ML19347E299

LER 81-014/03L-0:on 810325,closure Weight on Check Valve 1-RS-18 Found Missing.Cause Unknown.New Weight Mfg & Installed.Valve Type C Tested

ML19347E299
Person / Time
Site:	North Anna
Issue date:	04/20/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347E296	List: ML19347E295 ML19347E299
References
LER-81-014-03L-01, LER-81-14-3L-1, NUDOCS 8104240544
Download: ML19347E299 (2)

Text

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r' s U.S. NUCLEAR REGULATORY COMMISSION O LICENSEE EVENT REPORT r CONTROL BLOCK / / / / / / / (1) (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

(J /V/A/N/A/S/1/ (2)

LICENSEE CODE

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

LICENSE NUMBER

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

LICENSE TYPE

/ /

CAT

/ (5)

S E LL/ (6) /0/5/0/0/0/3/3/8/ (7) /0/3/2/5/8/1/ (8) /o /4 /2 /0 /8 /1/ (9)

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

/0/2/ / On March 25, 1981, while in Mode 5, a closure weight on check valve 1-RS-18 /

/0/1/ / was found to be missing. This would prevent positive closure of the valve /

/0/4/ / thereby rendering the valve inopecable as per T.S. 3.6.3.1. However, since /

/0/5/ / the outside recirculating spray system is a closed system, the health and /

/0/6/ / safety of the public were not affected. This item is reportable pursuant to /

/0/7/ / T.S. 6.9.1.9.b. /

/0/8/ / /

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/ /S/B/ (11) LX/ (12) LX/ (13) /V/A/L/V/E/X/ (14) [C/ (15) LA/ (16)

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

(17) REPORT NUMBER /8/1/ /-/ /0/1/4/ O/ /0/3/ g/ /-/ LO/

ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT ?"?RD-4 PRIME COMP. COMPONENT (D TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER t ,'

LA/ (18) LZ/ (19) g/ (20) LZ/ (21) /0/0/0/0/ (22) LY/ (23) LN/ (24) M/ (25) /S/0/7/5/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The cause of the weight removal is unknown. A new weight was manufactured /

/1/1/ / and installed and the valve Type C tested with satisfactory results. /

/1/2/ / /

/1/3/ / /

/1/4/ / /

FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

/1/5/ [G/ (28) /0/0/0/ (29) / NA /( M/ (31) / OBSERVATION /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35) LOCATION OF RELEASE (36)

/1/6/ /Z/ (33) LZ/ (34) / NA / / NA /

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39) l /1/7/ /0/0/0/ (37) /ZL (38) / NA /

PERSONNEL INJURIES NUMBER DESCRIPTION (41)

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

LOSS OF OR DAMAGE TO FACILITY

()

/2/9/

TYPE LZf (42) /

DESCRIPTION NA

)

/

PUBLICITY ISSUED DESCRIPTION (45) NRC USE ONLY

/2/0/ d[ (44) / NA /////////////

NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151

[O10424QTgr

.w- *

() Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of I Docket No. 50-338 Report No. LER 81-014/03L-0 Description of Event On March 25, 1981, during Type "C" testing, it was noticed that the closure weight on check valve 1-RS-18 was net installed. This would prevent positive seating of the check valve when differential pressure in the direction of flow is < 1.2 psid.

Probable Consequences of Occurrence Failure of the check valve to fully seat during normal operation conditions would provide a potential leakage path from the containment.

However, the outside recirculating spray subsystem is a closed system since the suction and discharge piping terminate inside of the containment. Therefore, the health and safety of the public were not affected.

Cause of Event The cause of this event is unknown. The time of removal of the weight could not be determined. During the refueling outage there was maintenance conducted in the area and, possibly, the weight was removed to clear an

(]) obstruction. However, this could not be verified by documentation nor by interviews with maintenance personnel.

Immediate Corrective Action A valve weight was manufactured and installed. The valve was sub-sequently tested as per the Type "C" testing program with satisfactory results.

I Scheduled Corrective Action l

No further action required.

Actions Taken to Prevent Recurrence The need for formally documenting the removal of obstructions by initiating a work request will be re-emphasized to each maintenance department.

Generic Implications There are no generic implications associated with this event.

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