ML18139B075

LER 81-006/03L-0:on 810114,at Full Power,C Safety Injection Accumulator Found to Have Boron Concentration of 1943 Ppm, 7 Ppm Below Required Limit.Caused by Leakage Through Check Valve 1-SI-144.Valve Isolated

ML18139B075
Person / Time
Site:	Surry
Issue date:	02/13/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B074	List: ML18139B073 ML18139B075 ML18139B076
References
LER-81-006-03L-02, LER-81-6-3L-2, NUDOCS 8102200529
Download: ML18139B075 (2)

Text

NRC"FORM 366 17-77) e LICENSEE EVENT REPORT U. -CLSAR REGULATORY COMMISSJCN CONTROL. BLOCK: j.

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(]ID I boron concentration of 1943 ppm, 7 ppm below. the required limit of* 1950 ppm. This

[]JI] I is contrary to T.S.-3.3.A.2 and is reportable per T.S .. -6.6.2.b(2). *since "C" I CI:I!] I accumulator boron concentration was increased above 1950 ppm ~hfn*t1re--zr- hr. 1

((El I Tech. Spec. limitation (-55 min.), the health and safety of the public were not IIIIJ I affected. I,.

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COOE SUBCODE COMPONENT CODE SUBCODE SUSCODE CITl]

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12 13 18 19 :ZD SEQUENTIAL OCCUR REN~ REPORT REVISION.

t:':;\ LE R/RO *cVENT VEAR REPORT NO. CODE TYPE NO.

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.CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS*@

_ o:I.]J JThe cause of the reduced concentration was leakage through check valve l-SI-144.

[IJJJ !The corrective action was .to isolate this valve with future plans to repair the

.o::u:J 1valve during an outage of sufficien~. duration.,. -I OJI]

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ACTIVITY RELEASED OF RELEASE CONTENT AMOUNT OF ACTIVITY ~ .. _LOCATION OF R.ELEASE .

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e ATTACHMENT I SURRY *POWER STATION, UNIT 2 DOCKET NO: 50-281

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* -- - - - REPORT-NO:-.----. 81-006/03L-O EVENT DATE: 01-14-81

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~---

TITLE of EVENT: SI'ACCUMULATOR LOW BORON CONCENTRATION

1. EVENT DESCRIPTION:

With the unit* at full power, it was determined through sampling that,'.

---

***-the *bor6n-*concentratici1f of **".c" Safety Injection Accumulatc>'i~ was a:t T9tcr""ppm___ *-*- * - - *

' which .is below the 1950 ppm.required by Tech. Spec. *This.is contrary to

---**** * ** *-*Technical -Specif*icatio1f3-;3:-A.2 and is reportable per T.s*.-6~-6~2~b'(2r.*--* --- ------------ --

2. PROBABLE CONSEQUENCES:

• • --*---*-***-*-------------The *:rediiiidant**safe-t:y--Irijection accumulators~ 'A' & 'B', *were-veril{iif*-~-----* *--------*-

to be above the minimum concentration (2093 & 2098 respectively). * "C" *

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... *------..--- --- ~SI-*ACCiim.Ula*t*,:;-r-was*-*ret*Urned~to an operable status; C gt"eiter -t:-itaii-i~f50--ppm-;- ----------**-

within the 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Tech. Spec. limitation (55 minutes,. Therefore, the health

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.. _ and safety of the public were not affected. -~ ----~- _

3. CAUSE:

There are several manual valves inside -containment which must be *open*in order to perform the month.1-y flushing of sensitized stainless steel pipe. In order that the number of containment entries could be kept to _:a minimum, thf!J~e manual valves had been *left-open. With manual valves 2-SI-249 and 2-SI_-256 left open, charging system pressure existed on the down~tr_eam side of check valve l-SI-144 which leaked througj:i, thereby diluting "C" accumulator.

4. IMMEDIATE CORRECTIVE ACTION:

__ .. ____ .. The illlmediate corrective action was to recirc. the accumulator"with- -the, -

RWST to bring the boron concentration within specification.

. -*- .. .:._ -----*------.---* ~----*---*- - ---* -*-

5. SUBSEQUENT CORRECTIVE: ~ACTION:

---*-***-- ---------- --*- *--*- ------*~. **--- --*--- _,,. _________ _

The subsequent corrective action was. to close the manuai valves ,in.

containment.

6. FUTURE CORRECTIVE ACTION:

• • • • --- - - - ---- *---- , *** Check-valve 1-SW-144---i;s- scheduled to be repaired during *the next-*outag-e---- - -**** -**-*

• of sufficient duration.

-*---*---- '] .----GENERIC IMPLI-CATI6N:- ,_, --*--

None.