05000325/LER-1982-145-03, /03L-0:on 821129,main Steam Safety Relief Valve (SRV) Position Indication Instrument 1-B21-TR-R614,points 2 & 4 Printed Intermittently on Chart Paper.Srv Sonic Detector Lights Inoperable.Caused by Timing Motor Gear Teeth Wea

/03L-0:on 821129,main Steam Safety Relief Valve (SRV) Position Indication Instrument 1-B21-TR-R614,points 2 & 4 Printed Intermittently on Chart Paper.Srv Sonic Detector Lights Inoperable.Caused by Timing Motor Gear Teeth Wear

ML20028C213
Person / Time
Site:	Brunswick
Issue date:	12/28/1982
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028C210	List: 05000325/LER-1982-145, Forwards LER 82-145/03L-0 05000325/LER-1982-145-03, /03L-0:on 821129,main Steam Safety Relief Valve (SRV) Position Indication Instrument 1-B21-TR-R614,points 2 & 4 Printed Intermittently on Chart Paper.Srv Sonic Detector Lights Inoperable.Caused by Timing Motor Gear Teeth Wea
References
LER-82-145-03L, LER-82-145-3L, NUDOCS 8301070208
Download: ML20028C213 (2)

LER-1982-145, /03L-0:on 821129,main Steam Safety Relief Valve (SRV) Position Indication Instrument 1-B21-TR-R614,points 2 & 4 Printed Intermittently on Chart Paper.Srv Sonic Detector Lights Inoperable.Caused by Timing Motor Gear Teeth Wear

Event date:
Report date:
3251982145R03 - NRC Website

text

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION 0 7H LICENSEE EVENT REPORT a

CON TROL BLOCK: l l

l l

l l

lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

lN lC lB lE lP l 1l@l0 l0 l -l 0 l 0 l 0 l 0 l 0 l - l 0 l 0 l@l 4 l 1 l 1 l 1 l 1lh!

l l@

o i 7

8 9 LICENSEE CODE 14 15 LICENSE NUMBER 26 26 LICENSE TYPE Ju 57 CAT 68 CON'T l0l1l N M l Ol 5l 0l -l 0l 3l 2l 5 O l 111 l2l9l8l2 hl 1l2l2l8l8l2l@

7 8

60 61 DOCKET NUMBER 68 69 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l Routine surveillance during plant operation revealed that points 2 and 4 of main steam I O 2 ygy3; lSRV position indication instrument, 1-B21-TR-R614, were intermittently printing on the l lgl4gl instrument chart paper. At the time, the indication lights of the respective redundantl y o ;,, ; gSRV position indication sonic detectors, 1-B21-FY-4158 and 4160 were not operable.

I p g lThis event did not affect the health and safety of the public.

l [gl7j l Technical Specifications 3.3.5.3, 6.9.1.9b l

10181!

l 80 7

8 9 DE CODE S BC E COMPONENT CODE SUFC DE SU E

l Il Dlh Wh l E l@ lI lN lS lT lR lU lh yh l_Zj h O 9 7

8 9

10 11 12 13 18 19 20 SEQUE NTI AL OCCURRENCE REPORT REVISION

_ EVENT YE AR REPOHT NO.

CODE TYPE NO.

L f H HO

@,Le,rg l1 81 21 L- _]

11 14 15 I Ig_]

I 01,1 LLJ I-I LO_J

_2 22 23 24 26 27 28 29 30 31 32 AK P TO ON PL A T T4 HOURS S B IT FOR B.

SUPPLIER MAP F CTURER l^l@ W @

[Zj@

W@

l 0l 0l 0l 0l WQ l Yl@

l Nl@

lLlIl3lCl@

.13 J4 35 J6 3#

40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l 0 l l Wear of the timing motor gear teeth in the R614 caused the intermittinn printinn of I

goints 2 and 4.

The failure of the 4158 and 4160 indication lichts is attributed tn I

i i

,, y.,y l defective sonic detectors. The timing motor gear in the R614, Model No. P15FAA62, wasl

, ; 3 g l replaced and the instrument was returned to service. During the current refueling l

l outage, the 4158/4160 sonic detectors will be repaired as required.

I

, 4 80 7

8 9 SA S

% POWE R 01HER STATUS is OV RY DISCOVERY DESCRIPTION I1 l5l [ EJg l0 l6 l8 l@l NA l

lA[gl Operator Surveillance l

ACTIVITY CONTENT RE LE ASE D OF RE LE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE NA l

l NA l

l1 l6 l W @ l Zl@l 7

H 9 10 11 44 45 80 PL H5ONNE L E X"OSURES NUMBE H TYPE

DESCRIPTION

l l0l0l0l@ W @l NA i 7 8301070208 821228 80 7

8 9 11 12 13 etRsONNE t iN;UniES PDR ADOCK 05000325 NUVHER DESCRtPTION,,

PDR l0l0l0l@l l

1 a 7

ft 9 11 12 80 L OSS Of OH DAMAGE TO F ACILITY TYPE DE SC RIPTION NA l

Ii I 9I Lz l@l 7

H 9 10 80 8

@l ESCHiPTION issy NA l

l l l l l l l l l l l l l,;

2 0 68 69 80 5 7

8 9 10 M. J. Pastva 919-457-9521 N AMt! OF PREPARER PHONE:

LER ATTACllMENT - RO #1-82-145 Facility:

BSEP Unit No. 1 Event Date-November 29, 1982 This event occurred when both the sonic and temperature indications of valve position for SRV-1-B21-F013B and D were inoperable at the same time.

Prior to this event the primary position indication system indicators for these valves, sonic detectors 1-B21-FY-4158 and 4160 were each inoperable, as the indicators' RTGB lights were not functioning.

Routine surveillance during plant operation on November 29, 1982, revealed that the secondary position indication system for these valves tail pipe temperatures indicated by points 2 and 4 on 1-B21-TR-R614 were showing expected indications, but were intermittently printed on the instrument chart paper.

An investigation of the TR-R614 printing problem revealed that wear of the instrument timing motor gear teeth had resulted in sufficient gear to gear mating slippage to prevent consistent printing.

A preliminary investigation of the problems affecting 4158 and 4160 determined the most probable source of the failure 13 with the respective detector to the 4158 and 4160 instruments. As these detectors are located within the drywell, further investigation and a resolution of this problem will be accomplished during the current 1982 Unit No. 1 refueling outage.

The failed timing motor gear in B21-TR-R614 was replaced and the instrument, L&N Speedomax, Model No. P15FAA62, was returned to service.

Present periodic maintenance of this type instrument in this particular application is felt to be adequate in the prevention of future similar events.

l