ML17252B507

LER 77-044/03L-0 for Dresden, Unit 2 Re Conditions Leading to Operations in a Degraded Mode Permitted by a Limiting Condition for Operation

ML17252B507
Person / Time
Site:	Dresden
Issue date:	10/28/1977
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR 1010-77 LER 77-044/03L-0
Download: ML17252B507 (4)

Text

e Commonwea9Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 REGULAro.~v DGCl{IT FILE COPY

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October 28, 1977 BBS LTR 111010-77 James G. Keppler, Regional* Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

• .Reportable Occurrence Report No. 77-044/031-0, Docket No. 050-0237, is hereby 'submitted to your office in accordance with Dresden Technical Specification 6.6.B.2.(b), conditions leading to operation in a degraded mode p~rmitted by a limiting condition for operation.

phe son Station Superintendent Dr-esden Nuclear Power Station BBS:dlz Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC OCT 311977

'N1ft! mm '!nm' (7-77) e LICENSEE EVENT REPORT e

• ,CON!R<?L BLOCK: .____._l_...._____.l..___.l..___.j 8 *- (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

~I II LI DI RI s1 21@1 01ol-10101010101-.lo lo 1014 I 1l 1l 1l 1101 I 10 7 8 9 LICENSEE CODE*. 14 . 15 . LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T - *

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1 *. 8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT D~SCRIPTION ~ND PROBABLE CONSEQUENCES@

I o-l 2l-f-Wft:He--perfOrming routine surveillance DIS 1500-9 DPIS 261-35B was found tripped and *I

~I indicating 1.8 PSID. Switch valved out and equalized with no change in indication:v I.

[QJI] 1.~afety implications -~inimal *because three redundant switches were available. This is

((!)) 1not a repetitive occurrence.

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7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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20 SEQUENTIAL OCCURRENCE REPORT REVISION r.:;-. LE R/RO LVENT YEAR REPORT NO. CODE; TYPE NO.

~ REPORT .

NUMBER I 7 I 7 I .. Io 14 J4 I I /I I oI 3 I LU L£J 21 22 2J 24 26 27 28 29 JO J1 J2 ACTION FUTURE EFFECT SHUTDOWN r:;::;... ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS ~ SUBMITTED FORM $UB. SUPPLIER MANUFACTURER

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JJ J4 JS J6 J7 40 41 42 4J 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @.

[i))J I Cause was damaged "bellowst':,_$:Witch returned to vendor for repair, will be installed

[I]JJ upon return. Switches will continue to be tested under DIS 1500-9 as a prereg. for ITIIJ LPCI logic surveillance DIS 1500-5 prior to start-up during each refuel outage. Swit-e* .I-

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ITIIJ I ches will be placed on master surveillance schedule to be calibrated semi.-annuaJ:tY>

[InJ I Switch is Barton MO. 288.

7 - 8 9 BO FACILITY STATUS  % POWER OTHER STATUS METHOD OF DISCOVERY DISCOVERY DESCRl;TION

~~ I 0 I 0 I 0 l@L-1__. ; .;.N; .; _A_ ___, l.U@I Performing Surveillance 7 8 9 10 12 11 44 45 46 80

.ACTIVITY CONTENT , Q\

RELEASED OF RELEASE AMOUNT OF ACTIVITY ~ LOCATION OF RELEASE @

IT:fil LU @) W@l 7 8 9 10 11 NA 44 I 45 NA 80 PERSONNEL E~POSURES

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NUMBER ~TYPE DESCRIPTION

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7 8 9 11 12 1J 80 PERSONNEL INJURIES Q NUMBER DESCRIPTION~

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7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY f,i3' TYPE DESCRIPTION .i,::;:J EITI ~@)'--"'---_;_-----------------,---------

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7 8 9 10 68 69 80 ;;;

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-ATTACHMENT TO LICENSEE EVENT REPORT 77-044/03L:....O COMMONWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT 2 (ILDRS2)

DOCKET fl 050-0237 While performing DIS 1500~9, Differential Pressure Switch 261-35B was -

found tripped and indicating ;L.a PSID. The switch senses the differ-enti_al pressure across the B" recirc. pump iri System I of the LPCI injection logic system and, iri conjunction with 261-35A, C and. D, de-tects wh~ther one or no recirc. pumps are running to.determine th~

logic *sequence for possible LP.CI Injection ~alve Opening. -. This is not within Dresden's setpoint tolerance of 55+/-5" .H20 pressure.diff-*

erence. There is no Tech Spec requirement. The switch was* valved out and equalized and the indication did not cliange. The.safety implications

• of this event are minimal because there are three redundant switches

• a~ailable forQ23-"r~uii~'f~n _E..uri!~The - sW.~~~fs -are~:n.ormally.

closed upori R~circ Pump Operation and> 55 +/:-5" H20. This is not a repetitiv:e occurrence.*_ The initial ohservation revea1ed the bellows to appear sluggish~ WR 1/8642 was written to *inspect and repair as nec-essary:. Upon dismantling the switch the bellows was fotind to .be damaged.

The switch *will be returned to the vendor for repair .and will be installed upon return.

These switches will continue to be tested via DIS 1500.,-9 as a prerequisite.

• for.the LPCI Containment Cooling System Logic System Surveillance DIS l50Q.,..

5_ required before start:....up after each refueling .outage.

In addition,. to further assure. system reliability these switches will be*

placed onthe master surveillance scheduleto be-calibrated.semi-annually.

No further action is deemed necessary.at this .time.

RECEIVED DOCUMENT PROCCSS!r!G UNIT 1977 NOV I I PM t 57 i* .. '

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