05000324/LER-1981-071-03, /03L-0:on 810729,primary Containment Atmospheric Control Suppression Chamber Water Level Wide Range Recorder, 2-CAC-LR-2602,indicated Erroneous Level.Caused by Loss of Trickle Flow to Transmitter Ref Leg Due to Blockage

/03L-0:on 810729,primary Containment Atmospheric Control Suppression Chamber Water Level Wide Range Recorder, 2-CAC-LR-2602,indicated Erroneous Level.Caused by Loss of Trickle Flow to Transmitter Ref Leg Due to Blockage

ML20010D231
Person / Time
Site:	Brunswick
Issue date:	08/17/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010D228	List:
References
LER-81-071-03L, LER-81-71-3L, NUDOCS 8108240115
Download: ML20010D231 (2)

LER-1981-071, /03L-0:on 810729,primary Containment Atmospheric Control Suppression Chamber Water Level Wide Range Recorder, 2-CAC-LR-2602,indicated Erroneous Level.Caused by Loss of Trickle Flow to Transmitter Ref Leg Due to Blockage

Event date:
Report date:
3241981071R03 - NRC Website

text

NRGF ORM 'j66 U. S. NUCLEAR REGULATORY COMMISSION (777L LICENSEE EVENT REPORT I

CONTROL BLOCK: l l

l l

l l lh (PLEASE PRINT OA TYPE ALL REQUIRED INFORMATION) 1 6

F i l LN I c I a l e l e I d@l 0101 l 0101010101 l 01 Ol@l 4 l 1 l 1 l1 ] 1 l@l l

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8 9 LICENSEE COr E 14 15 tl CENSE NUMBkH 25 26 LICENSE TYPE Ju 57 L A T $8 CON'T lolil S$I((E I Llgl 0l S j 0l -l 0 [ 3 l 2 l 4 Ql 0 l 7 l 2 l 9 l 8 l 1 @l 0 l 8 l 1 l 7 l 8 l 1 l@

7 8

60 61 DOCK ET NUMBER 68 09 EVENT DATE 14 75 REPORT DATE 80 EVENT DFSCRIPTION AND PROB ABLE CONSEQUENCES h o 2 l During plant operation, it was discovered that primary containment atmospheric contro1l [5 JT] l suppression chamber water level wide range recorder, 2-CAC-LR-2602, showed a level of l

[ o l 4 l l 30 inches, while the other RTGB suppression chamber water level indicators showed the l lo isI l 1evel was at 29 inches. This event did not affect the health and safety of the l

l o ls l l public.

A similar event involving the suppression chamber water level indicators, l

lo l 7 l l 2-CAC-LI-2601-3 was reported in LER 2-81-22.

l loisl l Technical Specifications 3.3.5.3, 6.9.1.9b l

80

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8 9 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SU8 CODE COMPONENT CODE SUBCODE SUBCODE lol91 l1 lE l@ J@ W@ lV l AlL lV lE lX l@ lG l@ ]@

7 8

9 10 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISION

_ EVENT YE AR REPORT NO.

CODE TYPE NO.

LER RO h, RE{, R l8l1l l-l l 0 l 7l 1[

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_,, 21 22 23 24 26 21 28 29 30 31 32 SEBNIT TAKEN ACT ON ON PLANT T

HOURS 22 FOR S B.

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33 J4 d5 36 31 40 41 42,_

43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o l l A blockage in the instrument transmitter, 2-CAC-LT-2602, water supply throttle valve ;

Ii11'l ! caused a loss of trickle flow to the transmitter reference leg which resulted in the l

l1 l2l l erroneous level indication. The valve was cycled to remsve the blockage and trickle ;

l 1131 l flow was reestablished to the transmitter. The transmitter was then recalibrated l

ggl and the recorder was returned to service.

l 80 8 9 STA S

% POWER oTHER STATUS ISCO RY DISCOVERY DESCRIPTION NA l

l A l@l Operator Surveillance l

l t l 5 l [Fj@ l0 l 5 l0 l@l

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'S A!Tivirv cob 1 RELE ASID OF RE LE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE NA l

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8 9 10 11 44 45 80 PEHSONNEL E XPOsLHES NUYBER TYPE DESCHIPTION l i l i l i 01 01 0_l@LZ_]@l NA l

8 PEnsONNd'muLS NUV9EH DE SCId P TION li la l I 0101 Ol@l NA l

80 7

8 9 11 12 L Oss OF OO DAMAGE TO F ACillTV TYPE DESLHIPTION li l o l I zi@l NA l

80 7

8 9 10 NRc use ONov

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84 8108240115 P10817 M. J. Pastva, Jr.

(919) 457-9521 2

PDR ADOCK 03000}24 PHONE:

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LER ATTACH!iENT - RO #2-81-71 Facility: BSEP Unit No. 2 Event Date: 7/29/81 As a result of an event inv,alving this instrument on Unit No. 1, reported in LER 1-81-07 and a post-TMI requirement, a plant modification package (1-80-78 for Unit No. 1 and 2-80-99 for Unit No. 2) has been developed. This modification will install a condensing pot in the reference leg in order to increase the accuracy and reliability of this instrument, and remove the requirement to have flow in the reference leg to ensure that it is full.

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