ML19209D193

LER 79-121/03L-0:on 790918,containment Sump Flow Integrator FTO-DA115 Stopped Totalizing Flow & Was Declared Inoperable. Caused by Piece of Rubber Glove in Internals,Preventing Rotor from Turning.Matl Removed & Totalizer Returned to Svc

ML19209D193
Person / Time
Site:	North Anna
Issue date:	10/18/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19209D187	List: ML19209D186 ML19209D190 ML19209D193
References
LER-79-121-03L, LER-79-121-3L, NUDOCS 7910190525
Download: ML19209D193 (2)

Text

NRC FORM.366 U. S. NUCLE AR REGULATORY COMMISSION (7J7)

LICENSEE EVENT REPORT CONTROL BLOCK:

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lh (PLEASE PAINT OR TYPE ALL REQUIRED INFoRMATION) l0 lil l V l A l N l A j S l1 lgl 0 l0 l- l 0 l0 l0 l0 l0 l- l0 l0 14 15 LICENSE NUMdER 23 lgl4 26 l1 l1 l1 l1 lgl57 CATbd UCENSE TYPE JO l jg 7 8 9 LICENSEE CODE CON'T 1 sl7lgl@

R O i ,g l t lg 0 l 5 l 0 l 0 l 0 l 3 l 3 l 8 l@l 0 l 9 l1 l8 l 7 l 974 l@i 1] nl 80 7 8 60 61 DOCK ET NUYBER 6d 63 EVENT DATE 75 REPORT DATE EVENT DESCPiPTION AND PROBABLE CONSEQUENCES h o 2 10n September 18, 1979, during Mode 1 operation, the containment sump flow integrator i g 3 FTO-DA115 stopped totalizing flow and was declared inoperable. Since the containmentj o ,  ; atmosphere particulate and gaseous radioactivity monitoring systems remained operable i IO lsi I to detect RCS leakage, the public health and safety were not jeopardized. Reportable l 0 g pursuant to T.S. 6.9.1.9.b. l O 7 l i o a i I 7 8 9 80 E CCE SUS E COYPONENT CODE SUSCODE S E 7

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33 Jb M 3/ 40 43 d? 43 44 47 CAUSE DESCRIP' lON AND CORRECTIVE ACTIONS h i O IFTO-DA-ll5 was removed and reolaced with the totalimr from Unit 2_ Tha defective l

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i i  ! totalizer was disassembled and a piece of rubber glove was found in the internals ii 7 1preventino the rotor from turning. After the material was removed, the totalizer I i a ifunctioned orocerly and was installed in Unit 2. I li141 7 G 9 80 STA S * .POV4 5 R OTHER STATUS Dis O RY DISCOVERY DESCRIPTION i 5 [.E_j@ l 01 514l@l NA l lAl@l** Operator Observation 7 8 EnviTY CO0 TENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE, i 6 NA l l NA l 7 8 9

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

Attachment:

Page 1 of 1 Docket No. 50-338 Repo-t No. LER 79-121/03L-0 Description of Event On September 18, 1979, during steady state operatio.n at 54% power, the containment sump flow integrator FTO-DAll5 ceased to function and was declared inoperable. This event is contrary to T.S. 3.4.6.1.c.

Probable Consequences of Occurrence The consequences of this event were minimal because the containment atmosphere particulate and gaseous radioactivity monitoring systems both remained operable to detect Reactor Coolant System leakage. As a result, the health and safety of the general public were not affected. There are no generic'imolications associated with this event, i

Cause of Occurrence FTO-DA115 stopped totalizing flow because a: piece of a rubber glove was caught in the internals preventing the rotor from turning. ,,

Immediate Corrective Action FTO-DA115 was replaced with Unit 2's totalizer. The defective totalizer was disassembled and the piece of rubber glove was found. After the piece of glove was removed, the totalizer functioned properly and was installed in Unit 2.

Scheduled Corrective Action No scheduled corrective action is required.

l .

Actions Taken to Prevent Recurrence ,

No further actions .tre required.

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