05000368/LER-1982-043-03, /03L-0:on 821205,core Operating Limit Supervisory Sys (COLSS) Power Operating Limit Alarm Received.Caused by Procedural Error in That Proper Penalty Factor for Test Configuration Not Required to Be Inserted Into COLSS

/03L-0:on 821205,core Operating Limit Supervisory Sys (COLSS) Power Operating Limit Alarm Received.Caused by Procedural Error in That Proper Penalty Factor for Test Configuration Not Required to Be Inserted Into COLSS

ML20028C809
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/04/1983
From:	Rogers P ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20028C804	List: 05000368/LER-1982-043, Forwards LER 82-043/03L-0 05000368/LER-1982-043-03, /03L-0:on 821205,core Operating Limit Supervisory Sys (COLSS) Power Operating Limit Alarm Received.Caused by Procedural Error in That Proper Penalty Factor for Test Configuration Not Required to Be Inserted Into COLSS
References
LER-82-043-03L, LER-82-43-3L, NUDOCS 8301140157
Download: ML20028C809 (2)

LER-1982-043, /03L-0:on 821205,core Operating Limit Supervisory Sys (COLSS) Power Operating Limit Alarm Received.Caused by Procedural Error in That Proper Penalty Factor for Test Configuration Not Required to Be Inserted Into COLSS

Event date:
Report date:
3681982043R03 - NRC Website

text

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.e NRC FORM 366 U.S. NUCLEAR REGULATORY COP 911SS10N (7-77)

LICENSEE EVENT REPORT EXHIBIT A CONTROL 8 LOCK: l_l_l_l_l_l_l1

-(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

h UMB 8

5 2 E

$77AT38 P '11

"!u'M !P' !F1'4M'4!ri ' ' 'M' ! Pia'Al " 'M' !FM&!4?FM' S

EVENT DESCRIPTION AND PR08A8LY CONSEQUENCES 10 l1l1l lOn 12/5/82 while performina the reactivity coefficients at power test procedure at 50% full power, the core l

11111 loperatino limit supervisory system (COLSS) power operating limit (POL) alarm was received. The center control l l1l1l lelement assembly (CEA). CEA 6-1, was being inserted as reautred by the test procedure. When CEA 6-1 exceeded l l111l lthe deviation from aroup limit, a CEA deviation penalty was applied to the COLSS DNBR and LPD calculations.

l 11l1l lThis reduced the POL from approximately 120% to approximately 45% which was less than the actual calorimetric l l1l1l l power of 50%. Consultation with Comoustion Enaineerino revealed that the penalty factor in COLSS at the time l l1l1l lof the occurrence was overly conservative for the testina CEA configuration. Xenon redistribution (continued) l 7

8 9 80 SYSTEM

CAUSE

CAUSE COMP VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SU8 CODE 111 il 11 l12 113 l_N_l1l1l_R_l 14 115 l16 SEQUENTIAL JCCURRENCE REPORT REVISION LER/R0 l_ EVENT YEAR REPORT NO.

CODE TYPE NO R

l_

2 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB SUPPLIER MANUFACTURER l18 119 l20 l21 0_l_0_,l_0_l 22 123 124 125 l11_9_l 26 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 l1l1l lThe cause of the occurrence was a procedural error in that the proper penalty factor for the test configura-l l1l1l l tion was not required to be inserted into COLS$ and that the procedure did not require close supervision of l

l1l1l lthe COLSS limits. CEA 6-1 was immediately returned to Group 6 heicht and testino was halted upon verification l l1l1l lof the cause of the alarm. Combustion Engineerina was consulted to obtain the correct penalty factor for the l l1l1l l testing configuration. Upon receiving the correct penalty factor, the procedure was revised to (continued) l 7

8 9 80 FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION l1l1l l_E_l28 lIl_$_l~~0 129 l0 l Physics Testina 130 l A 131 l Test Personnel Observation 132 I2 13 44 4I 46 80 7

8 9 ACTIVITY CONTENT l

RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1111l l,l IZ l

NA 135 l NA 136 9 _l33 l I l34 7

8 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

l1111 9 _l_0_l 7 10 l37 l I l38 l l_0 2

NA 139 7

8 I

13 80 PER$GNNEL INJURIES NUMBER

DESCRIPTION

11111 9 _l_0_l~0 140 l

1. 0, NA 141 "Il 12 80 7

8 LOSS OF OR DAMAGE TO FACILITY TYPE

DESCRIPTION

8301140157 830104 lIlll l_L.l42 l NA PDR ADOCK 05000368 143 S

PDR PUBLICITV ISSUED DESCRIPTION NRC USE ONLY 11l11 l_N_l44 l NA 145 63 _l_l_l_l_l_l_l_ _l_l30 ll l

1 7

8 9 10 68 NAME OF PREPARER Patrick Rocers PHONE: (501) 964-3100

~&

g Page 2 sf 2 LER No. 50-360/82-043/03L-0 Event Description and Probable Consequences (Continued):

effects for the center CEA are negifgtble compared to the peripheral rods within Group 6; therefore, since the penalty factor in COL 55 was based on the peripheral CEA misalignment, the COL 55 calculations were overly conservative. If the correct penalty factor had ten inserted for the test configuration, the COLSS POL would not have been exceeded. Although the COL 55 alarm was received during the test, the actual margin for the conditions of the test remained satisfactory. This event is reportable per Technical Specification 6.9.1.9.b.

There have been no siellar LER's.

Cause Description and Corrective Actions (Continued):

allow for reduction of the overly conservative penalty factor. After completion of testing, the original penalty factor was reinstalled.