ML18139B180

LER 81-020/03L-0:on 810223,during Full power,RM-CC-106 Alert & High Alarm Lights Energized W/O Initiating Required Automatic Action.Caused by Failed Card in Alarm Circuit.Card Replaced & Tested

ML18139B180
Person / Time
Site:	Surry
Issue date:	03/16/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B179	List: ML18139B178 ML18139B180
References
LER-81-020-03L, LER-81-20-3L, NUDOCS 8103190654
Download: ML18139B180 (2)

Text

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• LICENSEE EVENT REPORT

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VENT OESCRIPTlON ANO PROBASL.E CONSEQUENCES.@) _

!]:DJ jWith Unit Uo. 2 at 100% power,. the RM-CC-106 "Alert" and "high" alarm lights energized I

~ !without initiating the required automatic action *. This is contrary to T.S. 3-1, Table I_

C[I~:L13**7..;.5 and is: reportable per T.S. 6.6.2.b(4)*. Since the CC He~d-Tank Vent* is also

((IIJ rmonitored by the Process Vent System radiation. monito.r

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C§J1J !immediately closed, the health and safety of the public were not affected. I ______

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ATTACHMENT- 1 SURRY' POWER STATION, UNIT 2 DOCKET NO: 50-281

_REPORT NO: 81-020/03L-O -

EVENT DATE: 02-23 ----- *----**-------- -- - --~- -***- --

TITLE.OF EVENT: RADIATION MONITOR (RM.:..cc.:..106). MALEUNC.TI.ON___ __~---- ---- - --------------------

1. DESCRIPTION OF EVENT:

With Unit No. 2

• at 100% power, an operator-=:-ohserved~the_:_~_CC-1.06 -~~aler..t!!.".and...~-~---

"high" alarm lights on. The automatic closure.of HCV-CC-100 (CC Head Tank Vent) and the* associated annunciator had not.._func.t.ioned *..This_+/-s_c.o.nt.raryc_*- - - - - -

to Tech. Spec. 3 *.7-~ Table 3. 7-5 and is- rep_g:r~able per Tech. Spec. 6.6.2.b(4) *

2. PROBABLE CONSEQUENCES and STATUS of REDUNDANT EQUIPMENT:

The CC Head Tank vents. to the Process Vent*System. The process vent system has it's own radiation monitor and if the high alarm- setpoint-is..: exceeded-, ---

effluent releases are automatically terminated. Since CC Head .Tank Vent is monitored by the Process Vent System and the, .operator -:i.mmediately closed the CC Head Tank Vent Valve, the health and safety of the public- were not-a-ffected-.-.-

3. CAUSE:

The cause was. due to a failed card in thealarm:circuit.

4. IMMEDIATE* CORRECTIVE ACTION:*

The immediate action' was. to close the CC HeacLTank Vent Valve as specified in:

AP-5 ~- 5. ------------*------- **-***""---- --------~ * *------------

5. SUBSEQUENT CORRECTIVE ACTION:

The failed card was replaced with a new card-.----The-'-a-lai:lll**-c--irctt-:H:--and--*-associated-------

functions::were tested' satisfactorily.* The ..radiation monitor was returned to an operabl*e status within.26 minutes. - ----- - --~--- * - - - - - - - - - - - -

6. ACTION TAKEN TO PREVENT RECURRENCE: .

~one, deemed necessary *.

7. GENERIC IMPLICATIONS:

None.

""'* .... *-*---------