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R z en n own.Vr uo r NI A 232G1 October 1, 1976 Mr. Norman C. Moseley, Director i Serial No. 266 Office of Inspection and Enforcement P0&f/ALH:jlf I!. 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.B.2, the Virginia Electric and Power Company hereby submits a copy of Licensee Event Report No. USRE-Sl-76-12.
l 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,
- iE
/5h/W C. M. Stallings Vice President-Power Supply and Production Operations Enclosure cc:
Mr. Robert W. Reid, Chief (40 copies)
Operating Reactors Branch 4 e
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8212290069 821130 PDR FOIA SCHLIS882-534 PDR v
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CONTROL DLOCK l l
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l (PLEAsE PRINT ALL REQUIRED INFORMATI N) 1 6
tcf NSEE 4 CI NSE L VI fif NAME LCENSE NUYDE A TYPE fvPC lVl Al SlP lS l1 l l 0 l 0 l-l 0l 0l0 l0 l0 !-l 0,l 0 l l 4l 1 l 1l 1l 0l l0 !1 l 01 7 89 14 15 25 26 30 31 32
' U OOCKET NUMBE A Evf N1 OATE ptPOut OA f f CATEGOAY TYP 01 COtrT b1_l d W lL l l 0 l S l 0 l-l 0 l 2l 8l 0l l0 l9 l0 ! 9 l 7l 6I l0 l9 l2 l7 l 7 l A l 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION OP l During steady state normal operation, a low pressure alarm eccurred on Safety Injec-Og 7 89 h l tion Accumulator "C". An immediate attempt was made to repressurize the affected accu-l 85 7 89
@ l mulator, but instead an unexpected pressure reduction occurred which caused pressure l
8e 7 89
@ l to fall from 605 psig to 540 psig in approximately five minutes. The reduction of l
8.5 7 89 l Safety Injection Accumulator "C" pressure to less than 600 psig is contrary to (Con't>]
06 82 7 89 pnMr SYS7 I CAUSE COMPONENT COMPONENT cot CODE COMPON5NT CODE SUPPL G MANUFACTUAEA votAicN h lSl Fl W lV l A l LI V!E lX l W
lCl6l3l5l d
7 89 10 12 17 43 44 47 48 CAUSE DESCR PTION l Partially open HCV 1936 caused nitrogen to pass through safety injection line (1"-SI-l 0
8g 7 89
@ l 105-152), pressurizer relief tank vent gas line (3/4"-VG-17-152) and HCV 1549 where a l Oc 7 89 (IJOl l body to bonnet leak existed. Therefore any attempt to pressuriz'e Safety Injection (Coni eO 7 89 METHOO Or F ACIUTY STATUS
% POWER OTHER STATUS OISCOVERY DISCOVERY OESCAiPiscN 11 lE l l1l 0l 0l l N/A l W l Containment Entry l
7 8 9
10 12 13 44 45 46 60 ACT TV CONTENT AMOUNT OF ACTMTY LOCATON OF RELE ASE I
OF AELEASE l N/A l
l N/A RELEASEO W
j 12 7 8 9
10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCApflON l
13 101010l Izl l N/A BC 7 89 11 12 13 PERSONNEL INJUA:ES l
NUMOEA DE 0C A PflON 1010l01 l N/A 14 89 7 89 11 12 OFFSITE CONSEOUENCES l
DE I N/A 60 7 89 LOSS OR OAMAGE TO FACILITY 3[
\\ N/A
)
iVPE Ot SCn Pron 8%
7 89 10 PUDLICIT Y l
l N/A 1
EL 7 89 AOOITIONhl FACTORS 3 lNo conditions of Health and Safety to the neneral public were affected.
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7 89 (804) 357-3184_
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T. L. Baucom paont:
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.,. s EVENT DESQRIPT10N (CONT *'" LED)
Technical Specification 3.3. A.2 and is reportable per Technical Specification 6.6.2.b.
A containment entry was made to determine the,cause of the loss in pressure.
It was discovered that HCV 1936 had failed about 50*? open, and that ilCV 1898 and 1549 had body to bonnet leaks.
It is further noteworthy that HCV 1936 indicated shut during this event.
A second containment entry was made to shut HCV 1936 and to tighten the body to bonnet bolts on HCV 1898 and 1549.
At this point the time. limit in Technical Specification 3.3.B.1 was exceeded and a power rampdown to hot shutdown was begun.
Shortly thereafter, the repairs on HCV 1736, 1898 and 1549 were completed, the accumulator was repressurized and the plant was returned to power (USRE-S1-76-12).
CAUSE DESCRIPTION (CONTINUED)
Accumulator "C" caused nitrogen to exhaust to containment through the body to bonnet leak on HCV 1549.
The body to bonnet leak previously mentioned on HCV 1898 contributed to overall nitrogen leakage.
Maintenance reports have been submitted to repair HCV 1936,1898 and 1549 at the next cold shutdown.
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YircininFlectrieandPcserCompany Ioc;.et :Io.
50-230 Curry 1.* nit 1 Licence i;o.
DPR-32 LICE!*SEE INE:IT REPORT.'ICC:
LER-260/'
76-14 1
DIS"' BIB'v"2IO!I:
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Don Lanham, AD:(
cc lith Enclosures 3ecion II Dochet Files 280 Eerion II Inspector with enclosures
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11/17/76 eu~.-*
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Tone MC 518 (Rev. 9-SS) AECSI 0240 W u, e, sovsamusht paserine orrscsa sere.eaa-ese. -..
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