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:	WILSON J L 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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• 68 S9 EVENT CATE 74 REPORT CATE 80 ::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

• and the vent va:lve was C§J1J !immediately closed, the health and safety of the public were not affected.

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• circuit.

The card was replaced, the *t OJI]-I new card and associated functions were tested. The monitor was returned to an. C!Jil I nperable status within. ~6 minutes. I C!lil. i..... ...... ----------------------- ...... --...... ------------ C!ID 7 8' 9 so: FACILITY . ~30. M£1MOD OF STATUS % JIOWEJII, . OTHER STATUS v::::/ -OISCOV!A'I' . -OISC°'1EAY DESCRIIITION '51 1TJilJLl.@. J 1 J O I O !@)I N/ A -W@ ... I _o.;;.pe_r_a_to_r_ob_s_e_rv_a_t_i_on ___________ I__." ___ _ 7 . s-9 10 12 1'! 44-41* -4 so . ACTIVITY' CQNT!NT -_ t.::\ r.r::,R!LEAS!~F RELEASE AMOUNT OF ACTIVITV ~. _ -. _u:)CATl<<;IN OP: "iLIASE L.:...L:J 1LJ ~-WI N/A I I N/A , a g-10 11 44

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.:.*~.ry,u,r".;:.f(:.': _____ *_._:,::.; ,,5.,.-!:;,.,~~ .. **,a-*-,0 ATTACHMENT-1 SURRY' POWER STATION, UNIT 2 DOCKET NO: 50-281 _ REPORT NO: 81-020/03L-O -EVENT DATE: 02-23-81 ------*----**--------

---

~--***---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. ------------*-------

• • -***""----

---

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• • *------------

5. SUBSEQUENT CORRECTIVE ACTION: The failed card was replaced with a new 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. ----------- ""'* .... *-*---------}}