05000339/LER-1982-071-03, /03L-0:on 821027,control Power for B Casing Cooling Pump Found de-energized.Caused by Opened Circuit Breaker Unintentionally Disturbed by Workers.Circuit Breaker Closed & Power Verified

/03L-0:on 821027,control Power for B Casing Cooling Pump Found de-energized.Caused by Opened Circuit Breaker Unintentionally Disturbed by Workers.Circuit Breaker Closed & Power Verified

ML20028A978
Person / Time
Site:	North Anna
Issue date:	11/16/1982
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028A968	List: 05000339/LER-1982-071, Forwards LER 82-071/03L-0 05000339/LER-1982-071-03, /03L-0:on 821027,control Power for B Casing Cooling Pump Found de-energized.Caused by Opened Circuit Breaker Unintentionally Disturbed by Workers.Circuit Breaker Closed & Power Verified
References
LER-82-071-03L-01, LER-82-71-3L-1, NUDOCS 8211290274
Download: ML20028A978 (2)

LER-1982-071, /03L-0:on 821027,control Power for B Casing Cooling Pump Found de-energized.Caused by Opened Circuit Breaker Unintentionally Disturbed by Workers.Circuit Breaker Closed & Power Verified

Event date:
Report date:
3391982071R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

/0/1/

/V/A/N/A/S/2/ (2)

/0/0/-/0/0/0/0/0/-/0/0/ (3)

/4/1/1/1/1/ (4)

/ / / (5)

LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

/0/1/

R O fL/ (6)

/0/5/0/0/0/3/3/9/

(7)

/1/0/2/7/8/2/

(8)

/1/1/ V6/8/2/ (9)

C DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

/0/2/

/ On October 27, 1982, with Unit 2 at 100% power, the control power for the "B"

/

/0/3/

/ Casing Cooling Pump was found de-energized. The Casing Cooling System provides /

/0/4/

/ cold water to the outside recirculation spray pumps to assure that net positive /

/0/5/

/ suction head is available during all accident conditions. The redundant system /

/0/6/

/ was availabic; therefore, the health and safety of the public were not affected. /

/0/7/

/ This event is contrary to T.S. 3.6.2.2 and reportable pursuant to T.S. 6.9.1.9.b./

/0/8/

/

/

TYSTEM

CAUSE

CAUSE COMP.

VALVE LvDE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/

/S/B/ (11)

/A/ (12)

/X/ (13) /Z/Z/Z/Z/Z/Z/

(14)

/Z/ (15) fZ/ (16)

SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

CODE TYPE NO.

.7)

REPORT NUMBER

/8/2/

/-/ /0/7/1/

/ss/

/0/3/

/L/

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a ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

/E/ (18)

/Z/ (19)

/Z/ (20)

/Z/ (21) /0/0/0/0/ (22) /Y/ (23) /N/ (24) /Z/ (25) /Z/9/9/9/

(26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/

/ The circuit breaker for the "B" Casing Cooling Pump was found opened. No reason /

/1/1/

/ for the breaker being open was found. However, it is believed the breaker may

/

/1/2/

/ have been unintentionally disturbed by workers in the area.

The circuit breaker /

/1/3/

/ was closed and control power was verified.

/

/1/4/

/

/

FACILITY METHOD OF DISCOVERY DESCRIPTION (32)

STATUS

% POWER OTHER STATUS ( } DISCOVERY

/1/5/

/E/ (28)

/1/0/0/ (29)

/

NA

/

/A/ (31)

/ Operator Observation /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

/1/6/

/Z/ (33)

/Z/ (34)

/

NA

/

/

NA

/

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) /Z/ (38) /

NA

/

PERSONNEL INJURIES NUMBER DESCRIPTION (41)

/1/8/ /0/0/0/ (40) /

NA

/

LOSS OF OR DAMAGE TO FACILITY Ue3)

TYPE

DESCRIPTION

/1/9/

/Z/ (42)

/

NA

/

PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

/2/0/

/N/ (44)

/

NA

// ///////////

NAME OF PREPARER W. R. CARTWRIGHT PliONE (703) 894-5151 8211290274 821116 PDR ADOCK 05000339 S

PDR

)

o i

l Virginia Electric and Power Company North Anna Power Station,' Unit No. 2 Attachment: Page 1 of 1 Docket No. 50-339 Report No. LER 82-071/03L-0 I

Description of Event

on October 27, 1982, with Unit 2 at 100% power, the control power for the "B" Casing Cooling Pump was found de-energized.

The Casing Cooling System provides cold water to the suction of the outside Recirculation Spray Pumps.

This cold water assures that the required net positive suction head is available for the Recirculation Spray Pumps during all postulated accident conditions.

Probable Consequences of Occurrence 1

The Casing Cooling System was totally operable except for the motor control power. The control power was verified to be on 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> earlier by the operator log.

The Redundant Casing Cooling System was operable j

the entire time; therefore, the public health and safety were not affected.

Cause of Event

a The circuit breaker for the "B"

Casing Cooling Pump was found open.

It is believed the breaker may have been unintentionally disturbed by workers in the area.

Immediate Corrective Action

The breaker was closed and control power verified to the "B" Casing Cooling Pump motor.

In subsequent action Electrical Maintenance Personnel inspected the breaker for any malfunctions.

No malfunctions were found but the breaker was found to open with little effort.

l Scheduled Corrective Action No further action is required.

[

Actions Taken to Prevent Recurrence l

A guard was installed over the breaker to preclude any unintentional disturbing of the breaker by workers in the area.

l l

Generic Implications i

There are no generic implications associated with this event.

1 i