ML19351E899

LER 80-089/03L-0:on 801024,pressurized Level Transmitter LT-RC-459 & Spare Failed.Cause Unknown.Original Plant Equipment Reinstalled.Addl Review Resulted in Westinghouse Submittal Re IE Bulletin 79-01B

ML19351E899
Person / Time
Site:	Beaver Valley
Issue date:	12/12/1980
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19351E891	List: ML19351E890 ML19351E899
References
IEB-79-01B, IEB-79-1B, LER-80-089-03L, LER-80-89-3L, NUDOCS 8012190509
Download: ML19351E899 (2)

Text

-. --_

U. S. NUCLEAR REGULArGr.Y COMMISS4ON aC 7 ORM 3se a.m LICENSEE EVENT REPORT i iPLEasa paint On tvPs 4L6 REauinEO NPonMarioNi CoNrnot.8tOCm I i

I I i I l@

l l ITIIl I P i Auce=l 5seal coat se V [ Ssel 1 l@l 0 l 0 l-ucame ts l 0 l0 =uuna l 0 l 0 l 0 l-al0 ( 0 l@l4 .4 uctusa l1 Tvre(1a l1 sicarw@

l1 l@l

",ic l L @l 0 l 5 l 0 l 0 l 0 l 313 l 4es @lse 11012 ] 4 l 8 l 0 @l4 Il 21 tv ta.r oara i.

1l 21 atroaT oara 81 Ol@ so s ao si oocmar=uweam EVENT DESCRIPTION AND P9CS A8LE CONSEQUENCES h

. ITTTI I On 10/24/80 Pressurizer Level Transmitter [LT-RC-459] and its spare failed. These [

The l g l were Barton Lot II qualified transmitters installed during the 1980 outage.

There is minimal safety l

("5"T71 I original plant equipment transmitter was reinstalled.

l l .

g i significance since the transmitter does not see a harsh environment during its only l

@ l trip function. Two qualified transmitters remain for post accident monitoring use. l l

IITYl l Refer to C. N. Diinn letter to B. H. Grier dated November 7. 1980.

. I lo tal I eo Yo's" TooY su$ cst councNewT ecos susYos su"NEos f

l'oT91 7 8 lI l A l@ lB l@ l.2A l@ lI lN lS lT lR lU l@ lT [@ (Z l@

9 to ii 2 18 19 20 AEVislON stoutNTiAL octuRRENCE MPoRT RtPoRT NO. cooE TYPE No.

O17 Lgg/mo mE EVENT YEAR l 810l 10 l8 l 9 l 24 26

,l /l 27 l013 l 28 29 lL l 30

(--.j 3i W

22

2. 22 23

" *'u",'etis7

'po*E"$0s. u Tu"Ifc'En'en YEIN IcEEd oElt'Er '"wE?.Eo* wouns @ #'u'e'di s S o* s gl24Cl@ lssZ l@ lZ l@ l0l0l0l0l l4 Y [@ lNl@ l42Al@ lB

=

l0 l8 l047l@

se si 4a 42 sa cAusE DESCRIPTION AND CORRECTIVE ACTIONS @ The ;

g l The cause of the transmitter failure is not known and is still being analyzed.

g ; use of the original transmitter is temporary until a replacement can be obtained and installed. An additional review of this matter with Westinghouse has led to an ,

g

, ,  ; Incerim Submittal.for IE Eulletin 79-OlB (see attached).

i

. . en i . ,

oisco Y oiscovtRY oEsCMi, Tion 32 STATu isPowtR QTHER status N/A l B l@l Performing channel check tesY l i 5 (,,,gj@ l0 l 0 l 0 l@[ -

l 4 .

> . g,,,,,, ,gg,,, >2 n touTioNo,atais.@

= te s.o e, n tris.

ov=To,.cTiviTv N/A

@I I N/A I 8 Lz_J @ LzJ@l " * "

' n so '.*t o ,osd!.es

~uon. Tv,. o scainioN@ I i i 101010 l@l.zj@l N/A n, iso .'c'. uu'4 s muueen otscniano=h l t A l0l0l0l@l i, i N/A oEsCn PT e4 l

'

• lzj@l N/A

> . . i.

PuttiCity NRC USE ONLY ,

45 2 o issuti@OtsCM'*

Ll l Tion N/A B612.1%5df .

i i i i i iiiiiiiii;;- ..

> . . i.

w* S* b'C*I 412-643-8525 g NAME OP PREPARER PHONE:

Attachment To LER 80-89/03L Beaver Valley Power Station Duquesne Light Company Docket No. 50-334

\ Interim Submittal For IE Bulletin 79-OlB Pressurizer Level Transmitter {LT-RC-459]

Location And Safety Function Since pressurizer level coincident with pressurizer pressure has been removed as a safety injection initiation requirement following TMI, the pressurizer level function no longer performs a protective trip function for any event causing an adverse environment inside containment. Thus the transmitters are only used for post-accident monitoring purposes with respect to these accidents.

Qualification Deficiency At present, there are two new Barton Lot 2 transmitters and one original transmitter (Barton qualified in WCAP-7410L) that provides this function.

The original transmitter is not qualified for post-accident monitoring. It was re-installed as a temporary replacement for a new transmitter that developed a calibration problem.

Failure Mode Analysis No deleterious control action will result should the original transmitter fail when the pressurizer level control is in AUTO, because during SI, CIA or CIB the pressurizer level control system is defeated by closure of the charging system flow control valve which isolates the normal charging header from the reactor coolant system. Furthermore, to minimize any control system interaction by pressurizer level channel, (LC-RC-459], prior to SI, its pressurizer level, control input will be administrative 1y limited to the minimum time periods required for maintenance and surveillance testing.

Justification For Interim Operation

~

Justification for interim operation with one original transmitter and two new (Barton Lot 2) transmitters performing the pressurizer level function is as follows. First, the two qualified transmitters (LT-RC-460 and 461] provide the identical functiIons of the original transmitter and are powered from different power supply trains. Second, should the original transmitter fail, the operator is instructed to refer to redundant instrumentation by the following note in Section 2, " Precautions And Limitations" of Operating Manual Chapter 53,

" Emergency Operations".

The process variables referred to in these instructions are typically monitored by more than one instrumentation channel. The redundant or related channels should be checked for consistency while performing the steps of these instructions. Consideration must be given to the possibility of instrument errors caused.by the transmitters being located in a hostile atmosphere created by the accident.

Resolution Of Qualification Concern The new qualified Barton Lot 2 transmitter which developed a calibration problem is being sent to the vendor for repair. The repair process is being expedited.

Installation will be made at the first outage following delivery in which plant conditions permit replacement, no later than June 30, 1982.

- - , - - . - - , . , , . . . , - .-e - - , , - - - - - - - ~ , , , - . , - - - ,