ML17252A290

Transmittal of Reportable Occurrence Report No. 50-249/1977-10

ML17252A290
Person / Time
Site:	Dresden
Issue date:	04/21/1977
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
50-249/1977-10
Download: ML17252A290 (2)

Text

Commonw~ Edison Dresden Nucle~:er Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr4 # 77-342 April 21, 1977 Mr. James G. Keppleri Regional Director Directorate of Regulatory Operation - Region I I I U. ~. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Enclti~ed please find Reportabl~ Occurrence report nµmber 50-249/1977-10.

This report is being submitted to ypur office in accord9rce with the Dresden Nuclear Power' Station Techni.cal Specificat.ions, . Section,-~

. ,6.6.B.

tep nson Station S perintendent Dresden Nuclear Power Station BBS/skm Enc4osure cc: Director of Inspection & Enforcement Director of ManagemeDt !~formation & Program Control Fi le/NRC

. J 7 7 ( "2- 7 0 c) J -,

P.PR 2 6 1977

LICENSEE EVENT REPORT

. co~TAOL BLOCK: ~J , *I.* I I I & s e PRINT ALL REali1REo\io.iFoRMAT10NJ

• • ~

1 6 LICENSEE LICENSE EVENT

. NAME LICENSE NUMBER TYPE TYPE

@E] 1 1 1 ti 0 1 RI 5 '3 I I 01° I~ I o* 1o I o I o I o 1-1 o I 91 I I I I I I I I 0 I 11

=C.~_-.1 - 8. 9 . 14 15 . . .25 26 30 31 32 REPORT REPORT CATEGORY TYPE. SOURCE ~EPORT CATE

• @ElcoN~ I I I L2J ~ 1°1 12 1 2 17171 7 '8 57 .. 58 59 60 75 80' EVENT DESCRIPTION ..

lol 21 I Dl!ring routine calibration checks, undervoltage relays for buses 34-1 and 38 were 7 8 9 lo1 3 1 I found to.be appare~tly inoperative. Relay227-I on bus 34-l appeared to operate 8

l 7 . 8 9 80 (ol 4 11~*--_s_1_u_g_g_i_s_h_l_y_;__r_e_1a_y~-22_7_-_ 1_o_n_._b_u~s--3_8

_ __a_p_p_e_a_re_d__t_o__h_a_v_e__b_e_e_n__a_s_s_e_m_b_l_ed_.__ im_p_r_o~p-e_r_l_Y_*___**_T_h_e_--1I

. ~** 9, V~i(~)On bus 34-l w.as disasse~bJed, cleaned, satisfactorily tested and returned to SO illeJ.* ~-------------------------__.;..~...;..___;._ _-_,,__ _ __JI.

7 8 9 80 (filID-1 service. The relay for bus 38 was reassembled correctly; tested, and returned I

1. 8 9 PRIME (continued) so SYSTEM. . CAUSE COMPONENT COMPONENT*

COOE . CODE COMPONENT CODE SUPPLIER . . MANUFACTURER V10LATllN

@El I 9 B I L!J [-RI E IL JA IV Ix l ~ I G Io 1a I o.1 ~

7 8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION lol 8 1 ( *NA - The~~of the event cannot be definitively established at this time. The I 7 8 9 ~ 80.

(oj 9 j l~.___r_e_s_u_l_t_s__o_f__t_h_e__i_n_v_e_s_t_ig_a_t_io_n__p_r_e_s~e_n_t_l_Y_._u_n_d_e_rw_a_y___w___i1_1___b_e__s_u_b_m_i_t_t_e~d-i_n~a.........f~.*6-~l_:1_o_w_-_u_p__...;;;..._.~I 80

.7ffi§18 9 report.

7 8 9 80 FACILITY METHOD OF STATIJS  % POWER OTHER STATUS DISC~VERY DISCOVERY DESCRIPTION NA NA

[ill]

7 .. 8*

L:J 9

I100 I 0 I 0 12I 13 44 I~

45: 46 I

SQ FORM OF ACTIVITY CONTENT I

w AMOUNT OF .ACTIVITY r~LrSE RELEASED LOCATION OF RELEASE fill] OF 10 11 NA I 44 45 NA 80 7 8 9 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~ 10 I .01 01 ~~* ~-N~A----~------~-__;_--~---~

7 8 9 11 12 13 60 PERS'ONNEL INJURIES .

. NU~.lBER .DESCRIPTION EEJ I 0 ,. 0 I 0 I ~-N__ A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _~.....-...;;;~...;..___;___;.__ _......._ _~

7 8 9 11 12 80 OFFSITE *CONSEQUENCES 1

. NA*

Em~--~----...-:-----_....---

.a 9

_____________. ;________, 80 LOSS OR DAMAGE TO FACILITY Efil w TYPE OESCAIPTIQN NA 7 8 9 . 10 80 PUBLICITY (iEJ NA 7 8 9 80 ADDITIONAL FACTORS

~ I EVENT DESCR I PT t*ON *;~~continued) . to service. The safety implications of 1 a9 80 Eifil '..this event cannot be established at this time. This is not a repetitive occurrence.

£:0 7 8.9 (50-249/1977,.,10)

NAME:-...._ _ _ _ _G_._L_._R_o_m_b_a_____________ PH.ONE: _ _E...,..x_t_,_4_2_1_ __

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