ML20084Q002

LER 017/03L-0:on 761203,Grinnell Corp Snubber 4755 on RCIC Steam Supply Piping Found to Have Empty Oil Reservoir. Caused by Leakage Through Reservoir End Gap Gaskets.Snubber Repaired & Reservoir Refilled w/oil.W/761230 Forwarding Ltr

ML20084Q002
Person / Time
Site:	Quad Cities
Issue date:	12/30/1976
From:	Kalivianakis N, Pearson J COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-76-017-03L, LER-76-17-3L, NJK-76-487, NUDOCS 8306130093
Download: ML20084Q002 (3)

Text

• t ua Nucc P wer t tion ggZg U

"'7 22710 206 Avenue North

• > Cordova, Illinois 61242 Telephone 309/654-2241 f

.. 'r

, I N' '

NJK-76-487  %

'T1 ' /

' ~

P(Lg\ '%

d , , .

December 30, 1976 JAN191977 > &

_M; %FETCLN @ ~4'

e. . c m ,.

VMYB23 sy.

J. Keppler, Regional Director f' .

Office of inspection and Enforcement -

Region til U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Reference:

Quad-Cities Nuclear Power Station Docket No. 50-265, DPR-30, Unit 2

,' Appendix A, Sections 3.6.1 and 6.6.B.2.b Enclosed please find' Reportable Occurrence Report No.

~

R'. 50-265/76-17 for quad-Cities Nuclear Power Station.

This report'is submitted to you in accordance with the requiremsnts of Technical Specification 6.6.B.2. .

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION s

.7 ]

// /G!$f6Y N. J. Kalivianakis (

Station Superintendent NJK/FJG/lk a, cc: G. A. Abrell s

585 1 JMig . ,. .

8306130093 761230 5' OM '

PDR ADOCK 05000265 .

6 PDR

UCENSEE EVENT R T CONTROL BL l l l l l l [PLEASE PRINT ALL REQUIREJ INFOZMATION)

, 1 6 NAME UCENSE NUMBEA E TYPE

~ O1 l llL lQ l Al Dl 2l 7 89 14 l0 l0 l-l 0 l 0 l 0l 0l 0l-l0 l0 l 15 25 l4l1l1l1l1l 26 30 l0l3l 31 32 CATEGORY P a E DOCKET NUMBER EVENT OATE AEPORT OATE O 1 CONT l l l .I l Ll l0 l5 l0 l-10 l 2 l 6l 5l l1 l2 l0 l 3 l 7 l 6l l1 l2 l3 l0 l7 l 6 l

,7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION gg l While performing routine Hydraulic Snubber surveillance on Unit Two in accordance l 7 89 60 gg l with Technical Specification 4.6. l.1, Grinnell Corp. snubber #4755 on the Reactor l 7 89 80 55 l Core isolation Cooling System (RCIC) steam supply piping was found to have an empty l 7 89 80 SE l oil reservoir. All other hydraulic snubbers which were inspected were found to be l 7 89 60

@l in satisfactory condition. Work Request 4759-76 was immediately issued to repair [

7 89 pnus 80 DE CODE COMPONENT CODE ER MANUFAC R VOLATON M l d El d 7 89 10 11 lH l A lN l Gl El Rl 12 17 lL l 43 44 lG l2 l5 l5l 47 lN l 48 CAUSE DESCRlPTION O l (Proximate Cause-Equipment Failure) The empty snubber oil reservoir was caused by l 7 89 80 ll l leakage through the reservoir end cap gaskets, thereby allowing the reservoir to drairj.

7 89 80 1 l No fittings or tubino were found to be defective, and the snubber appeared to be l 7 89 [gyintact. METHOO OF STATUS  % POWER OTHER STATUS Or.iCOVERY OISCOVERY DESCRIPTION 7 8 9 W l0l0l0l l 10 12 13 NA l 44 W 45 l Routine snubber surveillance 46 80 l

ACTNITY CONTENT DEL E ASEO OF RELEASE AMOUNT OF ACTNITY LOCATON OF AELEASE H Iz I LzJ l "A I I NA l

7 8 9 10 11 44 45 80 PERSCNNEL EXPOSURES NUMOLA TYPE DESCAIPTION D[ l q 0l 0l 7 89 11 Wl 12 13 NA 80 l

PERSONNEL INJUR!ES NUMBER DESCnlPTION ll l () 0l 0l l NA 'A l

7 89 11 12 80 OFFSITE CONSEQUENCES NA DE I l 7 89 80 LOSS OR DAMAGE TO FACILITY TYPE DESCALPTON DE U 7 89 l

10 NA 80 l

PUBLICITY ,,' ,

M l NA l 7 89 80 AOOITIONAL FACTORS ll l (Event Description-contd) the snubber and refill the reservoir with oil.

• l 7 89 . 00 gg l Failure of this snubber did not in any way render.the RCIC System incapable of l 7 89 UO J. Pearson 309-654-2241 ext. 252 NAME: PHONE:

cro est. ss?

~

. I .

w . ,a -

e PAGE 2 1

(EVEliT DESCRIP'i10N CONTINUED)

/ .s performing its intended function in the required manner. Snubber No. 4754, '

which is located on the same steam line as No. 4755, was fully operable and would have minimized the safety implications had a seismic event taken place.

(R0 50-265/76-17)

Corrective Action to Prevent Recurrence Snubber No. 4755 was rebuiit and a new reservoir was installed. It was then refilled with the prescribed amount of oil. The new reservoir is of an improved design with a more effective seal system. This corrective action has been deemed adequate to resolve this occurrence. All repairs and reinstallation were completed on December 5, 1976.

Failure Data This particular hydraulic snubber experienced a low oil level condition in the reservoir on one prior occasion on October 6, 1976. However, the snubber was fully operable at that time and had sufficient oil in its reservoir to perform its intended function.

w e

e h

• k s

e e

4 h

6

-