ML19095A620

Submit Reportable Occurrence No. USRE-S1-76-06 Re Water Dripping Out of Air Box Drain

ML19095A620
Person / Time
Site:	Surry
Issue date:	05/27/1976
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/RGN-II
References
Serial No. 051 LER 1976-006-00
Download: ML19095A620 (3)

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VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA. 23261 May 27, 1976-Mr. Norman c. Moseley, Director Serial No. 051 Office of Inspection and Enforcement PO&M/ ALH: j lf

u. s. Nuclear Regulatory Commission Region II - Suite 818 Docket No. 50-280 230 Peachtree Street, Northwest License No. DPR-32 Atlanta, Georgia 30303

Dear Mr. Moseley:

Pursuant to Surry Power Station Technical Specification 6.6.2, the Virginia Electric and Power Company hereby submits a copy of Reportable Occur-rence No. USRE-Sl-76-06.

The substance of this report has been reviewed by the Station Nuclear Safety and Operating Committee and will be placed on the agenda for the next meeting of the System Nuclear Safety and Operating Committee.

Very truly yours, z/:. )/)f/ ~&iL-tZ*,~,;'a,,1

c. M. Stallings Vice President-Power Supply and Production Operations Enclosure cc: Mr. Robert w. Reid, Chief (40)

Operating Reactors Branch 4

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CONTROL BLOCK: ~ __.,_.....___.__.,___, -EASE PRINT ALL REQUIRED INFORMATION)

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LICENSEE LICENSE

• EVENT NAME LICENSE NUMBER TYPE TYPE

@ID 7 8 9 Iv IA Is I Pl sI 141! 15 Io Io 1-1 oI oI oI oI ol-1 o Io I I 41 1 I 1 I 25 26 30 lo31 I 323!

REPORT REPORT CATEGORY TYPE. SOURCE DOCKET NUMBER EVENT DATE REPORT DATE 7

@ElcoN'T 8

IM I 1 I 57 58 w w 59 60 lo lslol~!o!2l sl ol I ol sl o I s I 7 I 6 I !ol 61 68 69 74 75 sl 21411161 80 EVENT DESCRIPTION 10!2! I During the preparations to test the starting of #1 emergency diesel generator, water I 7 8 9 80

@EJ 7 8 9

!was observed dripping out of the air box drain. An immediate investigation* revealed 80 I

-~ I water had entered the air box from #1 cylinder via the cylinder air inlet ports. The I 7 8 9 BO

~ I piston in this cylinder was near the bottom of the stroke which opened the air intake J 7 8 9 80

@Thi I ports. The backup emergency diesel generator was tested satisfactorily prior (CONT'D) I 7 8 9 PR!ME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION 7

@0 jEj E!

8 9 10 w IE I N I GI I I Nj E I 11 12 17 w 43 44 I E 11 I 4 j 71 47

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48 CAUSE DESCRIPTION

&:@I, I EMD-GM Turbo Vee 20, 3810 Bhp diesel engine sustained a era.ck in #1 cylinder head J \ i t'

7 8 9 80 't

~ !which extended from an exhaust valve seat.approximately three-fourths of the distance I [1 7 8 9 80 IT@] I to the injector well and through to the water jacket. This is an area of high (CONT 1 Dj 7 8 9 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS U1,:)l.,OVt:HT DISCOVERY DESCRIPTION EID8 7 g uJ I 1 I o I oj12 10 13 N/A 44

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45 46

,___N-'-/A 80 FORM OF ACTIVITY CONTENT LOCATION 'OF RELEASE rn RELEASED OF RELEASE AMOUNT OF ACTIVITY 7 8 g

~ WI 10 11 N/A 44 45 N/A 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

[ill] Io I ol.Qj 7 B g 11 w12 13 N/A 80 PERS'DNNEL INJURIES NUMBER DESCRIPTION 12:0 lol olo 11I 7 8 9 12

~/A 80 OFFSITE CONSEQUENCES rreJ N/A 7 8 9 80 LOSS OR DAMAGE TO FACILITY

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TYPE 10 DESCRIPTION L!u_Ac;:_____________________________----='

80 PUBLICITY E08 7

N/A 80 9 i l.

ADDITIONAL FACTORS r E@J I The backup emergehcy diesel generator was demonstrated to be operable. In addition, I t.

7 8 9 80  !

the manufacturer's technical representative indicated that the #1 diesel engine would Cont' GE8 9 7 BO

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NAME: E

• M., Sweeney, Jr. PHONE: (804) 357-3184 .-

GPO 861*667 J

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,!,\*"'~EVENT DESCRIPTION (CON.D) to commenc:ement of repairs. The engine was repaired by replacing the cylinder head and associated components.

This is a reportable occurrence in accordance with Technical Specification 6.6.2b(2).

(USRE-S1-7 6-06)

CAUSE DE.§-9!],!'JION (CONTINUED) I

• I heat stress which most probably caused the crack. The crack permitted water from the water jacket to drip into the cylinder. The piston was near* the bottom of the stroke which uncovered the air inlet ports and allowed the water to enter the air box and thus exit the engine via the air box drains.

This is the se*cond cylinder head on this engine to be found with a crack and leaking wat.er in a time period of less than one month~ A thorough visual inspection after the last incident failed to detect this cracked head. Therefore, a more stringent inspection will be conducted to ensure no other cylinder heads on this engine are defective.

ADDITIONAL FACTORS (CONTINUED) have run and performe~ its intended function had it been necessary. Therefore,.

the safety systems would have functioned if they had been needed. Accordingly, no hazard to the safety or health of the general public existed.

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