05000281/LER-1981-006-03, /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

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/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:
References
LER-81-006-03L-02, LER-81-6-3L-2, NUDOCS 8102200529
Download: ML18139B075 (2)
v • d • e


LER-1981-006, /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
Event date:
Report date:
2811981006R03 - NRC Website
v • d • e

text

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

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION!

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LICENSEE CODE 14 15 LICENSE NUMBER

ZS 26 LICENSE TYPE JO 57 CAT 58
~~~~ l1..J©lo Is lo lo !o !2 Is 11 101 a Ii I 1 !4 ! B ! l 1©1° 12 11 13 IB 11 I© 60

. 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT CATE 80 EVENT OESCr!IPT!ON AND PROBABLE CONSEQUENCES@

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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" CI:I!] I accumulator boron concentration was increased above 1950 ppm ~hfn*t1re--zr-hr.

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

((I[]

7 8 9 SYSTEM

CAUSE

CAUSE COMP.

. VALVE COOE cooe.

SUBCODE COMPONENT CODE SUBCODE SUSCODE 1s1F 1@ L.!J@ L!.J@ 1v1A1L 1v1E1x1e w@ w@ -*

9 10 11 12 13 18 19

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7 8

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CODE TYPE

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NO.

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ATTACHMENT

. NPRD-4 PRIME C:OMP, TAKEN ACTION ON Pl.ANT METHOD HOURS ~

. SUBMITTED

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  • SU""LIER MANUFACTURER L!J@lE..J@ L!.J LLI l O ! 0 I Of Of ILJ@. LllJ@)

IN I 3:1 34 35 36 37 40 41

  • 2

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!R ! 3 ! 4 14 J@)

.CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS*@

44 47

_ 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.,.

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FACILITY

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. STATUS *

% POWER

. OTHER STATUS \\;:::I tilIJ L!J@ I 1 j O I 01@1 N/A I

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RELEASED OF RELEASE AMOUNT OF ACTIVITY ~

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10 11 METHOD OF

  • DISCOVERY DESCR;PTION @

DISCOVERY WI SamEling 45 46 I

.. _LOCATION OF R.ELEASE.

!ilA 45 FIERSONNEL EXPOSURES t.:::\\

NUMBER A

TYPE

DESCRIPTION

!III] ! 0 ! 0 ! 0,~L!..Ji__ ___.:.;.N:..:/A=--------------------

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NUMBER

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68 69.

l:""'~~!::(804) 357-3184

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80 J

80 80 80 1!0

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l:

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 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

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

-~

~-

3.
4.

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.

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.

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