ML19256A704

LER 78-132/03L-0 on 781213:during Periodic Test for Post DBA Hydrogen Analyzer,It Was Found That the Analyzer Indicated 8.5% Less Hydrogen than the Sample Gas Indicated. Recombiner 2-HC-HC-1 Was Declared Inoperable & Analyzer Uncalibrated

ML19256A704
Person / Time
Site:	North Anna
Issue date:	01/03/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256A683	List: ML19256A682 ML19256A685 ML19256A692 ML19256A697 ML19256A701 ML19256A704
References
LER-78-132-03L, LER-78-132-3L, NUDOCS 7901090233
Download: ML19256A704 (2)

Text

a . . . . ~

(7 7/)

- LICENSEE EVENT REPORT l l l l l l (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

CON!Hol OL OCK- [

I b fo-IB

'l 8 'J VlAjNjA LICE N5LL (O!)L S

114l@l 010 l - l 0 l LILLNSL lb 0 0NUf.'GLH l o [0j - 1010_j@l4 11L ICt t.dl lyPE Ju 25 26 1IlIll@l $1 CAI M l@

CON'T l

O i B

$70 s ( I- j@l 0 l S l 0 l 0 l 0 e,o 01 3 3l8l@[1 2l1l31718l@lo DOCr t I NU'.'d E H t .8 03 EVLNT DATE 14 7S 1 l o 1317 l o l@

HlPOH1 D A1E FJ EVENT DESCRIPilON AND PROBABLE CONSEGUENCES o > L0n December 13, 1978, while the periodic test was beinq nerformed for the Post DBA I A

g l Hydrogen Analyzer (Hp -NC200), it was discovered that the analyzer indicated C.Sf' I g,y g lless hydrogen than the sample gas indicated. The recombiner (2-HC-HC-1) was declared _J o ., [ inoperable. Technical Specifications Statement 3.6.4.2 requires two containment I g [ hydrogen recombiners shall be operable. With 1-HC-HC-1 being operable,_no_degradat_ ion _j g lof the containment hydrogen removal systems occurred. Reportable as per i g lT.S. 6.9.1.9.b. I 80 S Y S 1 L '.i CAU$L CAUSE C O'.' P VALVE CODE col >L SUt: CODE COWONENT CODE SueCcor sutecooE o o g 9 I S l C l@ lE l@

10 11 12 X l @ lI .lN l5 lT lR [U l@ l E l@ W @

12 18 19

.u

/

OCCUHf;t i CE HU on1 H E V 8 3'ON SE QUEN TI AL

_(VE NT N E Af t HEPOHi NO. CODE TYPL N O.

@ ;t g,=4; f D HO 71 81 [ _._J 1 13 la l IM 10131 2S It 30 I l-l 31 32 01

_ 21 22 23 24 26 21 2.4 ON plt T 184 HOUHS SUB liitt F  !* t B. P LI it ',M Lr i t H E tt If A il J lI l(ii)lz l@ lJ3Z l@ lZ l@ lo 10 lo 0 I41 Yl@ (U l@ Al@ lB 44 IP IO I247l@

JJ ~ J4 36 31 40 42 43 CAUSE DESCT P flON AND CORRECTIVE ACTIONS i o lTho caus_e M _the event was due_t.n tbo andyw heing_out of calibraLion _ Fl mua c I g ; isolated from 2-HC-HC-1 with a maintenance report submitted to investiqate the ]

problem with the analyzer H 2A-HC200. A retest was performed and the recombiner l

,,,,,  ;(2-HC-HC-1) was returned to service. l l

li l41 I 80 7 8 9

% POWt it OTHE H ST AT US ISC f OISCOVf HY OF5CHiPTiOP' 51 Al JS i s [Ej@ l 0l 918l@l NA l Bl@l Periodic Test I A llVil Y CONTfNT AVOUNT Of ACTlVITY L OCATION OF HELE. ASE fitLtA5fD OF HE L i ASE lilol Iz l@ Lzj@l 1 8 9 to Ig NA 44 I I 45 NA 80 I

PL HSONNE L t xPO5Unt S NUP.'tif H TYPE DL bCHiP TION Ii Iil 10 I o Oj@lzl@l NA I PLH50NNF L INJU IES Nt it.*f1E H O[ SCHIP TION l

7 i a ti 9 0l0l0l@l 11 12 NA 80 t OSS OF Ott ()AV Abt 10 i ALILil V .

TYPI OL 5 CHIP ilON I Il bk 80 7 8 9 10 PUl!L IC11 Y r NRC USE ONt Y

• l'.St J E D

[ 2 l o l [tLj@(){SCHIPTION l NA l Ill IllIIIlIl7 10 60 te1 flu &

7 8 9 W.R.Gw M @t pgggg; M4WMM {

Naut Or enEeAnen

'l 9 01 o 90. y .

Virginia Electric and Power Company North Anna Power Station

Attachment:

Page 1 of 1 Docket Humber 50-338 Report Number 78-132/03L-0 D6scription of Event:

On December 13, 1978, while the periodic test for the Post DBA Hydrogen Analyzer (H2 -HC200) was being performed, it was discovered that the analyzer indicated 8.5% less hydrogen than the actual sample gas indicated. Due to the 8.5% difference between the analyzer and the sample, 2-HC-HC-1 was declared inoperable. Technical Specification Statement 3.6.4.2 requires that two separate containment hydrogen recombiners shall be operable.

Probable Consequences of Occurrence:

As a result of 1-HC-HC-1 being operable, no degradation of the containment hydrogen removal systems functions were expected. The public health and safety were not endangered by the inoperability of 2-HC-HC-1 since 2-HC-HC-1 was returned to service within 30 days.

Causes of Occurrence The cause of the occurrence was due to the analyzer H 2A-HC-200 being out of calibration.

Immediate Corrective Action:

To ensure that no flow entered the recombiner 2-HC-HC-1, the flow from the Unit 1 containment wa; isolated from 2-HC-HC-1. Once the flow had been isolated, a maintenance report was submitted to the instrument shop. The work performed under the maintenance report was to recalibrate and retest the analyzer. During the retest, the analyzer and the sample gas indicated the same percentage, recombiner ?-HC-HC-1 was placed back into operable status.

Scheduled Corrective Action:

No further action required.

Actions Taken to Prevent Recurrence:

No further action required.