ML17252B526

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LER 78-030/01T-0 for Dresden, Unit 2 Re Tech. Spec. 6.6.B.1(f), Personnel Error Which Prevents or Could Prevent, by Itself, the Fulfillment of the Functional Requirements of System Required to Cope with Accidents Analyzed in the SAR
ML17252B526
Person / Time
Site: Dresden Constellation icon.png
Issue date: 05/12/1978
From: Stephenson B
Commonwealth Edison Co
To: James Keppler
NRC/RGN-III
References
BBS LTR 78-828 LER 78-030/01T-0
Download: ML17252B526 (3)
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Dresden Nucle~~wer Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 May 12, 1978 BBS Ltr 1178-82,8 James G. Keppler, Regional Director Directorate of.Regulatory Operations.,... Ref!;ion III U.S~ Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report 1178-030/0lT-0 Docket ll050f:237 is hereby

  • submitted to your office in accordance with Dres9.en Nuclear Power.Station Technical Specification 6. 6:.B .1. (f), personnel .error which prevents or could prevent, by itself, the fulfillment of the functional requirements of systems required to cope with accidents. analyzed in, the SAR.

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L_..,,, Station Superintendent Dresden Nuclear Power Station BBS/deb Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control

.File/NRC Mt4Y 1 7 1978

NRC FORM :366 l-'* , U.S. NUCLEAR REGULATORY .COMMISSION

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-~ -LICENSEE EVENT. REPORT CONTROL BLOCK: ._I_....____,__....____.__. . _I___.6I Q

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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  • 57 CAT 58 CON'T .

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  • [QJ]J* I During Unit 2 startup operations the* "A" LPCI and Core Spray Subsystems were

-~rladvertantly rendered inoper~ble. At this time preparations were in progress on

[Ifil I* Unit 3 for the -Eccs Undervoltage Functional Test *. Subsequently at 0405 hours it was I determined that. the. ~quipment attehdarit had; closed the riA" and "B". LPCI pump* and "A" Core Spray* Pump Manual* Discharge Valves on Unit 2 *instead of Unit 3 *

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_[II[]* I *Upon discover.y of the personnel error at 0405 hours0.00469 days <br />0.113 hours <br />6.696429e-4 weeks <br />1.541025e-4 months <br /> the pump discharge valves were I ITIIl returned to their normally locked open position .and verified by 0420 hours. In ITTIJ. L---*a_d_d_i-t..;..i_o_ri_*_t_h_e_'_'A_*,_;_L-'--P_c_r_a_n_d_._'*-'A_'_'_c_o_r_e_s_r_a_Y__._s-'..u_b_*_sy'--t_e_m"""s_w_e_r_e_s_a_t_.i_s_f_a_c_t_o_r_i_l.;...y_f_l_o_w_**_t_e_s_t_e_d_._._..,..,

ITIIl I Normal .Unit 2 startup l;~n-~;;µ1i'.riued: Personnel involved were admonished for

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. I, ATTACHMENT TO LICENSEE EVENT REPORT 78-030/:0lT-0 COMMONWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT-2 (ILDRS-2)

DOCKET /1050-237 During normal Unit 2 startup operations at 0005 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> on April 28,

. 1978 the "A" Low Pressure Coolcii:lt.::::-Injection (LPCI) and "A" Core Spray Subsystems were inad.vertantly rendereci inoperable. At the time of the'event preparations were in progress (DOS 6600-6).

on Unit 3 while in the shutdown condition for the Emergency Core Cooling System (ECCS) under'voltage Functional Test. Following initiation of the test, at 0405 hours0.00469 days <br />0.113 hours <br />6.696429e-4 weeks <br />1.541025e-4 months <br /> it was determined that the Equipment Attendant (EA) had closed the "A" and "B" LPCI pump and "A" *Core Spray Pump Manual Discharge Valves on Unit 2 instead of Unit 3. At 0420 hours0.00486 days <br />0.117 hours <br />6.944444e-4 weeks <br />1.5981e-4 months <br /> the Unit 2 manual discha.rge valves were returned to their normally locked open.position and verified. In addition the "A" LPCI and.'}"A" Core Spray Subsystems were satisfactorily flow tested. Unit 2 startup operations continued. During the approximate four (4) hour interval when the "A" LPCI and Core Spray Subsystems were inoperable the remaining two (2) LPCI.

pumps were available to fulfill the* Containment Cooling Function.

In additio.n the redundant .100% Lcapacity Core Spray System was available to provide sufficient core cooling in the .unlikely t.~.Yen-t'.J6ff:a loss of coolant accident. There are* no previous -evetits of a.

similar nature at Dresden.

A subsequent review of the event with the appropriate operations personnei revealed that the Equipment Attendant (EA) assigned to Unit 3 .fqr specific valving operations involving- the ECCS test mistakenly closed the three discharge valves discussed previously,__--'-o on Unit 2. \the personnel involved were admonished regarding

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, _ At*this time, an investigative committee nas been assign~d to ~~~ther I trw:es.tigate the event and provide recommendation.s to prevent a ,

L__ 'J?eQ~G..l}.:r_ence, . A supplemental report wiTI be sub,rni"tt:ee.-*fo*tfowing- *th*e- ---

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