ML19095A604

Submit Licensee Event Report No. USRE-S1-76-10 Re Detection of Water in No. 7 Cylinder

ML19095A604
Person / Time
Site:	Surry
Issue date:	08/04/1976
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/RGN-II
References
Serial No. 173 LER 1976-010-00
Download: ML19095A604 (4)

Text

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VIRGINIA ELECTRIC .A.ND PowER COMP.A.NY RICHMOND, VIRGINIA 23261 August 4, 1976 Mr. Norman c. Moseley, Director Serial No. 173 Office of Inspection and Enforcement PO&J!J./ALH:jlf

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 Licensee Event Report No. USRE-Sl-76-10.

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,

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

Operating Reactors Branch 4

~ ..

• LICENSEE EVENT -REPORT*

USRE-Sl-76-10 CONTROL BLOCK: I I 1* I I 1* I [PLEASE PRINT ALL REBUIRED INFORMATION)

. 1 6

_.LICENSEE. LICENSE EVENT NAME

• LICENSE NUMBER . TYPE TYPE 7

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. _30 31 32 .

• . ~ :.

REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE RE;P08T DATE 7

@E]coN'T 8

IM I I I 57 58 w 59 L1J 60 lo 61 Is Io 1-1 o 12 I s I o 68 I I69ol. 1!21311161 74 101 s*1 75 ol 211161 80 EVENT DESCRIPTION

@:§. I During the preparations to test the starting of #1 emergency diesel generator (EDG),

7 8_ 9 80 joj3j Lwater was detected in #7 cylindero The backup emergency diesel generator was irinnediated 7 8 9 80 rn 7 Ei 9 I ly tested satisfactorily and the repairs commenced on #1 EDG., The engine was x-'epaired 80 I

@:@] lby replac.ing the cylinder head and head gasketo This is a reportable occurrence in I 7 8 9 I 80

@I§] I accordance with Technical Specification 6o6o2b (2)a (USRE-S1= 76-10) J 7 8 9

• PRIME BO SYSTEM CAUSE .COMPONEhlT COMPONENT CODE CODE COMPONENT CODE SUPPLIE11 MANUFACTURER VIOLATION

• @0 7 8 9 IELEI 10 lli.-1 11 IE I N I G I I I N l 12 E!

17 w43 IE I I 14 l 747 44 LR1 48 CAUSE DESCRIPTIOl\l I

@:lfil IEMD-GM Turbo Vee 20, 3810 Bhp diesei engine sustained a crack in #7 cylinder head whi~

7 .8 9 80

~ ~xtended between two exhaust valve seats and through the water jacket. Thus water from J 7 8 9 80 floJ I the_ cylinder he:-:id water jacket was p e!.1:fli_t t ed to d_!-'__i_p_i_n_L_-o_t_l_1e_c_*y_*l_1._*nde r. (Cont: i nu ~.L_J nn 7 8 9 UV FACILITY METHOD OF STATUS  % POWEfl OTHER STATUS DISCOVERY DISCOVERY DESCRl?TION

• EEi 7 8 9 w IO 10 I 5 l_gj 12 13 L---=<N/......._A_ _ _J 44 LBJ 45 46 NIA 80 FORM OF ACTIVITY CONTENT LOCATION OF RELEASE rn w RELEASED OF RELEASE AMOUNT OF ACTiViTY

~Jl~~N~/A'--~~~~-'44 1.-..!.N:..t../=A_ _ _ _ _ _ _ _ _ _ _ _ _ j 7 8 9 10 11 45 80 PERSONNEL EXPOSURES NUMBER TYPE DE:SCRIPTION 7

~ l_2.._I o I 8 9 .

0111 w12 13 N/A 80 PERSONNEL INJURIES NUMBER DESCRIPTION EE] lololoj N/A 7 8 9 11 12 80 OFFSITE CONSEQUENCES

.[ilij I N/A 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION J 7

IIlfilW 8 9

~1-~N/~AL'--~-------------------------;80 10 PUBLICITY

[1_]z}8 7

1--_~N:.!.!*/~A~--------------------------------*-_j 9 80 ADDITIONAL FACTORS r 7

[i}fil 8 9 l The backup emergency diesel generator was demonst..x:_aJ;;_g_g,_!:.Q_j~xtl~-J:~

80 D]J Lsafety systems would. have functioned if they had been required. (Continu_ggl______ _J 7 8 9 . OD NAME: _ _ ];. L. Baucom PHONE:

GPO O 61 - 6 6 7

,I CAUSE DESCRIPTION (CONTINUED)

Inspection .of the engine prior to starting permitted detection of the water and prevented further damage to the engine.

This is the sixth cylinder head on this engine to be found with a*crack, in a*

time frame of just over three months. USRE Sl-76-07 listed the other incidents and indicated the probable cause as either a cylinder heat imbalance or a heat stress as a result of an engine overheat condition at some previous time.

The location of #7 head on the engine does not conform to the previous pattern and tends to eliminate a cylinder heat imbalance as the probable cause. It appears that a previous engine overheat condition has heat stressed the cylinder heads to such a point that premature metal fatigue from vibration is causing the cracks to appea~ between the exhaust valve seats. This is an area of high heat and vibration stress *.

To ensure the reliability of this engine, the weekly testing of this engine as outlined in USRE Sl-76-07 will continue. New cylinder heads have been ordered and total replacement should preclude any additional failure. This course of*action has been thoroughly discussed with the manufacturer's representative who concurs with this procedure.

P..pQI1].QNAL FAQ1:G_;~ (CONTTNUED)

Accordingly~ no hazard to the safety or health of the general public exist~d.

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