ML20028C154

LER 82-169/03L-0:on 821201,suppression Pool Narrow Range Sightglass Isolation Valves 1CM039-1CM045 Found Locked Open. Caused by Communication Breakdown Between Unit Nso & Equipment Attendant.Valves Realigned

ML20028C154
Person / Time
Site:	LaSalle
Issue date:	12/30/1982
From:	Pulak B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028C142	List: ML20028C141 ML20028C154
References
LER-82-169-03L, LER-82-169-3L, NUDOCS 8301070123
Download: ML20028C154 (2)

Text

._

CONTROL BLOCK: l l l l l  ! l (PLEASE PRINT CR TYFE ALL RECUIRED INFORMATIONI

. i $

J !1 1 LlLICENSEE l sig l ] l@l 0 IO l- I O I O l 0 l 010 l- l0 l 0 l@( 4 l 1 10 10 !0 !@l l lg 25 3 9 CCn 14 15 LICENSE N6 veer 26 LaCENSE TYPE Jo 67 CA T sa i:} ,,7,"] l L @l Ol Sl 0l 01 01 3I 7I3 68@ l1 "5

69 12 10 11 18 ! 742 @l112 75 l3 !0 l 8 (280\@

REPORT DATE 5 60 61 CoCKET NJe8 ER EVENT CATE EVENT DESCRIPTICN AND PROSABLE CONSEQUENCU h

,,;;j Supp pool narrow range sightglass n olation valves 1CM039 through 1CM045 were found y locked open when these valves are required to be locked closed per LAP 240-1. No significant airborne activity existed during the time that tlfesightglasseswere f-valveu in, and the sightglasses have demonstrated their ability to withstand contain-i5II .

I ment design pressure during ILRT, so no danger to public was present.

. i 71 I I I

anali _ 2 ccIE #((I c susCSE courcNENT CCDE S dg 53 g 191 S

l Zl Z lh dh l B l@ lZ lZ l Zl Zl Zl Z lh ]@ ]@

9 10 11 12 13 is ts 20 S E CU EP - ** '.L CCCuRRENCE ME*CMr REVISIOss EVENT YEAR REPORT No. COCE TYPE N O.

LER

@ ,asg/R0 l 8l 21

_ 21 22 l-l 23 111 619]

24 26 y

27 1013l 28 29 W

30 U31 O

32 N C C C P T MET NOURS 2 1 FC UR P Lt MA P "g'E l IXl@lGlg 34 l33 Z jg l34Z jg 3 l70 l0 l 0 'ltI 40 l S Sl Ylg]g 41 41 l Zlg 43 lZ l 9 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Tia; j Apparent corcmunication breakdown between unit NSO and equipment attendant prevented g

,,,g valves from being returned to the locked closed posftion. Valves were correctly g aligned upen discovery, operator ; raining is being performed and an operating y

, jg procedure to provfde for terap'orary valve changes is being draf ted. g I

I iai l

'sTSSY  % POWER ONER STATUS @ 015 C RY otSCOVERY OEscMrT10N h WALK DOWN l i 5 l l Blh l 0 l 0 l0 lgl NA l l A lgl l 4$7iviTY colTENT

=ELEASE FRELEASE LoCATtoM oF RELEASE @

b I6 l l Zl lZgl AMOUNT NA CF ACTIVITY 44 l

e

@NA l so l

! a 9 'O si PERSONNEL EXPCSURES I NuuSER TYPE C ESCRIPTICN l

" t 7 l l 01 0l 0lhWhl" Na l PesoNNEL iNau'dits l NwsER oEsCRirT'oNh NA l, H i 3 l l0 l 0 l 0lgl .

so s9 n 12 8301070123 821229 f 'r <*P E*'#"ets'CRPYo'N C87* @ PDR ADOCK 05000373 Na ,\

lt i 91 i e 9 IZ l@L10 go NRC USE ONLY ,

l issuEo '"'" o'ESCRiarios O 1 i e I LtLJ81 NA l lIII!II!!IIIl$

8 9 to 68 69 80.E

^

• PHCNE: 3 7 b7El # 00

'J AYE OF on[D AcEP

i

~ .

. I. LER NUMBER: 82-169/03L-0 II. L'.SALLE COUNTY STATION: Unit 1 III. DOCKET NUMBER: 050-373 IV. EVENT DESCRIPTION:

On 12/1/82 the suppression pool narrow range level'sightglass isolation valves 1CM039-45 were found in the locked open position by a shift engineer. These valves are required to be maintained in the locked closed position per LAP 240-1. The sightglasses had been valved in on 11/24/82 in order to check a questionable control room indication, and the equipment attendant performing the icvel reading left the valves in the locked open position according to his interpretation of instructions given by the unit NSO.

V. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

Since there was no significant amount of airborne activity in the primary containment during the time that the sightglasses were valved in and the unit was at power operation and since the sightglasses have demonstrated the ability to withstand the containment's peak accident pressure during the Unit 1 ILRT, the health and safety of the public was not affected as a result of this event.

VI. CAUSE:

The cause of this event is an apparent communication failure between the unit NSO and the equipment attendant performing the valving. The EA claims to have been instructed by the unit NSO to leave the sight-glass isolation valves open, while the NSO does not recall giving those instructions. There exists no documentation to verify either case.

VII. CORRECTIVE ACTION:

Valves 1CM039 through ICM045 were immediately returned to the locked closed position on 12/1/82. Results of a pro investigation conducted by station management is being reviewed by shift personnel in tailgate training sessions (AIR 1-82-592). In addition, an operating procedure is being drafted to provide a means of verification and documentation of final position of locked valves following temporary position changes (AIR 1-82-593).

Prepared by: B. Pulak