05000280/LER-1980-015-03, During Radiation Monitoring Test,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Instrument Drift.Activity Levels Verified

During Radiation Monitoring Test,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Instrument Drift.Activity Levels Verified

ML18139B297
Person / Time
Site:	Surry
Issue date:	05/04/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B295	List: 05000280/LER-1980-015-03, During Radiation Monitoring Test,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Instrument Drift.Activity Levels Verified 05000280/LER-1980-028-03, W/Unit at 100% Power, Reduction in Svc Water Pressure to Charging Pump Experienced.Caused by Missing Valve Disk for 2-SW-113.Check Valve Replaced 05000280/LER-1981-004-03, Radiation Monitoring Recorder (RR-175) Found to Be Printing Erratically.Caused by Loose Gear on Balance Motor,Allowing Drive Cable to Slip.Set Screw on Drive Gear Tightened ML18139B294
References
LER-80-015-03X, LER-80-15-3X, NUDOCS 8105080272
Download: ML18139B297 (2)

LER-1980-015, During Radiation Monitoring Test,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Instrument Drift.Activity Levels Verified

Event date:
Report date:
2801980015R03 - NRC Website

text

I

- J;,ll~C::-FO~M 366, ~~-..

• t?-771 "UPDATED REPORT-PREVIOUS ICENSEE EVENT RE?ORT

+

REPORT DATED 02-14-8,0" CONTROL BL.CCK: I. l

~ J I

10 IPL.EASE PRINT OR TYPE A.L.L. REQUIRED INFORMATION) 1 6

~

L£lil IV I A I s' p I s j l l(DI O I 01 -, 0' 01 *01 Ol 01 -I 010 l(Dl 4 11 'l 1111101 I I© S

9 LICENSE: co:>E

• ts LICENSE NUMBER 2S.

25 LICENSE TYPE ;io 57 CAT SS CON'j [IE]

5

~;~~~; LI© L.21 5 l O I O I O I 21 B I O 101 0 l 2 11 ! 8 \\fl' I O I© I O I 51 0 I 4 1 8 I 11 © 60 51 DOCKET NUMBER 6B 69 EVENT CATE 7S REPORT 0..:., E BO

V!:Ni' O!:SC:RIPiJON ANO PR06ABL.: CONSEQUENCES@)

I During the performance of PT-26.1, Radiation Monitoring Equipment Test, with the unit at 100% power, the Radiation Alarm Setpoint for the Component Cooling System t[Il]

((TI]

((TI]

cm]

[§JI]

was found to be greater than twice background* as listed in T~ch. Spec. 3. 7, Table :;.

• I 3.. 7-5 (6. 4 x 104 CPM _vs. 6. 0 x 10 4 CPM).

• Operating.in this condition, the

• Component Cooling Syst.em' s surge tank vent valve would not have automatically closed at. twice background.

This event is reportable* in accordance with Tech. Spec.

[))II I 6.-6

• 2

• b

• C 4)

• 7 B B SYSTSM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT'CODE

• SUBCODE

• SUBCODE

,M1c 1@ l!J@ w@ 1r 1N1s1T 1 R 1u 1e w@ L!.J@

9 10 11 t:Z 13

,s 19 20 [ill]

7 B

SEQUENTIAL OCCURRENCE REPORT REVISION

/.,':;\\

LE RIRO LVENT YEAR REPORT NO.

COOE

'TYPE NO.

\\.:.:,J REPORT ! 8 I O l I * !

! 0 I l i s I J.........,

I O J 3 !

l.Ll l..;__I W

NUMBEJ:I.

21

%2 23 24

• 26

Z7 2S 29

~

31 32 AC"MON FUTURE 1:FF1:CT

• SHUTDOWN t.:::\\

ATTACHMENT

. NftR~

PRIME COMP.

COMPONEN'T I

SD

'TAKEN

,ACTION ONPL.ANT METHOD HOURS \\:31 SUBMITTED FORM!>UB.

.SUl"PUER MANUFACTURER W@W@) l.!.J@ W

!, 0 Io I *0 I O I L.!J@).* L!l@t ;:LI@ **;_1v111 1 1 s 1@

-~

~

3S 36 37 40

,41

• ~

• '3

• 44

,47 CAUSE DESCAIPilON AND COAAECTIVE ACTIONS @.

[II[] I The improper setpoint was attributed *to instrument drift.

The activity levels in the ]

IJJJJ CC system were verified to be within allowable limits and the monitor, RM-CC-105 cr:IiJ was recaliqrated.

Since the activity levels were within *allowable limits, the CIII]

health and safety of the*public were not affected.

lJE 7

S 9

FACILITY

'30' Me,,,,IOD OF t:;:;,.,

SC STATUS

% l"OWE!'I OTHER STATUS V:::,,

• DISCOVERY DISCOVERY DESCl'ltPTION ~

!TII] LIJ@* !1 !o IO J@I N/A I l.!.J@lr... __;;R;;:;,;ou;;;.:t;.:in;.;.;e;_;,Te.;;.;* s;;..;:t;.;.*---* _. _____

7 S

9 10 12 1'l 44 45

• 46 ACTIVITY CONTENT

~

REL:ASEO OF RELEASE AMOUNT OF ACTIVITY ~

ITEi LzJ@) W@)I

. NIA a s 10 NIA

• -~~CATION OF RELiASE @

80 I

80 PERSONNEL EXPOSURES Q.

NUMBER

~

TYftE ~

OESCRIPTION ~

[ITIJ ) 0 IO ! 0 lL.Ll~'-----.....:.N;.:.f.;,;.A ___________________ ---'

a s 12 1:.

ftERS0NNEL INJURIES

~

Ill UMBER OESCRl,,-ION~

DI] I al o I ol@r...* ______..:;N.A~--------------------'

a s 11 1:z

• so so LOSS OF OR OAMAGE TO FACILITY '43'-

TVPE

DESCRIPTION

~

[ill] llJ@)

NA -

a 9

,o

.SD PUBLICITY

• t:;-.,

ISSUED~ DESCRIPTION~

I1TIJ ULJe, N

I I I l l I I I I l *1 l I NFIC USE ONLY 7

S 9

10 68 69 80 NAME or: DCl=P~R'"""i:: J. L. Wilson D... ONE: (804) 357-3184 41.. !

~

S 10508U L]rz__

.,..~~""?";;*, -.-.*. *.**. __ ~,, *** -,...-.. _ *,,.:,, *-:.r.... ~*-?:::f-=.~---.- _..,.. ---~-~'.-:-_-___.,.., *""'". *:...""-*""*~""-.'"".,.,.

..t*-,,-""y'"'*_.""-::-""-,:-"'.,;.""'-,,,,.;t_*.,..,,""'

...... -~-~""i"""~"',...,,""."'"-""_,~.,.,>*.""'.-~""-_-'"'-..... _....

~.""'-,.......

__ *;.,_.*:**,...-.:.~:.:._.-.... -_,!.-,..-1:-,;-._-__ -..;.,*;-.:_~---::-*,.. -.:.-::-.. -... *""'~~i::7~

,--.;-~-'-**,

, -~""-..-.-:.* n *,_!*:*~*'**.-'.~_ *. _ *.,r:o,:,,._r__:_:_::.r,:._,,,.... :.*-~-~--"::'--:**-

.~ _

~-.*,*:,> -:-..

• -:--.~.:;~:.. -*c-.,~~- --:.:**-~....... *.~"-.'"--.-<*-=-.:,... *,~**-... ~ :-*"*C:.::**-~~-";;~*-:~~~---~--:---*.-:-~-~~--

e e

UPDATED REPORT-PREVIOUS REPORT DATED 3-14-80 A'ITACHMENT, PAGE 1 OF 1 SURRY POWER STATION, UNIT 1 DOCKET NO:

50-280 REPORT NO:

80-015/03X-1 EVENT DATE:

2-17-80 TITLE OF EVENT:

RADIATION MONITOR (RM-'CC-106) SETPOTNT: ABOVE ESTABLISHED LIMIT

1.

DESCRIPTION OF EVENT

During the performance of PT-26.1, Radiation Monitoring Equipment Test, with the Unit at 100% power, the Radiation Alarm Setpoint*for the Component Cooling Sys tern was found to be greater than twice li-ackground as* listed in Tech. Spec.

3.7, Table 3.7-5 (6.4 x 10 4 CPM vs.6.0 x 10 4 CPM).

Operating in this condition, the Component Cooling System's* surge tank vent valve would not have automatically closed at twice background.

This event is reportable in accordance with Tech. Spec. 6.6.2.b.(4).

2.

PROBABLE CONSEQUENCES AND STATUS OF *REDUNDANT* SYSTEMS:

Upon discovery of the improper setpoint, the activity levels were checked, and verified to be within, allowable setpoints.

. the automatic operation of the-surge tank vent valve was not health and safety of the public were not affected,

3.

CAUSE

The improper setpoint was attributed to instrument drift.

4.

IMMEDIATE CORRECTIVE ACTION

in the CC system Consequently, required and the Activity levels in the CC system were verified to be within allowable limits and a maintenance* report initiated to recalibrate the monitor.

5.

SCHEDULED CORRECTIVE ACTION:

The monitor, RM-CC-106, was recalibrated to the proper setpoint,

6.

ACTION TAKEN TO PREVENT RE CURRENCE:

None required,

7.

GENERIC IMPLICATIONS:

This was considered a random event and poss*esses no generic implications,