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

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_ 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

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

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

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" *

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

within the 4 hour Tech. Spec. limitation (55 minutes,. Therefore, the health

---

.. _ 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:- ,_, --*--

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