05000446/LER-2019-002, Automatic Actuation of Auxiliary Feedwater System

From kanterella
Jump to navigation Jump to search
Automatic Actuation of Auxiliary Feedwater System
ML19199A033
Person / Time
Site: Comanche Peak Luminant icon.png
Issue date: 07/11/2019
From: Dreyfuss J
Vistra Operating Co. (VistraOpCo)
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
CP-201900350, TXX-19061 LER 2019-002-00
Download: ML19199A033 (5)
v • d • e


LER-2019-002, Automatic Actuation of Auxiliary Feedwater System
Event date:
Report date:
Reporting criterion: 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown
10 CFR 50.73(a)(2)
10 CFR 50.73(a)(2)(iv)(A), System Actuation
4462019002R00 - NRC Website
v • d • e

text

. U.S. Nuclear Regulatory Commission ATIN: Document Control Desk

  • ENERGY

~!lirxu I m

't* energy Luminant 7/11/2019

SUBJECT:

COMANCHE PEAK NUCLEAR POWER PLANT DOCKET NO. 50~446 AUTOMATIC ACTUATION OF AUXILIARY FEEDWATER SYSTEM LICENSEE EVENT REPORT 446/19-002-00

Dear Sir or. Madam:

John R. Dreyfuss

. Plant Manager Luminant P.O. Box 1002 6322 North FM 56 Glen Rose, TX 76043 o 254.897.5200 Ref 10 CFR 50.73..

Pursuant to 10CFR50.73, Vistra Operations Company LLC (Vistra OpCo), hereby submits the enclosed Licensee Event Report446/19-002-00, "Automatic Actuation of Auxiliary Feedwater System" for Comanche Peak Nuclear.

Power Plant (CPNPP) Unit 2.

ThiscommunicatiOn contains no new licensing.basis commitments regarding CPNPP Unit 2.

6555 SIERRA DRIVE.

. IRVING, TEXAS 75039 0214-812-4600 VISTRAENERGY.COM..

TXX-19061 Page 2 of 2 If you have any questions regarding this submittal, please contact Garry W Struble at (254) 897-6628 or garry.struble@luminant.com.

Sincerely, Enclosure

  • COMANCHE PEAK NUCLEAR POWER PLANT AUTOMATIC ACTUATION OF AUXILIARY FEEDWATER SYSTEM LICENSEE EVENT REPORT 446/19-002-00..

cc.

S.cott Morris, Region IV Natreori Jordan, NRR

  • Reside.nt Inspectors, Comanche Peak

NRC.FORM 366 (04*201ll)

U.~. NUCLEAR REGULATORY qOMMISSION L,ICENSEE EVENT RE:PORT (LER)

(See:Page*2 for required.number ofaigits/charaoters for.each block)

~ _. (See NUREG-1022, R.3. for instruction and guidance for completing this form.

APPROVED. BY 0MB: NO.. 3150:.Q104 EJCPIRES: 03/~1./2020 Eslimate<! burden P."' response ti, co.mply with this m:,i,dalo!y "°llection re guest 80 :houn;.

Reported lessons learned are incorporal!>d into the *licensing process and fed back to lndlJ&IY **, Send comments r~g,..cling burden eslimme to 1he lnform'!fion)lervicies Branch (T-2 ~43), U.S. Nuclear Regulab:lry Commission, Washington, OC.20555-0001, or by e-mail to 11\\focollacts.Resoirrce@tirc:gov, and lo. the* Desk Officer, Office of Information" and*

Raguiatory Affairs, NE~10202, (3159-0104), Office of Management and Budget:

"'+.,

~*l.

!lttRJ_l\\'l\\1Y.WJ]rc.gov/reading*rm/doc~collections/nuregs/staff/sd 022/r3/).

Washington, DC 20503. If a means used to impose. an* 1nloimalion oolleotion does not display a curremly vafid 0MB control number, the NRC may not conduct or sponsor, and a p<>rson Is not required to respond:to, the information oolleci!on:

3._Page Comanche Peak Nuclear Power Plant '

05000 446 1

..OF 3

  • 4. Title Autmnatic Actuation of Auxiliary F.eedwater System
5. Event Date

.6. LER Number

1. Report Date

' 8. Other Facilities Involved Month

, Day*

Year,
  • 1 :
  • Sequential : 1
  • Rev
  • Year..

Number.'

No..

Month

.05 14 2.019 -

00 07 in;.

Year 11 2019 Facility.Name Facility Name.

Docket Number

, 05000 Docket Number.

  • 05000
9. Op~l'atirig Mod~ '.
11. This Report is Submitted Pursuant to the: Requiremerits of 10 CFR:§:.. (Check ail that apply).

.. t d: 20'..22()1(b) tJ. 20.2203(~j(3}(i):

D 50.73(~}(2}(ii)(A)

D 50.73(a)(2i(viii)(A}

_ D 20.2201cd~::'

.,

  • lff 20.220*3caJc1)..
0. 20j203(a)(2?(i)
10. Power level
0 20.2203(a)(2)(ii)

D

  • 20.22osca>c2icm> :

D

  • 20'.2203(a)(~}(iv) 100

[] 20.2~03(a)(2)(v)

D 20.2203(a>c2>(vi> *..

D 20.22os(a)(3}(ii> :.

D 2_0.2203(a><4>

Cf 50.36(c)(1)(i)(Ai:

.. *

  • D sa:36(c)(1)(ii)(A}

o :

~o.sacc><2>

0 50.46(a)(3i(i{..

D 50.73(a)(2)(i)(A) 0

  • 50.73(a}(2)(i}(Bi D 50;73(l;l)(2}(i)(C)

D 50.73(a)(2)(iiJ:CBJ

.... D

  • s{t3(a}(2)(viii)(B). :'

tJ /50.73\\a)(2){i1i) 0 50)3(a)(2)(ix}(A)

  • 0 50.73(a)(2)(iv)(A) tJ so.13(a)<2><;>

D 50.73(a)(2)(~)(A)

D n11ca><4>

.. D 50.73(a}(2)(v)(B)

tJ 1a.11 fa)(Sf :'

D 50.73(a)(2}(v)(Ci

D. 73.77(a>c1~

D. so.73(~><2><~ico, D 1s:t1ca>c2>(i>

D 50.73(~}(2)(vii) *:..

[;) 73.77(a)(2)(ii)

D Other (Spe~ify in Abstract below or in =

I. DESCRIPTION OF THE REPORTABLE EVENT

A. REPORTABLE EVENT CLASSIFICATION.

This event is* reportable under 1 OCFR50.73(a)(2)(iv)(A), "Any event or condition that resulted in manual or automatic actuation of any of the systems listed in paragraph (a)(2)(iv)(B) of this sec;tion.n The system that actuated was the Unit 2 Auxiliary Feedwater System

  • B. PLANT CONDITION PRIOR TO EVENT At 2151 on May 14, 2019, Comanche Peak Nuclear Power Plant (CPNPP) Unit 2 Wp,S in MOOE 1 operating at 100°/o power.

C. STATUS OF STRUCTURES, SYSTEMS, OR COMPONENTS THAT WERE INOPERABLE AT THE START OF THE EVENT AND THAT CONTRIBUTED TO THE EVENT At the start of this event, the Stephenville 138 KV transmission line tp the CPNPP 138 KV switchyard. tripped.

D. NARRATIVE SUMMARY OF THE EVENT, INCLUDING DATES AND APPROXIMATE TIMES At 2151 on May 14, 2019; CPNPP experienced a loss of the Stephenville 138 KV transmissiqn line [Ell~: (FK)(JX)]. This resulted in a transfer of the Unit 2 Safeguards buses to th.e alternate off site power source and an actuation of both Unit 2 blackout sequencers and an automatic start of both Unit 2 Motor Driven Auxiliary Feedwater pumps (MDAFWPs) [EIIS:

(BA){P)] and the Unit 2Turbin~ Driven Auxiliary Feedwater purnp (TDAFWP) [EIIS: {BA)(P)]. The Emergency Diesel.

Generators did not start since they were not required to start due to a successful bus transfer. The MDAFWPs and

  • TDAFWP were returned to automatic. The off site source was recovered at 0256 on May 15, 2019. There was n.o impact onUnit1; E. THE METHOD OF DISCOVERY OF. EACH COMPONENT OR SYSTEM FAILURE, OR PROCEDURAL PERSONNEL ERROR Operators (Utility, Licensed) in the !.Jnit 2 Control Room received al;:1rms relat~d to "Loss Of Startup/Station SE:lryice Transformers."

II. COMPONENTOR SYSTEM FAILURES A CAUSE OF EACH COMPONENT OR SYSTEM FAILURE Not applicable - Th~re were n; component or system failures with any CPNPP GOmponents dufing this event. The loss of thEl StephenviUe 138 KV transmission line was caused by equipment owned by another el~ctric company..

, B. FALU.RE MODE, MECHANISM, AND EFFECTS OF EACH FAILED COMPONENT Not appficable - No CPNPP component *or system failures werEl Identified during this event C: SYSTEMS OR SECONDARY FUNCTIONS THAT WERE AFFECTED BY FAILURE OF COMPONENTS WITH MULTIPLE FUNCTIONS Not applicable - No CPNPP component or system failures w~rEl Identified during this event

D. fAILED COMPONENT INFORMATION

Not applicable - No CPNPP component or system failure~ were iden,tified during this event.

Ill. ANALYSIS OF THE EVENT A. SAFETY SYSTEM RESPONSE$ THAT OCCURRED Th~ Unit 2 s~fegua~ds puses transferred to the alternate off site power source;:both Unit 2 blackou.t. sequencers actu~ted, :

and bot~ Unit 2 MDAFWPs an.d the Unit 2 TDAFWP automaticf!IIY started as design~d,.

  • B. DURATION OF SAFETY SYSTEM TRAIN INOPERABILITY This event i;Jid not invo(ve the inoperability of any safety systems. Off site power is not c*redited in Cliapter 15 ofthe CPNPP,Final Safety Analysis Report, therefore, offsite power is not co~si<:lered a sa~ety system.

C. SAFETY CONSEQUENCES AND IMPLICATIONS OF THE EVENT==.

D\\.ffing this event, the 345kV switch yard was available ;:ind stable. l)nit 2 reduced power to 92 % qtie to AFW a:uto-st1;1rt.

and Unit. 1 was not affected by this event. All plant safety systems responded as desjgned during this event. This event. :

had nci i.mpact on-nuclear safety, reactc:>r safety, ra~iological f;lafety, envi_ronmentar: safety or the.safety=of the public: This ev(;lnt has be~n evaluated to not meet the definition of a safety system functio~J31 failure per 1 O CFR ?O. 7'.3(a)(2)(v).

IV.. CAUSE OF THE EVENT.

The loss of the St.ephenville 138 KV transmission line was ca.used by a fault in the Stephenville switc~yard that is owned by,another electric compf!ny; V. COR~ECTIVE ACTIONS.

The MDAFWPs and the TDAFWP were:returned to automatic. The off site source was recove.red at 025(:fon May Hi; 2019. There were no component or system failures with any CPNPP components during this event. ttowever the off.

site power piovider.to6k.corrective;actions witn regard tq relaying and line isolation toayqid futu.re power lqsses.

VI. PREVIOUS SIMILAREVENTS

Si.milar event y,ias submitted on Jan,t..iary 16, 2019 in Licensee Event Report 446/18~002-~9'..... _.Page

... 3 "*of

Retrieved from "https://kanterella.com/w/index.php?title=05000446/LER-2019-002,_Automatic_Actuation_of_Auxiliary_Feedwater_System&oldid=4924718"