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{{Adams
#REDIRECT [[05000387/LER-2016-001]]
| number = ML16109A238
| issue date = 04/18/2016
| title = LER 16-001-00 for Susquehanna, Unit 1, Regarding Secondary Containment Declared Inoperable Due to an Airlock Doors Open Due to Random Occurrence
| author name = Franke J A
| 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-7453
| document report number = LER 16-001-00
| document type = Letter, Licensee Event Report (LER)
| page count = 4
}}
 
=Text=
{{#Wiki_filter:APR 18 2016 Jon A. Franke Susquehanna Nuclear, LLC Site Vice President 769 Salem Boulevard Berwick, PA 18603 Tel. 570.542.2904 Fa x 570.542.1504 Jon.Franke@TalenEnergy.c om U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 SUSQUEHANNA STEAM ELECTRIC STATION LICENSEE EVENT REPORT 50-387(388)/2016-001-00 UNIT 1 LICENSE NO. NPF-14 UNIT 2 LICENSE NO. NPF -22 PLA-7453 TALEN-6 ENERGY 10 CFR 50.73 Docket No. 50-387 50-388 Attached is Licensee Event Report (LER) 50-387(388)/2016-001-00.
The LER repmis an event involving Secondary Containment being declared inoperable due to both doors of an airlock being open at the same time. This event was determined to be repmiable 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 . . 'A. Franke /
 
==Attachment:==
 
LER 50-387(388)/2016-001-00 Copy: NRC Region I Mr. J. E. Greives, NRC Sr. Resident Inspector Ms. T. E. Hood, NRC Project Manager Mr. M. Shields, PA DEP/BRP NRC FORM366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2018 (1 1-20 1 5) .. ,.,(!,.( E s tim ated bur den per r esponse t o com pl y wit h thi s manda t ory co ll ect i o n req u est: 80 ho u rs.
Reported l esso n s l ea rn ed are in co rp o r ated in to t h e lice n si n g pr ocess an d fed back to i n dustry. Z' LICENSEE EVENT REPORT (LER) Send co mm e nt s r ega r di n g bur de n es tim a t e to t h e FO IA, Pri vacy and Inf or m a ti o n Co ll ections ...... ... <0'.: B r anc h (T*5 F5 3), U.S. Nu c l ear R eg ul a t o ry Co mmi ssio n , W as h i n g t on, DC 20555-000 1, or b y (See Page 2 for required number of inte rn et e-m a il to l nfocollec t s.Reso ur ce@nrc.gov, and t o the Desk Officer, Off i ce of I nfor m a t io n and digits/characters for each block) R egula t ory A ffa ir s, NEOB*1 0202, (3 1 50-0 1 04), Office of Management an d B u dget, Was hin g t on , DC 20503. If a m ea n s used t o i mpose a n i n fo rm ation collection d oes not disp l ay a c ur re n tly val i d OMB co ntr o l nu m b er, t he N R C may n ot co n d u ct or sponso r, a nd a perso n is not r eq u i r ed t o r espo n d to, the i n fo nm atio n collec ti o n. 1. FACILITY NAME 2. DOCKET NUMBER r* PAGE Susquehanna Steam Electric Station Unit 1 05000387 1 of 3 4. TITLE Secondary Containment Declared Inoperable Due to an Airlock Doors Open Due to Random Occurrence
: 5. EVENT DATE 6. LER NUMBER 7. REPORT DATE 8. OTHER FACILITIES INVOLVED Y EAR I SEQUENTI A L I REV FA C ILITY NAME D OCK ET NUMBE R M O NTH D AY Y EAR M O NTH D AY Y EA R Susquehann a Steam Ele c tri c St a tion Unit 2 05000388 NUMBER N O. Olf-18' FA C ILIT Y NA M E D OCK ET NUMBER 02 22 2016 2016 -001 -00 2016 05000 9. OPERATING MODE 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR &sect;:(C he c k a ll that apply) D 20.2201(b) D 2 0.2203(a)(3)(i) D 50.73(a)(2)(ii)(A) D 50.73(a)(2)(viii)(A) 1 D 20.2 2 01(d) D 20.220 3 (a)(3)(ii) D 50.7 3 (a)(2)(ii)(B)
D 50.73(a)(2)(viii)(B)
D 20.220 3 (a)(1) D 2 0.2 20 3 (a)(4) D 50.73(a)(2)(iii) D 50.7 3 (a)(2)(i x)(A) D 2 0.2 203(a)(2)(i)
D 50.3 6 (c)(1 )(i)(A) D 50.73(a)(2)(i v)(A) D 50.7 3 (a)(2)(x) D 2 0.2 203(a)(2)(ii) D 50.3 6 (c)(1 )(ii)(A) D 50.7 3 (a)(2)(v)(A) D 73.71(a)(4)
: 10. POWER LEVEL D 2 0.22 03(a)(2)(iii) D 50.3 6(c)(2) D 50.73(a)(2)(v)(B)
D 7 3.71(a)(5)
D 20.2 20 3 (a)(2)(iv)
D 50.46(a)(3)(ii) l:8l 50.7 3 (a)(2)(v)(C)
D 7 3.77(a)(1) 092 D 2 0.220 3 (a)(2)(v)
D 50.73(a)(2)(i)(A)
D 50.73(a)(2)(v)(D)
D 7 3.77(a)(2)(i) D 20.2203(a)(2)(vi)
D 50.7 3 (a)(2)(i)(B)
D 50.7 3 (a)(2)(vii)
D 7 3.77(a)(2)(ii)
D 50.73(a)(2)(i)(C) 0 OTHER S p ec i fy in Abs tr ac t be l ow o r in N RC F orm 366 A 12. LICENSEE CONTACT FOR THIS LER LI C E NS EE CO NT AC T r ELE PHON E NU MER (I nclude A r ea Code) C. E. Manges , Jr., Senior Eng i neer-Nuclear Regulatory Affairs (570) 542-3 089 13. COMPLETE ONE UNE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT CAU S E SYS TEM CO MP O NENT MANU-REP O RTABLE C AUSE S Y STEM M ANU-REPORTABLE FA C TU R ER T O EP IX FA C TURER TO EPI X 14. SUPPLEMENTAL REPORT EXPECTED 15. EXPECTED M O NTH DA Y Y EAR D YES (If y e s , complete 15. EXPECTED SUBMISSION DATE) I:8J NO SUBMISSION DATE A B S TRA C T (Li mit t o 1 40 0 s p aces, i.e., a p p r ox imatel y 1 5 sing l e-s p ac ed typ ewritten lin es) On February 22, 2016 at approximately 1345 , a contract employee leaving the Unit 1 Reactor Building swiped his keycard and received a green light to enter the airlock. Upon opening the airlock door, he discovered two Susquehanna employees entering the airlock from the opposite side. The statement from the Susquehanna employees indicates that the green light to enter the airlock was observed.
They were entering the airlock to traverse to the Unit 1 Reactor Building when the door on the Unit 1 Reactor Building side opened. After this incident, the airlock indication was tested and all equipment checked satisfactorily. With both airlock doors open simultaneously , Secondary Containment was briefly inoperable due to failure to meet Surveillance Requirement (SR) 3.6.4.1.3.
This event was reported in accordance with 10 CFR 50. 72(b)(3)(v)(C) as a condition that could have prevented fulfillment of a safety function (EN 51750). The condition also requires a Licensee Event Report (LER) in accordance with 10 CFR 50. 73(a)(2)(v)(C).
The cause of the event was determined to be random occurrence.
There were no corrective actions required to address the cause. Although human performance issues were not involved, actions have been taken to improve human performance associated with airlock door use. There were no actual consequences to the health and safety of the public as a result of this event. NR C FORM 3 66 (1 1-2 015)
Page 2 of 3 NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2018 1 1-20 1 5) 1. FACILITYNAME LICENSEE EVENT REPORT (LER) CONTINUATION SHEET Susquehanna Steam Electric Station, Unit 1 NARRATIVE CONDITIONS PRIOR TO EVENT Unit 1 -Mode 1, 92 percent Rated Thermal Power Unit 2 -Mode 1, 1 00 percent Rated Thermal Power E stima t e d burden per r esponse to comp l y wit h th is ma n datory co ll ec ti on r e qu est: 80 hou r s. R eported l esso n s l earned are i n corpo r a t e d i nt o th e li ce n sing p rocess a nd f e d back t o in dus try. Se nd co mm e nt s r ega rding burd e n es timat e t o th e FOI A, P rivacy a n d Inform a ti o n Co ll ec ti o n s B r an c h (T*5 F 53), U.S. Nuc l ea r Re g ul atory Commiss i o n , Washi n g t on, DC 20555*000 1 , or b y int e rn e t e-m a il to l n f oco ll ects.R esou r ce@nr c.gov, a n d t o th e D esk Office r , Office of In f or m a ti o n a n d R eg ul atory A ffai r s, N E OB-10202, (3 1 50-0 1 04), Office o f Ma n a g e m e nt a n d Budget, W as hin gto n , D C 20503. If a m eans used to im pose a n i nf o rm a ti on co ll ec ti o n does not display a c urr en tl y v al i d O MB co ntr ol numb e r , the N R C m ay not con du ct or sponsor, a nd a pe r son is n o t requ ir e d to r espo nd t o, the i n forma t ion co ll ect i on. 2. DOCKET NUMBER 3. LER NUMBER YE A R I S E QUE N T I A L I R E V NU MBER NO. 05000387 2016 -001 -00 There were no structures, systems, or components that were inoperable at the start of the event that contributed to the event. EVENT DESCRIPTION On February 22, 2016 at approximately 1345, a contract employee leaving the Unit 1 Reactor Building [EllS System Identifier
: NG] swiped his keycard and received a green light [EllS Component Identifier:
IL] to enter the airlock [EllS Component Identifier:
AL]. Upon opening the airlock door [EllS Component Identifier:
DR], he discovered two Susquehanna employees entering the airlock from the opposite side. The statement from the Susquehanna employees indicates that the green light to enter the airlock was observed.
They were entering the airlock to traverse to the Unit 1 Reactor Building when the door on the Unit 1 Reactor Building side opened. After this incident , the airlock indication was tested and all equipment checked satisfactorily.
With both airlock doors open simultaneously, Secondary Containment was briefly inoperable due to failure to meet Surveillance Requirement (SR) 3.6.4.1.3. This event was reported in accordance w i th 10 CFR 50.72(b)(3)(v)(C) as a condition that could have prevented fulfillment of a safety function (EN 51750). The condition also requires a Licensee Event Report (LER) in accordance with 10 CFR 50.73(a)(2)(v)(C).
CAUSE OF EVENT The direct cause has been determined to be random occurrence.
ANALYSIS/SAFETY SIGNIFICANCE The actual consequence was a brief entry into Technical Specification 3.6.4.1 and an eight hour notification of the event to the Nuclear Regulatory Commission (NRC). 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).
The r efore, 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 3 66 (11-2 015)
Pag e 3 of 3 NRC FORM 366A 1 1-20 1 5) U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2018 LICENSEE EVENT REPORT (LER) CONTINUATION SHEET Es tim a t ed bu r den per respo n se to co m ply wi lh t his m a n datory collec ti on r e q uest: 8 0 h ou r s. R epo rt e d lessons l ea rn e d a r e incorpo r a t e d in t o t he l i ce n sing process and l e d back to i n dustry. Se nd co mm e nl s re g a rd i ng bur de n es lim a t e t o t he FO IA , P rivacy a n d lnl orma ti o n Col l ectio ns B r a n c h (T-5 F 53). U.S. N uclear R eg ul alory Co mmi ssio n , Washinglon, DC 20555-0001, o r by i nl erne l e-ma il to l n foco ll ecls.Reso ur ce@nr c.gov, a nd to lh e D esk O ff ice r , Office o f Inf ormat i o n and R egu l a t o ry A ff airs, NEO B-1 02 0 2, (3 1 50-0 1 04), O ffi ce of M anage m e nt an d B ud ge t , W as hin g t o n , DC 20503. If a m ea n s used l o im pose an i n f o rm ation collec ti o n does not d isplay a c u r r enlly va l i d OMB con l ro l nu mber, the NR C m ay n o t co ndu c t o r spo n so r, a nd a p e r s on i s n ot r e quired t o r espo nd t o , lh e inf o rm a li o n collec li o n. 1. FACILITY NAME 2. DOCKET NUMBER 3. LER NUMBER Y E AR I SEQ UENTI A L I R EV NUMB E R N O. Susquehanna Steam Electric Station , Unit 1 05000387 2016 -001 NARRATIVE CORRECTIVE ACTIONS Although there were no identified human performance errors , a number of actions have been taken to improve human performance associated with airlock doors; these include the following:
: 1. A plant communication was prepared and disseminated describing proper actions associated with airlock doors and plant personnel were briefed on its content. -00 2. A station briefing sheet on airlock door operation has been added to the new to nuclear/Susquehanna supplemental worker Dynamic Learning Activity.
: 3. Supervisor observations of airlock door operation were completed. PREVIOUS SIMILAR EVENTS The following are recent LERs involving loss of secondary containment due to door issues: LER 50-387(388)/2015-011, "Secondary Containment Declared Inoperable Due to an Airlock Door that Had Not Been Properly Latched", dated January 29, 2016. LER 50-388(387)/2015-006-00, "Secondary Containment Declared Inoperable Due to Secondary Containment Boundary Door 1 04-R Breached", dated September 18 , 2015. LER 50-387/2015-004-00, "Secondary Containment Inoperable due Secondary Containment Boundary Door Found Ajar ," dated June 25, 2015. LER 50-388/2015-002-00, " Secondary Containment lnope r ability Due Failure to Meet Technical Specification Surveillance Requirement 3.6.4.1.1
," dated May 11, 2015 LER 50-388(387)/2014-001-00, "Both Doors of a Secondary Containment Airlock Momentarily Open Due to a Personnel Error Resulting in Entry i nto Secondary Containment Technical Specification Limiting Condition for Operation," dated December 31, 2014 LER 50-387(388)/2014-002-00, "Secondary Containment Door Found Ajar," dated April9, 2014. NRC FORM 366 (11-2 015)
APR 18 2016 Jon A. Franke Susquehanna Nuclear, LLC Site Vice President 769 Salem Boulevard Berwick, PA 18603 Tel. 570.542.2904 Fa x 570.542.1504 Jon.Franke@TalenEnergy.c om U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 SUSQUEHANNA STEAM ELECTRIC STATION LICENSEE EVENT REPORT 50-387(388)/2016-001-00 UNIT 1 LICENSE NO. NPF-14 UNIT 2 LICENSE NO. NPF -22 PLA-7453 TALEN-6 ENERGY 10 CFR 50.73 Docket No. 50-387 50-388 Attached is Licensee Event Report (LER) 50-387(388)/2016-001-00.
The LER repmis an event involving Secondary Containment being declared inoperable due to both doors of an airlock being open at the same time. This event was determined to be repmiable 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 . . 'A. Franke /
 
==Attachment:==
 
LER 50-387(388)/2016-001-00 Copy: NRC Region I Mr. J. E. Greives, NRC Sr. Resident Inspector Ms. T. E. Hood, NRC Project Manager Mr. M. Shields, PA DEP/BRP NRC FORM366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2018 (1 1-20 1 5) .. ,.,(!,.( E s tim ated bur den per r esponse t o com pl y wit h thi s manda t ory co ll ect i o n req u est: 80 ho u rs.
Reported l esso n s l ea rn ed are in co rp o r ated in to t h e lice n si n g pr ocess an d fed back to i n dustry. Z' LICENSEE EVENT REPORT (LER) Send co mm e nt s r ega r di n g bur de n es tim a t e to t h e FO IA, Pri vacy and Inf or m a ti o n Co ll ections ...... ... <0'.: B r anc h (T*5 F5 3), U.S. Nu c l ear R eg ul a t o ry Co mmi ssio n , W as h i n g t on, DC 20555-000 1, or b y (See Page 2 for required number of inte rn et e-m a il to l nfocollec t s.Reso ur ce@nrc.gov, and t o the Desk Officer, Off i ce of I nfor m a t io n and digits/characters for each block) R egula t ory A ffa ir s, NEOB*1 0202, (3 1 50-0 1 04), Office of Management an d B u dget, Was hin g t on , DC 20503. If a m ea n s used t o i mpose a n i n fo rm ation collection d oes not disp l ay a c ur re n tly val i d OMB co ntr o l nu m b er, t he N R C may n ot co n d u ct or sponso r, a nd a perso n is not r eq u i r ed t o r espo n d to, the i n fo nm atio n collec ti o n. 1. FACILITY NAME 2. DOCKET NUMBER r* PAGE Susquehanna Steam Electric Station Unit 1 05000387 1 of 3 4. TITLE Secondary Containment Declared Inoperable Due to an Airlock Doors Open Due to Random Occurrence
: 5. EVENT DATE 6. LER NUMBER 7. REPORT DATE 8. OTHER FACILITIES INVOLVED Y EAR I SEQUENTI A L I REV FA C ILITY NAME D OCK ET NUMBE R M O NTH D AY Y EAR M O NTH D AY Y EA R Susquehann a Steam Ele c tri c St a tion Unit 2 05000388 NUMBER N O. Olf-18' FA C ILIT Y NA M E D OCK ET NUMBER 02 22 2016 2016 -001 -00 2016 05000 9. OPERATING MODE 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR &sect;:(C he c k a ll that apply) D 20.2201(b) D 2 0.2203(a)(3)(i) D 50.73(a)(2)(ii)(A) D 50.73(a)(2)(viii)(A) 1 D 20.2 2 01(d) D 20.220 3 (a)(3)(ii) D 50.7 3 (a)(2)(ii)(B)
D 50.73(a)(2)(viii)(B)
D 20.220 3 (a)(1) D 2 0.2 20 3 (a)(4) D 50.73(a)(2)(iii) D 50.7 3 (a)(2)(i x)(A) D 2 0.2 203(a)(2)(i)
D 50.3 6 (c)(1 )(i)(A) D 50.73(a)(2)(i v)(A) D 50.7 3 (a)(2)(x) D 2 0.2 203(a)(2)(ii) D 50.3 6 (c)(1 )(ii)(A) D 50.7 3 (a)(2)(v)(A) D 73.71(a)(4)
: 10. POWER LEVEL D 2 0.22 03(a)(2)(iii) D 50.3 6(c)(2) D 50.73(a)(2)(v)(B)
D 7 3.71(a)(5)
D 20.2 20 3 (a)(2)(iv)
D 50.46(a)(3)(ii) l:8l 50.7 3 (a)(2)(v)(C)
D 7 3.77(a)(1) 092 D 2 0.220 3 (a)(2)(v)
D 50.73(a)(2)(i)(A)
D 50.73(a)(2)(v)(D)
D 7 3.77(a)(2)(i) D 20.2203(a)(2)(vi)
D 50.7 3 (a)(2)(i)(B)
D 50.7 3 (a)(2)(vii)
D 7 3.77(a)(2)(ii)
D 50.73(a)(2)(i)(C) 0 OTHER S p ec i fy in Abs tr ac t be l ow o r in N RC F orm 366 A 12. LICENSEE CONTACT FOR THIS LER LI C E NS EE CO NT AC T r ELE PHON E NU MER (I nclude A r ea Code) C. E. Manges , Jr., Senior Eng i neer-Nuclear Regulatory Affairs (570) 542-3 089 13. COMPLETE ONE UNE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT CAU S E SYS TEM CO MP O NENT MANU-REP O RTABLE C AUSE S Y STEM M ANU-REPORTABLE FA C TU R ER T O EP IX FA C TURER TO EPI X 14. SUPPLEMENTAL REPORT EXPECTED 15. EXPECTED M O NTH DA Y Y EAR D YES (If y e s , complete 15. EXPECTED SUBMISSION DATE) I:8J NO SUBMISSION DATE A B S TRA C T (Li mit t o 1 40 0 s p aces, i.e., a p p r ox imatel y 1 5 sing l e-s p ac ed typ ewritten lin es) On February 22, 2016 at approximately 1345 , a contract employee leaving the Unit 1 Reactor Building swiped his keycard and received a green light to enter the airlock. Upon opening the airlock door, he discovered two Susquehanna employees entering the airlock from the opposite side. The statement from the Susquehanna employees indicates that the green light to enter the airlock was observed.
They were entering the airlock to traverse to the Unit 1 Reactor Building when the door on the Unit 1 Reactor Building side opened. After this incident, the airlock indication was tested and all equipment checked satisfactorily. With both airlock doors open simultaneously , Secondary Containment was briefly inoperable due to failure to meet Surveillance Requirement (SR) 3.6.4.1.3.
This event was reported in accordance with 10 CFR 50. 72(b)(3)(v)(C) as a condition that could have prevented fulfillment of a safety function (EN 51750). The condition also requires a Licensee Event Report (LER) in accordance with 10 CFR 50. 73(a)(2)(v)(C).
The cause of the event was determined to be random occurrence.
There were no corrective actions required to address the cause. Although human performance issues were not involved, actions have been taken to improve human performance associated with airlock door use. There were no actual consequences to the health and safety of the public as a result of this event. NR C FORM 3 66 (1 1-2 015)
Page 2 of 3 NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2018 1 1-20 1 5) 1. FACILITYNAME LICENSEE EVENT REPORT (LER) CONTINUATION SHEET Susquehanna Steam Electric Station, Unit 1 NARRATIVE CONDITIONS PRIOR TO EVENT Unit 1 -Mode 1, 92 percent Rated Thermal Power Unit 2 -Mode 1, 1 00 percent Rated Thermal Power E stima t e d burden per r esponse to comp l y wit h th is ma n datory co ll ec ti on r e qu est: 80 hou r s. R eported l esso n s l earned are i n corpo r a t e d i nt o th e li ce n sing p rocess a nd f e d back t o in dus try. Se nd co mm e nt s r ega rding burd e n es timat e t o th e FOI A, P rivacy a n d Inform a ti o n Co ll ec ti o n s B r an c h (T*5 F 53), U.S. Nuc l ea r Re g ul atory Commiss i o n , Washi n g t on, DC 20555*000 1 , or b y int e rn e t e-m a il to l n f oco ll ects.R esou r ce@nr c.gov, a n d t o th e D esk Office r , Office of In f or m a ti o n a n d R eg ul atory A ffai r s, N E OB-10202, (3 1 50-0 1 04), Office o f Ma n a g e m e nt a n d Budget, W as hin gto n , D C 20503. If a m eans used to im pose a n i nf o rm a ti on co ll ec ti o n does not display a c urr en tl y v al i d O MB co ntr ol numb e r , the N R C m ay not con du ct or sponsor, a nd a pe r son is n o t requ ir e d to r espo nd t o, the i n forma t ion co ll ect i on. 2. DOCKET NUMBER 3. LER NUMBER YE A R I S E QUE N T I A L I R E V NU MBER NO. 05000387 2016 -001 -00 There were no structures, systems, or components that were inoperable at the start of the event that contributed to the event. EVENT DESCRIPTION On February 22, 2016 at approximately 1345, a contract employee leaving the Unit 1 Reactor Building [EllS System Identifier
: NG] swiped his keycard and received a green light [EllS Component Identifier:
IL] to enter the airlock [EllS Component Identifier:
AL]. Upon opening the airlock door [EllS Component Identifier:
DR], he discovered two Susquehanna employees entering the airlock from the opposite side. The statement from the Susquehanna employees indicates that the green light to enter the airlock was observed.
They were entering the airlock to traverse to the Unit 1 Reactor Building when the door on the Unit 1 Reactor Building side opened. After this incident , the airlock indication was tested and all equipment checked satisfactorily.
With both airlock doors open simultaneously, Secondary Containment was briefly inoperable due to failure to meet Surveillance Requirement (SR) 3.6.4.1.3. This event was reported in accordance w i th 10 CFR 50.72(b)(3)(v)(C) as a condition that could have prevented fulfillment of a safety function (EN 51750). The condition also requires a Licensee Event Report (LER) in accordance with 10 CFR 50.73(a)(2)(v)(C).
CAUSE OF EVENT The direct cause has been determined to be random occurrence.
ANALYSIS/SAFETY SIGNIFICANCE The actual consequence was a brief entry into Technical Specification 3.6.4.1 and an eight hour notification of the event to the Nuclear Regulatory Commission (NRC). 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).
The r efore, 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 3 66 (11-2 015)
Pag e 3 of 3 NRC FORM 366A 1 1-20 1 5) U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2018 LICENSEE EVENT REPORT (LER) CONTINUATION SHEET Es tim a t ed bu r den per respo n se to co m ply wi lh t his m a n datory collec ti on r e q uest: 8 0 h ou r s. R epo rt e d lessons l ea rn e d a r e incorpo r a t e d in t o t he l i ce n sing process and l e d back to i n dustry. Se nd co mm e nl s re g a rd i ng bur de n es lim a t e t o t he FO IA , P rivacy a n d lnl orma ti o n Col l ectio ns B r a n c h (T-5 F 53). U.S. N uclear R eg ul alory Co mmi ssio n , Washinglon, DC 20555-0001, o r by i nl erne l e-ma il to l n foco ll ecls.Reso ur ce@nr c.gov, a nd to lh e D esk O ff ice r , Office o f Inf ormat i o n and R egu l a t o ry A ff airs, NEO B-1 02 0 2, (3 1 50-0 1 04), O ffi ce of M anage m e nt an d B ud ge t , W as hin g t o n , DC 20503. If a m ea n s used l o im pose an i n f o rm ation collec ti o n does not d isplay a c u r r enlly va l i d OMB con l ro l nu mber, the NR C m ay n o t co ndu c t o r spo n so r, a nd a p e r s on i s n ot r e quired t o r espo nd t o , lh e inf o rm a li o n collec li o n. 1. FACILITY NAME 2. DOCKET NUMBER 3. LER NUMBER Y E AR I SEQ UENTI A L I R EV NUMB E R N O. Susquehanna Steam Electric Station , Unit 1 05000387 2016 -001 NARRATIVE CORRECTIVE ACTIONS Although there were no identified human performance errors , a number of actions have been taken to improve human performance associated with airlock doors; these include the following:
: 1. A plant communication was prepared and disseminated describing proper actions associated with airlock doors and plant personnel were briefed on its content. -00 2. A station briefing sheet on airlock door operation has been added to the new to nuclear/Susquehanna supplemental worker Dynamic Learning Activity.
: 3. Supervisor observations of airlock door operation were completed. PREVIOUS SIMILAR EVENTS The following are recent LERs involving loss of secondary containment due to door issues: LER 50-387(388)/2015-011, "Secondary Containment Declared Inoperable Due to an Airlock Door that Had Not Been Properly Latched", dated January 29, 2016. LER 50-388(387)/2015-006-00, "Secondary Containment Declared Inoperable Due to Secondary Containment Boundary Door 1 04-R Breached", dated September 18 , 2015. LER 50-387/2015-004-00, "Secondary Containment Inoperable due Secondary Containment Boundary Door Found Ajar ," dated June 25, 2015. LER 50-388/2015-002-00, " Secondary Containment lnope r ability Due Failure to Meet Technical Specification Surveillance Requirement 3.6.4.1.1
," dated May 11, 2015 LER 50-388(387)/2014-001-00, "Both Doors of a Secondary Containment Airlock Momentarily Open Due to a Personnel Error Resulting in Entry i nto Secondary Containment Technical Specification Limiting Condition for Operation," dated December 31, 2014 LER 50-387(388)/2014-002-00, "Secondary Containment Door Found Ajar," dated April9, 2014. NRC FORM 366 (11-2 015)}}

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