ML19254D850

LER 79-132/03L-0:on 790928,containment Isolation Valve, Charging Pump & Trip Valve Did Not Function as Expected During Safety Injection Functional Test.Cause Unknown. Equipment Will Be Repaired & Checked

ML19254D850
Person / Time
Site:	North Anna
Issue date:	10/25/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19254D843	List: ML19254D842 ML19254D846 ML19254D850
References
LER-79-132-03L, LER-79-132-3L, NUDOCS 7910300249
Download: ML19254D850 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7-77)

LICENSEE EVENT REPORT CON TROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 lo lil IV l^ lH l^ IS l1 l@[ o l o l - j o j o l o l o l e ! - l o l o25 l@l 26 9 LICENSE l i l i l TYPEi l iJul@l57 CAT l b8 Ig 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBEH CON'T o i "gn"c' Ll@l ol 5 jo lo lo l 3 l 3 l 8 l@l6')0l 9 l 2 l 817 l 9 74l@l751 ' oREPORT l 216 I7 980@

DATE 7 8 60 61 DOCKET NUMBER 68 EVENT D ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1012 ] [0n September 28, 1979, with the unit in Mode 5, containment isolation valve TV-CC10EL_j LO g charging pump 1-CH-P-1A and trip valve TV-MS111A did not function as expected durin- l

[iqT] lthe performance of the 18 month Safety injection Functional test. Since each compon3ntj l O 151i l s provided with redundancy, the health and safety of the general public were not ]

O o [affected. This event is reportable pursuant T.S. 6.9.1.9.b. I o 7 l l 0 8 l l

80 7 8 9 SYSTEM CAUSE CAUSE COVP. VALVE CODE CODE SU8 CODE COVPONENT CODE SU8 CODE SUBCODE o 9 lx l xl@ l x l@ l z l@ l xl xlx lx lx lx l@ g@ [zj @

9 12 13 18 19 20 7 8 to 11 SEQUENTI AL OCCURRENCE REPORT REVISION EVENT YE AR REPORT NO. CODE TYPE NO.

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33 34 3b 36 3/ 40 42 44 di CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 O IBecause of oresent olant conditions. the cause for thn malfuncrinns cannnt ns vnt hn l 1 i Ide t e rrii ned . Maintenance reoorts have been submitted tn ennir thn onninmont ne I

[i57; [soon as plant conditions permit, the equipment will be checked and repaired as necessar4.

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11 14 l I 7 8 9 80 ST S  % POWE R OTHER STATUS IS O RY DISCOVERY DESCRIPTION lilsl G l@ o l o l 0' l@]" NA l B l@l Surveillance Test A TlVITY CO3 TENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY @ LOC ATION OF RELEASE @

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7 8 9 10 11 44 PEHSONNE L EXPOSURES NUYBER TYPE DF SCRIPTION -

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7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION NA li l o 8l [z y 9 _J@l10 701A3nn 80 I

ISSUE 12 l 8n9 l [tL[@DESChiPTION l NA lllllIIllllll$

7 10 68 69 80. T, NAME OF PREPARER PHONE:

Virginia Electric and Power Company North Anna Power Station. Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-132/03L-0 Description of Event On September 28, 1979, during the performance of the 18 month Safety injection Functional test, containment isolation valve TV-CC1058 failed to close, charging pump 1-CH-P-I A did not stop when 1-CH-P-1B and IC started and auxiliary feedwater pump steam supply valve TV-MS111A failed to open when a safety injection signal was initiated.

Probable Consequences of Occurrence The consequences of this event were limited because each piece of equipment is

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provided with redundant backup. As a result, the health and safety of the general public were not affected. There are no generic implications associated with this occurrence at this time.

Cause The cause for the malfunctions have not yet been determined because present plant conditions will not permit determination.

immediate Corrective Action A maintenance report has been submitted to renair each piece of equipment.

Scheduled Corrective Action As soon as plant conditions permit, the equipment will be checked and repaired as necessary.

Actions Taken to Prevent Recurrence No further actions are required.

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