (Farley, Peach Bottom, Oconee, ANO, and Diablo Canyon); Anvil will advise sites.

Notified R1 DO (Dwyer}, R2DO (Ehrhardt), R4DO (Groom) and NRR Part 21 Group.

Apr. 26. 2016 12:21PM Anvi1 EngPipe No. 0459 P. 1/3 Fax Cover Sheet To: NRC Operations Center Fax 301-816-5151 From:

Anvil Engineered Pipe Supports 401-886-3000 Pages:i

Apr. 26. 2016 12:21PM Anvi1 EngPipe No. 0459 P. 2/3 EPS Manufacturing Plant Precision Park ANVILEPS ENGINEE8ED Pf PE SUPPOA.TS 160 Frenchtown Raad North Kingstown, RI-USA 02852 Voice: (401) 886-3000 Fax: (401) 886-3010 April 18th, 2016 US Nuclear Regulatarv Cornml.sslon Document Control Desk 11555 Rockville Pike RockvlIJe, MD, 20852-2746 I ~

Subject:

Final Status and Closure of Anvil Fig. 2001\1/201N Configuration A" Size 4" and S" Hydraulic Snubber Seal Material Deviation

Reference:

USN RC Operations Center Event Report# 51788 Submitted 3/14/16 This Is to notify the US Nuclear Regulatory Commission that, in accordance with the provisions of 10CFR Part 21, Anvil Engineered Pipe Supports (Anvll} Identified a potential Issue In an Interim report concerning Anvil Fig.

200N/201N Configuration ~A!' Size 4" and 5" Hvdraulic Snubber Seal.;, and are submitting our final determination of the event, based on further evaluation and testing.

\

Anvil Informed the NRC in the referenced March 14, 2016 lnter1m*Part 21 Notification that a material substitution had been made by a seal vendor. A machined seal was supplied far (4) .specific batches of Fig.

200N/201N 4" .and 5" Configuration "A" hydraulic snubber reservoir piston seals. This machined compound was not an the list of campauhds approved by Anvll, and was a deviation from the specified molded compound. Anvil determined that the material substitution occurred In 4 specific batches provided after January l, 2013, and identified those snubbers by serial number, PO number, site and utility. See Attachment A far a full llstlng.

Anvil has performed qualification testing of the machined compound. The test campaign was designed to duplicate the qualification testing of the molded compound ta determine the equlvalency of the machined

• compound. The testing performed between 3/4/16 and 4/15/16 included irradiation of an installed seal to 2e8 rads gamma and accelerated temperature aging to simulate Z5 years of service @ 157° F. It was concluded by verification of the seal's abll!fy to hold pressure with satisfactory results. The machined compound is now qualified for a service life equivalent to the published service life of the molded compound when used as a reservoir piston seal for the.Fig. 2001\1/201N Configuration "A".

In conclusion, Anvil has determined that a specific defect does not exist and no action by licensees is needed. Anvil will advise sites that rnceived the subject snubbers of the results of its findings regarding the machined compound. Pf ease feel free to contact me if you have any questions or require any additional information.

Sincerely,

~~-6Lz.4.

Mark RWard Operations Manager Anvil Engineered Pipe Supports 160 Frenchtown Raad North Kingstown, RI, 02852 Page 1of1 B uI LD I. N G (; o* N N. Ec*t I 0 N 5 t HA 'r u~ s,.

ANV!iw.NOS; mwn* ci:1E_, Elli.liar @~w &" rANVJL ~ U G--':<"~mUtl ~

Apr. 26. 2016 12:22PM Anvi1 EngPipe No. 0459 P. 3/3 Attachment A lo Anvil Part 21 Hydraulic Seal Deviation Report Page 1/1 Snubber Serial Utility Plant Size UtllltyPO# Ref. Anvil CO# QTY Number 38905 SNA10048859 108657 3 38306 38907 Alabama Power Farley 5 SNA10057867 110456 1 88646 SNA1006211B 111557 1 39094 SNA10081535 115855 1 39411 39079 39080 39081 90059053 110313 6 39082 39083 s 39084 39321 39322 90064333 113762 4 39323 39324 90081845 10040388 6 Seal Kit 39028 Exelon Peach Bottom 39029 39030 90059053 110311 7 39031 39032 39033 4 39034 39371 39372 39373 90 065508 R-2 114700 6 39374 39375 39376 185353 115517 2 Seal Kit 5

186234 115781 1 39414 Duke Oconee 172543 110738 1 39018 4

186239 115159 1 39391 10418715 116324 3 Seal Kit 5 10422138 116912 2 Seal Kit Entergy ANO 10451406 10035787 1 39759 4 10393635 112163 1 Seal Kit 3501042219 10031269 1 31782 39752 PG&E Plablo Canyon 5 3501044574 10032982 3 39753 39754 3501052817 10035263 8 Seal Kit 39874 TPC Chin Shan 5 P015AEI017PD01 10039147 2 39875 Total Number of Seals 61

0412612016 U.S. Nuclear Regulatory Commission Operations Center Event Report Pagel Part 21 (PAR) Event# 51788 Rep Org: ANVIL ENGINEERING PIPE SUPPORT Notification Date I Time: 03/14/2016 14:07 (EDT)

Supplier: ANVIL ENGINEERING PIPE SUPPORT Event Date I Time: 10/01/2015 (EDT)

Last Modification: 04/26/2016 Region: 1 Docket#:

City: NORTH KINGSTOWN Agreement State: Yes County: License #:

State: RI NRC Notified by: MARK R. WARD Notifications: JAMES NOGGLE R1DO HQ Ops Officer: DONG HWA PARK PART 21/50.55 REACTORS EMAIL Emergency*Class: NON EMERGENCY 10 CFR Section:

21.21(a)(2) INTERIM EVAL OF DEVIATION 21.21 (d)(3)(i) DEFECTS AND NONCOMPLIANCE PART 21 - HYDRAULIC SNUBBER SEAL MATERIAL DEVIATION INTERIM REPORT "Anvil Engineered Pipe Supports (EPS) supplied 14 Fig. 200N Configuration 'A' style hydraulic snubbers to the Exelon owned and operated Peach Bottom Atomic Power Station (PBAPS) in 2013. During the course of routine refueling outage activities in October 2015, it was discovered that 9 of these 14 snubbers had no hydraulic fluid in the reservoir. The cause of the hydraulic fluid loss was premature aging of the reservoir piston seal due to vibration induced frictional heat. Subsequent laboratory testing of both replacement and degraded seal material by Exelon Power Labs suggested that a material substitution had been made from the Anvil approved Ethylene Propylene (EP) compound to a different grade of EP rubber.

"On February 17, 2016, Anvil determined that a material substitution was made by the seal vendor. A machined seal that was fabricated by the manufacturer was substituted for a seal molded with the approved Anvil compound. Prior to its installation in Fig. 200N/201 N Configuration 'A' hydraulic snubbers, the machined seal compound was not tested to establish a service life for the compound.

"Anvil has bounded the extent of condition to 4 specific seal batches of 4" and 5" Fig. 200N/201 N Configuration 'A' reservoir piston seals provided after January 1, 2013. Based on its Part 21 investigation, Anvil has yet to determine that a specific defect exists, based on the demonstrated operability of the snubbers at PBAPS despite severe service conditions beyond their published operational limits, and the compatibility of the EP base polymer with Anvil hydraulic fluids.

"Anvil is conducting a test campaign to approve and establish a service life for the machined seal compound. This testing will either qualify the machined compound for use at currently published Anvil service conditions (157 degrees F for 25 years with a total lifetime dose not to exceed 2e8 rads), or establish a reduced service life for the snubbers in which a material substitution was made. This testing is being conducted on an assembled reservoir

0412612016 U.S. Nuclear Regulatory Commission Operations Center Event Report Page 2 with the substitute machined compound. It will include irradiation of the reservoir to 6.4e7 rads, accelerated temperature aging, and a final radiation exposure to bring the cumulative dose to 2e8 rads. As of 3/14/16, the reservoir specimen had been irradiated to 6.4e7 rads with no effect on the seal.

"Anvil expects to have this testing complete by May 1, 2016, with a formal evaluation to follow. PBAPS has been notified of the material substitution, and a full accounting of the affected snubbers by serial number, PO number, site, and utility is being assembled. Anvil will notify affected sites when the testing and equivalency evaluation is complete.

"Please feel free to contact me if you have any questions or require any additional information.

"Sincerely, Mark R Ward Operations Manager Anvil Engineered Pipe Supports 160 Frenchtown Road North Kingstown, RI, 02852"

• • • UPDATE ON 4/26/2016AT12:25 EDT FROM MARK WARD (VIA FAX) TO BETHANY CECERE***

The following is a summary of information received from Anvil EPS:

Anvil performed qualification testing of the machined compound with satisfactory results. The machined compound is now qualified for a service life equivalent to the published service life of the molded compound when used as a reservoir piston seal for the Fig. 200N/201 N Configuration "A". Anvil has determined that a specific defect does not exist and no action by licensees is needed. Fifty-nine (59) total snubbers were shipped to NRC licensees (Farley, Peach Bottom, Oconee, ANO, and Diablo Canyon); Anvil will advise sites.

Notified R1 DO (Dwyer}, R2DO (Ehrhardt), R4DO (Groom) and NRR Part 21 Group.

Apr. 26. 2016 12:21PM Anvi1 EngPipe No. 0459 P. 1/3 Fax Cover Sheet To: NRC Operations Center Fax 301-816-5151 From:

Anvil Engineered Pipe Supports 401-886-3000 Pages:i

Apr. 26. 2016 12:21PM Anvi1 EngPipe No. 0459 P. 2/3 EPS Manufacturing Plant Precision Park ANVILEPS ENGINEE8ED Pf PE SUPPOA.TS 160 Frenchtown Raad North Kingstown, RI-USA 02852 Voice: (401) 886-3000 Fax: (401) 886-3010 April 18th, 2016 US Nuclear Regulatarv Cornml.sslon Document Control Desk 11555 Rockville Pike RockvlIJe, MD, 20852-2746 I ~

Subject:

Final Status and Closure of Anvil Fig. 2001\1/201N Configuration A" Size 4" and S" Hydraulic Snubber Seal Material Deviation

Reference:

USN RC Operations Center Event Report# 51788 Submitted 3/14/16 This Is to notify the US Nuclear Regulatory Commission that, in accordance with the provisions of 10CFR Part 21, Anvil Engineered Pipe Supports (Anvll} Identified a potential Issue In an Interim report concerning Anvil Fig.

200N/201N Configuration ~A!' Size 4" and 5" Hvdraulic Snubber Seal.;, and are submitting our final determination of the event, based on further evaluation and testing.

\

Anvil Informed the NRC in the referenced March 14, 2016 lnter1m*Part 21 Notification that a material substitution had been made by a seal vendor. A machined seal was supplied far (4) .specific batches of Fig.

200N/201N 4" .and 5" Configuration "A" hydraulic snubber reservoir piston seals. This machined compound was not an the list of campauhds approved by Anvll, and was a deviation from the specified molded compound. Anvil determined that the material substitution occurred In 4 specific batches provided after January l, 2013, and identified those snubbers by serial number, PO number, site and utility. See Attachment A far a full llstlng.

Anvil has performed qualification testing of the machined compound. The test campaign was designed to duplicate the qualification testing of the molded compound ta determine the equlvalency of the machined

• compound. The testing performed between 3/4/16 and 4/15/16 included irradiation of an installed seal to 2e8 rads gamma and accelerated temperature aging to simulate Z5 years of service @ 157° F. It was concluded by verification of the seal's abll!fy to hold pressure with satisfactory results. The machined compound is now qualified for a service life equivalent to the published service life of the molded compound when used as a reservoir piston seal for the.Fig. 2001\1/201N Configuration "A".

In conclusion, Anvil has determined that a specific defect does not exist and no action by licensees is needed. Anvil will advise sites that rnceived the subject snubbers of the results of its findings regarding the machined compound. Pf ease feel free to contact me if you have any questions or require any additional information.

Sincerely,

~~-6Lz.4.

Mark RWard Operations Manager Anvil Engineered Pipe Supports 160 Frenchtown Raad North Kingstown, RI, 02852 Page 1of1 B uI LD I. N G (; o* N N. Ec*t I 0 N 5 t HA 'r u~ s,.

ANV!iw.NOS; mwn* ci:1E_, Elli.liar @~w &" rANVJL ~ U G--':<"~mUtl ~

Apr. 26. 2016 12:22PM Anvi1 EngPipe No. 0459 P. 3/3 Attachment A lo Anvil Part 21 Hydraulic Seal Deviation Report Page 1/1 Snubber Serial Utility Plant Size UtllltyPO# Ref. Anvil CO# QTY Number 38905 SNA10048859 108657 3 38306 38907 Alabama Power Farley 5 SNA10057867 110456 1 88646 SNA1006211B 111557 1 39094 SNA10081535 115855 1 39411 39079 39080 39081 90059053 110313 6 39082 39083 s 39084 39321 39322 90064333 113762 4 39323 39324 90081845 10040388 6 Seal Kit 39028 Exelon Peach Bottom 39029 39030 90059053 110311 7 39031 39032 39033 4 39034 39371 39372 39373 90 065508 R-2 114700 6 39374 39375 39376 185353 115517 2 Seal Kit 5

186234 115781 1 39414 Duke Oconee 172543 110738 1 39018 4

186239 115159 1 39391 10418715 116324 3 Seal Kit 5 10422138 116912 2 Seal Kit Entergy ANO 10451406 10035787 1 39759 4 10393635 112163 1 Seal Kit 3501042219 10031269 1 31782 39752 PG&E Plablo Canyon 5 3501044574 10032982 3 39753 39754 3501052817 10035263 8 Seal Kit 39874 TPC Chin Shan 5 P015AEI017PD01 10039147 2 39875 Total Number of Seals 61