ML17252B495

LER 78-043/03L-0 for Dresden, Unit 2 Re During Unit start-up, While Pulling Crd'S to Criticality on Sequence a the RWM Malfunctioned Causing Rod Insert and Withdraw Blocks

ML17252B495
Person / Time
Site:	Dresden
Issue date:	08/25/1978
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR 78-1179 LER 78-043/03L-0
Download: ML17252B495 (2)

Text

Co~monweaAEdison e ~Dresden Nuclea~er R.R. #1 Morris, Illinois 60450 Station Telephone 815/942-2920

• August 25, 1978 ,-3

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BBS LTR #78-1:1,79 n:

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James G, Keppler, Regional Director r:r.:;,

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Directorate of Regulatory Operations - Region III  :::r:~~o

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U,S, *Nuclear Regulatory Connnission  ::v 3m

< -,c; 799 Roosevelt Road (") :j.

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GlerrQEllyn, IL. 60137 µ-i ~:

r Reportable Occurrence Report lf7.8-043/03L-O, Docket 117 hereby suEmitted to your office in accordance with Dresden N =ear -ower Station Tecfmical Specification 6,6,B,2,(D), conditions leading to operation in a degraded mode permitted by a(,lim:lting condition for operation or plant shutdown required by _a limiting condition for oper~tion,

• ep son Station Superintendent Dresden Nuclear Power Station BBS"/ deli Enclosure cc 1 Director. of In_spection & Enforcement*

Director of Management Info~ation & Program Control File/NRG A

• .uG 22 79(8

NRC f::;;~M 366 U. ~- Jtronl:.ltl::flTt:'tTul.~.'rmrv tm.rFJr1SS1{fN 17-7,71" ., ~ .::~:

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CON1ROL BLOCK:

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~* e LICENSEE EVENT REPORT

_.._I_ _,____._ _.l_~l..__-'.!*10 e

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

[ill IIILIDIRISI 21010101-1010101010 I- 10 10 1014 11111111101 7 8 9 LICENSEE CODE 1'1 15 LICENSE NUMBER 25 26 LICENSE TYPE JO I

57 CAT 58 10 CON'.T

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=~~~~~ L!:J© I o I s I o I o I o I 2 I 3 I 1 101 o 11 I 2 1s I1 Is '(VI o ! s 1 2 I s I 75 REPORT DA TE 1 I s 10 80 60 61 DOCKET NUMBER 68 69 EVENT DATE EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES@

I During unit start-up, while pulling CRD' s to cri ticali 1Y on sequence "A" the RWM mal-

[ill] functioned causing rod insert and withdraw blocks, Because the RWM inoperability

[QJTI occurred during*-*the first 12 rod withdrawals, further withdrawals were not permitted

[QTIJ by. rs. 3,3,B,3,b, This event was of no safety significance because the RWM failure

.[TI)) light annunciated and additional rod*pulls were suspended. This is the first report

~ Ll~o_f~an~e_v_e_n_t~o_f~t_hi~s~t~y~p_e_*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-'

_ _ _ _ _ _ __J illTIB 9 BO SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUB CODE SUB CODE

~8 IR I B 10} ~@ ~@ I I I N I s I T I R I u 1@ cu@ LU@

7 9 10 1i 12 13 lB 19 20 SEQUENTIAL OCCUR REN CE REPORT REVISION LER/RO CVENT YEft.R REPORT NO. CODE TYPE NO.

@ REPORT NUMBER I 7 I 7I I oI 4J 3I I.?! Io I 3 I L!J [_Q_J 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN r:;:::,, . ATIACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS ~ SUBMITTED FORM :;us. SUPPLI !OR MANUFACTURER

~@~@ L£J@ ~ I 01 o I o I s J l!!.J@ l!U ~@ . . I44.GI 0 I 8 I 0 I 33 34 35 36 37 40 41 42 43 ~7 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

Tli.e failure of the RWM was caused by a defective digital output re.lay board, Insert/ I withdraw Elocks were eliminated when the RWM was oypassed and the 5 withdrawn coni-rnl J rods were fully inserted. The defective board was replaced and normal unit startup DJIJ I oegan, No further correction needed, rr:EJ8 9 FACILITY '3C)\ METHOD OF BO

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7 8 g w

STATUS 1

10

% POWER a1 a1 a1@1.__N_A_ _ _ ____

12 n OTHER STATUS ~

44 DISCOVERY DISCOVERY DESCRIPTION

~CiVl.__o_p_e_r_a_t_o_r_o_b_s_P__r_v_a_t_i_o_n_____~-----~-1 45 46 32 80

.. ACTIVITY CONTENT ~

RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE @

~ LJ @ l.LJ@._I-"N"'--A'---_ _ _ _ __. NA 8 .g 10 ' 11 44 45 80 PERSONNEL EXPOSURES ~

NUMeER TYPE DESCRIPTION

[!I2J 1010 IOJ@)~@)._____NA___~---------------~~

8 9 11 12 13 80 PERSONNEL INJURIES Q NUMBER DESCRIPTION6

~8 1010101@

9 11 NA.

~12------------------------------------------'BO LOSS OF OR DAMAGE TO FACILITY '4J\

TYPE DESCRIPTION ~

QJ2] ~@ . NA 8 9 10 60 PUOLICITY (.°;:'\ NRC USE ONLY IS$UEDQ DESCRiPTION ~. "'

.fIIIJ l]U~.____ _ _ _ ___.___ NA_ _ _ _ _ _ _ _ _ _ _ ____, I I I I I I I I I I 11. j ~

8 9 10 GB 69 BO* 0:

R,ichard Ralph X-l122 0 0.

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