05000387/LER-1917-001, Regarding Secondary Containment Declared Inoperable Due to Airlock Doors Open Due to Sticking Door Latch: Difference between revisions

From kanterella
Jump to navigation Jump to search
(StriderTol Bot insert)
 
(StriderTol Bot change)
 
Line 1: Line 1:
{{Adams
#REDIRECT [[05000387/LER-2017-001, Regarding Secondary Containment Breach Due to Simultaneous Opening of Airlock Doors]]
| number = ML17125A030
| issue date = 05/05/2017
| title = Regarding Secondary Containment Declared Inoperable Due to Airlock Doors Open Due to Sticking Door Latch
| author name = Berryman B
| author affiliation = Susquehanna Nuclear, LLC, Talen Energy
| addressee name =
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000387, 05000388
| license number = NPF-014, NPF-022
| contact person =
| case reference number = PLA-7599
| document report number = LER 17-001-00
| document type = Letter, Licensee Event Report (LER)
| page count = 4
}}
{{LER
| Title = Regarding Secondary Containment Declared Inoperable Due to Airlock Doors Open Due to Sticking Door Latch
| Plant =
| Reporting criterion = 10 CFR 50.73(a)(2)(v), 10 CFR 50.73(a)(2)(ii)(A), 10 CFR 50.73(a)(2)(viii)(A), 10 CFR 50.73(a)(2)(ii)(B), 10 CFR 50.73(a)(2)(viii)(B), 10 CFR 50.73(a)(2)(iii), 10 CFR 50.73(a)(2)(ix)(A), 10 CFR 50.73(a)(2)(iv)(A), 10 CFR 50.73(a)(2)(x), 10 CFR 50.73(a)(2)(v)(A), 10 CFR 50.73(a)(2)(v)(B), 10 CFR 50.73(a)(2)(i)(A), 10 CFR 50.73(a)(2)(i)(B), 10 CFR 50.73(a)(2)(vii), 10 CFR 50.73(a)(2)(i)
| Power level =
| Mode =
| Docket = 05000387
| LER year = 1917
| LER number = 1
| LER revision = 0
| Event date =
| Report date =
| ENS =
| abstract =
}}
 
=text=
{{#Wiki_filter:'
HAY 0 5., 2017 Brad Berryman Site Vice President U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Susquehanna Nuclear, LLC 769 Salem Boulevard Berwick, PA 18603 Tel. 570.542.2904 Fax 570.542.1504 Brad.Berryman@TalenEnergy.com SUSQUEHANNA STEAM ELECTRIC STATION LICENSEE EVENT REPORT 50-388(387)/2017-001-00 UNIT 1 LICENSE NO. NPF-14 UNIT 2 LICENSE NO. NPF-22 PLA-7599 TALEN~
ENERGY 10 CFR 50.73 Docket No. 50-387 50-388 Attached is Licensee Event Report (LER) 50-3 88(3 87)/20 17-001-00. The LER reports an event involving both doors of a Secondary Containment airlock being open at the same time. This event was determined to be reportable in accordance with 10 CFR 50.73(a)(2)(v)(C) as a condition that could have prevented fulfilment of a safety function.
There were no actual consequences to the health and safety of the public as a result of this event.
This letter contains no new regulatory commitments.
B. Benyman Attachment: LER 50-388(387)/2017-001-00 Copy:
NRC Region I Ms. T. E. Hood, NRC Project Manager Ms. L. H. Micewski, NRC Sr. Resident Inspector Mr. M. Shields, PA DEP/BRP
 
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 0313112020 (04-2017) httQ ://www. nrc. gov/reading -rm/doc-co llections/nur~s/staff/sr1 022/r3[J the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
: 1. FACILITY NAME
~- DOCKET NUMBER
,3. PAGE Susquehanna Steam Electric Station Unit 2 05000388 1 OF3
: 4. TITLE Secondary Containment Declared Inoperable Due to Airlock Doors Open Due to Sticking Door Latch
: 5. EVENT DATE
: 6. LER NUMBER
: 7. REPORT DATE
: 8. OTHER FACILITIES INVOLVED SEQUENTIAL FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR REV MONTH DAY YEAR Susquehanna Steam Electric Station Unit 1 NUMBER NO.
05000387 03 06 2017 2017
:- 001
:- 00 05
~s 2017 FACILITY NAME DOCKET NUMBER 05000
: 9. OPERATING MODE
: 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: Check all that apply) 5 D 20.2201(b)
D 20.2203(a)(3)(i) 0 50.73(a)(2)(ii)(A)
D 50.73(a)(2)(viii)(A)
D 20.2201 (d)
D 20.2203(a)(3)(ii) 0 50.73(a)(2)(ii)(B) 0 50.73(a)(2)(viii)(B)
D 20.2203(a)(1)
D 20.2203(a)(4)
D 50.73(a)(2)(iii)
D 50.73(a)(2)(ix)(A)
D 20.2203(a)(2)(i)
D 50.36(c)(1)(i)(A)
D 50.73(a)(2)(iv)(A)
D 50.73(a)(2)(x)
: 10. POWER LEVEL D 20.2203(a)(2)(ii)
D 50.36(c)(1 )(ii)(A)
D 50.73(a)(2)(v)(A)
D 73.71(a)(4)
D 20.2203(a)(2)(iii)
D 50.36(c)(2) 0 50.73(a)(2)(v)(B)
D 73.71 (a)(5) 000 D 20.2203(a)(2)(iv)
D 50.46(a)(3)(ii)
~ 50.73(a)(2)(v)(C) 0 73.77(a)(1)
D 20.2203(a)(2)(v)
D 50.73(a)(2)(i)(A)
D 50.73(a)(2)(v)(D)
D 73.77(a)(2)(i)
D 20.2203(a)(2)(vi)
D 50.73(a)(2)(i)(B)
D 50.73(a)(2)(vii)
D 73.77(a)(2)(ii)
D 50.73(a)(2)(i)(C) 0 OTHER Specify in Abstract below or in NRC Form 366A
: 12. LICENSEE CONTACT FOR THIS LER LICENSEE CONTACT
~~LEPHONE NUMBER (Include Area Code) lc. E. Manges, Jr., Senior Engineer-Nuclear Regulatory Affairs 1(570) 542-3089
: 13. COMPLETE ONE UNE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT
 
==CAUSE==
SYSTEM COMPONENT MANU-REPORTABLE
 
==CAUSE==
SYSTEM COMPONENT MANU-REPORTABLE FACTURER TO EPIX FACTURER TO EPIX X
NG DR N/A N
: 14. SUPPLEMENTAL REPORT EXPECTED
: 15. EXPECTED MONTH DAY YEAR D YES (If yes, complete 15. EXPECTED SUBMISSION DATE) fZI NO SUBMISSION DATE fl\\BSTRACT (Limit to 1400 spaces, ie., approximately 15 single-spaced typewritten lines)
On March 6, 2017 at approximately 1325 hours, both airlock doors of a secondary containment airlock were momentarily open at the same time causing an alarm. The event occurred at the Unit 2 airlock between the Turbine Building (TB) and Reactor Building (RB) on Elevation 676. Individuals on the TB side of the airlock verified a green light and opened the TB side door, causing the RB side door to pop open from differential pressure. The individual on the RB side, who was using the security card reader, saw the RB door pop open. The doors were immediately closed, reestablishing secondary containment.
With both airlock doors open simultaneously, Surveillance Requirement (SR) 3.6.4.1.3 was not met. The condition is being reported in accordance with 10 CFR 50. 73(a)(2)(v)(C) as a condition that could have prevented fulfillment of a safety function.
The cause was determined to be sticking of the door latch inside the crash bar, which prevented the RB side airlock door from properly latching and staying latched when differential pressure was applied, such as when the TB side door was opened. Corrective action included replacing the crash bar on the RB side door.
There were no actual consequences to the health and safety of the public as a result of this event.
NRC FORM 366 (04-2017)
 
==CONDITIONS PRIOR TO EVENT==
Unit 1 - Mode 1, approximately 100 percent Rated Thermal Power Unit 2-Mode 5, approximately 0 percent Rated Thermal Power YEAR 2017
: 3. LER NUMBER SEQUENTIAL NUMBER
:- 001 There were no structures, systems, or components that were inoperable at the start of the event that contributed to the event.
 
==EVENT DESCRIPTION==
REV NO.
:- 00 On March 6, 2017 at approximately 1325 hours, both airlock doors [EllS Component Identifier: DR] of a secondary containment airlock [EllS System/Component Identifier: NG/AL] were momentarily open at the same time causing an alarm [EllS Component Identifier: ALM]. The following provides details of the event:
The event occurred at the Unit 2 airlock between the turbine building (TB) [EllS System Identifier: NM] and reactor building (RB) [EllS System Identifier: NG] on Elevation 676. Individuals on the TB side of the airlock verified a green light and opened the TB side door, causing the RB side door to pop open from differential pressure. The individual on the RB side, who was using the security card reader, saw the RB door pop open. The doors were immediately closed, reestablishing secondary containment.
Investigation identified that the latch on the RB side door appeared to be sticking (e.g. not fully returning to the latched position once released) when the crash bar was engaged.
With both airlock doors open simultaneously, Surveillance Requirement (SR) 3.6.4.1.3 was not met. The condition is being reported in accordance with 10 CFR 50. 73(a)(2)(v)(C) as a condition that could have prevented fulfillment of a safety function.
 
==CAUSE OF EVENT==
The cause was determined to be sticking of the RB side door latch inside the crash bar, which prevented the door from properly latching and staying latched when differential pressure was applied, such as when the TB side door was opened. The most likely cause of the crash bar latch failing to reset properly is abnormal wear from heavy use during outage mobilization exacerbated by mechanical damage suffered during impacts with wheeled carts carrying material through the airlock.
 
==ANALYSIS/SAFETY SIGNIFICANCE==
An engineering evaluation was performed and concluded that secondary containment could have performed its safety function of isolating as assumed in the accident analysis and also of re-establishing 0.25 inches vacuum (drawdown) within the assumed accident analysis time (1 0 minutes). Therefore, the subject event did not cause a loss of safety function. This event will not be counted as a safety system functional failure (SSFF) for the NRC performance indicator based on the engineering analysis that shows there was no loss of ability to fulfill the safety function.
NRC FORM 3668 (04-2017)
Page 2 of 3 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 3/3112020 (04-2017)
LICENSEE EVENT REPORT (LER)
CONTINUATION SHEET (See NUREG-1 022, R.3 for instruction and guidance for completing this form http:/ /WNW. nrc. gov/reading-rm/doc-collections/nu regs/staff/sr1 022/r3{)
Estimaled, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
: 3. LER NUMBER Susquehanna Steam Electric Station Unit 2
 
==CORRECTIVE ACTIONS==
Key corrective actions include the following:
: 1. The crash bar on the RB side door was replaced.
 
==COMPONENT FAILURE INFORMATION==
Reactor Building Elevation 676 Door 120A Latch
 
==PREVIOUS SIMILAR EVENTS==
YEAR 05000388 2017 SEQUENTIAL NUMBER
:- 001 The following are recent LERs involving loss of secondary containment due to human performance issues associated with airlock doors:
REV NO.
:- 00 LER 50-387(388)/2017-002-00, "Secondary Containment Breach Due to Simultaneous Opening of Airlock Doors,"
dated April12, 2017.
LER 50-387(388)/2017-001-00, "Secondary Containment Breach Due to Simultaneous Opening of Airlock Doors,"
dated March 8, 2017.
LER 50-387(388)/2016-025-00, "Secondary Containment Breach Due to Simultaneous Opening of Airlock Doors,"
dated January 26, 2017.
LER 50-387(388)/2016-023-00, "Secondary Containment Declared Inoperable Due to a Human Performance Error," dated November 21, 2016 LER 50-387(388)/2016-022-00, "Secondary Containment Breach due to Simultaneous opening of Airlock Doors,"
dated December 1, 2016 LER 50-387(388)/2016-021-00, "Secondary Containment Declared Inoperable Due to a Human Performance Error," dated August 17, 2016 LER 50-387(388)/2016-015-00, "Secondary Containment Declared Inoperable Due to Airlock Doors Open Due to A Human Performance Error," dated June 15, 2016 LER 50-387(388)/2016-014-00, "Secondary Containment Declared Inoperable Due to Airlock Doors Open Due to A Human Performance Error," dated June 9, 2016 LER 50-387(388)/2016-013-00, "Secondary Containment Declared Inoperable Due to Simultaneous Opening of Double Airlock Doors," dated June 9, 2016 LER 50-388(387)/2016-002-00, "Secondary Containment Breach due to Simultaneous Opening of Airlock Doors Due to Degraded Latch Mechanism," dated May 26, 2016.
LER 50-388(387)/2016-001-00, "Secondary Containment Breach due to Simultaneous Opening of Airlock Doors Due to Degraded Latch Mechanism," dated May 24, 2016.
LER 50-387(388)/2016-005-00, "Secondary Containment Declared Inoperable Due to Airlock Doors Open Due to Human Performance Error," dated May 16, 2016.
NRC FORM 3668 (04-2017)
}}
 
{{LER-Nav}}

Latest revision as of 11:22, 9 January 2025

Redirect to:

Retrieved from "https://kanterella.com/w/index.php?title=05000387/LER-1917-001,_Regarding_Secondary_Containment_Declared_Inoperable_Due_to_Airlock_Doors_Open_Due_to_Sticking_Door_Latch&oldid=5143999"