ML17173A927

Forwards LER 79-039/03L-0

ML17173A927
Person / Time
Site:	Dresden
Issue date:	06/15/1979
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A928	List: ML17173A927 ML19270H019
References
79-485, NUDOCS 7906220365
Download: ML17173A927 (5)

Text

Commonwealt9dison .\..*

Dresden Nuclear Power Station

• .* R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr //79~485 James G. Keppler, Regional Director 3Y~ -* *- -- --

Directorate of .Regulatory Operations - Region III

--~~ ....

~ _Jfuf~ii-:S"'Jl3.~ulato_ry Commission c ..::.7.99

___ Roosevelt

.....,...,.~----_,J ---......__--~

. . . .__.'Road Glen Ellyn~ IL 60137 Reportable Occurrence Report /179-039/03L-0, Docket 11050-237 is hereby submitted to your office in accordance with' Dresden Nuclear Power Station Technical Specification 6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for operation.

. .. . ():tLl>J f!,h;;L.

0A"-: B. B.- Stephenson *

[y Station Superintendent Dresden Nuclear Power Station BBS:gp

.Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC

\ 1 g i979

(7--~71. . . .. ACaJSEE EVEi'J.\f REPORT .

. -- - -~*--:""*

CONTROL BLOCK:

I~ 10 6 \.V ., *, !P:EAse. PRINT ~RTVPE ALL lau1 RED INFORMATl.ONI

~ *1 1 1L I.D I R I s 12 101 ° I 0 1- I 0 I 0 I 0 I 0 I - I 0 I 0 I 101 4 11 11 11 1~01 I f© 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE ;JO . 57 CAT 58

..:.CON.';:T__ _

[ITiJ  :~~~~~ L.::J©I 0 I s I o I o Io 12 13 I 7 101 o I s I 2 I a I 7 9 I© I o I 6 I 1 I sI 7 I 9 L@~

7 8 60 61 DOCl~ET NUMBER 68 69 EVENT DATE 74 "/5 REPORT DATE 80 EVENT DESCRIPTION ArJD PROBABLE CONSEQUENCES@

I During normal operation, the 125V DC switch No. 2, "Reserve Feed, Bus 22,"

.!ITIJ was opened during ground checks on Unit 2 turbine building main bus. As 1

CQID _la result, 2B2 recirc. MG set oil pump tripped, followed by a trip of the 2B

[QJTI jrecirc. MG set. The A MG set speed was reduced <65% as required by the Technical

~ specifications .(Sec. 3.6.H.4). No Technical Specifications for the.reactor 1

.[I]}] _(parameters were exceeded, and, therefore the safety significance of this event was minimal.

C2JI::I~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

7 8 !i 80 SYSTEM CAUSE CAUSE

• COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUB CODE

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7 8 IC IB I@ l!J@ w@ le IKIT IB IR IK ,qI@

9 10 11 12 13 W ..LzJ@

19 *20:

SEQUENTIAL OCCURRENCE REPORT REVISION

"{.::;\ LE R/RO CVEC'JT YEAR REPORT NO. COL>[ TYPE NO.

0 REPORT NUMBER I I I 21 7 9 22

• l.=J 23 .

I oI3 I 9 I 24 26 J/I 27 lo I 3 J 28 29 w

30 l_QJ 32

• ACTION FUTURE EFFECT I o I o I o l~ I ~@

SHUTDOWN ATTACHMENT NPRD-4 PRIME C.OMP. COMPONENT

TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER LB@~@

33 34 l!:J@

35

. ~

36 37 l.!J@ lU@

43 .

I cI 7 / 7 I QJ@

40 41 42 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

[JJ=2J. I Opening switch 11.2 resulted in a loss of control power to the 2B recirc. MG J

• DJTI J ,set .causing _i,t ~to _,tr-ip. .S~i.tch 112 was reclosed immediately~ and 2B recirc .* MG set

[T[i] J restarted. Switch 112 was marked to caution against opening. No similar event I encountered in the *past.

[III]. '--~-'--~~~~~~~~~~~~~~;._~_.._~~~~~~~~~~~~~~~~~~-~

7 8 9 80 FACILITY ST.8TUS  % POWER OTHER STATUS METHOD OF DISCOVERY DISCOVERY DE_SCR_IPTION f2TIJ L:J@ I 0I 91 6 l@).__I__N_A_ _ __ ~@I Operator observation

• 8 9 10 12 11 44 45 46 80

• . ACTIVITY *CONTENT ~

RELEASED OF RELEASE AMOUNT OF ACTIVITY. . LOCATION OF REL.EASE @

11 I~~@) ~@I NA . NA 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES f,;;\

NUrABER ,,;:;.. TYPE . DESCnlP°TION ~

lII2J .I 0 I 0 I 0 l0L:J@L--____N_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ~

8 9 11 12 13 . 80 PERSONNEL INJUntES (,":;\

J 611 /1\ / * ----i l 0 "°1 1. ]._

IiLJ I 0 I 0 I 0 J@ DESCRIPTION~

8 __ 9 NUMREn

. 11

' . NA { I

~12-----------------------'------------------------'80 l)I lO ~ 0\ ;_; J LQ;.5 OF OR DAMAGE: TO F/,C1tiTY f'43\

TYPE DESCntPTION ~°V LiJ 9 eJ 9 L:J@ 1'-0------------~--,--------------------*----~~---~---'co NA PU£1LICITY (;;;\ NRC: USE ON L V IS~i:tED DESCntPTION . "'

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G9LLLL I I I I I I . I IJ ~ 80*;::

Atif A. Ammar 421 0 NAME OF ? n F . P A R E R - - - - - - - - - - - - - - - - - - PHO~-JE: ~ _j

Commonwealtilltison Dresden Nuclear Power Station "

R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 June 12, 1979 . --*----

BBS LTR 1179-4 72 James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report /179-034/0lT-0, Docket 11050-237 is hereby submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.l.(b), operation of. the unit or affected systems when any parameter *or ope_ra.tion subject to a limiting condition is less conservative than the least conservative aspect of the limiting condition for operation established in the technical specifications.

~lYJ.~

J.A-.. ~B. B. Stephenson

• tr'-, Sta.tion Superintendent

• Dresden Nuclear Power Station BBS:lcg Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC 110&?J..0037D

~

• t\oO ~\

~ \ \

LICENSEE EVENT iiEPORT C(Y.: L'-;;)I. BLOCK:

\.

.___.__.___,__..___.__~ ~ . (t\.EASc PRINT OR TYPE*ALL &IRED INFORMATION) tEl W_r,J_D 8 9 IR UC.'-l*iSEE CODE Is I 2 101 14 15 0 I 0 I _:I 0 I 0 I 0 I 0 I 0 LICENSE NUMllER I - .I 0 I 010l!t_Ll_l 1 11 25 26 LICENSE TYPE Ii JO 101 I 10 57 CAT 58 .

~ON'T

[DJ ~~~~~I~~ ~G)IO IS 10 10 10 12 13 17 IG)LOI SI 31 01 7191@1Ol6I1 I 217 !9 l@ __

8 GO 61 DOCKET NUMBER . 63 69 EVENT DATE 74 75 REPOriT DATE . . 80 - ._ _......__

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (,OJ .

I On 5/24/79 with Units 2 and 3 in ste~y state operation, U 2/3 DG failed to start

~ I during operability test subsequent to finding a LPCI injection valve inoperable. On ili:ITI I S/30/79, similar event occurred when D 2/3 DG failed to start during operability test

@J}J I after* D2 DG was declared inop. U3 DG was immediately proven operable. Shutdown of

'.QJTI I U2 was initiated immediately. Safety significance minimized since off site power was available at all times.

[ill

~8 9 SYSTEM CODE CAUSE CODE CAUSE SUBCODE COMPQNENT CODE - COMP.

SUB CODE VALVE SUB COD!::

80

[IT]'* IE IE I@ LU@ L!U@ Ll!J_o I TI o I RI x I@ ~ LU@

8* 9 10 11 12 13 ' 18 . 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION

@ CER/ROCVENHEAe REPORT r,o, *.:: *CODE TYPE NO.

REPORT NUMi3ER l 7I 9J l::::.I I o I 31 4j L2J I o 11 J L2:.J l.=J ~

21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN {22) ATTACHMENT NPRD-4 PRIME COMP. COMPONENT rrEtl@l~ I@

33 34 0

OrL;I@

35 MrAI 36 . 37 0 I Haro~ I 40 SUjMYI@

41 FORM :;ur..

~

42

.SUPPLIER

[~@

43 MANUFACTUllER l I Io 11 1s J 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

~oth events were failure to engage of lower*air* startbendix gear. After

~l_f_a_i_l_u_r_e_o_n_5_-_2_4_,_2_/_3_D_G_s_u_c_c_e_s_s_f_u_l_l_y_s_t_a_r_t_e_d_3_*_t_i_m_e_s_.__A_f_t_e_r_2_n_d_.f_a_i_l_u_r_e_________.l.

IIIJ l lower start motor replaced. Failure. to.engage occurred several times in

.IIIJ l past. Mod. in progress to install multiple air start attempt circuitry.

J:ID I In interim, gear alignment will be checked after every test of 2/3 DG. J 8 9 80 f:3Q\

m

. FACILITY METHOD OF

~ *. DISCOVERY D!;.SCRIPTION (:j2'\

STATUS

~@

• 16 POWER I0 I 9 19 J@)I OTHEll STATUS U3 at 99% . .J DISCOVERY

~@I Operability te,st at ter U2 t5ft; Failure  !

8 9 10 12 1'l 44 45 46 80

. ACTIVITY CONTENT ,Q\

IEJRE,LE~IE@F.r~Ll@ ...1_ _~;..:...;1_~_u_N_T_o_F_A_C_T1_v_1r~Y-~_3_5__. . LOCAT.ION OF RELEASE @

I N/A B 9 10 11 44 45 f\O PERSONNEL EXPOSURES r:;;::.,

NUMBER (.;'::;\ TYP[ OESCRlr*TION DJe I ol oj oJ6W@L__. N/A

'----~-------~-----~-~-~-----~-------J 9 11 12 13 80 c::: (J I . \ 0 0 '2. 7. J PERSONNEL INJURIES ~

• NUMBER DESClllPTIOt~ 41 .

IE] I ol ol oJ~l~~N_A*~~-~~~'*-~~~-*-*~*~-*-*~~~~~~

8 9 11 12 BO LOSS OF OR DAMAGE TO FACILITY '4°31 **"*

TYP[ DESCRIPTION '.:::.::,)

ZEl R l2J@L 9 10 N/A .

GO

. PUOl.1".:ITY *(;';:\

NRC USE ONLY ISSIJEL'%-:;\ DESCRIPTION~

fiJ L!Jol i::

N/A IJ_Jj_J_J_J_J_JJ_i_LJ ~

9 10 68 69 8U* O'.

J. Chan X-421 0 PHQN~-- ---------:-=,---- 0.

ATTACHMENT TO LJCENSEE EVENT REPORT 79-03.4/0lT-0 COMHONWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT ILDRS2 DOCKET # 050-237 On 5/24/79 with both Units 2*and 3 in stu:idy state operation, the U 2/3 D/G failed to start during a test to prove operability subsequent

• to f.inding a LPCI injection valve inoperable. It was observed that the lower bendix gear butted tooth to tooth with the ring gear ie failed to engage. A second start innnediately following the failure was sue-

. cessful. Tests performed by maintenance personnel could not repeat the gear abutment. However, on 5/30/79, a simiiar event occurred .when U2/3 D/G failed to start during an operability test following a fail-ure* of the U2 D/G to properly shutdown (R.O. #79-37/03L-0). U3 was

• . inunediately proven operable and an orderly shutdown of Unit 2 connnenced ..

The safety significance of this event was minimized since off site power

• was available at all times.

Both events were caused by the-failure to engage of. the lower air

• start bendix gear. Following the first failure on 5/24/79, 2/3 D/G was

• successfully started three times. The failure could not be duplicated.

After the second failure, the lower air start motor was replaced. It was taken apart and inspected, but no abnormality could be found.

Failures of these motors to engage has occurred in the past.

As a result of these earlier failures the station contacted the vendor to seek a corrective action to prevent recurrence of the ai~ start

. motors failing. to engage_'.

0 As a result of that investigation, a modification is pending to

• the air start circuitry to add a multiple start feature.

The-modified system will function by making several attempts at air start motor engagement, before the starting sequence is lock.ed out. The present system only allows one attempt before the start cir-cuitry locks out on "FailureTo Start". Installation of the modifi"'-*

cation will be completed as soon as all parts are available.* The frequency of operability testing for the 2/3 DG has beeh increased to weekly . for one month to assure proper operation. In addition, after each start of the diesel for surveillance testing and until the air start modificat.ion is complete, proper alignment of the air start pinions is being verified in accordance with an approved station procedure~