ML17173A944

Forwards LER 79-037/03L-0

ML17173A944
Person / Time
Site:	Dresden
Issue date:	06/22/1979
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A945	List: ML17173A944 ML19248C590
References
79-517, NUDOCS 7907030404
Download: ML17173A944 (2)

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., ... Dresden Nuclear Powe{ Station

• R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920

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June 22, 1979 BBS LTR fl 79-517 REGULATORY DOCKET RLE COPY 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 fl79-037-03L-0, Docket 11050-237 is hereby submitted *to *your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.2.(h); conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for opera-tion.

~~-Station*~Superintendent Dresden Nuclear Power Station BBS:lcg Enclosure cc:* Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC-

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- (PLEASE PRIN; oR TYPE ALL.OUIRED 1NFORMAT10Nl tEJ tili_I n IR Is 1-LJG)I oI o I -I oI o I oI oL n. I ~*I o I o 101 41 ii ii" ii 8 9 LICENSEE COOE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE

~ON'T ffiJ ~~~~~~ W© I 01 sI oI o I o I 2 I 3 I 1 10! oI sI 3 IoI z 9 I© I a I 6 I 2 I 2 I z I 9 I_@~_*____;

8 . 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75

• REPORT DATE* 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@ . *

• I Unit 2 DG differential fault alarm came up after operator closed Bus 24-1 aux cabinet Bii

[IT) . ._I _d_o_o_r_.__A_*_0_h_i_g_h_d_i_f_f_e_r_e_n_t_i_a_l_f_a_u_l_t_r_e_l_a_y_w_a_s_._s_u_b_s_e_q_u_e_n_t_l_y_f_o_u_n_d_t_r_i_P_P_e_d_w_i_t_h __ ta-r_g_e_t_*_:*:,....J*-

~ ..l _u_p_,_w_h_i_c_h_._m_a_d_e_D_/_G_i_n_o_p_.__A_f_t_e_r_r_.e_s_e_t_,_D_/_G__r_a_n_f_o_r_l_h_r_.__iI_o_w_e_v_e_r_i_t_f_a_i_l_e_d_t_o_s_h_u_t_-_ _,

~[5] ..l -d_o_wn__f_r_o_m_c_o_n_t_r_o_1_r_o_o_m_a_f_t,...e_r_t_e_s_t_.__r_t_w_a_s_s_h_u_t_d~o-wn __b_y_p_u_1_1_i_n_g_f_u_e_1_._r_a_.c_k_*_*_2_/3_nl_c __ J failed to start for operability test after declaring D2 DG inop. (R.O. #2-79-34/0!T-0}

EID I 1I2J '--'l~o_r_d_e_r_l_y_s_h_u_t_d_o_wn __ o_f_u_2_*_w_a_s-i_n_i_*t_i_*a_t_e_d_.__s_a_f_e_t_y_s_i_g,_n__i_*f_i_*c_a_n_c_e_m_i_n_i_m_a_l_s_i_n_c_e__ o_f_f_s_i_t_e_ ___;_...J lJ]J .~l-*_P_o_w_e_r_w_a_s_a_v_a_i_*1_ab_l_e_._ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -,--J 8 9 '80 SYSTEM CAUSE CAUSE

• COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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8 9 10 11 12 13 18 .1f!  :.: LO -:-:

SEQUENTIAL OCCUR Fl.f!).':C::L.  ::-m;f'ORT . REVISION Q LER/ROCVENTYEAR REPORT NO. .--~com; .,. ._TYPE NO.*

~ REPORT .

NUMBER t 7* J 9 j l=.l I 0 I 3 j 7J 1>1 I OJ 3j ~ l=:J ~

21 22 23 24 26 27 28 29 30 31 J2 ACTION FUTURE EFFECT SHUTDOWN ~* ATTACHMENT

• NPRD--4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM :;UB. SUPPLlf:R MANUFACTURER

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33 34 35 36 ' 37 40, 41 42 43 44 47 -

xw* 1 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Trip caused by closing aux cabinet door excessively' hard (Diff. curr.* relay mounted__J IID I in door). Personnel cautioned and doors will be labeled to check relays after closing 1

.Im L Failure to shutdown caused by shutdown solenoid out-of-a,djustment. Adjusted* arid ran J IIIJ I successfully. Add. action not-necessary due to singular occurrence.

FACILITY STATUS  % POWER OTHEH STATUS IJQ\

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METHOD OF DISCOVERY . * . DISCOVERY DESCRIPTION

@32 li] UJ@ I 0 I 9 j9  !@)I.__,_..N_/_A_ _* _ __.f. L£J@I Operability Test after D.G. ockout ** .,

'8 9 10 12 13 44 45 .45 60 ACTIVITY . CONTENT ~

RELEASE'.) OF RELEASE AMOUNT OF ACTIVITY ~ LOCATION OF RELEASE @

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[_~l@I N/A ' N/A 8 9 10 PERSONNEL EXPOSURES NUMBER 11 f-::,\ TYPE DESCRIPTION

@ 39 44 45 80

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8 9 11 12 13 80 PERSONNEL INJURIES ~

NUMBER DESCRIPTION 41 liJ 8 I 0 I 0 I 0 J@I 9 11 NI '

~12:--~--~~~--~~~~-~---~---~~~'--~~-~~~~~~~~~-~8~0 LOSS OF OR DAMAGE TO Fl\CILITY 14:3\ .*.

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PUoLICITY ~

ISSUE I D DESCH I PT ION~ .

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