ML17252B525

LER 78-030/01T-0 for Dresden, Unit 2 Re During Startup Operation, the a LPCI and Core Spray Subsystem Were Inadvertently Rendered Inoperable

ML17252B525
Person / Time
Site:	Dresden
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: ML17252B525 (3)

Text

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• Commonwe. Edison Dresden Nuclear wer Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 May 12, 1978 BBS Ltr /178~828 James G. Keppler, Regional Director*

Directorate.of.Regulatory Operations - Region III U.S. Nuclear.Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137.

Repor~~ble;Otcurrence Repo~t ff78~030/01T-0 Docket 11050-237 is hereby submitted *to your office in accordance.with Dresden Nuclear Power Station Technical Specification 6.6.B.l.(f), personnel error which prevents ~r could prevent, by itself, the fulfillment of.the functional requirements of . syste!Tls required. t6 .cope with accidents analyzed in. the SAR.

• St phenson*.

Statio.n Superintendent*

Dresden Nuclear Power Station

. BBS/deb*

• Enclosure*

cc: Director of Inspectiofi & Enforcement*

Director of Management Information & Program Control File/NRC

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NRC FORM 366  :,,, .. U.S .. NUCLEAR REGULATORY COMMISSION.

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• LICENSEE EVENT REPORT

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• 1- 2..1 1_LRlG) 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES@ .

I During Unit .2 startup operations the "A" LPCI and Core Spray Subsystems were

[ITIJ inadvertantly tendered inoperable. At this time preparations were in progress on

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!Im. J. determined that the. eqtdprr.ent attendant had closed. the "A" and "B" LPCI pump and "A"

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• Core Spray Pump. Manual Discharge ValVes on* Unit 2 instead of Unit 3. L

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Upon discovery.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 ITITI I returned to. their normally locked open position and verified by 0420 hours0.00486 days <br />0.117 hours <br />6.944444e-4 weeks <br />1.5981e-4 months <br />. In IJ:TIJ I addition the "A LPCI and "A" Core Sray Subsytems were satisfactorily flo~ tested. I IJJIJ 1 ** Normal Unit 2 startup then continued *. Personnel involved were admonished for OJI] their error.

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~ .""). j ATTACHMENT TO LICENSEE EVENT REPORT 78-030/0lT-0 COMMONWEAL TH EDISON COMP ANY ( CWE)

DRESDEN UNIT-2 (ILDRS-2)

DOCKET 11050-237 During normal Unit 2 startup operations at 0005 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.s on April 28, 1978 the "A" Low Pressure Coolant Injection (LPCI) and "A" Core Spray. Subsystems were inadvertantly rendered inoperable. At*the time* of the event prep*arations were in progress (DOS 6600-6) **

on Unit 3 while in the shutdown condition for the Emergency Core Cooling System (ECCS) undervoltage 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 0420hours the Unit 2 manual discharge valves were returned to their normally locked open position and verified'. In .

addition the "A" LPCI and. "A" Core Spray S~bsystems were satisfactorily flow tested. Unit 2*startup operations continued. During the approximate four (4) hour interval. when the Au LPCI and Core Spray Subsystems were inoperable the remaining two*(2) LPCI*

pumps ~ere available to fulfill the Containment Cooling Function.

• In additio11 the redundant 100% capacity Core Spray System was availkble*tb

. provide sufficient core cooling in the unlikely event of a loss of coolant accident. There are no previous events of a similar nature at Dresden~

A subsequent review of the event with the appropriate operations personnel revealed that the. Equipment Attendant (EA) assigned to

.Unit 3 for specific valving operations involving the ECCS test mistakenly closed the three discharge valves.discussed previously on Unit 2

• the personne:i, involved were admonished regarding* the{r errors.

At this time, -an investigative .committee ha*s been assigned to fur'ther

--i~~~stigate th~ event and provide recommendations to prevent .. *a.

• re.Qccurence.

A supplemental report will . be sub.mittea

. . I following .the investigation!

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